Antenna Seatel Series 94 Troubleshooting Guide

Series 94 Troubleshooting Guide

Document No

March 2001

119292-0 Marine Stabilized Antenna Systems

Introduction

I


Introduction

This troubleshooting guide is organized into 5 sections which are intended to help you operate, test and troubleshoot Series 94 Stabilized Antenna Systems. Should you find any errors, or have any suggestions, please call or fax your input to Sea Tel. Refer to the appropriate Quick Start Operation guide for your system for routine operation. When you need to isolate a problem, start with the Troubleshooting Procedures section. Many problems are actually found to be an incorrect operator setting or parameter, rather than a component failure. Follow the procedures through Initial Power-up Operation, to functional Testing and finally to Problem Scenarios or Troubleshooting Modules. If you have identified a specific failure, you may prefer to go directly to the appropriate Troubleshooting Module(s) to begin (refer to the Table of Contents). In using this troubleshooting guide you may be pointed from a procedure, test or problem to another section or to a troubleshooting module. You may also be directed from one troubleshooting module to another. The “action to take/step to go to” column contains several key words which are used to direct you. These are: (blank) go to the next step down re-check re-check this step before going on re-test re-test a specific step then proceed as directed by that step return return to the previous module step or procedure that pointed you to this section of steps REQUIRED EQUIPMENT The tools and equipment necessary to perform these tests are: a. Service Manual with Troubleshooting Guide b. Multimeter c. Basic Technicians tools d. Spare Parts Kit e. Bubble level (small) f. 9-Pin Loop-Back connector g. 15-Pin In-Line test-point connector CAUTIONS Equipment damage: a. Do NOT “hot plug” connections to the TAC-92C while power is ON. This will cause damage to the Aux Serial Ports (J11 & J13), Main PCB (any Antenna control connection) and PCU (any Antenna control connection). b. Aux Serial Ports (J11 & J13) have +24VDC output, when connecting a computer to these ports use Cable PN 116670. Electrical shock/personnel safety: a. AC voltage exists in the TAC-92C, exercise caution to prevent electrical shock. b. AC voltage from a Synchro Gyrocompass input to the TAC-92C is NOT turned OFF when the TAC-92C power is OFF. Exercise caution to prevent electrical shock.

Sea Tel Europe Unit 1 Orion Industrial Centre Wide Lane Swaythling Southhampton S018 2HJ Tel: +44 (0)23 80 671155 Fax: +44 (0)23 80 671166 e-mail: [email protected]

Sea Tel, Inc. 1035 Shary Court Concord, CA 94518 USA Tel: 925-798-7979 Fax: 925-798-7986 Toll Free: 1-888-798-7979 Email: [email protected]

http://www.seatel.com

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Table of Contents I II III

Introduction Quick Start Operation Troubleshooting Procedures 1

Basic system power-up and initial operation

3-1

1.1 1.2 1.3 1.4 1.5

3-1 3-1 3-1 3-1 3-1 3-1 3-2 3-2 3-2 3-2 3-3 3-3 3-3 3-4 3-4

1.6

1.7 2

3

1-1 2-1 3-1

Turn on the satellite receiver(s) Other Distribution Equipment Turn on the TV(s) WeSat Equipment Turn TAC-92C Power ON 1.5.1 Press RESET 1.5.2 Front Panel key checks 1.5.3 Press the SHIP 1.5.4 Press SAT 1.5.5 Verify that the TAC-92C parameters When the antenna has completed initializing 1.6.1 If the antenna acquires the desired satellite 1.6.2 If the antenna is not on the DESIRED satellite 1.6.3 If the antenna does not acquire any satellite Check for blockage

Functional Testing

3-4

2.1 2.2 2.3 2.4

TAC-92C Front Panel Test Azimuth Drive Test Elevation Drive Test Targeting Test 2.4.1 Test Targeting 2.4.2 Evaluate AZ & EL TRIM Values 2.5 AGC Signal Level Tests 2.6 Tracking Test 2.7 Heading Testing 2.7.1 Internal Fluxgate 2.7.2 External Fluxgate 2.7.3 Gyrocompass - NMEA Heading Output 2.7.4 Gyrocompass - Step-By-Step (SBS) Heading Output 2.7.5 Gyrocompass - Synchro Heading Output 2.8 Underway Testing 2.9 Initialization Test 2.10 Rate Sensor / Stabilization Test 2.11 Fluxgate Compensation Test

3-4 3-4 3-4 3-5 3-5 3-6 3-7 3-8 3-8 3-8 3-8 3-9 3-9 3-10 3-10 3-11 3-11 3-11

Symptom / Problem Scenarios

3-12

3.1 3.2 3.3 3.4

3-12 3-12 3-13 3-13 3-13 3-13 3-14 3-14 3-14

Antenna Drifts Off Satellite Channels Freeze Frame Constant Unwrap LED Heading Input Fault Isolation 3.4.1 Internal Fluxgate Fault Isolation 3.4.2 Ships Gyrocompass Fault Isolation - General 3.4.3 SBS Gyrocompass Output 3.4.4 Synchro Gyrocompass Output (36:1, 90:1 or 360:1) 3.4.5 Synchro Gyrocompass Output (1:1 ONLY)

Introduction


Table of Contents 3.5 3.6 3.7 IV

IF Distribution Problem Remote Not Responding TAC-92C Display Blank

Troubleshooting Modules ACC1.0 AZD1.0 AZR1.0 CLD1.0 CLR1.0 COMP1.0 ELD1.0 ELR1.0 ENC1.0 ERR1.0 ERR2.0 ERR3.0 ERR4.0 ERR5.0 ERR6.0 ERR7.0 ERR8.0 ERR9.0 FLUX1.0 HOME1.0 INIT1.0 LEV1.0 MINST1.0 ROM1.0 SIG1.0 SPOOL1.0 TAC1.0 TILT1.0 UNWRAP1.0 VIS1.0

V

3-15 3-15 3-15

Antenna Control Cable Azimuth Drive problems Azimuth Rate Sensor Cross Level Drive problems Cross Level Rate Sensor Remote Compensation failure Elevation Drive problems Elevation Rate Sensor Encoder failure Error Codes ERROR CODE 0001 – Gyro Read Error ERROR CODE 0002 – Wrong Synchro Converter Type ERROR CODE 0004 –Communications error ERROR CODE 0008 – Pedestal function error ERROR CODE 0016 – Conscan error ERROR CODE 0032 – Reserved for future use ERROR CODE 0064 – Reserved for future use ERROR CODE 0128 – Satellite Out Of Range Fluxgate Failure Home Sensor / Home Flag Antenna Initialization Level Cage Motor (Size 17 Stepper Motor) Mechanical Installation Range of Motion RF/IF Signal Distribution Spooler Cable TAC-92C Power Supply Tilt Sensor Unwrap LED is lit frequently or constantly Visual Inspection

4-1 4-4 4-9 4-12 4-17 4-21 4-22 4-27 4-31 4-33 4-34 4-41 4-44 4-47 4-48 4-55 4-56 4-57 4-58 4-59 4-61 4-64 4-69 4-71 4-72 4-74 4-78 4-82 4-85 4-86

Drawings Model 2094 Stabilized Pedestal Model 2494 Stabilized Pedestal Model 3294 Stabilized Pedestal Model 4094 Stabilized Pedestal Model 4894 Stabilized Pedestal Model 6094 Stabilized Pedestal Radomes for DBS Antenna Pedestals Model TAC-92C Tracking Antenna Controller

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5-1 5-1 5-1 5-2 5-2 5-3 5-3 5-3

Quick Start Operation for Series 94 DBS Systems Perform the following when the ship HAS NOT significantly changed geographic location or satellite selection, and the system has been turned OFF.

You enter information on the TAC 92 keyboard: 1. Turn Power “ON” Power switch is located in upper right corner of TAC-92 Rear panel. Turn on Television and Satellite receiver 2. If you have the TAC-92 interfaced to the ships’ GYRO, Press “SHIP” four times. (If not, Go To Step 4) 3. Key in the current ships Heading to the nearest degree, then press “ENTER”. Press “RESET”. 4. After Initialization

The TAC 92 will display: Display should read “REMOTE INITIALIZING” System will automatically go through an initialization sequence which takes approximately 2 minutes. Display should read “HDG xxx.x”

Display will change to read “REMOTE ...VER.X.XX”

When Initialization is complete the “SEARCHING” light (green) will flash and the “UNWRAP” light (red) may be ON. In approximately 30 seconds the “SEARCHING” and “UNWRAP” lights will extinguish and the “TRACKING” light (green) will begin to flash. Within 15-30 seconds the “TRACKING” light will be ON solid -OR- the “SEARCHING” light will be ON solid. When the satellite has been acquired the “TRACKING” light will be ON solid. You may then select desired program channel. See DBS Receiver Manual for details. Perform the following when the ship HAS significantly changed geographic location or satellite selection, and the system has been turned OFF.

You enter information on the TAC 92 keyboard: 1. Turn Power “ON” Power switch is located in upper right corner of TAC-92 Rear panel. Turn on Television and Satellite receiver 2. During initialization, press “SHIP” twice 3. Key in the correct Latitude to the nearest degree. Use the “N/S/E/W” key to select either North or South hemisphere, then press “ENTER”. 4. Press the “SHIP” key once more 5. Key in the correct Longitude to the nearest degree. Use the “N/S/E/W” key to select East or West Longitude, then press “ENTER”. 6. If you have the TAC-92 interfaced to the ships GYRO, press “SHIP” once more. (If not, Go To Step 8) 7. Key in the current ships Heading to the nearest degree, then press “ENTER”. Go to Step 11 8. Press the “MODE” key 5 times. Key in 7979, then press “ENTER”. Press “MODE” once more or until the display reads “AZ TRIM xxxx”. CONTINUED ON BACK...

The TAC 92 will display: Display should read “REMOTE INITIALIZING” System will automatically go through an initialization sequence which takes approximately 2 minutes. Display should read “LAT xxx”

Display will change to read “LON xxx”

Display should read “HDG xxx.x”

Display should read “AZ TRIM xxxx” DOC.#117192

9. From the MAGNETIC VARIATION TABLE below, choose the city nearest your location and key in its AZ TRIM value using all 4 digits; for POSITIVE values press “ENTER”, for NEGATIVE values, press “N/S/E/W” and then press“ENTER”. 10. Press “MODE” until “SAVE NEW PARAMETERS” is displayed. Press the UP arrow once, release, then press “ENTER”. 11. Press the “SAT” key twice. 12. Key in the appropriate SAT Longitude from the SATELLITE POSITION TABLE below. Use the “N/S/E/W” key to select East or West Longitude, then press “ENTER”. 13. Press ”RESET”. After initialization...

Display should read “SAVE NEW PARAMETERS”

Display should read “SAT xxx”.

Display will change to read “REMOTE...VER.x.xx”

When Initialization is complete the “SEARCHING” light (green) will flash and the “UNWRAP” light (red) may be ON. In approximately 30 seconds the “SEARCHING” and “UNWRAP” lights will extinguish and the “TRACKING” light (green) will begin to flash. Within 15-30 seconds the “TRACKING” light will be ON solid -OR- the “SEARCHING” light will be ON solid. When the satellite has been acquired the “TRACKING” light will be ON solid. You may then select desired program channel. See DBS Receiver Manual for details.

SATELLITE POSITION TABLE SATELLITE SERVICE DSS (Direct TV ® & USSB®) Dish Network® GLA™ (Galaxy Caribbean) WeSat™ - GOES 8 WeSat™ - GOES 10

SATELLITE LONGITUDE (enter) 101W 119W, 65W, 148W 95W 75W 135W

MAGNETIC VARIATION TABLE Choose the city nearest your location and key in its AZ TRIM value. See Steps 8 and 9 above. POSITIVE variations for West Coast U.S. and NEGATIVE for East Coast U.S. LATITUDE & LONGITUDE 48N 123W 38N 122W 33N 117W 30N 90W 28N 82W 26N 80W 37N 76W 39N 75W 44N 70W

LOCATION Seattle, WA San Francisco, CA San Diego, CA New Orleans, LA Tampa, FL Miami, FL Norfolk, VA Atlantic City, NJ Portland, ME

AZ TRIM Value (enter) 0190 0160 0130 0020 -0030* -0040* -0100* -0130* -0180*

*Negative AZ TRIM is entered by pressing the “N/S/E/W” key before pressing “ENTER”.

Sea Tel, Inc. 1035 Shary Court Concord, CA 94518

Look to the Leader. Look to SeaTel.

TEL: 925-798-7979 E-Mail: [email protected] www.seatel.com


III

Troubleshooting Procedures


Each test in this troubleshooting section steps through specific operations of the system. If the system does not operate as explained, then follow the Troubleshooting Guide module listed after each step. This section also includes common problems experienced in the field and solutions for each. The Troubleshooting Guide modules are arranged in alphabetical order (i.e., AZD, ENC, UNWRAP, etc.). Each module refers to drawings and/or schematics which should be used during troubleshooting. The drawings and schematics for all Series 94 model systems can be found in SECTION 5 following the troubleshooting modules. The Drawing list is organized by Model and includes a list of radome and TAC-92C drawings. The drawings following the listing are in drawing number order.

1

Basic system power-up and initial operation

This set-up procedure should be used for initial operation of the system. This will ensure that the antenna system is set up correctly before trying to isolate a possible Electrical and/or Mechanical fault. The most common failures are due to incorrect operator settings, incorrect parameter settings or blockage.

1.1

Turn on the satellite receiver(s)

Using the remote, make the menu selections necessary to view the signal meter display (Most European receivers do not have this option). This display will help in determining if the antenna is tracking the correct satellite. Also, the signal meter shows a transponder number. The odd numbered transponders indicate “left hand” polarized signals and the even numbered transponders indicate “right hand” polarized signals. This information will be useful if troubleshooting an RF distribution problem.

1.2

Other Distribution Equipment

Assure that modulators, standards converters, amplifiers and any other equipment in the system configuration are also energized.

1.3

Turn on the TV(s)

Assure that the television is set for the correct channel (or input) to display the satellite programming.

1.4

WeSat Equipment

If applicable, turn ON WeSat receiver and open the Weather software on the computer and select “receive Geostationary”. A helpful tool is to connect a speaker to the audio jack on the COM port that the weather information comes into. Static can be heard until the antenna crosses or finds the weather satellite and a high “ping” or “beep” can be heard. Also, be sure to select EXT input in step 1.5.4 below.

1.5

Turn TAC-92C Power ON

The following steps may be performed during or after Initialization. Initialization will take 2 minutes. When initialization has completed the display will read the remote (PCU) Model and software version information until a menu button is pressed. 1.5.1

Press RESET and record the TAC-92C software version number displayed. The display should then change to read “REMOTE INITIALIZING”.

ü If the display is blank, refer to TAC-92C, Display Blank (below) ü If the display reads “REMOTE NOT RESPONDING”, refer to ERR4.0 ü If the ERROR LED is ON, press mode until the error code display is selected. Refer to ERR1.0 to troubleshoot the error(s). ü If the UNWRAP LED is ON for more than 2 minutes, refer to UNWRAP1.0 - 3-1 -

Troubleshooting Procedures 1.5.2


Front Panel key checks

Sequentially press SHIP, SAT, ANTENNA and MODE to verify that each displays the appropriate menu items. If the display does not change when the keys are pressed, refer to section 3 (below) – TAC-92C, Display does not change. 1.5.3

Press the SHIP key and verify that Latitude, Longitude and Heading are correct. If they are correct go to the next step. If Latitude, Longitude or Heading are incorrect

ü Press SHIP key again to select Latitude entry mode to update the present ship latitude. Enter the correct numeric value using the Numeric Keypad; use the N/S/E/W key to select the correct hemisphere and then press ENTER. ü Press SHIP key again to select Longitude entry mode to update the present ship longitude. Enter the correct numeric value using the Numeric Keypad; use the N/S/E/W key to select the correct hemisphere and then press ENTER. ü Press SHIP key again to select Heading mode. When the heading input is coming from a Ships Gyrocompass, the initial heading MUST be entered for most gyro types (see Heading Display Test section below). Enter the correct numeric heading value using the Numeric Keypad and then press ENTER. The display may “flash” back to some other number after pressing “ENTER”. This is because the antenna is initializing and cannot accept the input until after initialization. The entry made is stored by the TAC-92C and will update the PCU and should not need to be re-entered after initialization completes. 1.5.4

Press SAT and verify the Satellite Longitude and Receiver Selection & Tuning are correct

ü Refer to the Quick Start operation card(s) for a list of commonly used satellite longitudes. Press SAT again to select Satellite entry mode. Enter the correct numeric value using the Numeric Keypad; use the N/S/E/W key to select the correct hemisphere and then press ENTER. ü Press SAT until the only the lower line is displayed. This display will show the AGC Input source & Tuning frequency (i.e. INA 01100) in the lower left and the present AGC value in the lower right. Use the N/S/E/W key to toggle through the input selections, use the numeric keypad to enter the desired frequency and press ENTER. When WeSat operation is being used, select EXT input (no tuning frequency). For TVRO operation, use the INA xxxxx selection and enter the Ku-band downlink frequency, or the appropriate Intermediate Frequency (IF), of the desired satellite transponder. This can be obtained from Satellite listings in almanacs, magazines or on the Internet. 1.5.5

Verify that the TAC-92C parameters are set correctly

A list of the factory default parameters can be found in the appropriate Installation & Operation manual for your model antenna. To access these parameters press the MODE key 5 times, the display will read AZ xxxx EIRP xxxx. At this display, key in the number 7979 and press ENTER. Press MODE to step down through the parameter displays listed below. To change a setting, key in the correct number and press ENTER. After verifying all parameters, continue pressing MODE until the display reads “SAVE NEW PARAMETERS”. Press the UP ARROW once, then press ENTER to save any changes made in the previous steps. Incorrect parameter settings are a frequent cause of not being able to target the desired satellite or not being able to track the satellite properly ü EL TRIM – Trims the Elevation display to optimize Targeting. Normally set to 0000 for all models. ü AZ TRIM – Trims the Azimuth display to optimize Targeting. When using the internal fluxgate for heading input, this parameter is set to the value of magnetic variation of the geographic location of the boat. When using an external fluxgate for heading input, this parameter is set to the value of magnetic variation of the geographic location of the boat - 3-2 -



+/- any mechanical error in the radome mounting. When the heading input source is from a Gyrocompass (True heading) this parameter is mechanical mounting error only. ü AGC THRES – Set to 0128 ü EL STEP SIZE – When operating in step track mode, set to 0002. When operating in Conscan tracking mode, set to 0003. ü AZ STEP SIZE - When operating in step track mode, set to 0002. When operating in Conscan tracking mode, set to 0003. ü STEP DELAY – Set to 0002 ü SEARCH INC – Set from 0018 to 0020 ü SEARCH LIMIT – Set to 0200 ü SEARCH DELAY – Set to 0015 ü STEP INTEGRAL – When operating in step track mode, set to 0030, 0040 or 0060. When operating in Conscan tracking mode, this parameter MUST be set to 0000. ü SYSTEM TYPE – Most commonly set to 72 or 76 ü GYRO TYPE – Set to 0000 when the antennas own internal fluxgate is being used for heading reference. Set to 0000 when an external fluxgate compass is being used for heading reference (002 may be used on TAC-92C ver 2.77 or later). On 3294, 4094 and 4894 systems the degree of accuracy needed is best met with the use of a ships gyro input or an external fluxgate as its heading reference input. When using a Gyrocompass, the gyro type is determined by the type of Gyrocompass output AND the type of synchro converter (daughter board) installed on the TAC-92C Main PCB — should be set according to the TAC-92C Heading Display Test information below. Also, when using a synchro or step-by-step input source, the Heading of the boat must be entered into the HDG display every time the antenna system power is cycled ON (including power failures or switching ship/shore power). ü **Note** The heading output from a GPS is not an acceptable heading input to the TAC92C. The “heading” output from these devices are actually Course Over Ground, which does not guarantee an accurate heading reference. ü POL TYPE – Set to 0001 ü POL 1, 2, 3, 4, 5 - N/A for US DSS feeds. European linear polarization feeds should be set to default values, especially for auto-polarization operation. ü AZLIM1 - Used to set the relative position of the CCW side of a blockage zone, normally set to 0000 when not being used. ü AZLIM2 - Used to set the relative position of the CW side of a blockage zone, normally set to 0000 when not being used.

1.6

When the antenna has completed initializing, the Tracking or Searching LED should be lit. 1.6.1

If the antenna acquires the desired satellite:

Check all the receivers for adequate signal level on both the odd & the even transponders (may be done using signal meter or by observing programming channels) then go on to functional testing in step 2.0 below. 1.6.2

If the antenna is tracking on a satellite, but it is not on the DESIRED satellite:

This indicates that the system is able to acquire and track satellites. The most common causes are that the desired satellite is blocked or targeting is not accurate. Check for blockage and assure that the AZ TRIM value is set correctly.

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Assure that the TV is set to the correct input selection (CH # or LINE) for the satellite receiver output. Set the receiver to a promotional channel so programming can be seen when the antenna is on the desired satellite. Also check the IF distribution to the receivers. Some boats have multiple feeds & receivers (i.e. DSS & GLA) onboard. Assure that the correct feed & receivers are installed for the satellite service coverage in your location. Re-target or manually search for satellite. Once the desired satellite is found, evaluate AZ & EL TRIM values to optimize the targeting of the antenna. If AZ TRIM needs to be greater than +/- 10 degrees check Heading Testing in section 2 below. Refer to FLUX1.0 & MECH1.0 for troubleshooting the large value of AZ TRIM. 1.6.3

If the antenna does not acquire any satellite:

Assure that the TAC-92C receiver selection (INA, INB or IF) and tuning frequency is correct. There should be some level of AGC even when pointed away from any satellites. If the AGC level does NOT change when you unplug the coax from the rear panel of the TAC-92C, this indicates that there is a loss of IF input (failed coax, matrix switch or LNB OR a loss of DC voltage to the LNB) or a failure of the AGC tuner circuits. Refer to AGC Signal Level Tests, IF Distribution Problems and TAC-92C AGC problems below. If the AGC does change significantly (400+ AGC counts) when you unplug the coax, check for blockage and refer to Functional Testing below to isolate the failure further.

1.7

Check for blockage:

Assure that there are no obstructions between the antenna and the satellite. The satellite signal is line of sight and any object that is directly in the signal path will attenuate the signal. The satellites are in Geostationary orbit over the equator, therefore they should be south of you if you’re in the northern hemisphere or north of you if you’re in the southern hemisphere. You can visually sight past the radome toward the approximate direction of the satellites to see if there may be some object in the satellite signal path. The satellite signal will penetrate through most thin plastic and fiberglass with a small amount of attenuation but will not penetrate through metals, buildings or other structures that are in between the antenna and the desired satellite. If there IS blockage between the antenna and the desired satellite, the antenna may not be able to acquire that satellite until the boat is moved or turned to a different heading where no obstructions are in the signal path to the antenna. It may acquire, and track, an adjacent satellite which is not blocked. If there does not appear to be any blockage you may need to open the radome to assure that the antenna is pointing in the right general direction of where the satellites are (north or south of you). If the antenna does not target to the correct general pointing, it cannot possibly find a signal to track in its search area. Refer to Functional Testing below to isolate further.

2

Functional Testing 2.1

TAC-92C Front Panel Test

Test the operation of the front panel buttons to assure that the appropriate menu items appear for each key that was pressed. If the display does not change, refer to TAC-92C, Display does not change.

2.2

Azimuth Drive Test

Select Azimuth Entry mode and note the present AZ and AGC values. Press the UP or DOWN arrow key repeatedly to step the antenna position. Verify that the antenna position and AGC change as you move on to, or off of, a satellite signal. If you are not able to find a satellite signal to verify drive this way, you will have to actually observe the antenna pedestal while someone else steps the antenna from the TAC92C. Refer to AZD1.0 to troubleshoot.

2.3

Elevation Drive Test

Select Elevation Entry mode and note the present EL and AGC values. Press the UP or DOWN arrow key repeatedly to step the antenna position. Verify that the antenna position and AGC change as you - 3-4 -



move on to, or off of, a satellite signal. If you are not able to find a satellite signal to verify drive this way, you will have to actually observe the antenna pedestal while someone else steps the antenna from the TAC-92C. Refer to ELD1.0 to troubleshoot.

2.4

Targeting Test

Targeting is the accurate azimuth and elevation positioning of the antenna in three dimensional space. There are two ways you can target the antenna. They are Satellite Targeting and Azimuth and/or Elevation Targeting. Satellite Targeting is the process of targeting a desired Satellite Longitude (SAT). The TAC-92C then calculates Azimuth and Elevation angles required to point the antenna at that satellite position from the boats present LAT & LON. The Relative Azimuth (REL) angle is adjusted using the heading (HDG) and the AZ TRIM values in the TAC-92C to convert it to TRUE Azimuth (relative to TRUE North) and to compensate for mechanical radome installation error. [TRUE AZ = REL + HDG + AZ TRIM]. The antenna is then driven to the calculated True Azimuth and Elevation angles. Azimuth and/or Elevation Targeting is the process of targeting an accurate Relative Azimuth, True Azimuth or Elevation angle of the antenna. Relative Azimuth is targeted from the azimuth entry window by keying in the desired numerical value, pressing the N/S/E/W key and then pressing the ENTER key. True Azimuth is targeted from the azimuth entry window by keying in the desired numerical value and then pressing the ENTER key. Elevation is targeted from the elevation entry window by keying in the desired numerical value and then pressing the ENTER key. Normally, you target a satellite using either of the methods above, the antenna acquires the desired satellite, begins tracking it and you are able to watch the desired programming. This seems very simple … but is very complex and can be difficult to troubleshoot (you will have to investigate all of the functions and tests that relate to any of the “indications” listed below). Repeatable, accurate targeting indicates the following: •

The antenna initialized correctly to its starting REL and EL positions. There is no positive feedback of actual antenna position. The displayed position values are the result of this starting position value +/(increment/decrement) all of the steps issued to the AZ/EL motors since initialization was completed. This assumes that the initial pointing angles were achieved during initialization and that every step issued since then was carried out.

•

Azimuth drive is good. All of the steps issued to the AZ motor are being carried out. The antenna is not binding or dragging in the radome (causing pulse slipping). The drive circuits, motor and belt tension are good.

•

Elevation drive is good. All of the steps issued to the EL motor are being carried out. The antenna is not binding or dragging in the radome (causing pulse slipping). The drive circuits, motor and belt tension are good.

•

Heading input is stable and accurate.

•

AZ & EL Trim values are correct.

•

LAT & LON settings are correct.

•

The LNB is the correct frequency band and polarization type.

•

At least one LNB output is energized and the IF signal is being routed to the TAC-92C to develop the AGC to enable the TAC-92C to come out of search and begin tracking the satellite signal.

•

The satellite receiver has IF signal input from the correct satellite service and is processing audio & video outputs that are the correct video standard for the television.

•

The television is set to the correct input selection (channel number, Line or A/V) and is providing the picture and sound correspondingly. 2.4.1

Test Targeting 1.

While “on satellite”, turn Tracking OFF (press AUX1). - 3-5 -


2.4.2


2.

Select Azimuth entry and key in a value +/-100 degrees or more from the present AZ position.

3.

Select Elevation entry and key in a value of 000 or 090.

4.

The search LED will flash, indicating that the antenna is targeting to the pointing angles you specified. Allow 30-60 seconds for the antenna to drive away from the satellite.

5.

Press SAT twice, key in the desired satellite longitude and then press the ENTER key to re-target the satellite.

6.

Verify that the antenna again drives to, and acquires, the desired satellite.

7.

If Targeting accuracy is satisfactory, skip to section 2.5 to continue functional testing. If the targeting accuracy was not satisfactory, evaluate AZ & EL TRIM values to improve targeting accuracy before proceeding.

Evaluate AZ & EL TRIM Values 1.

While “on satellite”, turn Tracking OFF (press AUX1).

2.

Select Azimuth entry and key in a value +/-100 degrees or more from the present AZ position.

3.

Select Elevation entry and key in a value of 000 or 090.

4.

The search LED will flash, indicating that the antenna is targeting to the pointing angles you specified. Allow 30-60 seconds for the antenna to drive away from the satellite.

5.

Press SAT twice, key in the desired satellite longitude and then press the ENTER key to re-target the satellite. Press AUX1 to turn tracking OFF so the antenna will not go into search. Press ANTENNA to view the antenna position.

6.

When the antenna AZ & EL values stop changing, record the AZ & EL that the antenna targeted to. Press AUX1 to turn tracking ON and allow the antenna to time-out and begin searching OR manually adjust AZ & EL pointing to be ON Satellite.

7.

When the desired satellite is acquired, allow tracking to peak up the satellite signal.

8.

When peaked, record the “peak ON satellite” AZ & EL.

9.

Evaluate the amount of EL TRIM change that would be required to cause the “ON satellite” elevation to read the “Targeted” value recorded in step 6. [If “Targeted” elevation was 31.0 and “ON satellite” is 32.0, you will need –1.0 degrees change to the present EL TRIM to make the “ON satellite” elevation display a value of 31.0 - EL TRIM is entered in tenths … [in this case you would subtract 10 from the present EL TRIM].

10.

Evaluate the amount of AZ TRIM change that would be required to cause the “ON satellite” elevation to read the “Targeted” value recorded in step 6. [If “Targeted” azimuth was 180.5 and “ON satellite” is 178.0, you will need +2.5 degrees change to the present AZ TRIM to make the “ON satellite” azimuth display a value of 180.5 - AZ TRIM is entered in tenths … [in this case you would add 25 to the present AZ TRIM].

11.

Save the parameter changes and repeat step 2.4 to retest targeting accuracy.

- 3-6 -

Series 94 Troubleshooting Guide 2.5


AGC Signal Level Tests

When the antenna is not pointed at a satellite you should still have some level of AGC, representing the level of background noise from space. As you move the antenna closer to a satellite signal you will note that the AGC rise is directly proportional to the amount of satellite signal level rise (as shown in this plot). AGC levels are different for each model antenna, weather conditions and satellite signal level. There should be a very pronounced change in the AGC value when you switch the input selection between EXT, INA, INB and IF (EXT should be very low value) OR when you disconnect the IF coax from the rear of the TAC-92C while observing the normal selection (i.e. INA). If the AGC does not change, there is a loss of IF into the AGC tuner or the tuner has failed.

AGC Level vs. Antenna Position plot

The AGC value should never be 0000 or 4095. 30-40 counts of AGC is approximately 1dB of satellite signal. Auto-Threshold will normally set the Threshold at about 3dB above the background noise level. Threshold is a value that the TAC-92C uses to indicate loss of satellite signal so it can initiate a search pattern. When AGC falls below Threshold the TAC-92C will wait “search delay” number of seconds. If the AGC does not come back above Threshold before the delay time the TAC-92C will initiate a search pattern in an attempt to acquire/re-acquire a viable satellite signal. AGC Test 1. 2.

3. 4. 5.

Record the Peak AGC Level. Turn tracking OFF. From peak, select Azimuth or Elevation Entry mode. Step the antenna UP or DOWN while monitoring the AGC Level. The level should rapidly fall to the background noise level as the antenna is mispointed. Continue stepping the antenna until it is OFF satellite and record the background noise AGC level. Evaluate the difference in AGC level (AGC Delta). Step the antenna back to Peak, and turn tracking back ON.

If the Peak AGC is too high you may note that the AGC value does not change as you step the antenna 1 degree or more. This could be due to excessive input level which is saturating the tuner. Step the antenna OFF satellite and record position and AGC (about every 0.2 degrees) as you step the antenna back through Peak to OFF satellite (opposite side). Plot the AGC vs. Position on graph paper. If the tuner is being saturated, the resultant curve will be flattened on top rather than a smooth curve to a narrow rounded peak. To correct this, add sufficient attenuation in-line into the tuner to prevent it from being saturated. AGC Delta is commonly 400-700+ on most model antennas while in adequate footprint signal areas. This should provide good Tracking and good satellite receiver signal processing. AGC Delta of less than 200 indicates poor satellite signal level (weak area of footprint). The satellite receiver may loose some, or all, programming channels. Tracking will not hold peak signal level as effectively (it will still track, but programming will be lost).

- 3-7 -

Troubleshooting Procedures 2.6


Tracking Test

A simple way to test tracking is to conduct a 4-Quadrant test. 1. Turn tracking OFF 2. Select Azimuth Entry mode 3. Step the antenna DOWN in AZ until the AGC falls about 100 counts. If the antenna has Conscan you will see 6s flashing in the lower left of the display. Turn tracking ON and verify that the antenna moves up in azimuth and re-peaks the AGC level. 4. Turn tracking OFF and step the antenna UP in AZ until the AGC falls about 100 counts. If the antenna has Conscan you will see 4s flashing in the lower left of the display. Turn tracking ON and verify that the antenna moves down in azimuth and re-peaks the AGC level. 5. Select Elevation Entry mode, turn tracking OFF and step the antenna UP in EL until the AGC falls about 100 counts. If the antenna has Conscan you will see 2s flashing in the lower left of the display. Turn tracking ON and verify that the antenna moves down in elevation and re-peaks the AGC level. 6. Turn tracking OFF and step the antenna DOWN in EL until the AGC falls about 100 counts. If the antenna has Conscan you will see 8s flashing in the lower left of the display. Turn tracking ON and verify that the antenna moves up in elevation and repeaks the AGC level.

2.7

Heading Testing

Heading input is used for Targeting a satellite (the Heading input is added to the Relative position of the antenna to equal the TRUE Azimuth position of the antenna) and as a long term input to the Azimuth Stabilization loop. The Gyro Type parameter must be set correctly for the type of heading input device. The heading input must be stable (after power is turned ON, most Gyrocompasses will take 4 hours, or more, to “settle” and provide a steady heading output). The antenna will not stay pointed ON satellite if the Heading input is not stable. The more accurate the heading input is, the more accurate targeting will be. Refer to the paragraph on Targeting Test to check targeting accuracy. 2.7.1

Internal Fluxgate

When using the antenna’s internal fluxgate, the TAC-92C calculates the ship’s heading using the fluxgate reference and the relative feedback. The heading value displayed should be within +/- 10 degrees of the boat’s actual heading. If it is not, Fluxgate Compensation needs to be performed (refer to COMP1.0) or there is external interference on the fluxgate (due to steel or magnetic mass). Gyro Type is set to 0000 (0002 can be used on TAC-92C software ver 2.77 or later). AZ TRIM value is the Magnetic Variation for the geographic location of the boat). Steel hull boats, or boats with large steel or magnetic masses will cause the internal fluxgate to be inaccurate (the masses warp the earth’s magnetic field). In this situation, install an external (calibratable) fluxgate, or Gyrocompass, to be used as the heading input for the system. If the HDG and AZ displays are incorrect by more than +/- 10 degrees or the HDG is not stable (drifts or wanders from the boats actual heading when dockside or on a steady course) troubleshoot using COMP1.0, MINST1.0 & FLUX1.0. 2.7.2

External Fluxgate

When using an external fluxgate (i.e. Ritchie DL-200 or KVH Autocomp 1000) as the heading input to the TAC-92C, it should be connected to J-13 (NMEA input) on the rear panel of the TAC92C. Because this input comes into the Aux. Serial Port (J-13) the sum that is entered as the System Type Parameter value must include 8 (i.e. 8, 12 or 72). - 3-8 -



Gyro Type parameter is 0000 (0002 should be used on TAC-92C software ver 2.77 or later). NOTE: If the external fluxgate is not energized or the input fails, the TAC-92C may revert to using the antenna’s internal fluxgate. The device must be NMEA0183 compliant, be properly installed and calibrated (compensation). Heading is displayed directly from the device output, you will not be able to enter a “heading” value to correct the display (display will revert to the value read). The heading value displayed should be within +/- 1.0 degrees of the boat’s actual heading. If it is not, compensation needs to be performed or the device is not aligned to the bow of the boat correctly (refer to the manual for the device). AZ TRIM value is the sum of the Magnetic Variation for the geographic area +/- any radome mounting error (accuracy of the alignment of the radome so that Relative 360.0 is parallel to the bowline of the boat). If the HDG is not stable (drifts or wanders +/- 1.0 degree from the boats actual heading when dockside or on a steady course) troubleshoot using the manual for the external fluxgate device. 2.7.3

Gyrocompass - NMEA Heading Output:

When using an NMEA Heading Output from a Gyrocompass as the heading input to the TAC92C, it should be connected to J-13 (NMEA input) on the rear panel of the TAC-92C. Because this input comes into the Aux. Serial Port (J-13) the sum that is entered as the System Type Parameter value must include 8 (i.e. 8, 12 or 72). Gyro Type parameter is 0000 (0002 can also be used on latest TAC-92C software). NOTE: If the Gyro is not energized or the input fails, the TAC-92C may revert to using the antenna’s internal fluxgate. The device must be NMEA0183 compliant, be properly installed and calibrated. Heading is displayed directly from the device output, you will not be able to enter a “heading” value to correct the display (display will revert to the value read). The heading value displayed should be within +/- 1.0 degrees of the boats actual heading. If it is not, the device is not aligned to the bow of the boat correctly (refer to the manual for the device). Gyrocompass output is TRUE (relative to True North), therefore the AZ TRIM value is ONLY the radome mounting error (accuracy of the alignment of the radome so that Relative 360.0 is parallel to the bow-line of the boat). Azimuth display will be HDG + REL + AZ TRIM. If the HDG is not stable (drifts or wanders +/- 1.0 degree from the boat’s actual heading when dockside or on a steady course) troubleshoot using the manual for the Gyrocompass. 2.7.4

Gyrocompass – Step-By-Step (SBS) Heading Output

When using SBS Heading Output from a Gyrocompass as the heading input to the TAC-92C, it must be connected to TB3 on the Terminal Mounting Strip (Com, A, B & C connections) which plugs into J-3 on the rear panel of the TAC-92C. Gyro Type parameter is 0002. This output is comprised of 6 discrete DC voltage state changes (steps) on the three phase lines per degree of heading change. You MUST enter the heading of the boat EVERY time the TAC92C power is turned ON to provide an initial heading. Heading is incremented, or decremented, as steps are received from the Gyrocompass. The heading value displayed should be within +/- 1.0 degrees of the boat’s actual heading. If the heading is incorrect, attempt to enter in the correct heading and then monitor the heading. If the display is still not correct, then there is a problem with the gyro input. This may also cause the error light to come on.

- 3-9 -



Gyrocompass output is TRUE (relative to True North), therefore the AZ TRIM value is ONLY the radome mounting error (accuracy of the alignment of the radome so that Relative 360.0 is parallel to the bowline of the boat). Azimuth display will be HDG + REL + AZ TRIM. If the HDG is not stable (drifts or wanders +/- 1.0 degree from the boat’s actual heading when dockside or on a steady course) troubleshoot using the manual for the Gyrocompass. If you are getting Error Code 0001 or 0002 refer to ERR1.0. Also refer to Ships Gyro Input Fault Isolation below. 2.7.5

Gyrocompass – Synchro Heading Output

CAUTION: Electrical Shock Hazard - Synchro Ships Gyrocompass outputs are commonly 110VAC 60 or 400 Cycle. This AC voltage is still present at the Terminal Mounting Strip and inside the TAC-92C when the TAC-92C power is turned OFF. When using Synchro Heading Output from a Gyrocompass as the heading input to the TAC-92C, it must be connected to TB1 on the Terminal Mounting Strip (R1, R2, S1, S2 & S3 connections) which plugs into J-3 on the rear panel of the TAC-92C. Gyro Type parameter is set to the correct value for the ratio of the Synchro information AND for the Synchro Converter (daughter board) installed on the Main PCB inside your TAC-92C. The ratio is the number of AC sinewave transitions on the output phases (S1, S2 & S3) per full 360 degree turn of the boat. 1:1 Synchro is Gyro Type 0001 36:1 Synchro is Gyro Type 0036 90:1 Synchro is Gyro Type 0090 360:1 Synchro is Gyro Type 0360 or 0362 (dependent on Synchro Converter) You MUST enter the heading of the boat EVERY time the TAC-92C power is turned ON to provide an initial heading if you are using 36:1, 90:1 or 360:1. Heading is incremented, or decremented, as sinewave transitions are received from the Gyrocompass. The heading value displayed should be within +/- 1.0 degree of the boat’s actual heading. If the heading is incorrect, attempt to enter in the correct heading and then monitor the heading. If the display is still not correct, then there is a problem with the gyro input. This may also cause the error light to come on. Gyrocompass output is TRUE (relative to True North), therefore the AZ TRIM value is ONLY the radome mounting error (accuracy of the alignment of the radome so that Relative 360.0 is parallel to the bowline of the boat). Azimuth display will be HDG + REL + AZ TRIM. If the HDG is not stable (drifts or wanders +/- 1.0 degree from the boats actual heading when dockside or on a steady course) troubleshoot using the manual for the Gyrocompass. If you are getting Error Code 0001 or 0002 refer to ERR1.0. Also refer to Ship’s Gyro Input Fault Isolation below.

2.8

Underway Testing

Check Heading to assure that the displayed value agrees with the actual heading of the boat. If you are connected to a Gyrocompass and the display does not follow the Gyrocompass reading correctly refer to Ship’s Gyro Input Fault Isolation section below. Monitor the signal level while the system is tracking the satellite and the boat is underway. Excessive signal level variations that occur in sync with the motion of the boat may indicate that stabilization is not operating correctly.

- 3-10 -

Series 94 Troubleshooting Guide 2.9


Initialization Test

If you have isolated problems to the antenna (Targeting, Stabilization or Tracking) this is the best test to start troubleshooting the antenna with. In many cases it is very difficult to open the radome and view the pedestal … but it is by far the best test to start with. Remove the radome top. Cycle the TAC-92C power off. With power off, rotate the Level Platform fully CW against the stop, tilt the antenna about 10 degrees off level and rotate the antenna to point straight up at zenith. Refer to MECH1.0, VIS1.0 and INIT1.0. Have someone turn TAC-92C power ON while observing the antenna as it begins its initialization, which continues for approximately 2 minutes.

2.10

Rate Sensor / Stabilization Test

If all the functions during initialization are correct, then turn tracking or searching off after the antenna targets, to test the rate sensors. All three rate sensors require 12 volt DC input and will output 2.5 volts +/- 100 MV with no motion across the rate sensor axis. When motion is applied, the rate sensor has a voltage range of 0 to 5 VDC (+/- 2.5) depending on the direction of the motion. Perform the following checks to isolate any problems.

2.11

1.

Turn tracking and/or searching off to stop the antenna from moving.

2.

Slightly loosen the three Philips screws securing the Elevation rate sensor mounting plate. “Wiggle” the rate sensor and observe the elevation motor react by moving the antenna in the opposite direction of the applied motion. Tighten screws when finished. If the antenna does not react in elevation, follow ELR1.0.

3.

Slightly loosen the three screws securing the Cross Level rate sensor. “Wiggle” the rate sensor and observe the cross level motor react by moving the cross level beam in the opposite direction of the applied motion. Tighten screws when finished. If the antenna does not react in cross-level, follow CLR1.0.

4.

Slowly move the Azimuth rate sensor back and forth and observe the azimuth motor move the antenna pedestal in the opposite direction of the applied motion. If the antenna does not react in azimuth, follow AZR1.0.

Fluxgate Compensation Test

The fluxgate is located in the level platform assembly on the antenna. The demodulation circuit for the fluxgate is in the PCU (Pedestal Control Unit). Sea Tel compensates the fluxgate on all antennas and PCUs before shipment. However, once installed on the boat, compensation should be performed to calibrate the fluxgate to the new location. Also, if the PCU or fluxgate is ever replaced, a compensation should be done to match the new hardware. Use the following procedures at the TAC-92C to compensate the fluxgate. Use the troubleshooting modules to isolate any failures. 1.

Press [MODE] until the display reads “REMOTE COMP”. Press the [↑] key and then press [ENTER] to start fluxgate compensation. The display should now read “PLEASE WAIT”. The antenna will rotate from the CW stop, nearly 540 degrees, close to the CCW stop. This procedure will take approximately 2 minutes. When the test is complete, the display will read either “COMP COMPLETE”, “COMP RANGE ERROR” or “COMP GAIN ERROR”.

2.

COMP COMPLETE: This indicates a successful compensation. § Press [MODE] until the display reads “REMOTE PARAMETERS” § Press the [↑] key and then press [ENTER]. This will save the new compensation parameters to NVRAM in the PCU.

3.

COMP RANGE ERROR: This indicates a problem at the antenna or external magnetic interference. ANTENNA: 3 possible problems with the antenna. § A bad fluxgate compass. Use FLUX1.0 to isolate. - 3-11 -



§

Faulty wiring from the fluxgate to the PCU (Pedestal Control Unit). Use FLUX1.0 to isolate. § If the tests above check out satisfactory, then replace the PCU and follow the Remote Compensation Procedure to calibrate the new PCU. EXTERNAL MAGNETIC INTERFERENCE: § Check for equipment within 4-5 feet of the antenna, which may contain magnets, or large amounts of steel. § If the boat is steel or there are magnetic objects that cannot be relocated, then the solution is to interface the system with a Ship’s Gyrocompass (S-B-S or Synchro) or an EXTERNAL Fluxgate compass (Ritchie DH-200 or KVH Autocomp 1000). 4.

3

COMP GAIN ERROR: This error will occur if there is not enough signal for the fluxgate. If there is too much signal a “COMP RANGE ERROR” will probably occur first. If the system has worked well until the boat traveled to a northern latitude, the problem is most likely not enough signal for the fluxgate to accurately process. To rule out a faulty fluxgate, follow FLUX1.0. Other causes could be from external magnetic interference (i.e., steel, and magnets).

Symptom / Problem Scenarios 3.1

Antenna Drifts Off Satellite

Improper tracking, parameter settings, rate sensor disturbance or problems with the fluxgate/Gyrocompass can cause drifting off the satellite after lock. Verify that the tracking parameters (EL STEP SIZE, AZ STEP SIZE and STEP INTEGRAL) are set correctly. If the system is using the internal fluxgate compass, use the Fluxgate Compensation procedure to isolate the problem (COMP1.0 & FLUX1.0). If the system is interfaced with the ship’s gyro, check the heading display on the TAC-92C and verify this matches the ship’s heading on the Gyrocompass. Use the Heading Input tests and fault isolation sections to isolate the problem. If the Heading Input is found to be good, refer to INIT1.0 to check Initialization of the antenna, then AZR1.0, CLR1.0 and ELR1.0 to troubleshoot the rate sensors.

3.2

Channels Freeze Frame

Many times this will only occur on certain channels. This could be due to heavy rainfall or the ship operating on the edge of the satellite footprint. Also, a common problem is the F connectors are not securely fastened. Tighten all of these connectors and re-check the system operation. If all channels are freeze framing, check to see if the TAC-92C is maintaining steady tracking of the satellite (Tracking LED steadily lit). If some channels are good, the tracking light is on and the antenna is pointed at the correct azimuth and elevation angle, then troubleshoot only the RF distribution to the receivers or the receivers themselves. In both cases the TAC-92C should be configured to output 10-21 VDC to the LNB. Verify the configuration by checking that the SYSTEM TYPE is set to 0072 or 0076. Check the AGC on the TAC-92C, referring to AGC Signal Level Tests. If the AGC is good, use the IF Distribution Test. Voltage output is low, zero or too high (greater than 22VDC) replaced the AGC RECEIVER PCB P/N 113037. - 3-12 -



If voltage is good at the TAC-92C output, then check the voltage at the LNB. This voltage should be approximately 18 volts at the input of the LNB on the antenna. If voltage output is low or not there at all, do a continuity check of all coax cables leading from the TAC92C to the LNB. If the voltage is good, but AGC shows below 800, then swap the two cables at the LNB outputs. Check the AGC again. If AGC is still below 800, replaced the LNB. Also refer to SIG1.0 to troubleshoot.

3.3

Constant Unwrap LED

An unwrap occurs when the PCU reads the antenna pedestal is close to one of the two azimuth mechanical stops. The mechanical stops should be at a Relative position of 0090 and 0630, allowing the antenna 540 degrees of rotation. When the antenna is in the center of this mechanical range of rotation, the REL position of the antenna is 360.0 and the system should be facing in line with the bow. When the relative position of the antenna is within 5 degrees of one of the stops an unwrap will be electronically initiated (at 095.0 REL or 620.0 REL) and the antenna will be driven 360 degrees (plus or minus heading changes during the unwrap) away from that mechanical stop. The PCU will send an unwrap indicator back to the TAC-92C, which will turn on the red unwrap LED. Usually, an unwrap is completed in approximately 20-30 seconds. This is a normal operation of the antenna and satellite programming will be lost until the antenna completes unwrapping. The antenna should reacquire the satellite without intervention from the operator. On systems with an encoder, the PCU monitors the encoder output to decide when an unwrap should occur. If the encoder output fails, the system may stay in unwrap. For ENCODER equipped systems refer to ENC1.0 & UNWRAP1.0 to troubleshoot. On systems without an encoder, an unwrap failure can happen if the pedestal movement is restricted at any time (i.e., antenna scraping inside of dome or cables inside radome catching on pedestal). In “encoder-less” systems, refer to UNWRAP1.0 to troubleshoot.

3.4

Heading Input Fault Isolation

If the heading input source is inaccurate or unstable that antenna may not be able to target or stay on satellite. The heading display should follow the heading source exactly, if the display is not updating, not staying accurate or is changing opposite to what the input source is doing use the procedures below to isolate the problem. If you are getting Error Code 0001 or 0002 also refer to ERR1.0. 3.4.1

Internal Fluxgate Fault Isolation

If the system is using its own internal fluxgate compass, the difference could be as much as 5-10 degrees. As long as the system locates the satellite within a reasonable time (2-3 minutes after initialization), then this is not a problem. If then TAC-92C heading is off by more than 15-20 degrees and takes longer than 10 minutes to find the satellite or does not find it, then try to compensate the fluxgate compass. Refer to Fluxgate Compensation Test above to compensate the fluxgate and use FLUX1.0 to troubleshoot. 3.4.2

Ships Gyrocompass Fault Isolation - General

All gyro types except 1:1 & NMEA require the operator (user) to input the ship heading in the TAC-92C HDG display each time the system is turned ON. The gyro input can be checked underway or by manually slewing the gyro in port. CAUTION: Electrical Shock Hazard - Synchro Ships Gyrocompass outputs are commonly 110VAC 60 or 400 Cycle. This AC voltage is still present at the Terminal Mounting Strip and inside the TAC-92C when the TAC-92C power is turned OFF. Check the GYRO TYPE parameter to assure that the correct value is entered to correctly read the output from the Gyrocompass. The available gyro types are: § 0000 for NMEA O183 Heading Output, wired to the Aux. Serial Port Adapter (J13) - 3-13 -

Troubleshooting Procedures § § § § § § 3.4.3


0001 for 1:1 input (usually installed on older military) 0002 for S-B-S (Step-By-Step) installed on some yachts and commercial vessels 0036 for 36:1 (usually on military boats) 0090 for 90:1 (rare) 0360 for 360:1 (on yachts and some commercial) 0362 for 360:1 (on yachts and some commercial) SBS Gyrocompass Output [DC Voltage Signaling]

You MUST enter the heading of the boat EVERY time the TAC-92C power is turned ON to provide an initial heading. Heading is incremented, or decremented, step transitions are received from the Gyrocompass. If there is no error light but the heading on the TAC-92C moves the wrong direction, then swap the A and B leads. If the Error LED (error code reads 0001) and the error will not clear, check the gyro-input voltages at TB6 on the terminal mounting strip. Measure the voltage from COM to A, B & C respectively. One or two legs should be high (+ or – voltage level) and one or two will be low (below 10 VDC). All three legs should never be High or Low at any instant in time (violation of Gyro truth table, which causes Error 0001). If not, check the ship’s gyro output. Voltage on high leg should be approximately (+35, -35, +70, -70), depending on the voltage level of the gyro being used. Voltage on low leg must be below 10 volts. AC or noise spikes on the line is the most common cause of Error code 0001 (two lines are high and the low line has noise which is interpreted by the TAC-92C as a high state … therefore, all three lines appear to be high which is an illegal state). Measure from chassis ground to COM and the voltage should be a constant (0 volts, +/-35 or +/70), without varying more than a few volts up and down. If it does vary with ship’s movement (i.e. low to high to low), then this is probably not the COM leg. Re-wire as necessary. Verify that the COM has not been wired to the lamp output of the gyro. This would probably give a reading of ~15-20 VDC. Refer to ERR2.0 for more information and troubleshooting. 3.4.4

Synchro Gyrocompass Output [AC Voltage Signaling] (36:1, 90:1 or 360:1)

You MUST enter the heading of the boat EVERY time the TAC-92C power is turned ON to provide an initial heading if you are using 36:1, 90:1 or 360:1. Heading is incremented, or decremented, as sinewave transitions are received from the Gyrocompass. After initialization of the system and setting the ship’s heading into the TAC-92C HDG display, verify the heading on the TAC-92C follows the gyro. If the gyro turns in the wrong direction, swap the S2 and S3 leads at TB7. 3.4.5

Synchro Gyrocompass Output [AC Voltage Signaling] (1:1 ONLY)

You CANNOT enter the heading of the boat when you are using 1:1 Synchro input. The heading is directly read by the TAC-92C based on the relationship of S1, S2 and S3 sinewaves. Gyro Type parameter setting is 0001. After initialization, the HDG display should read the same as the ship’s gyro. •

If the Heading display reads 180 degrees opposite the ship’s gyro, then swap the R1 & R2 inputs to TB7 of the Terminal Mounting Strip. Press [RESET] to verify change in HDG display.

•

If the Heading display reads 60 or 300 degrees from ship’s gyro, swap the R1 & R2 leads and then rotate the S1, S2 & S3 leads either forward or backward one position. Press [RESET] to verify changes. - 3-14 -

Series 94 Troubleshooting Guide •

3.5


If the Heading display reads 120 or 240 degrees from ship’s gyro, rotate the S1, S2 & S3 connections either forward or backward one position and press [RESET].

IF Distribution Problem

Set each satellite receiver to the signal meter. Set one of the receivers to an odd transponder (i.e. 3,5,7) and another receiver to an even transponder (i.e. 2,4,6). This will isolate whether the channel freeze is on one polarity or both. Also, check the interconnection of the system. Check to see if there is a multiswitch and check if one coax is looped through the TAC-92C or directly connected to RF IN A on the rear panel. With multiple receivers, both coax cables from the radome should connect directly to the multiswitch. Be sure the connections are correct before troubleshooting any further; refer to the appropriate System Interconnect, Wiring or Block Diagrams for your system. IF SIGNAL LEVEL LOW OR ZERO ON ONE POLARITY (i.e. odd or even transponder) Set all receivers to the polarity (even or odd transponder) that shows a problem. Do all receivers show the same problem? YES § § §

Swap the cables on the input to the multi-switch. This will change the cable and LNB output that is feeding each polarity. If the problem stays on the same polarity, then change the multi-switch. If the problem moves to the other polarity, then check the coax cable feeding that polarity. The multi-switch is marked at the inputs 13/14 VDC and 17/18 VDC. The low voltage feeds the odd transponders and the high voltage (17/18) feeds the even transponders. If the cable checks out okay, then replace the LNB.

NO § § §

The coax leading from the multi-switch to the receiver may be bad. Check continuity. If the cable is okay, check the output of the TAC-92C at RF IN A. Output should be approximately 20 volts. If the voltage is okay, the multi-switch may be bad. Swap the multi-switch output cable with another one that is good. If the problem moves to the other receiver, replace the multiswitch. If the problem stays with the same receiver, then re-check the cable. If the cable is good, replace the receiver.

IF SIGNAL LEVEL IS LOW OR ZERO ON BOTH EVEN AND ODD TRANSPONDERS The problem may be weather related. KU-band is very susceptible to rain and/or moisture attenuation. Check the area of operation. Boat may be at the edge of the footprint for the system. Check all F connectors and verify all IF connections are secure. Also refer to SIG1.0 for troubleshooting IF Signal problems.

3.6

Remote Not Responding

This problem occurs if there is a loss of communication between the PCU and the TAC-92C. The communication is RS-422 carried on four (4) conductors in the control cable. Refer to ERR4.0 and the following to isolate the problem.

3.7

TAC-92C Display Blank

If the display does not illuminate when the TAC-92C power switch is turned ON, check the following items to help isolate the problem: Check to assure that the correct level of AC Voltage is available at the outlet and at the TAC-92C end of the power cord. Extract the Voltage Select/Fuse Holder Module from below the plug receptacle and test both fuses. Plug the module back in (correct voltage selection) to the TAC-92C power module, plug the power cord in also. If power or fuse fault was found, turn power ON, check the display and continue operation. To isolate shorted input connections: - 3-15 -



Turn power OFF, disconnect J1, turn power ON and check the display. If the display is lit, refer to ACC1.0 and SPOOL1.0. Turn power OFF, disconnect J3, turn power ON and check the display. If the display is lit, troubleshoot Gyrocompass connections for shorts. Turn power OFF, disconnect J11, turn power ON and check the display. If the display is lit, troubleshoot the Aux. Serial Port input connections for shorts. Turn power OFF, disconnect J13, turn power ON and check the display. If the display is lit, troubleshoot Aux. Serial Port input connections for shorts. If the display is still not lit, open the TAC-92C and test the AC Voltage at the terminal barrier strip for the transformer input. Refer to TAC1.0 to troubleshoot further.

- 3-16 -

Series 94 Troubleshooting Guide Step

Check/Test to perform

ACC1.0

Antenna Control Cable

ACC Results

Action to take - step to go to

At the Antenna Control Unit, disconnect P1 and visually inspect connector. Are any pins bent, broken or pushed into the body of the connector?

Yes

Straighten, reseat or replace pins as needed and re-check.

At the antenna, disconnect the 9-pin circular plug and visually inspect. Are any pins bent, broken or pushed into the body of the connector? Continuity checks

Yes

Refer to drawing 114787 Shielded Control Cable Assembly ACU to PCU ACC1.1

ACC1.2

Turn TAC-92C power OFF. Visually inspect antenna control cable connections.

Install DE-9 loop-back continuity test connector (shorts 1-2, 3-4, 5-6, 7-8 and 9shield) on P1 at the ACU end of the antenna control cable. Check continuity of the Antenna Control Cable at the Antenna 9-pin Circular connector Plug: Circ-1 to Circ-2 = Short Circ-3 to Circ-4 = Short Circ-5 to Circ-6 = Short Circ-7 to Circ-8 = Short Circ-9 to Circ-spade = Short Is continuity good? Remove the DE-9 loop-back continuity test connector from P1. Check P1 continuity from metal body (shield) to pins: P1-1 to Shield = Open P1-2 to Shield = Open P1-3 to Shield = Open P1-4 to Shield = Open P1-5 to Shield = Open P1-6 to Shield = Open P1-7 to Shield = Open P1-8 to Shield = Open P1-9 to Shield = Open Is harness shorted?

- 4-1 -

No Straighten, reseat or replace pins as needed and re-check.

No

Yes No

Repair harness and re-check

Yes

Repair and re-check

No

ACC Step

Series 94 Troubleshooting Guide Check/Test to perform

Results


Check P1 continuity from pin to pin: P1-1 to P1-2 = Open P1-1 to P1-3 = Open P1-1 to P1-4 = Open P1-1 to P1-5 = Open P1-1 to P1-6 = Open P1-1 to P1-7 = Open P1-1 to P1-8 = Open P1-1 to P1-9 = Open P1-2 to P1-3 = Open P1-2 to P1-4 = Open P1-2 to P1-5 = Open P1-2 to P1-6 = Open P1-2 to P1-7 = Open P1-2 to P1-8 = Open P1-2 to P1-9 = Open P1-3 to P1-4 = Open P1-3 to P1-5 = Open P1-3 to P1-6 = Open P1-3 to P1-7 = Open P1-3 to P1-8 = Open P1-3 to P1-9 = Open P1-4 to P1-5 = Open P1-4 to P1-6 = Open P1-4 to P1-7 = Open P1-4 to P1-8 = Open P1-4 to P1-9 = Open P1-5 to P1-6 = Open P1-5 to P1-7 = Open P1-5 to P1-8 = Open P1-5 to P1-9 = Open P1-6 to P1-7 = Open P1-6 to P1-8 = Open P1-6 to P1-9 = Open P1-7 to P1-8 = Open P1-7 to P1-9 = Open P1-8 to P1-9 = Open Are harness lines shorted? Were repairs made to the harness in the previous three steps?

Yes

Repair and re-check

- 4-2 -

No

Yes No

Return


ACC

Step


ACC1.3

DC Voltage checks

ACC1.3.1

Re-connect antenna control cable and turn TAC-92C power ON. Check the DC Voltage from C48 to ground on the TAC-92C Main PCB. Record the DC voltage.

ACC1.3.2

Check the DC Voltage at the Pol Aux Relay PCB from P1-3 (+28VDC) to P1-6 (ground). Record the DC voltage Subtract the voltage recorded in step ACC1.3.2 from the voltage recorded in step ACC1.3.1. Is the loss across the antenna control cable less than 3.0VDC? Is the antenna control cable 100 ft or less in length?

Results


Yes No

Return

Yes

Repair or replace the antenna control cable and re-test ACC1.3 Contact Sea Tel Service department for instructions on installing junction boxes and heavier gage antenna control cable conductors. Correct then re-test ACC1.3

No

- 4-3 -

AZD


Step


AZD1.0

Azimuth Drive problems

AZD1.1

AZD1.2

Refer to the Antenna System Schematic and the Pedestal Harness Schematic drawings for all voltage and continuity checks. Test Azimuth drive to determine the nature of the drive problem. Turn the TAC-92C power ON, turn tracking OFF (press AUX1) and observe azimuth drive while the antenna is initializing, or while stepping, slewing or targeting azimuth. Does the antenna drive properly in azimuth?

Results


Yes Yes, Azimuth drives but not consistently No, Azimuth drives the wrong direction. No Azimuth drive.

Return AZD1.2

Yes

Contact Sea Tel Service department

AZD1.6

AZD1.2

No Azimuth drive or drive is not consistent Turn TAC-92C power OFF and remove radome top (or open the radome door): Inspect inside of radome for signs that the dish or feed have been rubbing against the inside of the fiberglass radome. Are there signs of rubbing? Rotate the pedestal through 540 degree range of azimuth motion. The antenna should rotate freely and easily with light finger pressure. Do the azimuth bearings rotate freely with no binding in Azimuth? Assure that the cables in the base of the radome are not restricting or binding the free rotation of the pedestal. Is there cable restriction noted? Check the azimuth drive belt. Is the belt broken or loose? Is the 44 pin connector (P1) properly mated to the PCU?

No Yes No

Yes

Re-route or tie cables away from pedestal and re-check.

No Yes

Replace or re-tension the belt and re-check.

No Yes No

Are the harness and motor IDC connections (J4 & J5) mated properly on the terminal board (TB1)?

Yes

Are any wires in the IDC connectors (J4 & J5) broken or frayed?

Yes

- 4-4 -


No

No

Re-mate connection and recheck Re-mate connection and recheck Repair and re-check.


AZD


Results


Turn TAC-92C power ON AZD1.3

+12VDC test Check the DC Voltage on J4 and J5, from pin 3 to ground and pin 4 to ground. Is the +12.0 VDC OK?

AZD1.4

Yes > 11VDC No, voltage is low (< 11VDC) or missing

AZD1.7

No, voltage is good on J4 but missing on J5

Repair/replace TB1 and recheck

Motor (M1) Continuity Disconnect P5 and check continuity of the motor windings, measure from: P5-1 to P5-3 or 4 ~25Ù P5-2 to P5-3 or 4 ~25Ù P5-5 to P5-3 or 4 ~25Ù P5-6 to P5-3 or 4 ~25Ù P5-1 to P5-2 ~50Ù P5-5 to P5-6 ~50Ù Is motor winding continuity good? Check continuity of the motor windings to ground: P5-1 to ground = Open P5-2 to ground = Open P5-3 to ground = Open P5-4 to ground = Open P5-4 to ground = Open P5-6 to ground = Open Is the motor shorted?

Yes No

No

Motor shorted - Replace motor and re-check AZD1.5

Reconnect P5 and re-test azimuth drive. Is azimuth drive restored?

Yes No

Return AZD1.5

Yes


AZD1.5

Harness Continuity

AZD1.5.1

Turn TAC-92C power OFF. Disconnect P1 from the PCU and visually inspect P1. Are any pins bent, broken or pushed into the body of the connector? Disconnect P4 and check continuity from: P4-1 to P1-28 = Short P4-2 to P1-26 = Short P4-4 to P1-44 = Short P4-5 to P1-8 = Short P4-6 to P1-5 = Short Is continuity good?

- 4-5 -

Yes

No Yes No

Motor Open - Replace motor and re-check


AZD Step

AZD1.5.2


Results


Check continuity from: P4-1 to ground = Open P4-2 to ground = Open P4-4 to ground = Open P4-5 to ground = Open P4-6 to ground = Open P4-1 to P4-2 = Open P4-1 to P4-4 = Open P4-1 to P4-5 = Open P4-1 to P4-6 = Open P4-2 to P4-4 = Open P4-2 to P4-5 = Open P4-2 to P4-6 = Open P4-4 to P4-5 = Open P4-4 to P4-6 = Open P4-5 to P4-6 = Open Is harness shorted? Were repairs made to the harness in the previous three steps?

Yes


Replace PCU (failed drivers), re-connect all cables and turn TAC-92C power ON. Is Azimuth drive restored? AZD1.6

AZD1.1

No Yes

Return

No

Verify motor wire color code to P5 per Pedestal Harness Schematic. Is the P5 wired correctly? Verify correct software in PCU. Is the software correct for the antenna model?

Yes No

Plug spare motor (unmounted) into TB1. Does spare motor turn same direction as the installed motor?

Yes No

+12VDC is low (< 11VDC) or missing

AZD1.7.1

Is the +12.0 VDC approximately half the nominal voltage? Check the Voltage Select/Fuse block in the power module on the rear panel of TAC-92C. Is it set for the correct AC line voltage?

AZD1.7.3

Yes


Azimuth drives wrong direction

AZD1.7

AZD1.7.2

No

Re-check DC voltage from J4 and J5 pin 3 to ground and pin 4 to ground. Is the +12.0 VDC OK now? Disconnect P5 from TB1 and check +12VDC from P4 pin 4 to ground. Is the +12.0 VDC OK? - 4-6 -

Yes No

Yes No Yes No Yes > 11VDC

Replace motor and re-check

Replace PCU software with correct version and re-check AZD1.5 Replace motor and re-test AZD1.1

AZD1.7.3 Set for correct AC voltage then next Re-test AZD1.1

No Yes No

Motor short – Replace motor then AZD1.7.2


AZD


Results


Disconnect P4 from TB1 and check +12VDC from P4 pin 4 to ground. Is the +12.0 VDC OK?

Yes

TB1 short - Repair/replace TB1, then AZD1.7.2

Disconnect P1 from the PCU and check the DC voltage From J1 pins 40, 41, 42, 43 and 44 to ground. Is the +12.0 VDC OK? Turn TAC-92C power OFF and reconnect P1, P4 and P5. Turn TAC-92C power ON and recheck DC voltage from J4 and J5 pin 3 to ground and pin 4 to ground. Is the +12.0 VDC OK? AZD1.7.4

AZD1.7.5

AZD1.7.6

AZD1.7.7

No Yes No Yes

Harness open/short – AZD1.5.1 then next AZD1.7.4 AZD1.7.2

No

Pedestal Harness short – Isolate shorted wire(s) or component(s), repair and recheck

Check DC voltage from P2-15 to ground under load. This may also be done by opening the back-shell of P2 to access pin 15 OR by opening the PCU and access on U14 pin 5. Is the voltage +24VDC or greater?

Yes

+12VDC regulator failure Replace PCU then AZD1.8

Monitor the voltage from P2-15 to ground and unplug P1 from the Pol Aux Relay PCB. Is the voltage +24VDC or greater when P1 is unplugged? Monitor the voltage from P2-15 to ground and unplug P1 from PCU. Is the voltage +24VDC or greater when PCU P1 is unplugged?

Yes

Unplug P2, remove the 15-Pin In-Line TestPoint connector from PCU and check the voltage from P2-15 to ground. Is the voltage +26VDC or greater? Unplug the 9-pin Circular plug from the bracket (jack) in the base-pan of the radome. Check the DC voltage at the plug from pin 9 to pin 5. Is the voltage +26VDC or greater? Unplug P1 from the rear panel of the ACU and check the DC voltage from J1-9 to J1-5. Is the voltage +26VDC or greater? Remove top cover of the TAC-92C and test DC voltage from Main PCB connector J5-3 to ground. Is the voltage +26VDC or greater?

Yes

Turn TAC-92C power OFF. Install the 15-Pin In-Line Test-Point connector between P2 and the PCU. Turn TAC-92C power ON.

Turn the TAC-92C Power OFF, unplug the AC line cord from the rear panel and extract the voltage select block. Test both fuses (250V 2Amp Slow-Blow). Are BOTH fuses good?

- 4-7 -

No

Pol/Feed short – isolate, repair and re-check

No Yes

Pedestal short – isolate, repair, and re-check

No PCU short – replace PCU, then AZD1.8

No Yes

Spool cable – SPOOL1.0 then AZD1.8

No Yes No

ACC1.0 then AZD1.8

Yes

Loss of +28VDC path – Replace Main PCB then AZD1.8

No Yes No

Replace fuse(s) then next

AZD Step

AZD1.8


Results


Re-insert the voltage select block (assure it is in the correct orientation for the AC line voltage) and re-install the AC line cord. Turn TAC-92C power ON and test DC voltage from Main PCB connector J5-3 to ground. Is the voltage +28VDC restored (> +26VDC)? Turn TAC-92C power OFF and reconnect all unplugged connections. Reinstall ACU & PCU covers as necessary. Turn TAC-92C power ON and re-check DC voltage from J4 and J5 pin 3 to ground and pin 4 to ground. Is the +12.0 VDC OK now?

Yes

AZD1.8

No

TAC1.0 then AZD1.8

Yes > 11VDC No

Re-test AZD1.1 Contact Sea Tel Service Department

- 4-8 -


AZR

Step


AZR1.0

Azimuth Rate Sensor

AZR1.1

Test for rate sensor read errors which may cause any of the following symptoms; 1. Antenna drives to the stops when initializing or targeting a new azimuth. 2. Antenna does not stabilize in azimuth axis properly. 3. The Unwrap LED may be frequently or constantly lit. 4. Antenna may oscillate in azimuth from one end stop to the other end stop. Refer to the Antenna System Schematic and the Pedestal Harness Schematic drawings for all voltage and continuity checks..

AZR1.2 AZR1.2.1

AZR1.2.2

AZR1.2.3

AZR1.2.4

Fig 1 Azimuth rate sensor and connection. Turn TAC-92C power OFF and remove radome top (or open the radome door): Disconnect P1 from the PCU and visually inspect P1. Are any pins bent, broken or pushed into the body of the connector? Measure continuity from the metal body of the rate sensor to pedestal ground (=Open). Is the rate sensor isolated from ground? Refer to figure 1. If the rate sensor is installed upside-down (connector down) the antenna may oscillate from one azimuth stop to the other. Is the rate sensor mounted in the correct orientation? Remove the conductive tape from the rate sensor. Save tape to reinstall later.

Results


Yes


No Yes No

AZR1.3

Yes No

Re-install in correct orientation

Refer to figure 1. Is the IDC connection (P18) mated properly in the rate sensor.?

Yes No

Re-mate connection and recheck

Are any wires in the IDC connector (P18) broken or frayed?

Yes No

Repair and re-check.

- 4-9 -

AZR


Step


Results


AZR1.2.5

The rate sensor must be firmly mounted to the level cage. Grip the body of the rate sensor with thumb and fore-finger of one hand while holding the level cage firmly in the other hand. Gently wiggle the rate sensor. Is the mounting plate loose on the level cage? The rate sensor must be firmly mounted to its’ mounting plate. Grip the body of the rate sensor with thumb and fore-finger of one hand while holding the level cage firmly in the other hand. Gently wiggle the rate sensor. Is the rate sensor loose on the mounting plate? Remove the two Phillips screws that attach the mounting plate to the level cage, tighten the rate sensor mounting screws and recheck. Is the rate sensor still loose on the mounting plate?

Yes

Tighten the two Philips screws to secure the mounting plate to the level cage and re-check.

AZR1.2.6

AZR1.3

Yes No

Yes No

AZR1.5

Replace the rate sensor mounting plate and re-check. Re-install the mounting plate (and rate sensor) on the level cage and re-check AZR1.2.5

Rate sensor isolation Remove the conductive tape and check continuity from the metal body of the rate sensor to pedestal ground (=Open). Is the rate sensor still shorted to pedestal ground? Remove the two Philips screws to detach the mounting plate (and rate sensor) from the level cage. Is the rate sensor still shorted to pedestal ground?

Yes No

Tighten the rate sensor mounting screws and re-check. Is the rate sensor still loose on the mounting plate?

Yes

AZR1.4

Harness continuity

AZR1.4.1

Disconnect P1 & P18 and check continuity from: P18-1 to P1-34 = Short P18-4 to P1-18 = Short P18-5 to P1-40 = Short Is continuity good? Check continuity from: P18-1 to ground = Open P18-4 to ground = Open P18-5 to ground = Open P18-1 to P18-4 = Open P18-1 to P18-5 = Open P18-4 to P18-5 = Open Is harness shorted? Were repairs made to the harness in the previous three steps?

AZR1.4.2

No

- 4-10 -

Yes No

Tape was shorting – re-check AZR1.2.2 AZR1.4.1, then re-check AZR1.2.2 Screws were shorting - Next

No

Replace the rate sensor mounting plate and re-check. Re-check AZR1.2.2

Yes No


Yes


No

Yes No

AZR1.1



AZR1.5

Nominal output voltage

AZR Results


Reconnect P1 and P18. Turn TAC-92C power ON Assure that the boat is not moving at the pier and disconnect P5 (azimuth motor) from TB1. The pedestal is not to be rotated while monitoring the rate sensor output voltage (rate sensor not being rotated in free space).

AZR1.6

AZR1.7

Monitor the rate sensor output DC voltage from P18 pin 4 to ground. Nominal when the rate sensor is not being rotated is 2.50VDC +/-100mV. Is the voltage OK? Output voltage varies with motion

Yes No

Rotate the antenna in azimuth while continuing to monitor the output voltage. CW rotation should cause the output to increase above 2.50VDC and CCW rotation causes the voltage to decrease below 2.50VDC. The amount of increase/decrease from nominal is proportional to the rate of rotation. Does the output vary as the antenna is rotated?

Yes No

AZR1.8 Replace rate sensor and recheck AZR1.5

Measure the DC voltage from P18 pin 5 to ground (metal body). Is the 12 VDC OK?

Yes

Replace rate sensor and recheck AZR1.5

Disconnect P1 from the PCU and check the DC voltage from J1 pin 40 to ground. Is the +12VDC OK? AZR1.8

AZR1.9

No Yes No

Re-connect P5 (azimuth motor) to TB1 and turn TAC-92C ON. Loosen the two Philips screws securing the rate sensor mounting plate, grip the rate sensor with your finger and thumb and gently “wiggle” (rotate left-right) the rate sensor. Does azimuth drive the pedestal in response to rotation of the rate sensor? Were repairs made during the harness continuity checks?

Yes No

Turn TAC-92C OFF. Tighten the two Philips screws to secure the rate sensor mounting plate to the pedestal. Re-install the conductive tape over the rate sensor IDC connection. Assure that the tape does not short any of the wires in the IDC connector and does not short the body of the rate sensor to the pedestal ground or the harness shield/braid. Re check AZR1.3. Is the rate sensor isolated from ground? Reconnect P1 to the PCU and turn TAC-92C power ON

Yes No

- 4-11 -

Yes No

AZR1.7

AZR1.4.1, then re-check AZR1.5 Replace PCU and re-check AZR1.5 AZR1.9 AZR1.4.1, then next

Re-check AZR1.5 Replace PCU and re-check AZR1.8 Re-tape and re-check

Return

CLD


Step


CLD1.0

Cross Level Drive problems

CLD1.1

CLD1.2

Refer to the Antenna System Schematic and the Pedestal Harness Schematic drawings for all voltage and continuity checks. Test Cross Level drive to determine the nature of the drive problem. Tilt the cross level beam about 10 degrees off level, then turn the TAC-92C power ON and observe Cross Level drive while the antenna is initializing. Does the antenna drive properly in Cross Level?

Results


Yes Yes, Cross Level drives but not consistently No, Cross Level drives the wrong direction. No Cross Level drive.

Return CLD1.2

Yes


CLD1.6

CLD1.2

No Cross Level drive or drive is not consistent Turn TAC-92C power OFF and remove radome top (or open the radome door): Inspect inside of radome for signs that the dish or feed have been rubbing against the inside of the fiberglass radome. Are there signs of rubbing? Rotate the pedestal through ~60 degree range of Cross-Level motion (tilt). The antenna should rotate freely and easily with light finger pressure. Do the Cross-Level bearings rotate freely with no binding in Cross-Level? Assure that the cables on the pedestal are not restricting or binding the free rotation of the pedestal. Is there cable restriction noted? Check the Cross Level drive belt. Is the belt broken or loose? Is the 44-pin connector (P1) properly mated to the PCU?

No Yes No

Yes No Yes

Re-route or tie cables on the pedestal and re-test. Replace or re-tension the belt and re-test.

No Yes No


Yes

Are the wires in the IDC connectors (J7 & J8) broken or frayed?

Yes

- 4-12 -


No

No

Re-mate connection and retest Re-mate connection and retest Repair and re-test.


CLD


Results


Turn TAC-92C power ON CLD1.3

+12VDC test Check the DC Voltage on J7 and J8, from pin 3 to ground and pin 4 to ground. +12.0 VDC OK?

CLD1.4

Yes > 11VDC No, voltage is low (< 11VDC)

CLD1.7




Yes No

No

Motor shorted - Replace motor and re-check CLD1.5

Reconnect P8 and re-test Cross Level drive. Is Cross Level drive restored?

Yes No

Return CLD1.5

Yes


CLD1.5

Harness Continuity

CLD1.5.1


- 4-13 -

Yes

No Yes No

Motor open - Replace motor and re-check


CLD Step

CLD1.5.2


Results



Yes

Repair and re-check

Replace PCU (failed drivers), re-connect all cables and turn TAC-92C power ON. Is Cross Level drive restored? CLD1.6

CLD1.1

No Yes

Return

No

Verify motor wire color code to P8 per Pedestal Harness Schematic. Is the P8 wired correctly? Verify correct software in PCU. Is the software correct for the antenna model?

Yes No


Yes No


CLD1.7.1


CLD1.7.3

Yes


Cross Level drives wrong direction

CLD1.7

CLD1.7.2

No


Yes No

Yes No Yes No Yes > 11VDC


Replace PCU software with correct version and re-check CLD1.5 Replace motor and re-test CLD1.1

CLD1.7.3 Set for correct AC voltage then next Re-test CLD1.1

No Yes No

Motor short – Replace motor then CLD1.7.2


CLD


Results



Yes

TB2 short - Repair/replace TB2, then CLD1.7.2

Disconnect P1 from the PCU and check the DC voltage From J1 pins 40, 41, 42, 43 and 44 to ground. Is the +12.0 VDC OK? Turn TAC-92C power OFF and reconnect P1, P7 and P8. Turn TAC-92C power ON and recheck DC voltage from J7 and J8 pin 3 to ground and pin 4 to ground. Is the +12.0 VDC OK? CLD1.7.4

CLD1.7.5

CLD1.7.6

CLD1.7.7

No Yes No Yes

Harness open/short – CLD1.5.1 then next CLD1.7.4 CLD1.7.2

No


Check DC voltage from P2-15 to ground under load. This may also be done by opening the backshell of P2 to access pin 15 OR by opening the PCU and access on U14 pin 5. Is the voltage +24VDC or greater?

Yes

+12VDC regulator failure Replace PCU then CLD1.8


Yes


Yes



- 4-15 -

No


No Yes


No PCU short – replace PCU, then CLD1.8

No Yes

Spool cable – SPOOL1.0 then CLD1.8

No Yes No

ACC1.0 then CLD1.8

Yes

Loss of +28VDC path – Replace Main PCB then CLD1.8

No Yes No


CLD Step

CLD1.8


Results



Yes

CLD1.8

No

TAC1.0 then CLD1.8

Yes > 11VDC

Re-test CLD1.1

No


- 4-16 -


CLR

Step


CLR1.0

Cross Level Rate Sensor

CLR1.1

Test for rate sensor read errors which may cause any of the following symptoms; 1. Antenna drives to either stop when initializing. 2. Antenna does not stabilize in Cross Level axis properly. 3. Antenna may oscillate in Cross-Level from one end stop to the other end stop. Refer to the Antenna System Schematic and the Pedestal Harness Schematic drawings for all voltage and continuity checks.

Results


Yes


Fig 1 Cross-Level rate sensor and connection.

CLR1.2 CLR1.2.1

CLR1.2.2

CLR1.2.3

CLR1.2.4

Fig 2 Tilt sensor PCB and connections Turn TAC-92C power OFF and remove radome top (or open the radome door): Disconnect P1 from the PCU and visually inspect P1. Are any pins bent, broken or pushed into the body of the connector? Measure continuity from the metal body of the rate sensor to pedestal ground (=Open). Is the rate sensor isolated from ground? Refer to figure 1. If the rate sensor is installed backwards (connector forward) the antenna may oscillate from one Cross Level stop to the other. Is the rate sensor mounted in the correct orientation? Remove the conductive tape from the rate sensor. Save tape to reinstall later. - 4-17 -

No Yes No Yes No

CLR1.3 Re-install in correct orientation

CLR Step


Results

Refer to figure 1. Is the IDC connection (P6) mated properly in the rate sensor?

Yes

Are any wires in the IDC connector (P6) broken or frayed? CLR1.2.5

CLR1.2.6

CLR1.2.7

CLR1.3

The rate sensor must be firmly mounted to the pedestal. Grip the body of the rate sensor with thumb and forefinger of one hand while holding the level cage firmly in the other hand. Gently wiggle the rate sensor. Is the mounting plate loose on the pedestal? The rate sensor must be firmly mounted to its’ mounting plate. Grip the body of the rate sensor with thumb and forefinger of one hand while holding the pedestal firmly in the other hand. Gently wiggle the rate sensor. Is the rate sensor loose on the mounting plate? Remove the three Phillips screws that attach the mounting plate to the pedestal, tighten the rate sensor mounting screws and re-check. Is the rate sensor still loose on the mounting plate? Refer to figure 2. Inspect the tilt sensor PCB to assure that the leads on the under-side of the PCB are not shorted to the level cage enclosure (there should be three plastic spacers between the PCB and the aluminum). Are any leads shorted? Refer to figure 2. Inspect the two 5-pin IDC connectors (P16 has three wires and P15 has five wires as shown in figure 2). Assure they are plugged in correctly (correct orientation with no gap between them and no exposed pins on the header). Are the connectors plugged in correctly? Are any wires in the IDC connectors (P15 & P16) broken or frayed?

No Yes No Yes


Re-mate connection and recheck Repair and re-check. Tighten the three Philips screws to secure the mounting plate to the pedestal and re-check.

No Yes No

Yes No

Yes

CLR1.5

Replace the rate sensor mounting plate and re-check. Re-install the mounting plate (and rate sensor) on the pedestal and re-check CLR1.2.5 Remove the PCB, trim leads or replace spacers and reinstall. The tilt sensor may be damaged TILT1.0

No Yes No


Yes

Repair and re-check

No

Rate sensor isolation Remove the conductive tape and check continuity from the metal body of the rate sensor to pedestal ground (=Open). Is the rate sensor still shorted to pedestal ground? Remove the three Philips screws to detach the mounting plate (and rate sensor) from the pedestal. Is the rate sensor still shorted to pedestal ground?

Yes No


Yes

- 4-18 -

Yes No

No

Tape was shorting – re-check CLR1.2.2 CLR1.4.1, then re-check CLR1.2.2 Screws were shorting - Next Replace the rate sensor mounting plate and re-check. Re-check CLR1.2.2


CLR

Step


CLR1.4

Harness continuity

CLR1.4.1

Disconnect P1 & P6 and check continuity from: P6-1 to P1-5 = Short P6-4 to P1-8 = Short P6-5 to P1-44 = Short (through TB1) Is continuity good? Check continuity from: P6-1 to ground = Open P6-4 to ground = Open P6-5 to ground = Open P6-1 to P6-4 = Open P6-1 to P6-5 = Open P6-4 to P6-5 = Open Is harness shorted?

Yes No


Yes


CLR1.4.2

Were repairs made to the harness in the previous three steps?

Yes No

CLR1.5

Nominal output voltage

CLR1.6

Reconnect P1 and P6. Turn TAC-92C power ON Assure that the boat is not moving at the pier. The pedestal is not to be rotated (tilted leftright) while monitoring the rate sensor output voltage (rate sensor not being rotated in free space). Monitor the rate sensor output DC voltage from P6 pin 4 to ground. Nominal when the rate sensor is not being rotated is 2.50VDC +/-100MV. Is the voltage OK? Output voltage varies with motion

CLR1.7

Results


No

Yes No

CLR1.1

CLR1.7

Loosen the three Philips screws securing the rate sensor mounting plate, grip the rate sensor with your finger and thumb and gently “wiggle” (rotate up/down) the rate sensor while continuing to monitor the output voltage. CW (DOWN) rotation should cause the output to increase above 2.50VDC and CCW (UP) rotation causes the voltage to decrease below 2.50 VDC. The amount of increase, or decrease, from nominal is proportional to the rate of rotation. Does the output vary as the rate sensor is rotated?

Yes No

CLR1.8 Replace rate sensor and recheck


Yes

Replace rate sensor and recheck CLR1.5

No

- 4-19 -

CLR Step

CLR1.8

CLR1.9


Results


Disconnect P1 from the PCU and check the DC voltage from J1 pin 44 to ground. Is the +12VDC OK?

Yes

CLR1.4.1, then re-check CLR1.5 Replace PCU and re-check CLR1.5 CLR1.9 CLR1.4.1, then next

No

Re-connect P1 and turn TAC-92C ON. Grip the rate sensor with your finger and thumb and gently rotate (up/down) the rate sensor. Does Cross-Level drive the pedestal in response to rotation of the rate sensor? Were repairs made during the harness continuity checks?

Yes No

Turn TAC-92C OFF. Tighten the three Philips screws to secure the rate sensor mounting plate to the pedestal. Re-install the conductive tape over the rate sensor IDC connection. Assure that the tape does not short any of the wires in the IDC connector and does not short the body of the rate sensor to the pedestal ground or the harness shield/braid. Re check CLR1.3. Is the rate sensor isolated from ground?

Yes No

Reconnect P1 to the PCU and turn TAC-92C power ON

- 4-20 -

Yes No

Re-check CLR1.5 Replace PCU and re-check CLR1.8 Re-tape and re-check

Return


COMP

Step


Results

COMP1.0

Remote Compensation Failure


Access “Remote Comp” selection of the remote parameters of the TAC-92C. Press UP arrow key, then the ENTER key. Display will read “Please Wait”

COMP1.1

Compensation will take about two minutes. During this time the antenna will measure the magnetic deviation while slowly rotating in azimuth. When finished the results will be displayed. Does the display read “Comp Complete”?

COMP1.2

Press MODE twice to display “Remote Parameters”. Press the UP arrow key then press the ENTER key to save the compensation values to NVRAM in the PCU. Does the display read “Comp Range Error“?

COMP1.2.1

COMP1.3

COMP1.5

COMP1.2 Return

Yes

FLUX1.0, if FLUX has been followed and the error persists then COMP1.2.1

No Yes No

COMP1.3 COMP1.4

Is the boat steel hull/super-structure?

Yes No

COMP1.5 Contact Sea Tel Service department

Does the display read “Comp Gain Error”?

Yes No Yes No

COMP1.0 COMP1.5 COMP1.1

Yes

Relocate then COMP1.0

No

COMP1.5 Return

This error may be due to excessive magnetic disturbances. Is the antenna within 6 feet of large metal masses or magnetic fields from speakers or large Radar motors?

There may not be sufficient magnetic field intensity for the Fluxgate to read (common in Northern latitudes). Use FLUX to rule out equipment failure and re-compensate. Does the error persist? COMP1.4

Yes No

Can the antenna be re-located farther away from the magnetic disturbances? Interface TAC-92C to a Ships Gyrocompass (SBS or Synchro) or an External Fluxgate (Ritchie DH-200 or KVH Autocomp 1000)

- 4-21 -

ELD


Step


ELD1.0

Elevation Drive problems

ELD1.1

Refer to the Antenna System Schematic and the Pedestal Harness Schematic drawings for all voltage and continuity checks. Does the level cage drive properly?

ELD1.2

ELD1.3

Results

Test Elevation drive to determine the nature of the drive problem. Turn the TAC-92C power ON, turn tracking OFF (press AUX1). Observe level cage & elevation drive while the antenna is initializing, or while stepping, slewing or targeting azimuth. Does the antenna drive properly in elevation?

Yes No


LEV1.0

Yes Yes, Elevation drives but not consistently No, Elevation drives the wrong direction. No Elevation drive.

Return ELD1.3

Yes


ELD1.7

ELD1.3

No Elevation drive or drive is not consistent Turn TAC-92C power OFF and remove radome top (or open the radome door): Inspect inside of radome for signs that the dish or feed have been rubbing against the inside of the fiberglass radome. Are there signs of rubbing? Rotate the pedestal through 90-degree range of Elevation motion. The antenna should rotate freely and easily with light finger pressure. Do the Elevation bearings rotate freely with no binding in Elevation? Assure that the cables on the pedestal are not restricting or binding the free rotation of the pedestal. Is there cable restriction noted? Check the Elevation drive belt. Is the belt broken or loose? Is the 44-pin connector (P1) properly mated to the PCU?

No Yes No

Yes No Yes

Re-route or tie cables on the pedestal and re-check. Replace or re-tension the belt and re-check.

No Yes No


Yes

Are the wires in the IDC connectors (J10 & J11) broken or frayed?

Yes

- 4-22 -


No

No

Re-mate connection and recheck. Re-mate connection and recheck. Repair and re-check.


ELD


Results


Turn TAC-92C power ON ELD1.4

+12VDC test Check the DC Voltage on J10 and J11, from pin 3 to ground and pin 4 to ground. Is the +12.0 VDC OK?

ELD1.5

Yes > 11VDC No, voltage is low (< 11VDC) or missing

ELD1.8




Yes No

No

Motor shorted - Replace motor and re-check ELD1.6

Reconnect P11 and re-test elevation drive. Is Elevation drive restored?

Yes No

Return ELD1.6

Yes


ELD1.6

Harness Continuity

ELD1.6.1


- 4-23 -

Yes

No Yes No

Motor open - Replace motor and re-check.

Repair harness and re-check.

ELD Step

ELD1.6.2


Results



Yes

Repair and re-check

Replace PCU (failed drivers), re-connect all cables and turn TAC-92C power ON. Is Azimuth drive restored? ELD1.7

Verify correct software in PCU. Is the software correct for the antenna model? Plug spare motor (unmounted) into TB3. Does spare motor turn same direction as the installed motor? ELD1.8

+12VDC is low (~ 6-10VDC) or missing

ELD1.8.1


ELD1.8.3

Yes

ELD1.1

No Yes

Return

No

Contact Sea Tel Service department Sea Tel Service department

Elevation drives wrong direction Verify motor wire color code to P11. Is the P11 wired correctly?

ELD1.8.2

No


Yes No Yes No Yes No

Replace motor and re-check. Replace PCU software with correct version and re-test ELD1.6 Replace motor and re-test ELD1.2

Yes No Yes

ELD1.8.3

No

Set for correct AC voltage then next Re-test ELD1.8

Yes > 11VDC No Yes No

Motor short – Replace motor then ELD1.8.2


ELD


Results



Yes

TB3 short - Repair/replace TB3, then ELD1.8.2

Disconnect P1 from the PCU and check the DC voltage From J1 pins 40, 41, 42, 43 and 44 to ground. Is the +12.0 VDC OK? Turn TAC-92C power OFF and reconnect P1, P10 and P11. Turn TAC-92C power ON and re-check DC voltage from J10 and J11 pin 3 to ground and pin 4 to ground. Is the +12.0 VDC OK? ELD1.8.4

ELD1.8.5

ELD1.8.6

ELD1.8.7

No Yes No Yes

Harness open/short – ELD1.5.1 then next ELD1.8.4 ELD1.8.2

No


Check DC voltage from P2-15 to ground under load. This may also be done by opening the backshell of P2 to access pin 15 OR by opening the PCU and access on U14 pin 5. Is the voltage +24VDC or greater?

Yes

+12VDC regulator failure Replace PCU then ELD1.9


Yes


Yes



- 4-25 -

No


No Yes


No PCU short – replace PCU, then ELD1.9

No Yes

Spool cable – SPOOL1.0 then ELD1.9

No Yes No

ACC1.0 then ELD1.9

Yes

Loss of +28VDC path – Replace Main PCB then ELD1.9

No Yes No


ELD Step

ELD1.9


Results



Yes

ELD1.9

No

TAC1.0 then ELD1.9

Yes > 11VDC

Re-test ELD1.2

No


- 4-26 -


ELR

Step


ELR1.0

Elevation Rate Sensor

ELR1.1

Test for rate sensor read errors which may cause any of the following symptoms; 1. Antenna drives to either stop after a brief stop at the correct Elevation when initializing. 2. Antenna does not stabilize in Level (Elevation) axis properly. 3. Antenna may oscillate in Elevation from the upper end stop to the lower end stop. Refer to the Antenna System Schematic and the Pedestal Harness Schematic drawings for all voltage and continuity checks.

Results


Yes


Fig 1 Elevation rate sensor and connection.

ELR1.2 ELR1.2.1

ELR1.2.2

Fig 2 Tilt sensor PCB and connections Turn TAC-92C power OFF and remove radome top (or open the radome door): Disconnect P1 from the PCU and visually inspect P1. Are any pins bent, broken or pushed into the body of the connector? Measure continuity from the metal body of the rate sensor to pedestal ground (=Open). Is the rate sensor isolated from ground?

- 4-27 -

No Yes No

ELR1.3

ELR


Step


Results


ELR1.2.3

Refer to figure 1. If the rate sensor is installed backwards (connector toward the right end of the level beam), the antenna may oscillate from one Elevation stop to the other. On the 2494 (only) pedestal the rate sensor is mounted on the Cross-Level driven sprocket, all other models are as shown below. Is the rate sensor mounted in the correct orientation? Remove the conductive tape from the rate sensor. Save tape to reinstall later.

Yes

Re-install in correct orientation

ELR1.2.4

ELR1.2.5

ELR1.2.6

ELR1.2.7

No

Refer to figure 1. Is the IDC connection (P9) mated properly in the rate sensor?

Yes

Are any wires in the IDC connector (P9) broken or frayed?

Yes No Yes

The rate sensor must be firmly mounted to the level beam. Grip the body of the rate sensor with thumb and forefinger of one hand while holding the level beam firmly in the other hand. Gently wiggle the rate sensor. Is the mounting plate loose on the level beam? The rate sensor must be firmly mounted to its’ mounting plate. Grip the body of the rate sensor with thumb and forefinger of one hand while holding the level beam firmly in the other hand. Gently wiggle the rate sensor. Is the rate sensor loose on the mounting plate? Remove the three Phillips screws that attach the mounting plate to the level beam tighten the rate sensor mounting screws and recheck. Is the rate sensor still loose on the mounting plate? Refer to figure 2. Inspect the tilt sensor PCB to assure that the leads on the under-side of the PCB are not shorted to the level cage enclosure (there should be two plastic spacers between the PCB and the aluminum). Are any leads shorted? Refer to figure 2. Inspect the two 5-pin IDC connectors (P16 has three wires and P15 has five wires as shown in figure 2). Assure they are plugged in correctly (correct orientation with no gap between them and no exposed pins on the header). Are the connectors plugged in correctly? Are any wires in the IDC connectors (P15 & P16) broken or frayed?

- 4-28 -

No

Re-mate connection and recheck Repair and re-check. Tighten the three Philips screws to secure the mounting plate to the level beam and re-check.

No Yes No

Yes No

Yes

ELR1.5

Replace the rate sensor mounting plate and re-check. Re-install the mounting plate (and rate sensor) on the level beam and re-check ELR1.2.5 Remove the PCB, trim leads or replace spacers and reinstall. The tilt sensor may be damaged TILT1.0

No Yes No


Yes No

Repair and re-check



ELR1.3

Rate sensor isolation

ELR Results

Remove the conductive tape and check continuity from the metal body of the rate sensor to pedestal ground (=Open). Is the rate sensor still shorted to pedestal ground? Remove the three Philips screws to detach the mounting plate (and rate sensor) from the level beam. Is the rate sensor still shorted to pedestal ground?

Yes No


Yes

Yes No


Tape was shorting – re-check ELR1.2.2 ELR1.4.1, then re-check ELR1.2.2 Screws were shorting - Next

No

Replace the rate sensor mounting plate and re-check. Re-check ELR1.2.2

ELR1.4

Harness continuity

ELR1.4.1

Disconnect P1 & P9 and check continuity from: P9-1 to P1-35 = Short P9-4 to P1-3 = Short P9-5 to P1-43 = Short (through TB2) Is continuity good? Check continuity from: P9-1 to ground = Open P9-4 to ground = Open P9-5 to ground = Open P9-1 to P9-4 = Open P9-1 to P9-5 = Open P9-4 to P9-5 = Open Is harness shorted?

Yes No


Yes


ELR1.4.2


Yes No

ELR1.5

Nominal output voltage Reconnect P1 and P9. Turn TAC-92C power ON Assure that the boat is not moving at the pier. The pedestal is not to be rotated (tilted leftright) while monitoring the rate sensor output voltage (rate sensor not being rotated in free space). Monitor the rate sensor output DC voltage from P9 pin 4 to ground. Nominal when the rate sensor is not being rotated is 2.50VDC +/-100MV. Is the voltage OK?

- 4-29 -

No

Yes No

ELR1.1

ELR1.7

ELR


Step


ELR1.6

Output voltage varies with motion

ELR1.7

Results


Loosen the three Philips screws securing the rate sensor mounting plate, grip the rate sensor with your finger and thumb and gently “wiggle” (rotate fore/aft) the rate sensor while continuing to monitor the output voltage. CW (Backward) rotation should cause the output to increase above 2.50VDC and CCW (Forward) rotation causes the voltage to decrease below 2.50 VDC. The amount of increase, or decrease, from nominal is proportional to the rate of rotation. Does the output vary as the rate sensor is rotated?

Yes No

ELR1.8 Replace rate sensor and recheck


Yes

Replace rate sensor and recheck ELR1.5

Disconnect P1 from the PCU and check the DC voltage from J1 pin 44 to ground. Is the +12VDC OK? ELR1.8

ELR1.9

No Yes No

ELR1.4.1, then re-check ELR1.5 Replace PCU and re-check ELR1.5

Re-connect P1 and turn TAC-92C ON. Grip the rate sensor with your finger and thumb and gently rotate (fore/aft) the rate sensor. Does Elevation drive the pedestal in response to rotation of the rate sensor? Were repairs made during the harness continuity checks?

Yes No

ELR1.9 ELR1.4.1, then next

Yes No

Re-check ELR1.5 Replace PCU and re-check ELR1.8

Turn TAC-92C OFF. Tighten the three Philips screws to secure the rate sensor mounting plate to the pedestal. Re-install the conductive tape over the rate sensor IDC connection. Assure that the tape does not short any of the wires in the IDC connector and does not short the body of the rate sensor to the pedestal ground or the harness shield/braid. Re check ELR1.3. Is the rate sensor isolated from ground? Reconnect P1 to the PCU and turn TAC-92C power ON

Yes No

- 4-30 -

Re-tape and re-check

Return



ENC1.0

Encoder failure

ENC1.1

ENC1.2

ENC1.2.1

ENC

Common failures are; 1. Frequently/Constantly lit unwrap LED on the TAC-92C. 2. Pedestal won’t drive to the CW stop during initialization. OR Pedestal drives to the CCW stop after initialization. Test – Best test is to observe initialization of the antenna (azimuth phase). After initialization of the antenna the unwrap LED should not be frequently, or constantly, lit and the TAC-92C display of the relative position of the antenna should readout from 095 (where CCW unwrap should occur) to 625 (where CW unwrap should occur). Turn TAC-92C power OFF and disconnect encoder connector (P3). Check pins for corrosion or residue. Clean pins as needed and re-connect. Rotate the pedestal and verify that the shaft of the encoder turns freely. Does the encoder shaft turn smoothly? Check belt tension to the encoder sprocket. When the pedestal is rotated the belt should not slip on the sprocket. Does the belt slip on the encoder sprocket? Adjust mounting position of the encoder away from the belt. Rotate the shaft of the encoder. Does the shaft turn freely? Check sprocket on shaft of the encoder. Is the sprocket slipping on the shaft of the encoder?

Results


Yes No

ENC1.3

Yes

Reposition encoder for proper belt tension

No Yes No Yes

ENC1.7 Tighten set screw in the sprocket and re-test

No

Reposition encoder for proper belt tension and re-test ENC1.2.1 ENC1.3

ENC1.4

ENC1.5

Turn TAC-92C power ON. Turn tracking OFF. Disconnect P5 from TB1 to disable azimuth drive. Measure DC voltage from P3 (blue IDC at encoder) pin 2 to ground. Is the 5 VDC OK? Monitor DC voltage from P3 pin 1 to ground while slowly rotating the antenna CW or CCW in azimuth. Voltage should step from 0.0-5.0 VDC. Does voltage step OK? Monitor DC voltage from P3 pin 3 to ground while slowly rotating the antenna CW or CCW in azimuth. Voltage should step from 0.0-5.0 VDC. Does voltage step OK? Reconnect P5 (azimuth drive).

- 4-31 -

Yes No

ENC1.6

Yes No

ENC1.7

Yes No

ENC1.7

ENC


Step


ENC1.6

Turn TAC-92C power OFF. Disconnect P3 from the encoder and P1 from the PCU.

ENC1.7

Results


Check continuity: From P3-1 to P1-33 ~ Short From P3-2 to P1-16, 17 & 31 ~ Short From P3-3 to P1-32 ~ Short From P3-5 to P1-37 ~ Short Are any open lines?

Yes No

Repair, and re-test harness

Check continuity: From P3-1 to P3-2 ~ Open From P3-1 to P3-3 ~ Open From P3-1 to P3-5 ~ Open From P3-2 to P3-3~ Open From P3-2 to P3-5 ~ Open From P3-3 to P3-5 ~ Open Are there any shorted lines? Antennas shipped after January 1997 do NOT have encoders. These (current) antennas keep track of the relative position of the antenna by counting steps issued to the azimuth motor. When the encoder in an older system fails Sea Tel recommends installation of new PCU to convert to “encoder-less” operation rather than replacing the encoder. Is “encoder-less” operation desired?

Yes No

Repair, and re-test harness Replace PCU and re-test

Yes

Contact Sea Tel Service department Sea Tel Service department Replace encoder and re-test

- 4-32 -

No



ERR1.0

Error Codes

ERR Results


When the TAC-92C Error LED is lit, press mode to access the numeric value of the error in the error code display. The error code display is comprised of two values LLLL and RRRR, where LLLL is a communications counter that is not used in these systems and the RRRR display is the value of the system error(s). The error code display does NOT represent multiple occurrences of the same error (0003 is NOT three 0001s). The numeric value displayed is the SUM of the individual (different) errors that have occurred (0003 = error 0001 plus error 0002).

ERR1.1

Note the error code value and determine which error(s) it represents. To clear the error(s), press the UP arrow key while in the error code display mode, or press the RESET key. Errors should be noted, cleared and the system monitored for frequency of reoccurrence. A frequent (or constant) error is an indication of a system failure. Troubleshoot each error individually. Error code 0001 – Gyro read error.

ERR2.0

ERR1.2

Error code 0002 – Wrong Synchro Converter Type error.

ERR3.0

ERR1.3

Error code 0004 – Communications (ACUPCU) error.

ERR4.0

ERR1.4

Error code 0008 – Reserved

ERR5.0

ERR1.5

Error code 0016 – Conscan error.

ERR6.0

ERR1.6

Error code 0032 – Reserved.

ERR7.0

ERR1.7

Error code 0064 - Reserved.

ERR8.0

ERR1.8

Error code 0128 – Satellite out of range error.

ERR9.0

- 4-33 -

ERR


Step


Results

ERR2.0

Error Code 0001 – Gyro Read Error

ERR2.1

Clear this error and monitor the system for reoccurrence. Does this error re-occur?

ERR2.2

Type of Ships Gyrocompass output Verify the type of Gyrocompass signal that is being used as the “Ships Heading” input to the TAC-92C Is NMEA 0183 Heading input being used? Is Step-By-Step (SBS) Heading input being used? Is Synchro Heading input being used?

Yes No



Return

ERR2.3 ERR2.4 ERR2.5

Set Gyro Type parameter to 0000.

ERR2.3

ERR2.1

Press MODE repeatedly until “Save Parameters” is selected. Press the UP arrow, then press ENTER to save the new System & Gyro Type parameter values. NMEA Heading Gyrocompass/External Fluxgate input RS-422 ASCII Data wired to J13 ASPA port on the rear of the TAC-92C. The ASCII Data input string must contain standard HDM or HDT ID text strings.

ERR2.3.1

Is the TAC-92C Software version 2.53 or higher?

Yes No

Is the Pedestal Software the following version or higher; 4894 ver 1.32, 4094 ver 1.32, 3294 ver 1.32, 2494 DBS ver 2.51 or 2094 ver 1.06. Is the pedestal software correct? Assure that the System Type parameter value (sum of desired features) includes 8 feature to enable communications between the ASPA PCBs and the Main PCB. The most common entries are 8, 12, 72 or 76. If TAC-92C software is version 2.76 or lower set Gyro Type parameter = 0000. If TAC-92C software is version 2.77 or higher set Gyro Type parameter = 0002. Press MODE repeatedly until “Save Parameters” is selected. Press the UP arrow, then press ENTER to save the new System & Gyro Type parameter values. Remove top of TAC-92C. ASPA port software version NMEAH ver 1.04 or greater?

Yes No

- 4-34 -

Yes No

Contact Sea Tel Service department Contact Sea Tel Service department



ERR

Step


Results


ERR2.3.2

Verify that the RS-422 Data is getting to the Terminal Mounting Strip connections to the TAC-92C ASPA PCB (may require an Oscilloscope). Is the Data input OK?

Yes No

ERR2.3.4

ERR2.3.3

Verify the RS-422 Data at the Gyrocompass output. Is the Data output OK at the Gyrocompass?

Yes

Repair wiring to the ACU retest ERR2.1

Check output fuse/switch for the output line. Is the fuse/switch OK?

No Yes No

Replace fuse/turn switch ON and re-test ERR2.1

Repair the Gyrocompass and re-test ERR2.3.2. ERR2.3.4

ERR2.4

Observe NMEA LED on the ASPA PCB that the Gyrocompass input is connected to. Is the NMEA LED rapidly flashing?

Yes No

Is the Ships Heading display correct?

Yes No

SBS Gyrocompass input (6 step/degree)

Figure 1 SBS Gyrocompass Output Refer to figure 1 (above). DC voltage signaling of A, B and C phases to COM stepping in sequence noted above. This input is wired to Terminal Mounting Strip COM, A, B and C terminals and connected, via ribbon cable, to J2 port on the rear of the TAC-92C. The most common voltage levels are +/-35 or +/-70 VDC, however, check the manual for the Gyrocompass to ascertain its’ correct rated level of the output voltage. The optoisolated inputs on the Main PCB will not read properly below about 20VDC.

- 4-35 -

Replace ASPA PCB and recheck ERR2.1 Replace Main PCB and recheck

ERR Step

ERR2.4.1


Results


The most common causes of this error are; 1. Noise on the line(s), that periodically makes all three lines appear to be high when only two are actually high. 2. Loss of voltage on the lines, making all three lines go low. Correct Gyro Type parameter setting is 0002. Is Gyro Type set correctly?

Yes No

ERR2.4.2

Set Gyro Type parameter = 0002. Press MODE repeatedly until “Save Parameters” is selected. Press the UP arrow, then press ENTER to save the new Gyro Type. ERR2.1

Press SHIP repeatedly to select Ships Heading entry, enter the correct heading of the Gyrocompass. ERR2.4.2

ERR2.4.3

At the Terminal Mounting Strip, measure the DC voltage level from COM to ground. This level should be either 0VDC or the rated voltage of the Gyrocompass output (positive or negative voltage). Is the voltage level correct?

Yes No

Monitor the DC voltage level from COM to ground. This voltage level should not change as the boat turns. Does the voltage level vary as the boat turns?

Yes

Phase voltage levels should switch from high state to low state as the boat turns. The high state voltage may be positive or negative (rated voltage level of the Gyrocompass output) and the low state level should be approximately 0VDC. Monitor the DC voltage level from COM to A. Is the high state voltage level correct? Verify phase voltage does switch as the boat turns. Does the phase voltage switch to low? Is the low state voltage approximately 0VDC? Monitor the DC voltage level from COM to B. Is the high state voltage level correct? Verify phase voltage does switch as the boat turns. Does the phase voltage switch to low? Is the low state voltage approximately 0VDC? Monitor the DC voltage level from COM to C. Is the high state voltage level correct?

- 4-36 -

Verify wiring connections from Terminal Mounting Strip to the Gyrocompass output terminals. Incorrect wiring connections to the Gyrocompass output terminals.

No

Yes No Yes No Yes No Yes No Yes No Yes No Yes No

ERR2.4.4 ERR2.4.4 ERR2.4.4 ERR2.4.4 ERR2.4.4 ERR2.4.4 ERR2.4.4


ERR


Results

Verify phase voltage does switch as the boat turns. Does the phase voltage switch to low?

Yes No Yes No Yes

Is the low state voltage approximately 0VDC? ERR2.4.4

Disconnect ribbon cable from the ACU and retest 2.4.3. Are the phase voltage levels and switching correct with the ACU disconnected? At the Gyrocompass distribution box, check output fuse/switch. Is the fuse/switch OK?

ERR2.4.5

Check output terminals in the distribution box terminals. Are the phase voltage levels and switching correct?

Yes

Monitor the A, B & C Phase lines with an oscilloscope. Are there voltage spikes or noise on any of the lines?

Yes

Monitor voltage inputs to the opto-isolators circuits on the main PCB. R7 is A phase, R5 is B phase and R3 is C phase. Are the phase voltage levels and switching correct? ERR2.5

No Yes No

No

No Yes No


ERR2.4.4 ERR2.4.5 ERR2.4.4 Replace Main PCB, verify all parameters, then ERR2.1

Replace fuse/turn switch ON then next Reconnect all connections and re-test ERR2.1 Repair Gyrocompass and recheck Repair Gyrocompass and retest ERR2.1 Replace Main PCB, verify all parameters, then ERR2.1 Repair/replace ribbon cable and re-test ERR2.1

Synchro Gyrocompass input

Figure 2 Synchro Gyrocompass output Refer to Figure 2 (above) showing the AC voltage signaling of S1, S2 and S3 phases. This input is wired to the Terminal Mounting Strip R1, R2, S1, S2 and S3 terminals and connected, via ribbon cable, to J2 port on the rear of the TAC-92C. Valid Synchro input ratios are 1:1, 36:1, 90:1 or 360:1, but acceptable ratio(s) is dependant upon which Synchro Converter PCB is installed inside the TAC-92C. Is the Gyrocompass output Synchro 1:1, 36:1, 90:1 or 360:1? - 4-37 -

Yes No

Other ratios are not available.

ERR


Step


Results


ERR2.5.1

Open the top cover of the TAC-92C and verify the type of synchro converter installed on the Main PCB. The synchro converter (daughter board) is plugged into the two 20-pin header strips on the left side of the main PCB, near the rear, partially under the ASPA boards. Is a synchro converter installed?

Yes

ERR2.5.2

No

Contact Sea Tel Service department Sea Tel sales to procure an appropriate Synchro Converter PCB to install.

Figure 3 360:1 to SBS Converter ERR2.5.2

Is the PN 112790 360:1-To-SBS Synchro Converter PCB (Figure 3 above) installed? Is the Gyrocompass output 1:1 Synchro? Is the Gyrocompass output 36:1 Synchro? Is the Gyrocompass output 90:1 Synchro? Is the Gyrocompass output 360:1 Synchro?

Yes No Yes No Yes No Yes No Yes No

ERR2.5.3

Figure 4 12-Bit S/D Converter Is the PN 114836 12-Bit S/D Synchro to Digital Converter PCB (Figure 4 above) installed? - 4-38 -

ERR2.5.3 ERR2.5.4 ERR2.5.4 ERR2.5.4 Set Gyro Type parameter to 0360, then ERR2.5.5 ERR2.2

Yes No

ERR2.5.1


ERR


Results


Is the Gyrocompass output 1:1 Synchro?

Yes

Set Gyro Type parameter to 0001, then ERR2.5.5


No Yes


No Is the Gyrocompass output 90:1 Synchro?

Yes


No Yes

ERR2.5.4

Contact Sea Tel Service department Sea Tel sales dept to procure a 12-bit S/D Synchro to Digital Converter PCB (PN 114836) to install.

ERR2.5.5

Press MODE repeatedly until “Save Parameters” is selected. Press the UP arrow, then press ENTER to save the new Gyro Type.

ERR2.6

Set heading …Clear the error and monitor the system for re-occurrence. Does the error 0001 re-occur? Synchro Rotor AC Voltage The most common rotor voltage is 110 VAC, however some newer Gyrocompasses use 55 VAC output. Refer to the manual for the Gyrocompass to ascertain its proper output voltage level. This AC voltage should NOT vary as the boat turns. Measure the AC Voltage from R1 to R2 on the Terminal Mounting Strip. Is the AC voltage level correct? Monitor the AC Voltage from R1 to R2 as the boat turns. Does the AC voltage level vary?

ERR2.8

ERR2.8.1


No

Set Gyro Type parameter to 0362, then ERR2.5.5 ERR2.2

Yes No

Return

Yes No

ERR2.9

Yes

No

Wiring to Gyrocompass is incorrect, correct wiring then re-check. ERR2.8

Yes No

ERR2.9

Synchro Stator AC Voltages The most common stator voltage is 0-90 VAC, however some newer Gyrocompasses have 0-36 VAC outputs. Refer to the manual for the Gyrocompass to ascertain its proper output voltage level. The stator voltages should vary from 0VAC to Peak VAC as the boat turns. Monitor the AC Voltage from S1 to S2 on the Terminal Mounting Strip. Does the AC voltage vary properly from 0-Peak?

- 4-39 -

ERR Step

ERR2.8.2


Results

Is the “Peak” AC voltage level correct?

Yes No Yes No

Monitor the AC Voltage from S2 to S3 on the Terminal Mounting Strip. Does the AC voltage vary properly from 0-Peak? Is the “Peak” AC voltage level correct?

ERR2.8.3

Monitor the AC Voltage from S3 to S1 on the Terminal Mounting Strip. Does the AC voltage vary properly from 0-Peak? Is the “Peak” AC voltage level correct?

ERR2.9

Disconnect ribbon cable from the ACU and retest 2.4.3. Are the Peak voltage levels and variations correct with the ACU disconnected?

At the Gyrocompass distribution box, check output fuse/switch. Is the fuse/switch OK? Check output terminals in the distribution box terminals. Are the Peak voltage levels and variations correct at the Gyrocompass?

- 4-40 -

Yes No Yes No Yes No Yes

No Yes No Yes No


ERR2.9 ERR2.9

ERR2.9 ERR2.9

ERR2.9 Replace Synchro Converter PCB and re-check. If still Yes, replace Main PCB, verify all parameters, then ERR2.1

Replace fuse/turn switch ON then next Reconnect all connections and re-test ERR2.1 Repair Gyrocompass and recheck


ERR

Step


ERR3.0

Error Code 0002 – Wrong Synchro Converter Type

Results


Yes No

ERR3.3 ERR3.2

Yes

Set Gyro Type parameter to 0000, then ERR3.8

This error occurs when the “Gyro Type” parameter is set to an incorrect value for the Synchro Converter (daughter board) which is installed on the TAC-92C Main PCB. ERR3.1

Is a ships Gyrocompass being used for heading input to the TAC-92C?

ERR3.2

Fluxgate inputs

ERR3.2.1

Is the internal fluxgate (mounted on the antenna pedestal) being used for heading input to the TAC-92C?

ERR3.2.2

Is an external fluxgate device being used for heading input to the TAC-92C? Check the version of the TAC-92C software being used. Is the TAC-92C software version 2.77 or greater?

ERR3.3

No

ERR3.1 Set Gyro Type parameter to 0002, then ERR3.8 Set Gyro Type parameter to 0000, then ERR3.8

Verify the type of output from the Ships Gyrocompass. Is the Gyrocompass output NMEA-0183 Heading? Check the version of the TAC-92C software being used. Is the TAC-92C software version 2.77 or greater?

ERR3.3.1

No Yes No Yes

Is the Gyrocompass output Step-By-Step?

Yes No Yes No Yes

ERR3.3.1 Set Gyro Type parameter to 0002, then ERR3.8 Set Gyro Type parameter to 0000, then ERR3.8 Set Gyro Type parameter to 0002, then ERR3.8

No Is the Gyrocompass output Synchro (1:1, 36:1, 90:1 or 360:1)? ERR3.4

Open the top cover of the TAC-92C and verify the type of synchro converter installed on the Main PCB. The synchro converter (daughter board) is plugged into the two 20-pin header strips on the left side of the main PCB, near the rear, partially under the ASPA boards. Is a synchro converter installed?

- 4-41 -

Yes No Yes

ERR3.4 ERR3.3 ERR3.5

No

Contact Sea Tel sales department to procure an appropriate Synchro Converter PCB to install.

ERR Step


Results

Is the PN 112790 360:1-To-SBS Synchro Converter PCB (shown above) installed?

Yes No Yes No Yes No Yes No Yes


ERR3.5

Is the Gyrocompass output 1:1 Synchro? Is the Gyrocompass output 36:1 Synchro? Is the Gyrocompass output 90:1 Synchro? Is the Gyrocompass output 360:1 Synchro?

No

ERR3.6 ERR3.7 ERR3.7 ERR3.7 Set Gyro Type parameter to 0360, then ERR3.8 ERR3.3

ERR3.6

Is the PN 114836 12-Bit S/D Synchro to Digital Converter PCB (shown above) installed? Is the Gyrocompass output 1:1 Synchro?

Yes No

ERR3.4

Yes

Set Gyro Type parameter to 0001, then ERR3.8


No Yes


No Yes No

- 4-42 -

Set Gyro Type parameter to 0036, then ERR3.8 Set Gyro Type parameter to 0090, then ERR3.8


ERR


Results



Yes No

Set Gyro Type parameter to 0362, then ERR3.8 ERR3.3

Yes No

ERR3.1 Return

ERR3.7

Contact Sea Tel Service department Sea Tel sales dept to procure a 12-bit S/D Synchro to Digital Converter PCB (PN 114836) to install.

ERR3.8

Press MODE repeatedly until “Save Parameters” is selected. Press the UP arrow, then press ENTER to save the new Gyro Type. Clear the error and monitor the system for reoccurrence. Does the error 0002 re-occur?

- 4-43 -

ERR


Step


Results

ERR4.0

Error Code 0004 –Communications error


This error indicates an RS422 communications error between the TAC-92C Antenna Control Unit and the Antenna Pedestal Control Unit. This error will be indicated when the power-up display of the TAC-92C reports “Remote Not Responding”.

ERR4.1

ERR4.2

Refer to the Antenna Control Cable and Antenna System Schematic drawings for all voltage and continuity testing. Clear this error and monitor the system for reoccurrence. Does this error code and Remote Not Responding re-occur?

Return

Check to assure that the antenna control cable connections are properly connected. Visually inspect each connection. Caution: Prior to re-seating any of the connections turn TAC-92C power OFF, re-seat the connection and then turn power back ON. Is the antenna control cable plugged into J1 on the rear panel of the TAC-92C properly? Is the antenna control cable plugged into the 9-pin circular jack on the bracket mounted inside the base-pan of the radome? Is the antenna control cable connection (P2) plugged into J2 on the PCU? Were any connections loose in the previous three steps?

ERR4.3

Yes No

Clear this error and monitor the system for reoccurrence. Does this error code and Remote Not Responding re-occur? DC voltage checks Open the back-shell of P2 and check DC voltage from P2-15 to ground under load. Is the +24VDC OK? Monitor the voltage from P2-15 to ground and unplug P1 from the Pol Aux Relay PCB. Is the P2-15 +24VDC OK? Monitor the voltage from P2-15 to ground and unplug P1 from PCU. Is the P2-15 +24VDC OK? Monitor the voltage from P2-15 to ground and unplug P2 from PCU. Is the P2-15 +24VDC OK?

- 4-44 -

Yes No Yes No Yes No Yes No Yes No

Yes

Caution re-seat connection Caution re-seat connection

Caution re-seat connection ERR4.3 ERR4.3 Return

ERR4.4

No Yes No Yes No Yes No

Pol/Feed short – isolate, repair and re-check ERR4.3 Pedestal short – isolate, repair, and re-test ERR4.3 PCU short – isolate, repair, and re-test ERR4.3


ERR


Results


Unplug the 9-pin Circular plug from the bracket in the base-pan of the radome. Check the DC voltage from pin 9 to pin 5. Is the +24VDC OK? Unplug P1 from the rear panel of the ACU and check the DC voltage from J1-9 to J1-5. Is the +24VDC OK?

Yes

Spool cable – SPOOL1.0 then re-test ERR4.3

No Yes No

ACC1.0 then re-test ERR4.3

Turn TAC-92C power OFF and reconnect all unplugged connections. Turn TAC-92C power ON and re-test 1.3. Is the +24VDC Restored? Clear this error and monitor the system for reoccurrence. Does this error code and Remote Not Responding re-occur? Check continuity of the Antenna Control cable for opens and shorts as outlined in ACC1.1 and ACC1.2. Make repairs as necessary and return to this section. Was the Antenna Control Cable repaired or replaced?

Yes No

TAC1.0

Yes No

ERR4.4 Return

Yes No

ERR4.5

Re-connect the Antenna Control Cable and turn the TAC-92C power ON. When initialization is complete clear this error and monitor the system for re-occurrence. Does this error code and Remote Not Responding re-occur?

Yes No

ERR4.5 Return

Check continuity of the Spooler Cable for opens and shorts as outlined in SPOOL1.1 and SPOOL1.2. Make repairs as necessary and return to this section. Was the Spooler Cable repaired or replaced?

Yes No

ERR4.6

Yes No

ERR4.6 Return

ERR4.6

Re-connect the Spooler Cable and turn the TAC-92C power ON. When initialization is complete clear this error and monitor the system for re-occurrence. Does this error code and Remote Not Responding re-occur? RS422 signal checks

ERR4.6.1

TAC-92C TX data signal checks.

ERR4.4

ERR4.5

Turn TAC-92C power OFF and disconnect P1 from the rear panel. Turn TAC-92C power ON and check the DC voltage from the junction of R44 & C49 to ground on the Main PCB. Press and hold the RESET button on the front panel of the TAC-92C to keep the TX signal at a steady high state. This voltage should be approx. -11VDC. Is the TX signal present? Turn TAC-92C power OFF and re-connect P1 to the rear panel. Turn TAC-92C power ON and re-check the DC voltage from the junction of R44 & C49 to ground on the Main PCB. Is the TX signal present? - 4-45 -

Yes No

Yes No

Replace Main PCB and recheck

Replace PCU and re-check

ERR Step


Results

Clear this error and monitor the system for reoccurrence. Does this error code and Remote Not Responding re-occur? TAC-92C RX data signal checks (also see RX Note below).

Yes No

Check the DC voltage from the U24 pin 2 (+) to E4 (-) on the Main PCB. Press and hold the RESET button on the front panel of the TAC-92C to keep the RX signal at a steady high state. This voltage should be at least 3.0VDC. Is the RX signal present?

Yes No

ERR4.6.4 Replace the PCU, then ERR4.6.3

ERR4.6.3

Re-check the DC voltage from the U24 pin 2 (+) to E4 (-) on the Main PCB as above. This voltage should be at least 3.0VDC. Is the RX signal present now?

Yes No

ERR4.6.4 Replace the Main PCB, reinstall the original PCU and re-check

ERR4.6.4

Verify that the E4/E5/E6 Jumper is shorting E5 to E6. Is the jumper in the correct position?

Yes No

Clear this error and monitor the system for reoccurrence. Does this error code and Remote Not Responding re-occur?

Yes

ERR4.6.2

RX Note

If the system is equipped with Conscan, assure that the 8 value is included in the SYSTEM TYPE parameter and observe the Disk Sensor LED on the Conscan Controller (lower ASPA PCB in the rear panel of the TAC-92C). Activity of the LED’s on the Conscan Controller indicates that the RX signal is present, the jumper is in the correct position and that the Main PCB is processing the RX signal and passing it to the Conscan Controller. This is a very good quick indication of RX processing.

- 4-46 -

No


Return

Correct the jumper position then next Contact Sea Tel Service department Return


ERR

Step


ERR5.0

Error Code 0008 – Pedestal function error Clear this error and monitor the system for reoccurrence. Does this error code re-occur?

Results


Yes

Contact Sea Tel Service department Return

No

- 4-47 -

ERR


Step


Results

ERR6.0

Error Code 0016 – Conscan error


The Conscan Motor Driver PCB generates five 2msec pulses per revolution of the eccentric scalar plate. If the timing of the pulses from the Conscan feed is incorrect (time between pulses exceeds 400 msec) a Conscan Error will be generated. This error code does NOT cause the Error LED to illuminate.

Figure 1 Conscan Pulses This error may be due to: 1. Eccentric scalar plate is not rotating, not rotating fast enough or is starting and stopping rotation. 2. Conscan (Hall) sensor failure. 3. Harness failure. 4. Aux Pol Relay PCB failure. 5. PCU failure. 6. Main PCB failure. 7. ASPA w/con PCB failure. Refer to the Pedestal Harness Schematic and Antenna System Schematic drawings for all voltage and continuity testing. ERR6.1 ERR6.2

Clear this error and monitor the system for reoccurrence. Does this error code re-occur? Conscan Feed Checks Turn tracking OFF. Remove the radome top (or open the radome door) to gain access to the pedestal.

Figure 2 Ku-Band Conscan Feed Assemblies

- 4-48 -

Yes No

Return


ERR6.2.1

ERR


Results

Rotate the antenna pedestal as needed to view the feed assembly. Visually inspect the feed. Is it a Conscan feed assembly?

Yes No

Refer to figure 2, is the antenna fitted with a Conscan modified feed?

Yes No

Figure 3 Conscan Motor Driver PCB Visually inspect the feed and harness connections. Refer to figure 3. Are P1 & P2 plugged in correctly? Are any wires frayed or broken?

ERR6.2.3

Is the eccentric scalar plate rotating continuously CW?

ERR6.2.4

The Conscan drive belt should drive smoothly through both sprockets. The tension of the belt should be only taught enough to prevent the belt from slipping on either sprocket. Is the belt broken? Is the drive belt dragging on either sprocket?

ERR6.2.5

Unplug P2 from the Conscan Motor Driver PCB to stop motor drive. Rotate the eccentric scalar plate by hand. The scalar plate should rotate freely and easily, with no sticky spots or binding in rotation. Does the scalar plate rotate freely?

- 4-49 -

ERR6.2.2 Re-test ERR6.1

Set TAC-92C parameters for Step Track operation and save the parameter changes. EL Step Size = 0002 AZ Step Size = 0002 Step Integral = 0060

ERR6.2.2


Yes No

Re-connect and re-check

Yes No Yes No, starting & stopping or not rotating

Repair and re-check

Yes No Yes

Replace belt then next

No Yes No

ERR6.6

Adjust/bend the motor mounting bracket to allow belt to run smoothly and re-check ERR6.2.6

ERR Step


Results


Loosen the drive motor mounting screws and adjust the motor position to disengage the belt. Rotate the eccentric scalar plate. Is the bearing binding?

Yes


Rotate the drive motor sprocket. Is the motor binding?

No

Yes

Replace drive motor and retest ERR6.2.5

No ERR6.2.6

ERR6.4

Set belt tension by loosening the drive motor mounting screws and adjust the motor position to put only enough tension on the belt to prevent the belt from slipping on either sprocket. Do NOT over tension the belt. Measure the DC voltage on P1 from pin 1 to pin 2. Is the +15VDC OK (>+13VDC)? The sensor pulse voltage will be high (5VDC) until the magnet passes under the hall sensor. When the magnet passes under the Hall sensor the pulse voltage will go to low (0VDC). The transition of the pulse must be at least 3.5VDC. Monitor the pulse voltage from U3 pin 17 to ground on the Conscan Motor Driver PCB while manually rotating the eccentric scalar plate 360 degrees. Is the pulse present (once per rotation)? Check the +12VDC from J2 pin 3 to ground and pin 4 to ground. Is the +12VDC motor voltage OK (>10VDC)? Plug P2 and check continuity of the motor windings measure from: P2-1 to P2-3 or 4 ~38Ù P2-2 to P2-3 or 4 ~38Ù P2-5 to P2-3 or 4 ~38Ù P2-6 to P2-3 or 4 ~38Ù P2-1 to P2-2 ~76Ù P2-5 to P2-6 ~76Ù Is motor winding continuity good? Check continuity of the motor windings to ground: P2-1 to ground = Open P2-2 to ground = Open P2-3 to ground = Open P2-4 to ground = Open P2-4 to ground = Open P2-6 to ground = Open Is the motor shorted? - 4-50 -

Yes No

Yes No

Yes No Yes No

Yes No

ERR6.5

R pulse missing, replace Conscan Motor Driver PCB and re-check

Replace Conscan Motor Driver PCB and re-check Motor open - Replace motor and re-check.

Motor shorted - Replace motor and re-check.


ERR6.5

ERR


Results


Plug P2 back into the Conscan Motor Driver PCB. Is the eccentric scalar plate rotating continuously CW now?

Yes No

ERR6.6 Replace Conscan Motor Driver PCB and re-check

Yes

Replace the Conscan Motor Driver (shorted). Plug P1 in and re-test ERR6.4

+15VDC Checks Unplug P1 from the Conscan Motor Driver and check the +15VDC from P1 pin 1 to pin 2. Is the +15VDC OK (>+13VDC)?

ERR6.5.1

ERR6.5.2

ERR6.5.3

Check the voltage at the Polang Aux Relay PCB from P2 pin 1 to pin 4. Is the +15VDC OK (>+13VDC)? Unplug P2 and check harness continuity from Polang Aux Relay PCB P2 to Conscan Motor Driver P1: P2 pin 1 to P1 pin 1 = Short P2 pin 4 to P1 pin 2 = Short P2 pin 7 to P1 pin 3 = Short Is the harness continuity good? Unplug P2 and check the voltage at the Polang Aux Relay PCB from J2 pin 1 to pin 4. Is the +15VDC OK (>+13VDC)? Check harness continuity from Polang Aux Relay PCB P2 to Conscan Motor Driver P1: P2 pin 1 to P1 pin 2 = Open P2 pin 1 to P1 pin 3 = Open P2 pin 4 to P1 pin 1 = Open P2 pin 4 to P1 pin 3 = Open P2 pin 7 to P1 pin 1 = Open P2 pin 7 to P1 pin 2 = Open P2 pin 1 to Shield = Open P2 pin 4 to Shield = Open P2 pin 7 to Shield = Open Is the harness continuity good? Check the voltage at the Polang Aux Relay PCB from P1 pin 3 to pin 6. Is the +28VDC OK (>+26VDC)? Unplug P1 and check the voltage at the Aux Polang Relay PCB from P1 pin 3 to pin 6. Is the +28VDC OK (>+26VDC)?

No Yes No Yes No

Yes No Yes No

Yes

No Yes

No

- 4-51 -

ERR6.5.2

Repair harness, restore connections and re-test ERR6.4

ERR6.5.3

Repair harness, restore connections and re-test ERR6.4

Replace Polang Aux Relay PCB, re-connection & re-test ERR6.4 Replace Polang Aux Relay PCB (shorted), restore connections and re-test ERR6.4

ERR Step


Results

Turn TAC-92C power OFF and unplug P2 from the PCU. Test harness continuity from Polang Aux Relay P1 to PCU P2: P1 pin 1 to P2 pin 3 = Short P1 pin 2 to P2 pin 2 = Short P1 pin 3 to P2 pin 9 = Short P1 pin 4 to P2 pin 1 = Short P1 pin 5 to P2 pin 10 = Short P1 pin 6 to P2 pin 12 = Short Is the harness continuity good? Test harness continuity from Polang Aux Relay P1 to PCU P2: P1 pin 1 to P2 pin 2 = Open P1 pin 1 to P2 pin 9 = Open P1 pin 1 to P2 pin 1 = Open P1 pin 1 to P2 pin 10 = Open P1 pin 1 to P2 pin 12 = Open P1 pin 2 to P2 pin 9 = Open P1 pin 2 to P2 pin 1 = Open P1 pin 2 to P2 pin 10 = Open P1 pin 2 to P2 pin 12 = Open P1 pin 3 to P2 pin 1 = Open P1 pin 3 to P2 pin 10 = Open P1 pin 3 to P2 pin 12 = Open P1 pin 4 to P2 pin 10 = Open P1 pin 4 to P2 pin 12 = Open P1 pin 5 to P2 pin 12 = Open P1 pin 1 to Shield = Open P1 pin 2 to Shield = Open P1 pin 3 to Shield = Open P1 pin 4 to Shield = Open P1 pin 5 to Shield = Open P1 pin 6 to Shield = Open Is the harness continuity good? Were harness repairs made in either of the previous two steps?

Yes No


Yes No


Yes

No

- 4-52 -


Restore connections, turn TAC-92C power ON and retest ERR6.4 Replace the PCU, restore connections, turn TAC-92C power ON and re-test ERR6.4


ERR

Step


Results

ERR6.6

TAC-92C Checks

ERR6.6.1

Check TAC-92C parameters to assure they are set for Conscan operation: EL Step Size = 0003 AZ Step Size = 0003 Step Integral = 0000 System Type = 8, 12, 72 or 76 Are these parameters correct?

Yes No

Remove the cover of the TAC-92C. Inspect the cable that connects the ASPA PCBs (J11 & J13) to the Main PCB. Is the cable connected properly? Are interconnect cable wires frayed or broken?

Yes No

Check JP3 jumper on the Main PCB. Is the jumper in the correct position (shorted)?

ERR6.7

ERR6.7.1

Observe the LEDs mounted on the ASPA w/Conscan PCB (J11 in the Rear Panel). Is the DISK LED rapidly flashing? Conscan Pulse Checks An oscilloscope must be used for the following checks. Turn TAC-92C power OFF. Install the 15-Pin In-Line Test-Point connector between P2 and the PCU. Check continuity from the test adapter pin 2 to ground. Is the Conscan pulse line shorted?


Enter correct values, save parameter changes then retest ERR6.1

Reconnect, then next.


Repair/replace, then next.

Yes

Isolate short and repair, then re-check

Short jumper, then next. ERR6.1

No

Check continuity from the test adapter pin 2 to Conscan Motor Driver J1 pin 3 (wht/grn). Is the Conscan pulse line continuity OK (short)?

Yes No

Turn TAC-92C power OFF. Install the 15-Pin In-Line Test-Point connector between P2 and the PCU. Turn TAC-92C power ON. Refer to figure 1 and view the signal on P2 pin 2. Are the Conscan pulses present? View the signal at Polang Aux Relay PCB P1 pin 2. Are the Conscan pulses present?

Yes No

ERR6.7.2

Yes

Repair PCU to Polang Aux Relay harness open and retest ERR6.7.1

View the signal at Polang Aux Relay PCB P2 pin 7. Are the Conscan pulses present?

No Yes

No

- 4-53 -

Isolate open and repair, then re-check

Replace Polang Aux Relay PCB (open) and re-test ERR6.7.1

ERR Step

ERR6.7.2

ERR6.7.3


Results


View the signal at Conscan Motor Driver PCB P1 pin 3. Are the Conscan pulses present?

Yes

Repair Polang Aux Relay to Conscan Motor Driver harness open and re-test ERR6.7.1

At the TAC-92C, open JP3. View signal at JP3. Are the Conscan pulses present on either pin of JP3? Turn TAC-92C power OFF, remove the 15-Pin In-Line Test-Point connector between P2 and the PCU. Replace PCU and turn TAC-92C power ON. Are the Conscan pulses present on either pin of JP3 now? Turn TAC-92C power OFF, replace Main PCB and turn TAC-92C power ON. Are the Conscan pulses present on either pin of JP3 now?

No Yes No

ERR6.7.3

Yes No

ERR6.7.3

Yes No

ERR6.7.3

Turn TAC-92C power OFF, replace J11 ASPA w/CON PCB and turn TAC-92C power ON. Are the Conscan pulses present on either pin of JP3 now?

Yes No

ERR6.7.3

Turn TAC-92C power OFF, replace J13 ASPA and turn TAC-92C power ON. Are the Conscan pulses present on either pin of JP3 now? View the signal at P12 pin 9. Are the Conscan pulses present?

Yes No

ERR6.7.3 Contact Sea Tel Service department

Yes

Hard wired Conscan, leave JP3 open Short JP3 Serial Conscan leave JP3 shorted Replace Main PCB and retest ERR6.7.3

View the signal at P12 pin 9. Are the Conscan pulses present now?

No Yes No

View the signal at TP2 on the J11 ASPA w/CON PCB. Are the Conscan pulses present?

Yes No

Observe the DISK LED on the J11 ASPA w/CON PCB. Is the LED rapidly flashing?

Yes

- 4-54 -

No

Replace ASPA interconnect cable and re-check. ERR6.1 Replace J11 ASPA w/CON PCB and re-check


ERR

Step


ERR7.0

Error Code 0032 – Reserved for future use Clear this error and monitor the system for reoccurrence. Does this error code re-occur?

Results


Yes


No

- 4-55 -

ERR


Step


ERR8.0

Error Code 0064 – Reserved for future use Clear this error and monitor the system for reoccurrence. Does this error code re-occur?

Results


Yes


No

- 4-56 -


ERR

Step


Results

ERR9.0

Error Code 0128 – Satellite Out Of Range


Calculated elevation of the desired satellite is below the horizon from the present Latitude and Longitude (therefore, the Earth itself will block the signal from that satellite). This error will occur when the desired satellite (SAT) longitude is too distant from the present Longitude of the boat. It will also occur when one, or more, of the entries (LAT, LON and/or SAT) has not been entered properly. The most common mistakes are not updating the LAT/LON entries and incorrect E/W settings. ERR9.1 ERR9.2

ERR9.3

ERR9.4

ERR9.5

Clear this error and monitor the system for reoccurrence. Does this error code re-occur? Check Latitude (LAT) entry to assure it is correct form the current location of the boat. Is the Latitude entry correct? Assure that the North/South (N/S) portion of the Latitude is set correctly for the hemisphere that the boat is located in. Is the Latitude N/S entry correct? Check Longitude (LON) entry to assure it is correct form the current location of the boat. Is the Longitude entry correct? Assure that the East/West (E/W) portion of the Longitude is set correctly for the hemisphere that the boat is located in. Is the Longitude E/W entry correct? Check Satellite Longitude (SAT) entry to assure it is correctly entered for the satellite you desire to target. Is the Satellite Longitude entry correct? Assure that the East/West (E/W) portion of the Satellite Longitude is set correctly for the desired satellite. Is the Satellite Longitude E/W entry correct? If the absolute difference between the LON and SAT entries is greater than 50 degrees the satellite may be below the horizon. Is the difference between LON and SAT greater than 50 degrees? Calculate the elevation of the desired satellite from the present latitude and longitude (use SatCoDX web site or Contact Sea Tel Service department Sea Tel to calculate). Is the sat below horizon?

- 4-57 -

Yes No Yes No

Return Correct the entry, then next

Yes No

Correct the entry, then next

Yes No


Yes No


Yes No


Yes No


Yes No

ERR9.1

Yes No

Use another satellite ERR9.1

FLUX


Step


FLUX1.0

Fluxgate PCB failure

Results


Yes


Common indications are: 1. Heading error greater than +/- 10 degrees. 2. Remote Compensation resulted in a “Comp Range Error”. Refer to the Antenna System Schematic and the Pedestal Harness Schematic drawings for all voltage and continuity checks. FLUX1.1

Turn TAC-92C power OFF and remove radome top (or open the radome door): Disconnect P1 from the PCU and visually inspect P1. Are any pins bent, broken or pushed into the body of the connector? Is the IDC connection (P14) mated properly on the Fluxgate PCB? Are any wires in the IDC connector (P14) broken or frayed?

No Yes No Yes No

Re-mate connection and recheck Repair and re-check.

FLUX1.2

Fluxgate Sensor continuity Yes

FLUX1.2

Turn TAC-92C power OFF. Disconnect P14 from the Fluxgate PCB. Measure continuity of the Fluxgate device from J14: Pin 1 to pin 2 ~ 1 ohm Pin 3 to pin 4 ~ 140 ohms Pin 4 to pin 5 ~ 140 ohms Is continuity OK? Harness continuity Disconnect P1 from the PCU and measure continuity from: P14-1 to P1-6 or 22 Short P14-2 to P1-6 or 22 Short P14-3 to P1-24 Short P14-4 to P1-16, 17 or 31 Short P14-5 to P1-39 Short Is the harness continuity good? Were repairs made to the harness in the previous step?

Yes No

Repair and re-check

Yes

COMP1.0

No

Replace the PCU, then COMP1.0

- 4-58 -

No

Replace the Fluxgate PCB, then COMP1.0


HOME

Step


Results

HOME1.0

Home Sensor / Home Flag


Home sensor read error may cause: 1. During initialization elevation does not stop when reaching correct angle (where level cage is approximately level) 2. Elevation motor moves the antenna up 3. Antenna does not stop, or change speed at the horizon. Refer to the Antenna System Schematic and the Pedestal Harness Schematic drawings for all voltage and continuity checks. HOME1.1

Figure 1 Level cage and Home Flag Turn the TAC-92C power OFF. Remove the radome top (or open the radome door) to gain access to the pedestal. Rotate the level cage through its 90 degree range of rotation. The level cage should rotate freely and easily with light finger pressure. Does the level cage rotate freely? Assure that the cables in the area are not restricting or binding the free rotation of the level cage. Is there cable restriction noted?

Yes No

Yes

Contact Sea Tel Service department Re-route or tie cables away from the level cage and recheck.

No Check the drive belt. Is the belt broken or loose? Is the 44 pin connector (P1) properly mated to the PCU?

Yes No Yes No

Are the harness and motor IDC connections to J15 & J16 mated properly on the level platform PCB

Yes

Are the wires in the IDC connectors (P15 & P16) broken or frayed?

Yes

Is the home flag cam tight on the shaft?

- 4-59 -


No

No Yes No

Re-mate connection and recheck Re-mate connection and recheck Repair and re-check.


HOME


Step


Results


HOME1.2

Home Flag signal Rotate the level cage to be about level. Monitor the DC voltage from J16 pin 1 to ground as the level cage is rotated slightly CW/CCW from the level position. The Home Flag DC voltage should change from 0VDC to 5VDC. Does the Home Flag voltage change at some point of rotation near level? Home sensor fault

Yes No

HOME1.4

HOME1.3

Measure the DC voltage from J16 pin 5 to ground. Is the 5VDC OK?

Yes

Replace the level platform PCB and re-test HOME1.2

No HOME1.4

Harness Continuity

HOME1.4.1

Turn TAC-92C power OFF. Disconnect P1 from the PCU and visually inspect P1. Are any pins bent, broken or pushed into the body of the connector? Disconnect P16 from the level platform PCB and check continuity from: P16-1 to P1-1 = Short P16-3 to P1-38 = Short P16-5 to P1-17 = Short Is continuity good? Check continuity from: P16-1 to ground = Open P16-3 to ground = Open P16-5 to ground = Open P16-1 to P16-3 = Open P16-1 to P16-5 = Open P16-3 to P16-5 = Open Is harness shorted?

HOME1.4.2


- 4-60 -

Yes


No Yes No


Yes

Repair and re-check

No

Yes

HOME1.2

No

Replace PCU and re-test HOME1.2



INIT1.0

Antenna Initialization

INIT Results


Initialization Test - Each time power to the system is cycled the antenna will go through a specific sequence of steps (listed below) to initialize the antenna. These phases initialize azimuth, the level cage, elevation and crosslevel to predetermined starting positions. Initialization takes about two minutes. NOTE: Some of the actions of the antenna during initialization occur simultaneously, when trying to isolate failures it may be necessary to cycle power several times to view each of these phases independently. INIT1.1

Setup – Turn the TAC-92C power OFF and remove the radome top (or open the radome hatch on larger systems).

INIT1.1.1

Visually inspect the inside surface of the radome top and of the antenna pedestal. Look for water or condensation, rust or corrosion, white fiberglass power residue, loose wiring connections, loose hardware, loose or broken belts or any other signs of wear or damage.

Inspection OK

Rotate the antenna in azimuth until it is pointed toward the bow. Rotate elevation of the antenna UP to zenith (90 degrees). Rotate the level cage fully CW to the stop. Tilt the antenna off-level (left/right) about 10 degrees.

Rotation OK

INIT1.1.2

INIT1.1.3

Have someone turn TAC-92C power ON and carefully observe each of the initialization phases of the antenna during “power-up” cycle to verify that each phase completes correctly. This information assists in isolating a problem. NOTE: Sun reflecting into the level cage may adversely affect the initialization of the level cage. Shield the sun penetration with your hands during the first 30 seconds of initialization.

- 4-61 -

Items noted

Mechanical Binding is noted

VIS1.0

ROM1.0

INIT


Step


INIT1.2

Initialization phases

INIT1.2.1

The antenna will rotate CW in azimuth to the mechanical stop (antenna should now be pointing to the port side). The antenna will “tick” against the CW stop for several seconds. Does this phase complete correctly?

INIT1.2.2

INIT1.2.3

INIT1.2.4

Results

The level cage rotates full CCW and “ticks” against the stop for several seconds. Then the level cage will rotate CW to 15° (2094), 25° (2494) or 5° (3294, 4094 & 4894). Does this phase complete correctly?

The elevation motor drives the equipment frame to bring the level cage to level (front to back) which results in the elevation of the dish subsequently being at 15° (2094), 25° (2494) or 5° (3294, 4094 & 4894) up from the horizon. Elevation should drive quickly bring the level cage to approximately level where it will abruptly change speed to slowly bring the level cage to level. Does this phase complete correctly?

The cross level motor smoothly drives to approximately “level” the cross level beam (and the level cage) in left-to-right tilt. Does this phase complete correctly?

- 4-62 -

Yes Yes, but antenna was not pointed to the port side. No, it did not rotate. No, it only turned CW about 60 degrees. No, antenna rotated CCW after initialization Yes No level cage did not drive No, level cage drives the wrong direction Yes


MINST1.0

AZD1.0 ENC1.0

ENC1.0

LEV1.0 LEV1.0

No elevation drive.

ELD1.0

No, elevation does not stop when reaching correct angle (where level cage is approximately level). No, antenna reaches this position momentarily then drives to the upper or lower stop(s) Yes

HOME1.0

No cross level drive or drive “jerks” the beam No, cross level drives to the left or right stop(s)

CLD1.0

ELR1.0 and TILT1.0

CLR1.0 and TILT1.0


INIT

Step


Results

INIT1.2.5

During the two minute initialization period cross level and elevation should continue to slowly bring the level cage to “level” in both the left-right and the front-back axes. Is the level cage “level” +/- 2 degrees?

Yes

INIT1.3

Initialization completed. Did initialization complete satisfactorily?

- 4-63 -


No, level cage is not level or does not stay level during antenna motion. Yes

TILT1.0

No, system keeps going into initialization No, ACU displays “Remote Not Responding”

VoltSel1.0

Return

ERR4.0

LEV


Step


Results

LEV1.0

Level Cage Drive problems


Loss of proper level cage drive could be due to belt, motor or harness failure or due to mechanical binding. This directly affects proper Elevation operation of the antenna (pointing, tracking and stabilization). Refer to the Pedestal Harness Schematic and Antenna System Schematic drawings for all voltage and continuity testing. Turn the TAC-92C power OFF. Remove the radome top (or open the radome door). LEV1.1

Rotate the level cage through its 90 degree range of rotation. The level cage rotate freely and easily with light finger pressure. Does the level cage rotate freely?

Yes No

Assure that the cables in the area are not restricting or binding the free rotation of the level cage. Is there cable restriction noted?

Yes

Check the drive belt. Is the belt broken or loose? Is the 44 pin connector (P1) properly mated to the PCU?

LEV1.2

No Yes

Contact Sea Tel Service department Re-route or tie cables away from the level cage and recheck. Replace or re-tension the belt and re-check.

No Yes No


Are the harness and motor IDC connections to J12 & J13 mated properly on the terminal board (TB4)?

Yes No


Are the wires in the IDC connectors (P12 & P13) broken or frayed?

Yes

Repair and re-check.

Level cage drive test: Turn the TAC-92C power ON and observe the level cage while the antenna is initializing (CCW to the stop, then CW the correct number of degrees for the model of the antenna), or while stepping, slewing or targeting elevation (cage rotates CW to increase elevation, CCW to lower elevation). Is level cage drive restored?

- 4-64 -

No Yes No, level cage drives the wrong direction No drive

Return LEV1.6



LEV1.3

+12VDC test

LEV

Check DC voltage from J12 and J13 pin 3 to ground and pin 4 to ground. Is the +12.0 VDC OK?

LEV1.4

Results


Yes > 11VDC

LEV1.4

No, voltage is low or missing

LEV1.7



Motor (M4) Continuity Disconnect P13 and check continuity of the motor windings (note: P13-3 and P13-4 may be transposed on some motors), measure from: P13-1 to P13-3 or 4 ~38Ù P13-2 to P13-3 or 4 ~38Ù P13-5 to P13-3 or 4 ~38Ù P13-6 to P13-3 or 4 ~38Ù P13-1 to P13-2 ~76Ù P13-5 to P13-6 ~76Ù Is motor winding continuity good? Check continuity of the motor windings to ground: P13-1 to ground = Open P13-2 to ground = Open P13-3 to ground = Open P13-4 to ground = Open P13-4 to ground = Open P13-6 to ground = Open Is the motor shorted?

Yes No

Reconnect P13. Re-test level cage drive. Is level cage drive restored?

Yes

LEV1.5

Harness Continuity

LEV1.5.1

Turn TAC-92C power OFF Disconnect P1 from the PCU and visually inspect P1. Are any pins bent, broken or pushed into the body of the connector?

- 4-65 -

Yes

Motor open - Replace motor and re-check.

Motor shorted - Replace motor and re-check.

No

Return

No

Yes No


LEV Step

LEV1.5.2


Results


Disconnect P12 from TB4 and check continuity from: P12-1 to ground = Open P12-2 to ground = Open P12-4 to ground = Open P12-5 to ground = Open P12-6 to ground = Open P12-1 to P12-2 = Open P12-1 to P12-4 = Open P12-1 to P12-5 = Open P12-1 to P12-6 = Open P12-2 to P12-4 = Open P12-2 to P12-5 = Open P12-2 to P12-6 = Open P12-4 to P12-5 = Open P12-4 to P12-6 = Open P12-5 to P12-6 = Open Is harness shorted? Check continuity from: P12-1 to P1-13 = Short P12-2 to P1-11 = Short P12-4 to P1-41 = Short P12-5 to P1-9 = Short P12-6 to P1-21 = Short Is continuity good? Were repairs made to the harness in the previous three steps?

Yes

Repair and re-check

Replace PCU (failed drivers), re-connect all cables and turn TAC-92C power ON. Is level cage drive restored? LEV1.6

No

Yes No


Yes No Yes

LEV1.2

No


Return

Level Cage drives wrong direction Verify motor wire color code to P13 per Pedestal Harness Schematic. Is the P13 wired correctly? Verify correct software in PCU. Is the software correct for the antenna model?

Yes No


Yes No

LEV1.7


LEV1.7.1

Is the +12.0 VDC approximately half the nominal voltage?

- 4-66 -


Yes No

Yes No

Replace PCU software with correct version and re-check LEV1.5 Replace motor and re-test LEV1.2

LEV1.7.3


LEV1.7.2

LEV1.7.3

LEV


Results

Check the Voltage Select/Fuse block in the power module on the rear panel of TAC-92C. Is it set for the correct AC line voltage?

Yes No

Re-check DC voltage from J12 and J13 pin 3 to ground and pin 4 to ground. Is the +12.0 VDC OK now?

Yes > 11VDC

Disconnect P13 from TB4 and check +12VDC from J12 pin 4 to ground. Is the +12.0 VDC OK?

Yes

Disconnect P12 from TB4 and check +12VDC from P12 pin 4 to ground. Is the +12.0 VDC OK? Disconnect P1 from the PCU and check the DC voltage From J1 pins 40, 41, 42, 43 and 44 to ground. Is the +12.0 VDC OK? Turn TAC-92C power OFF and reconnect P1, P12 and P13. Turn TAC-92C power ON and re-check DC voltage from J12 and J13 pin 3 to ground and pin 4 to ground. Is the +12.0 VDC OK? LEV1.7.4

LEV1.7.5

LEV1.7.6


Set for correct AC voltage then next Re-test LEV1.2

No

No Yes No Yes No Yes

Motor short – Replace motor then LEV1.7.2 TB4 short - Repair/replace TB4, then LEV1.7.2 Harness open/short LEV1.5.1 then next LEV1.7.4 LEV1.7.2

No


Check DC voltage from P2-15 to ground under load. This may also be done by opening the back-shell of P2 to access pin 15 OR by opening the PCU and access on U14 pin 5. Is the voltage +24VDC or greater?

Yes

+12VDC regulator failure Replace PCU then LEV1.8


Yes

Unplug P2, remove the 15-Pin In-Line TestPoint connector from PCU and check the voltage from P2-15 to ground. Is the voltage +26VDC or greater? Unplug the 9-pin Circular plug from the bracket (jack) in the base-pan of the radome. Check the DC voltage at the plug from pin 9 to pin 5. Is the voltage +26VDC or greater? Unplug P1 from the rear panel of the ACU and check the DC voltage from J1-9 to J1-5. Is the voltage +26VDC or greater?

Yes


- 4-67 -

No


No Yes


No PCU short – replace PCU, then LEV1.8

No Yes

Spool cable – SPOOL1.0 then LEV1.8

No Yes No

ACC1.0 then LEV1.8

LEV Step

LEV1.7.7

LEV1.8


Results


Remove top cover of the TAC-92C and test DC voltage from Main PCB connector J5-3 to ground. Is the voltage +26VDC or greater?

Yes

Loss of +28VDC path – Replace Main PCB then LEV1.8

Turn the TAC-92C Power OFF, unplug the AC line cord from the rear panel and extract the voltage select block. Test both fuses (250V 2Amp Slow-Blow). Are BOTH fuses good? Re-insert the voltage select block (assure it is in the correct orientation for the AC line voltage) and re-install the AC line cord. Turn TAC-92C power ON and test DC voltage from Main PCB connector J5-3 to ground. Is the voltage +28VDC restored (> +26VDC)? Turn TAC-92C power OFF and reconnect all unplugged connections. Reinstall ACU & PCU covers as necessary. Turn TAC-92C power ON and re-check DC voltage from J4 and J5 pin 3 to ground and pin 4 to ground. Is the +12.0 VDC OK now?

- 4-68 -

No Yes No


Yes

LEV1.8

No

TAC1.0 then LEV1.8

Yes > 11VDC

Re-test LEV1.2

No




MINST1.0

Mechanical Installation

MINST1.1

MINST1.2

MINST Results

When the radome is properly installed, the center of the mechanical range of rotation of the antenna pedestal will be aligned/oriented in-line with the bow of the boat (+/- 5 degrees). To accurately target satellites, any misalignment of the antenna must be added to/subtracted from the magnetic variation and entered in the AZ TRIM parameter. Turn TAC-92C power OFF and remove radome top (or open the radome door): Rotate the antenna full CCW. Is the antenna now pointed directly to the starboard side of the boat?

Yes No

Rotate the antenna CW 270 degrees. Is the antenna now pointed directly in-line with the bow?

Yes No

Rotate the antenna full CW (another 270 degrees CW). Is the antenna now pointed directly to the port side of the boat?

Yes No

Is there mounting error?

Yes No

Note amount of mounting error CW/CCW Note amount of mounting error CW/CCW Note amount of mounting error CW/CCW MINST1.2 MINST1.4

Mounting error If the amount of error is small (5 degrees) it should be documented and adjusted using AZ TRIM parameter. Any error can be adjusted this way, but it may be preferred to re-orient the mounting of the radome to minimize the amount of mounting error. Is the mounting error < +/- 5 degrees? Will the radome mounting be re-oriented to minimize the error?

MINST1.3


Calculating AZ TRIM with mounting error Note the sign (+/-) of the mounting error noted in the previous step (all three positions will have been off the same direction and the same amount). CW values will be a positive number and CCW values will be negative. Annotate this mounting error in your manual for future reference. Note the magnetic variation for the present geographic location of the boat.

- 4-69 -

Yes No

MINST1.3

Yes

Re-orient and re-test MINST1.1

No, use the existing error

MINST1.3

MINST


Step


Results

MINST1.4

Add the Mounting Error and the Magnetic Variation. Multiply the sum of these two values by 10. Enter this calculated value into the AZ TRIM parameter. When entering a negative number, key the numeric value in using the numeric keypad, then press the N/S/E/W key (to make it a minus value), then press the ENTER key. Be sure to save this new parameter setting. Calculating AZ TRIM (NO mounting error)

Action to take - step to go to Return

Note the magnetic variation for the present geographic location of the boat. Multiply this value by 10. Enter this calculated value into the AZ TRIM parameter. When entering a negative number, key the numeric value in using the numeric keypad, then press the N/S/E/W key (to make it a minus value), then press the ENTER key. Be sure to save this new parameter setting.

- 4-70 -

Return



ROM1.0

Range of Motion

ROM

Turn TAC-92C power OFF and remove radome top (or open the radome door): Inspect inside of radome for signs that the dish or feed have been rubbing against the inside of the fiberglass radome. Are there signs of rubbing? ROM1.1

ROM1.2

Rotate the pedestal through 540 degree range of azimuth motion. The antenna should rotate freely and easily with light finger pressure. Do the azimuth bearings rotate freely with no binding in Azimuth? Assure that the cables in the base of the radome are not restricting or binding the free rotation of the pedestal. Is there cable restriction noted? Check the azimuth drive belt. Is the belt broken or loose? Rotate the pedestal through full range of elevation rotation. The antenna should rotate freely and easily with light finger pressure. Does the elevation rotate freely with no binding? Assure that the cables on the pedestal are not restricting or binding the free rotation of the equipment frame. Is there cable restriction noted? Check the elevation drive belt. Is the belt broken or loose?

ROM1.3

ROM1.4

ROM1.5

Rotate the antenna in azimuth and elevation, all around inside the radome to assure that the dish and/or feed do not rub at any hemispheric point against the inside surface of the radome top. Is any rubbing noted? Tilt the antenna off-level (left/right) through the full range of cross level motion (+/- approx. 30 degrees). . The antenna should rotate freely and easily with light finger pressure. Does cross level rotate freely with no binding? Rotate the level cage through the full 90 degrees of rotation from CCW stop to CW stop. The level cage antenna should rotate freely and easily with light finger pressure. Attached cables should not cause the cage to spring back more that a few degrees from either stop when released. Does cross level rotate freely with no binding?

- 4-71 -

Results


Yes No

ROM1.3

Yes No

Yes


Re-route or tie cables away from pedestal and re-check.

No Yes No Yes No

Yes


Contact Sea Tel Service department Re-position cables for sufficient slack and re-check.

No Yes No Yes

Replace or re-tension the belt and re-check. Contact Sea Tel Service department

No

Yes No

Yes No


Return Contact Sea Tel Service department

SIG


Step


SIG1.0

RF/IF Signal Distribution Problems

SIG1.1

TAC-92C setup

Results


Yes

SIG1.3

No

SIG1.6

Use the Quick Start guide in section 2 to assure that LAT, LON & SAT are set correctly. Press sat to view the tracking receiver selection and tuning frequency. This should be set to INA #### or INB #### (lower left) and the AGC (signal level value) should be displayed in the lower right If Gyrocompass input is being used, assure that the TAC-92C heading is set to the present true heading of the boat. If Gyrocompass input is not being used, assure that AZ Trim parameter is set to the correct Magnetic Variation (+/- any mechanical offset). Assure system type set to 64, 68, 72 or 76. Save parameters.

SIG1.2

Target the desired satellite and allow the system to search. Does the TAC-92C acquire & track any satellite (tracking LED ON)?

SIG1.3

Tracking a satellite

SIG1.3.1

Is any programming viewable on any of the receivers (preview or subscription programs)?

Yes

SIG1.4

No

SIG1.6

Assure that there is no blockage between the antenna and the desired satellite causing signal loss. Is there blockage?

Yes

Rotate/move boat to eliminate blockage and re-test SIG1.3.1

SIG1.4

Turn tracking OFF, select Elevation entry, press the UP arrow to step the antenna up OFF satellite and note the AGC value. Press the DOWN arrow to step the antenna down onto satellite, turn tracking ON and allow tracking to peak the satellite signal. Note the peak AGC value. Is the difference in AGC value between Peak and OFF satellite greater that 200 counts? Search for adjacent satellite at higher or lower azimuth/elevation positions. Re-test SIG1.3.1 for each adjacent satellite found. Receiver programming present

- 4-72 -

No Yes No

Satellite signal may be too weak or LNB/LNB has failed.


SIG


Results


Yes No

SIG1.5

At each receiver make the menu selections to display the “signal meter”. If multiple receivers are available, set one receiver to “Transponder 2” and another to “Transponder 1” for a quick check of system performance. Each receiver must be tested buy changing transponders to display the signal level of both even and odd transponders. This will check both LNB inputs to the matrix switch. If the system is fitted with a Linear feed, optimize the polarization of the feed. Is there signal level displayed on both the odd and even transponders on any one of the receivers? Even or Odd transponder signal level only? SIG1.5

SIG1.8

IF OK System is on the correct satellite and signal level is available on a receiver. If the signal level is too low the receiver(s) may not be able to process the programming of some channels. If one receiver is operating all others should also operate. Connect the operating receiver to each of the other receiver outputs on the matrix switch. Does the receiver operate on all other outputs? If any other receiver does not operate, isolate faulty coax(es) or receiver(s).

Yes No

Return

SIG1.6

If subscription services are not available on any of the receivers, Contact Sea Tel Service department service provider for assistance. No satellite tracking Yes No

SIG1.7

Disconnect coax from the TAC-92C and monitor DC voltage at the INA connector. Select INA and tune receiver to 11699, verify that the DC voltage is 12-14VDC (14VDC max). Tune receiver to 11700 and verify DC voltage is 18-21VDC (21VDC max). Is the DC voltage output OK? AGC checks Note the unterminated AGC level. Is the AGC displayed 0000 or 4095?

Yes No Yes No

Connect a spare LNB to INA input connector to indicate amplification level. The AGC should increase dramatically above the unterminated AGC value (>1000 counts). Does the AGC increase dramatically? Reconnect coaxes and re-tune receiver to frequency for desired satellite - 4-73 -

Replace matrix switch and recheck.

DC voltage failure, repair/replace TVRO tuner and re-check

TAC2.0

AGC failure, repair/replace TVRO tuner and re-check

SIG


Step


Results


SIG1.8

Test the DC voltage on the coaxes at the LNB. One coax should 18-21VDC, the other may be 12-14VDC (may be switching between ~13VDC and ~18VDC at 5 sec rate). Is the DC voltage good on both coaxes?

Yes

Replace LNB and re-test SIG1.2 Isolate faulty coax, matrix switch to restore DC voltage to feed, then re-test SIG1.2

- 4-74 -

No



SPOOL1.0

Spooler Cable

SPOOL Results


Inspect the 9-pin Circular jack in the connector bracket mounted in the base-pan of the radome. Are any pins bent, broken or pushed into the body of the connector? Inspect P2 on the PCU. Are any pins bent, broken or pushed into the body of the connector?

Yes


Inspect P1 on the Aux Pol PCB. Are any wires in the IDC connector P1 broken or frayed? Continuity checks

Yes No

Check continuity from P2 to the 9-pin Circular Jack or to the IDC connector P1: P2-1 to P1-4 = Short P2-2 to P1-2 = Short P2-3 to P1-1 = Short P2-4 to N/C P2-5 to Circ-3 = Short P2-6 to Circ-2 = Short P2-7 to Circ-8 = Short P2-8 to N/C P2-9 to P1-3 = Short P2-10 to P1-5 = Short P2-11 to N/C P2-12 to P1-6 = Short P2-13 to Circ-1 = Short P2-14 to Circ-5 = Short P2-15 to Circ-9 = Short P2-metal body to Circ-spade = Short Is continuity good?

Yes No

Refer to Antenna System Schematic SPOOL1.1

SPOOL1.2

Turn TAC-92C power OFF. Visually inspect connections.

- 4-75 -

No Yes

Straighten, reseat or replace pins as needed, then next.

No Repair and re-check.


SPOOL Step


Results


Check continuity from P1-metal body (shield) to P1 pins: P2-1 to Shield = Open P2-2 to Shield = Open P2-3 to Shield = Open P2-4 to Shield = Open P2-5 to Shield = Open P2-6 to Shield = Open P2-7 to Shield = Open P2-8 to Shield = Open P2-9 to Shield = Open P2-10 to Shield = Open P2-11 to Shield = Open P2-12 to Shield = Open P2-13 to Shield = Open P2-14 to Shield = Open P2-15 to Shield = Open Is harness shorted? Check continuity from P2 wires to each other: P2-1 to P2-2 = Open P2-1 to P2-3 = Open P2-1 to P2-5 = Open P2-1 to P2-6 = Open P2-1 to P2-7 = Open P2-1 to P2-9 = Open P2-1 to P2-10 = Open P2-1 to P2-12 = Open P2-1 to P2-13 = Open P2-1 to P2-14 = Open P2-1 to P2-15 = Open P2-2 to P2-3 = Open P2-2 to P2-5 = Open P2-2 to P2-6 = Open P2-2 to P2-7 = Open P2-2 to P2-9 = Open P2-2 to P2-10 = Open P2-2 to P2-12 = Open P2-2 to P2-13 = Open P2-2 to P2-14 = Open P2-2 to P2-15 = Open Continue checking continuity on next page

Yes

Repair and re-check

- 4-76 -

No


SPOOL


Results


Continue checking continuity from P2 wires to each other: P2-3 to P2-5 = Open P2-3 to P2-6 = Open P2-3 to P2-7 = Open P2-3 to P2-9 = Open P2-3 to P2-10 = Open P2-3 to P2-12 = Open P2-3 to P2-13 = Open P2-3 to P2-14 = Open P2-3 to P2-15 = Open P2-5 to P2-6 = Open P2-5 to P2-7 = Open P2-5 to P2-9 = Open P2-5 to P2-10 = Open P2-5 to P2-12 = Open P2-5 to P2-13 = Open P2-5 to P2-14 = Open P2-5 to P2-15 = Open P2-6 to P2-7 = Open P2-6 to P2-9 = Open P2-6 to P2-10 = Open P2-6 to P2-12 = Open P2-6 to P2-13 = Open P2-6 to P2-14 = Open P2-6 to P2-15 = Open P2-7 to P2-9 = Open P2-7 to P2-10 = Open P2-7 to P2-12 = Open P2-7 to P2-13 = Open P2-7 to P2-14 = Open P2-7 to P2-15 = Open P2-9 to P2-10 = Open P2-9 to P2-12 = Open P2-9 to P2-13 = Open P2-9 to P2-14 = Open P2-9 to P2-15 = Open Are any of these harness lines shorted?

Yes

Repair and re-check

- 4-77 -

No

SPOOL Step


Results

Continue checking continuity from P2 wires to each other: P2-10 to P2-12 = Open P2-10 to P2-13 = Open P2-10 to P2-14 = Open P2-10 to P2-15 = Open P2-12 to P2-13 = Open P2-12 to P2-14 = Open P2-12 to P2-15 = Open P2-13 to P2-14 = Open P2-13 to P2-15 = Open P2-14 to P2-15 = Open Are any of these harness lines shorted? Re-connect the three connections

- 4-78 -


Return


TAC

Step


Results

TAC1.0

TAC-92C Power Supply

TAC1.1

The TAC-92C Power-up display should initially show the TAC-92C software version, then “Remote Initializing” for about 2 minutes. After the antenna initializes the remote (PCU) model & software version will be displayed. The TAC-92C Power Supply provides the DC voltages required for normal operation of its circuit boards and the +28 VDC for the Antenna. AC line input checks The AC line input supply must be 110VAC +/10% or 220VAC +/- 10% true RMS. Pseudo AC sources may not provide adequate operation. Check AC line input voltage at the outlet. Is the AC line input voltage OK at the outlet?

TAC1.1.1

TAC1.1.2

TAC1.2

Yes No

Is the AC voltage OK at ACU end of the AC cord?

Yes No

Check the voltage select/fuse block orientation. Is the voltage select set for the correct line voltage?

Yes No

Remove the top cover of the TAC-92C. Turn TAC-92C power ON and measure AC voltage on the barrier strip near the power module. If 110VAC: terminal 1-2 = 110VAC and terminal 3-4 = 110VAC. If 220VAC: terminal 1-2 = 220VAC. Is the AC input voltage OK?

Yes No

Turn power OFF, extract voltage select/fuse block. Test fuses. Fuses OK?

Yes No Yes No

Re insert the voltage select/fuse block (in correct voltage selection). Unplug the power cord and measure continuity from each side of the plug receptacle to the terminal strip. Is continuity of the power module OK? Check continuity of transformer primary and wiring to transformer to isolate shorted primary or wire shorted to ground. Is continuity good? Measure the 40-44 VAC from “~” to “~” on the bridge rectifier. Is the AC voltage into the bridge rectifier OK? Isolate faulty transformer secondary, harness wires or bridge rectifier. Repair and re-test TAC1.1.2 DC supply checks

- 4-79 -


Correct line supply and recheck Replace power cord and recheck Extract and re-insert set for the correct voltage selection TAC1.1.2

Replace fuse(s) then next Replace power module and re-check

Yes No

Re-test TAC1.1.1 Repair and re-check

Yes

TAC1.2

No

TAC


Step


Results


TAC1.2.1

Measure 26-28 VDC from J5-3 to ground. Is the +28 VDC OK?

Yes

TAC1.2.2

Measure 26-28 VDC from the “+” side of the bridge rectifier to ground. Is the +28 VDC OK? Disconnect P5 from the main PCB. Is the +28 VDC OK now? Disconnect IDC plug from the DC-DC converter. Is the +28 VDC OK now?

No Yes No Yes No Yes

Repair harness and re-test TAC1.2.1 Isolate short using TAC1.3 Replace DC-DC converter and re-check

No

TAC1.2.2

Isolate faulty bridge rectifier, shorted filter capacitor or wiring. Repair then re-test TAC1.2.1. Measure 26-28 VDC from J5-4 to ground. Is the –28 VDC OK? Measure 26-28 VDC from the “-” side of the bridge rectifier to ground. Is the –28 VDC OK? Disconnect P5 from the main PCB. Is the –28 VDC OK now?


TAC1.2.3 Repair harness and re-test TAC1.2.2 Isolate short using TAC1.3

Isolate faulty bridge rectifier, shorted filter capacitor or wiring. Repair then re-test TAC1.2.2. TAC1.2.3

Measure the +12 VDC from J5-1 to ground. Is the +12 VDC OK? Disconnect P5 from the main PCB. Is the +12 VDC OK now? Measure the +12 VDC from DC-DC converter pin 3 to ground. Is the +12 VDC OK? Measure the +28 VDC from DC-DC converter pin 2 to ground. Is the +28 VDC OK?

Yes No Yes No Yes No Yes No

TAC1.3

Isolating Short to Main PCB Turn TAC-92C power OFF. With P5 disconnected, inspect all other cable connections on the Main PCB. Are all cables connected correctly? Are any connections frayed or broken? If a NMEA input is connected to J-13 on the rear of the TAC-92C, measure cable continuity for shorted conductors. Repair shorted connection if found then next.

- 4-80 -

TAC1.4 Isolate short using TAC1.3 Repair harness and re-test TAC1.2.3 Replace DC-DC converter and re-test TAC1.2.3 Repair harness and re-check


TAC


Results


If a NMEA/M&C input is connected to J-11 on the rear of the TAC-92C, measure cable continuity for shorted conductors. Repair shorted connection if found then next. Disconnect the Antenna Control Cable, refer to ACC1.0 to check for shorted conductors. Repair shorted connection if found, re-connect Antenna Control Cable, then next. TAC1.3.1

Continuity from J5-1 to ground should not be shorted. Is J5-1 shorted to ground? Disconnect P2 from the NMEA (J-13) PCB. Is J5-1 still shorted to ground?

Yes No Yes No

Disconnect P2 from the NMEA/M&C (J-11) PCB. Is J5-1 still shorted to ground?

Yes No

Disconnect P1 from the TVRO Tuner. Is J5-1 still shorted?

Yes No Yes

Disconnect P8 (display ribbon cable) from the Main PCB. Is J5-1 still shorted?

TAC1.3.2 Repair/replace ASPA NMEA PCB and re-check Repair/replace ASPA w/Conscan NMEA/M&C PCB and re-check

Replace Main PCB and retest TAC1.3.1

No Isolate shorted cable, Front Panel Interconnect PCB or Display Module. Repair/replace faulty component, then re-test TAC1.3.1 TAC1.3.2

Continuity from J5-3 to ground should not be shorted. Is J5-3 shorted to ground? Disconnect P2 from the NMEA (J-13) PCB. Is J5-3 still shorted to ground?

Yes No Yes No


Yes No


Yes No Yes


TAC1.3.3 Repair/replace ASPA NMEA PCB and re-check Repair/replace ASPA w/Conscan NMEA/M&C PCB and re-check


No

TAC1.3.3

Isolate shorted cable, Front Panel Interconnect PCB or Display Module. Repair/replace faulty component, then re-test TAC1.3.2 Continuity from J5-4 to ground should not be shorted. Is J5-4 shorted to ground?

- 4-81 -

Yes No

TAC1.4

TAC Step


Results

Disconnect P2 from the NMEA (J-13) PCB. Is J5-4 still shorted to ground?

Yes No


Yes No


Yes No Yes



Repair/replace ASPA NMEA PCB and re-check Repair/replace ASPA w/Conscan NMEA/M&C PCB and re-check


No

TAC1.4

Isolate shorted cable, Front Panel Interconnect PCB or Display Module. Repair/replace faulty component, then re-test TAC1.3.3 Reconnect P5, turn TAC-92C power ON and check all displays and antenna control functions. Are all displays and functions OK?

- 4-82 -

Yes No

Return Refer to appropriate troubleshooting procedure or module.



TILT1.0

Tilt Sensor

TILT Results


Yes

Remove the PCB, trim leads or replace spacers and reinstall. The tilt sensor may be damaged TILT1.0

Tilt sensor offset errors or drive faults may cause any of the following symptoms; 1. Level cage is not level within +/- 2 degrees in Cross Level or Elevation. 2. Antenna slowly tilts in Cross Level, Elevation or both (may slowly drive to either stop in the affected axis). Refer to the Antenna System Schematic and the Pedestal Harness Schematic for all voltage and continuity checks.. TILT1.1

Turn TAC-92C power OFF and remove radome top (or open the radome door):

No

Fig 1 Level Platform PCB and connections Inspect the tilt sensor PCB to assure that the leads on the under-side of the PCB are not shorted to the level cage enclosure (there should be two plastic spacers between the PCB and the aluminum). Are any leads shorted? Visually inspect the Tilt Sensor. It should be mounted level/flush to the PCB. Is the sensor mounted correctly? Visually inspect the Tilt Sensor. The fluid level (inside the enclosure) should be ¼ to 1/3 full. Is the fluid level OK? Inspect the two 5-pin IDC connectors (J16 has three wires and J15 has five wires). Assure they are plugged in correctly (orientation of the wires, no gaps between connectors or exposed pins on the header). Are the connectors plugged in correctly? Are any wires in the IDC connectors (J15 & J16) broken or frayed?

- 4-83 -

Yes No

Replace

Yes No

Replace

Yes No


Yes No

Repair and re-check

TILT Step


Results

Rotate the level cage through the full 90 degrees of rotation from CCW stop to CW stop. The level cage antenna should rotate freely and easily with light finger pressure. Attached cables should not cause the cage to spring back more that a few degrees from either stop when released. Does cross level rotate freely with no binding?

Yes No

Is the 44 pin connector (P1) properly mated to the PCU?

Yes

TILT1.2

Level check

TILT1.2.1

Turn TAC-92C power ON. After Initialization is complete turn tracking OFF. Place a bubble level on the top of the level cage to evaluate Cross Level and Elevation. Are both axes level and stable now? Is either axis not stable (slowly tilting in case 2 above)? Are both axes stable (not slowly tilting) but not level (case 1 above)?

TILT1.3



No


Yes

Return

No, either not level or not stable. Yes

TILT1.3

No Yes

TILT1.5

No

TILT1.2.1

Continuity checks Turn TAC-92C power OFF. Disconnect P1 from the PCU and P15 from the level platform PCB. Check continuity from: P15-1 to P1-30 = Short P15-2 to P1-15 = Short P15-3 to P1-29 = Short P15-4 to P1-14 = Short P15-5 to P1-2 = Short Is continuity good?

Yes No

Repair and re-check

Check continuity from: P15-1 to P15-2 = Open P15-1 to P15-3 = Open P15-1 to P15-4 = Open P15-1 to P15-5 = Open P15-2 to P15-3 = Open P15-2 to P15-4 = Open P15-2 to P15-5 = Open P15-3 to P15-4 = Open P15-3 to P15-5 = Open P15-4 to P15-5 = Open Is the harness shorted?

Yes

Repair and re-check

No

- 4-84 -


TILT1.4

TILT


Results

Were harness repairs accomplished in either of the two previous steps?

Yes No Yes No

Re-connect P1 & P15. Turn TAC-92C power ON. Is the antenna still slowly tilting in Cross Level, Elevation or both? Tilt Sensor drive voltage checks


TILT1.4 TILT1.4 TILT1.2.1

The Tilt Sensor drive voltages are 0-5V square wave signals that should measure approximately 2.5VDC with a DC Voltmeter. Check voltage from J15-5 to ground ~ 2.5 volt. Is the drive signal present? Check voltages from: J15-1 to ground ~ 2.5 volts J15-2 to ground ~ 2.5 volts J15-3 to ground ~ 2.5 volts J15-4 to ground ~ 2.5 volts Are the drive signals present? Is the antenna still slowly tilting in Cross Level, Elevation or both? TILT1.5

Level Cage is near level and is not slowly tilting -Tilt Sensor offset error Press MODE until the TAC-92C displays REMOTE TILT. Press the UP arrow to enter test mode Press the 4 and 6 keys to adjust Cross Level axis of the Level Cage to within +/- 0.5 degrees. Press the 2 and 8 keys to adjust Level (Elevation) axis of the Level Cage to within +/0.5 degrees. Press the DOWN arrow key to exit test mode. Press the MODE key to display REMOTE PARAMETERS. Press the UP arrow key once then press the ENTER key to save the new offset bias to the PCU.

- 4-85 -

Yes No Yes

Replace PCU and re-check.

No

Replace Level Sensor PCB and re-check.

Yes

Replace PCU and re-check.

No

TILT1.2.1

TILT1.2.1

UNWRAP


Step


UNWRAP1.0

Unwrap LED is lit frequently or constantly

UNWRAP1.1

UNWRAP1.2

UNWRAP1.3

UNWRAP1.4

Results

Antennas shipped after January 1997 do NOT have encoders. These (current) antennas keep track of the relative position of the antenna by counting steps issued to the azimuth motor. When the encoder in an older system fails Sea Tel recommends installation of new PCU to convert to “encoder-less” operation rather than replacing the encoder. Is this antenna “encoder-less”? Loose belt tension, mechanical binding (bearings or cable interference) or drag (rubbing against the inside of the radome top) during azimuth rotation will cause the drive motor to “pulse slip”. When this happens the PCU has issued a step to the azimuth motor, and incremented/decremented the relative position of the antenna, but the pedestal did not actually rotate. The resultant azimuth and heading displays will also be incorrect. As these “missed” steps accumulate the displays become increasingly more inaccurate and the system will not unwrap at the correct positions (5 degrees prior to the mechanical stops). It may not be able to initialize correctly to begin with and will not track or target satellites correctly. Assure that the antenna rotates freely (follow corrective actions in ROM1.0-1.3 for any problems found)

Yes No

If the radome top has been removed, leave it off, turn TAC-92C power ON and observe initialization and operation. Does the antenna still frequently unwrap? If the radome top was removed during the previous step, reinstall it, turn TAC-92C power ON and observe initialization and operation. If the antenna does NOT frequently unwrap with the radome top OFF, but DOES unwrap frequently with the radome top ON, Contact Sea Tel Service department Sea Tel service department for instructions. When the antenna drives to the stops when “A” command is issued OR the antenna does not stabilize in azimuth axis properly the problem may be a rate sensor read error.

Yes No

- 4-86 -


ENC1.0

ROM1.0-1.3

UNWRAP1.4

AZR1.0


VIS

Step


VIS1.0

Visual Inspection

VIS1.1

Setup – Assure that the TAC-92C power is OFF Visually inspect the outside surface of the radome top and base for cracks or other damage. Is any damage found?

VIS1.2

Remove the radome top or open the radome hatch (on larger systems) to visually inspect the inside surface of the radome top and the antenna pedestal.

VIS1.2.1

Are there signs of water or condensation? th

Are the 1/8 inch weep holes in the radome base clogged?

Results


Yes

Contact Sea Tel Service department to report findings.

No

Yes No Yes There are no weep holes

VIS1.2.2 Contact Sea Tel Service department

No

VIS1.2

Yes No

VIS1.2.3

Assure that the weep holes are open to allow the radome to “breathe” and to allow any standing water to leak out. Dry condensation off inner surface of the radome and off the pedestal, dish and feed areas. VIS1.2.2

VIS1.2.3

VIS1.2.4

VIS1.2.5

Are there scratches in the inside surface of the radome top or white fiberglass power residue inside the radome? This indicates that the dish or feed has been rubbing against the inside surface of the radome. Carefully inspect the edge of the dish, cables that wrap around the edge of the dish and the feed and note any findings. Are there signs of loose hardware? Tighten all loose hardware. If hardware is found in the base try to locate where it came off of and re-attach it. Are there signs of rust or corrosion? Minor rust and corrosion can be cleaned off. If necessary a light coating of CRC can be applied to affected (mechanical) areas [do NOT apply to electrical Contact Sea Tel Service departments]. Major rust and corrosion should be thoroughly inspected and reported Are there signs of loose wiring connections?

- 4-87 -

Contact Sea Tel Service department to report findings.

Yes No

VIS1.2.4

Yes No

VIS1.2.5

Contact Sea Tel Service department to report findings. Yes No

VIS1.2.6

VIS Step


Results


Yes

Contact Sea Tel Service department to report findings. Return

Note: Extra harness cables that are not used by your antenna are normally coiled up just behind the dish. These should have a tiewrap to secure them and prevent them from electrically shorting. These do not need to be connected. Older systems may have a loose encoder cable (near the azimuth motor bracket) that was disconnected and is no longer being used.

VIS1.2.6

Tighten/Re-connect any other loose connections found Are there signs of any other wear or damage? Note any damage found.

No

- 4-88 -


V

DRAWINGS

Drawings

MODEL 2094 Stabilized Pedestal Drawing 117136 113629 113483 115136 115203 115161 112479 112455 113478 114787

Title Installation & Operation Manual (Consumer) Installation & Operation Manual (Dealer) System Interconnect Diagram Model 2094 General Assembly Pedestal Harness Schematic 3 Axis Interface Harness Assembly PCU PCB Assembly PCU PCB Schematic Control Cable Assembly ACU to PCU Shielded Control Cable Assembly ACU to PCU

MODEL 2494 Stabilized Pedestal Drawing 117134 116680 113483 116086 117422 118023 115203 112479 112455 114724 113478 114787

Title Installation & Operation Manual (Consumer) Installation & Operation Manual (Dealer) System Interconnect Diagram Model 2494 General Assembly Model 2494 WeSat Upgrade Kit Antenna System Schematic Pedestal Harness Schematic 3 Axis PCU PCB Assembly PCU PCB Schematic Polang Aux Relay PCB Schematic Control Cable Assembly ACU to PCU Shielded Control Cable Assembly ACU to PCU

MODEL 3294 Stabilized Pedestal Drawing 117132 114928 113483 116163 116083 117694

Title Installation & Operation Manual (Consumer) Installation & Operation Manual (Dealer) System Interconnect Diagram System Block Diagram WeSat/DBS Dual Receive Model 3294 General Assembly Model 3294 General Assembly (48” Radome) - 5-1 -

DRAWINGS 118024 115203 114724 112479 112455 115028 114787 113480

Series 94 Troubleshooting Guide Antenna System Schematic Pedestal Harness Schematic 3 Axis Polang Aux Relay PCB Schematic PCU PCB Assembly PCU PCB Schematic Conscan Motor Driver PCB Schematic Shielded Control Cable Assembly ACU TO PCU RF Cable Assembly

MODEL 4094 Stabilized Pedestal Drawing 117131 116699 113483 116163 116117 116640 118024 115203 114724 112479 112455 115028 114787 113480

Title Installation & Operation Manual (Consumer) Installation & Operation Manual (Dealer) System Interconnect Diagram System Block Diagram WeSat/DBS Dual Receive Model 4094 General Assembly (48” Radome) Model 4094 General Assembly (54” Radome) Antenna System Schematic Pedestal Harness Schematic 3 Axis Polang Aux Relay PCB Schematic PCU PCB Assembly PCU PCB Schematic Conscan Motor Driver PCB Schematic Shielded Control Cable Assembly ACU TO PCU RF Cable Assembly

MODEL 4894 Stabilized Pedestal Drawing 117120 115611 115613 116163 115464 118024 115203 112479 112455 115326 115028 114787

Title Installation & Operation Manual (Consumer) Installation & Operation Manual (Dealer) System Block Diagram 4894 System Block Diagram WeSat/DBS Dual Receive General Assembly Model 4894 with Conscan Antenna System Schematic Pedestal Harness Schematic 3 axis PCU PCB Assembly PCU PCB Schematic Polang Relay w/ PS PCB Schematic Conscan Motor Driver PCB Schematic Shielded Control Cable Assembly ACU TO PCU

- 5-2 -

Series 94 Troubleshooting Guide MODEL 6094 Stabilized Pedestal Drawing 117521 117471 117470 117365 115203 115541 112479 112455 115325 115326 114787

DRAWINGS

Title Installation & Operation Manual (Dealer) System Block Diagram 6094 General Assembly Model 6094 Antenna System Schematic Pedestal Harness Schematic 3 axis Interface Harness Assembly 6094 PCU PCB Assembly PCU PCB Schematic Polang Relay w/ PS PCB Assembly Polang Relay w/ PS PCB Schematic Shielded Control Cable Assembly ACU TO PCU

Radomes for DBS Antenna Pedestals Drawing 115137 113540 113627 114128 114610 114449 114120 109171 114594 115609 115612 115414 115411

Title 24” Radome Assembly 30” Radome Assembly 30” Radome Installation Arrangement 40” Radome Assembly 40” Radome Installation Arrangement 48” Radome Assembly 48” Radome Installation Arrangement 54” Radome Assembly 54” Radome Installation Arrangement 60” Radome Assembly 60 Inch Radome Installation Arrangement 72” Radome Assembly 72” Radome Installation Arrangement

Model TAC-92C Tracking Antenna Controller Drawing 113118 113490 113486 115755 115959 113275 112226 112514 112512 112970

Title Installation & Operation Manual (Dealer) TAC-92C Table Top General Assembly TAC-92C Table Top Chassis Wiring Diagram TAC-92C Rackmount General Assembly TAC-92C Rackmount Chassis Wiring Diagram TAC-92C ACU PCB Assembly TAC-92C ACU PCB Schematic Front Panel Interconnect PCB Assembly Front Panel Interconnect PCB Schematic 360:1 to SBS Converter PCB Assembly - 5-3 -

DRAWINGS 112969 114836 114648 113037 113036 113747 113744 113888 113744 116676 116685 112791 114493 116670

Series 94 Troubleshooting Guide 360:1 to SBS Converter PCB Schematic 12 Bit S/D Converter PCB Assembly 12 Bit S/D Converter PCB Schematic AGC Receiver Interface PCB Assembly AGC Receiver Interface PCB Schematic Aux Serial Port Adapter PCB Assembly Aux Serial Port Adapter PCB Schematic Conscan/Aux Serial Port PCB Assembly Conscan/Aux Serial Port PCB Schematic ACU Terminal Mounting Strip Assembly ACU Terminal Mounting Strip Schematic Interface Cable Diagram GPS to ACU TAC-92/TAC-92C User Interface Description RS-232 Cable Assembly (PCDAC Cable)

- 5-4 -

MD AEF

MAB MF MF AEF

MD

MP

PGB MAB

APJ APJ APJ APJ APJ PGB MAB MAB MAB MAB MAB

MAB MAB

PGB

JHD MP MAB MAB MAB MAB MAB MAB MAB MF

JHD MF

MP APJ APJ APJ MAB MAB MAB

MAB MAB MAB RMC MF MF MF

JHD

JHD

JHD MF

MP MAB

DF MAB

MP MAB

MP MAB

ITEM

QTY

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

1 1 1 4 4 3 1

SEATEL PART NUMBER

DRW SZ

DESCRIPTION

113746 109089-41 109089-52 109089-57 109089-65 109089-89 109089-137

B A A A A A A

AUX SERIAL PORT ADAPT. PCB FAB RESISTOR, ¼ WATT, 5% RESISTOR, ¼ WATT, 5% RESISTOR, ¼ WATT, 5% RESISTOR, ¼ WATT, 5% RESISTOR, ¼ WATT, 5% RESISTOR, ¼ WATT, 5%

100 ohm 300 ohm 470 ohm 1K 10K 1 MEG

R14 R13 R2,R6,R7,R8 R10,R12,R16,R17 R1,R9,R15 R11

2 4 1 1

110784-103 110784-104 109736-4 109736-6

A A A A

CAPACITOR, MONOLYTHIC CAPACITOR, MONOLYTHIC CAPACITOR, ELECTROLYTIC CAPACITOR, ELECTROLYTIC

.01uF .1uF 10uF 100uF

C3 (J1-1 TO J1-2) C1,C2,C4,C6 C5 C7

1 3 0

109087 108837-4 108837-3

A A A

DIODE, SWITCHING DIODE, LED DIODE, LED

1N914 RED GREEN

D8 D5,D6,D7 D1,D2,D3,D4

1 1 1

110865-2 109097-9 112576-1

A A A

TRANSISTOR, PNP I.C. SOCKET CERAMIC RESONATOR

2N3906 40-PIN 4.00 MHz

Q1 U1 X1

1 1 1

110792-2 109105-2 109086-8

A A A

I.C., CMOS 6805 I.C., OPTO-ISOLATOR I.C., VOLTAGE REGULATOR

68HC70568P 4N35 LM7805

U1 U2 U5

1 1

110935-15 111461-10

A A

CONNECTOR, D-SUB., PC MOUNT HEADER, .100 FRICTION LOCK

DE-9P 10-PIN

J1 J2

1 1

109735-2 111461-3

A A

HEADER, .100 SPACING HEADER, .100 FRICTION LOCK

2 POS. 3 POS.

D1 JP3

SCALE: DATE:

VALUES

REFERENCE / NOTES

APPROVED BY: 3-9-95

DRAWN BY:

PGB

REVISED:

MF

AUX SERIAL PORT ADAPTER PCB ASSEMBLY DRAWING NUMBER SHT. 1 OF 1 DOC. NO. 117030-A

113747-G

APJ MAB MAB MF

PGB MF

PGB MF

APJ MAB MAB MAB MF

PGB

MAB AEF

MP

EJ AEF

MAB MF MAB AEF

EJ

EJ AEF

EJ AEF

MAB RMC MF MAB AEF

EJ

EJ AEF

SEA TEL MODEL DAC-97 USER INTERFACE DESCRIPTION VERSION 3.01 1.0 COMMAND SUMMARY

(2nd Serial port commands)

CONTROL CODES: 6 4 8 2 Aaaaa{} Baaaa{} cnnnn{} dnnnn{} C D Eeeee{} gnnn{} hnnn{} Jrrrr{} Nnnn{} nnnnn{} Onnn{} R s Taaaa{} U W Xnnn{} Ynnn{} $mmmmm{} ^nnnn{} esc !

FUNCTION Azimuth CW one step (Not available in 3.00) Azimuth CCW one step " Elevation UP one step " Elevation DOWN one step " Move AZ to aaa.a deg. true or magnetic Set ships heading to aaa.a degrees Set MHz/CHA tuning to nnnn MHz Set KHz/CHB tuning to nnnn KHz/MHz Tracking (Step Track / Conscan) ON Tracking (Step Track / Conscan) OFF Move EL to eee.e degrees Set 24v polang position to nnn Set 5v PWM polang position to nnnn Move azimuth to ship relative position Set step track integral (0-255) Set remote “N” parameters to Nnnnn Output data to EME equipment Begin Spiral search Advance AGC input selection (Ext, ChA, CHB, IF) Move to satellite at aaa.a degrees Force cable unwrap Write parameters to NV RAM Set azimuth step track / conscan sensitivity to nnn steps (0-255) Set elevation step track / conscan sensitivity to nnn steps (0-255) NMEA Latitude / Longitude input (GPGLL format) Send remote Utility command ^nnnn to PCU Cancel Pending Command Enable NVRAM writes

MONITOR CODES H M P S V q u % @ & ?a{}

FUNCTION Relative Az,Ship Heading Tracking Parameter Dump Az/EL Position TAC Status Software Version Read Tuning Frequencies Read Temperature, polang Read Signal Strength Report Lat / Lon Position Read/Clear Error Status Remote Monitor Request

ABBREVIATIONS: eeee = aaaa = rrrr = x = nnnn = nnn = uuu = nn = e = {} =

Elevation angle 0000 to 0900. True/Magnetic Azimuth 0000 to 3599 range Relative azimuth 0950 to 6250 range ASCII hex I/O data ASCII decimal number (0000-9999) ASCII decimal number 0 to 255 ASCII decimal number 0 to 999 System Status two ASCII words defined below: Error status Carriage return

May 1998

TAC RESPONSE RrrrrHaaaa CR,LF,> Xnnn Ynnn Nnnn CR,LF,> EeeeeAaaaa CR,LF,> Snn CR,LF,> TAC-92C VER N.NN CR,LF,> Qnnnn nnnn s CR,LF,> GnnnnUuuuu CR,LF,> Lnnnn CR,LF,> NeeeeWaaaa CR, LF, > NOT IMPLEMENTED remote response to “a” CR

Doc No. 114493-G

SEA TEL MODEL DAC-97 USER INTERFACE DESCRIPTION VERSION 3.01 2.0 CONTROL CODE DETAILS For the following descriptions, one step equals 1/24 degree for standard pedestal. 6,4

Azimuth CW,CCW one step. TAC Response: None

8,2

Elevation UP/DOWN one step. TAC Response: None

Aaaaa{}

Move AZ to aaa.a degrees magnetic. May cause antenna to move more than 180 degrees if shorter path will place antenna within 90 degrees of an end stop. TAC Response: CR,LF,">" when command is accepted.

Baaaa{}

Set ships compass heading to aaa.a degrees. Sets Heading Valid flag (Bit 3, word 2). Resets calculated azimuth position (P command) to ships heading + azimuth relative position modulo 360.0 degrees. The ships heading is automatically updated by the gyro compass inputs to the ACU. Not valid for 1:1 gyro compass interface. TAC Response: CR,LF,">" when command is accepted.

C

Step track ON. Sets Steptrack ON status flag (bit 3 word 1). Enables step track movements synchronized with "L" signal strength updates. Default state OFF. TAC Response: None.

D

Step track OFF. Clears Steptrack ON status flag (bit 3 word 1). Disables tracking. TAC Response: None.

cnnnn{}

Sets CHA tuning for IN A receiver or MHz tuning for IF receiver to nnnn MHz. TAC Response: CR,LF,">" when command is accepted.

dnnnn{}

Sets CHB tuning for IN B receiver to nnnn MHz or KHz tuning for IF receiver to nnn KHz. TAC Response: CR,LF,">" when command is accepted.

Eeeee{}

Move EL to eee.e degrees. TAC Response: CR,LF,">" when command is accepted.

gnnn{}

Set 24v Polang position to nnn. For 24v polang systems 30 to 210 corresponds to approximately -90 to +90 degrees from vertical. For flip antenna systems, 000 corresponds to the flat plate array, 128 corresponds to the horn antenna. TAC Response: CR,LF,> when command is accepted.

hnnn{}

Set 5v PWM Polang position to nnn. For 5v polang systems 50 to 200 corresponds to a probe angle of approximately -90 to +90 degrees from vertical. TAC Response: CR,FL,> when command is accepted.

Jrrrr{}

Move azimuth to ship relative position. Azimuth stabilization, Unwrap and and Tracking mode remain active after a J command. TAC Response: CR,LF,">" when command is accepted.

May 1998

Doc No. 114493-G

SEA TEL MODEL DAC-97 USER INTERFACE DESCRIPTION VERSION 3.01 Nnnn{}

Set number of signal strength updates to accumulate for each trial step for step track operation. "N" should be set for a 2-6 second step track interval. Allowable range is 0 to 255. A setting of 0 disables step track and enables Conscan. TAC Response: CR,LF,">" when command is accepted.

nnnnn{}

Sets Remote PCU parameters to Nnnnn. Used to set pedestal system type, adjust individual axis gains and set reference offsets. TAC Response: CR,LF,">" when command is accepted.

Onnn{}

Output data to EME equipment. Changes logic state of output lines DO0-DO3. Data is sent as ASCII hexadecimal. Allowable range of nnn "0" to "7" TAC Response: CR,LF,">" when command is accepted.

R

Starts two axis spiral search pattern for satellite (SEARCH2). Sets Searching status flag (bit 0, word 2) and Steptrack ON status flag (bit 3 word 1). Search pattern size and increment is pre-set by the TAC-92 Setup parameters. Search is terminated by signal level above threshold, end of search pattern or a new Az or EL position command. If no signal is found then antenna is returned to its original azimuth and elevation position. TAC Response: None

s

Advance AGC input selection by one. Selection of External, RF in A, RF in B or IF receivers corresponds to an "s" value of 0, 1, 2 or 3 respectively. The current "s" value is reported by the "q" Monitor Code. TAC Response: none

W

Write all setup parameters to NV RAM. TAC Response: None

Xnnn{}

Set azimuth step track size or conscan sensitivity to nnn steps. Allowable range is 0 to 255. The maximum conscan sensitivity setting is 0. Increasing the conscan setting by one decreases the system sensitivity by a factor of 2. TAC Response: CR,LF,">" when command is accepted.

Ynnn{}

Set elevation step track size or conscan sensitivity to nnn steps. Allowable range is 0 255 steps. Setting "Y" to zero disables elevation step track doubling the speed of the azimuth step track. See Xnnn setting for conscan information. TAC Response: CR,LF,">" when command is accepted.

$mmmmm{}

NMEA Latitude / Longitude input. Sentence format as follows: GPGLL,YYYY.YY,N,XXXXX.XX,W (,UTC optional) YYYY.YY = Latitude in Degrees, Minutes, Decimal minutesN = North, S = South Latitude XXXXX.XX = Longitude in Degrees, Minutes, Dec Minutes E = East, W = West Longitude

May 1998

Doc No. 114493-G

SEA TEL MODEL DAC-97 USER INTERFACE DESCRIPTION VERSION 3.01 3.0 MONITOR CODE DETAILS H

Relative AZ / Ships Heading position report. Reports simultaneous value of Antenna Relative position and Ships heading position in tenths of degrees. Relative azimuth range is 0950 to 6250. Ships heading range is 0000 3599. TAC Response: "RrrrrHaaaa",CR,LF,">"

M

Not implemented in this version. Parameter Dump. Response is one line of ASCII characters representing the X,Y and N step track parameters. TAC Response: "Xnnn Ynnn Nnnn",CR,LF,">"

P

Az/EL Position. Response is one line of ASCII characters representing the antenna elevation and true azimuth position in tenths of a degree. Elevation range is 0000 to 0900. Azimuth range is 0000 to 3599. TAC Response: "EeeeeAaaaa",CR,LF,">"

S

TAC Status. Response is two ASCII characters representing the system status according to the following table. This command can be issued at any time and is not locked out by pending I/O commands. TAC Response: "Snn",CR,LF,">" nn Status Words: WORD1 Bit 0 = Remote Alarm Bit 0 Bit 1 = Remote Alarm Bit 1 Bit 2 = Unwrap in progress Bit 3 = Steptrack On Bit 4 = spare Bit 5 = Auto Unwrap On Bit 6 = 1 Bit 7 = 0

WORD 2 Bit 0 = Searching Bit 1 = Initializing Bit 2 = Error Detected Bit 3 = Heading Valid Bit 4 = Elevation targeting Bit 5 = Azimuth targeting Bit 6 = 1 Bit 7 = 0

V

Software Version. Response is ASCII string defining software model and version number. TAC Response: "TAC-92 VER N.NN",CR,LF,">"

q

Tuning Frequency. Response is Channel A tuning, Channel B tuning and receiver selection. For IF receiver selection, response is MHz portion , KHz portion of the tuning frequency and receiver selection. Receiver selection of External, RF in A, RF in B or IF receivers corresponds to an "s" value of 0, 1, 2 or 3 respectively. TAC Response: "Qnnnn nnnn s",CR,LF,">"

u

Polang / AUX read. Response is polang position (nnnn) and Auxiliary A/D reading (uuuu) from remote PCU. Reads polang pot for 24 volt polang systems and polang PWM output for 5v systems. For flip antenna systems, 000 indicates primary antenna, 128 indicates secondary antenna. Aux A/D reading is 0000-4095 for 0 to 5v input. If Aux Read is temperature, Degrees C = 2.0 + .032 x uuuu - 3271 / uuuu. TAC Response: "GnnnnUuuuu",CR,LF,">"

%

Signal Strength. Response is average signal strength over N sample intervals in ASCII hex characters. Allowable range of response is 0000 to FFFF. TAC Response: "Lssss",CR,LF,">"

May 1998

Doc No. 114493-G

SEA TEL MODEL DAC-97 USER INTERFACE DESCRIPTION VERSION 3.01 @

Latitude / Longitude Position Read. Reports North/South Latitude and East/West Longitude read from GPS receiver in tenths of a degree. TAC Response: “NeeeeWaaaa”,CR,LF,”>“

?a{}

Request Remote Status. Sends the “a” Status Request command to the PCU and echoes the PCU response less checksums. ?S{} gets PCU status, ?V{} gets PCU Version Number. TAC Response “PCU status response” + CR,LF,”>”.

4.0 GENERAL NOTES The CR,LF,">" echo indicates that the TAC has accepted a command and is ready to process the next command. Any additional commands will not be accepted until after the TAC echoes CR,LF,">". The normal command latency for Monitor or Control commands is 25 mili Seconds. Temperature in degrees C = 2.0 + .032 x uuuu - 3271 /uuuu.

May 1998

Doc No. 114493-G

MAB AEF

CDC

AEF

MP

JP RMC

MAB MAB

MAB MAB

MAB MF

JP JP JP MF RMC MF MF RMC MF MAB AEF MF MF

RMC

MAB

MAB

MP AEF

SAM RMC RMC RMC MF MAB

MF AEF

MAB

AEF

MAB

MAB

MAB

MAB MF

SAM MF

CDZ

CDZ JP MAB

RMC MF MF MF RMC MF AEF MF MF

SAM

SAM MF

SAM

JP JP CDZ CDZ RMC CDZ MAB

RMC MF MF MF RMC MF RMC AEF AEF MF MF

MAB

SAM

SAM MF

MAB RMC JP RMC RMC MF MF MF RMC MF AEF MF MF

SAM

SAM

MAB MF

RMC MF MF RMC MF MF

AEF MF MF

MAB

MAB MF

MAB JT MBD MF AEF MF AEF

MAB

Sea

Tel

Marine Stabilized Antenna Systems Model 2494 Wesat Upgrade Assembly Instructions 1.

Remove existing Interface Harness Assembly. Begin by removing connections at radome base connector bracket (see Detail ‘C’ of drawing). Disassemble 9-pin circular connector and remove pins. Disconnect the (2) existing ‘F’ connectors. Remove the spooler top, cut the cable tie that attaches the harness to the standoff, and carefully pull the harness up through the spooler. Remove cable clamps (to be reused) along harness routing until the reflector is reached. Disconnect harness at feed and pull wires through the grommet in the reflector.

2.

Replace existing feed assembly with new Wesat feed assembly (item 1). Remove feed strut mounting clip hardware to disconnect feed and use existing hardware to mount the Wesat feed assembly.

3.

Install Geostationary LNA (item 2) on LNA mounting bracket (item 3) using (2) 6-32 x ½” PH Pan Head Screws (item 7) as per drawing.

4.

Remove the feed strut screw just underneath location of reflector braces and two of the four antenna mounting screws on the elevation pan stiffener. Use this hardware to fasten the LNA mounting bracket (item 3) to the back of the antenna.

5.

Route the free end of the supplied Interface Harness Assembly through the top of the spooler and terminate cables at connector bracket in the base of the radome (see Detail ‘C’ of drawing). Add ‘F’ bullet (item 6) at location shown on drawing for Wesat connection. Insert pins into the 9-pin circular connector as shown in Detail ‘C’ of drawing and secure to connector bracket. Fasten a cable tie around the harness and standoff at the top of the spooler. Rotate the pedestal counterclockwise to the left stop and provide adequate slack in the harness as shown in Detail ‘A’ of the drawing. Feed the harness through the cable clamp located directly behind the opening in the spooler top (see drawing) and fasten a cable tie on both sides of the cable clamp. Verify that the harness is wound according to Detail ‘B’ of the drawing when the pedestal is rotated clockwise to the right stop. Adjust the amount of slack in the harness at the cable clamp location as necessary. Replace the spooler top and continue to route the harness as shown on the drawing through all cable clamps until you reach the reflector. Route the (2) longest ‘F’ male cables through the grommet in the reflector and terminate at the feed. The shortest ‘F’ male cable is to be terminated at the Geostationary LNA connector labeled ‘receiver’.

6.

Install the N(male) to SMA(male) cable (item 4) from the Geostationary LNA (item 2) connector labeled “antenna” to the Wesat dome located at the feed (item 1). Follow cable routing as shown on the drawing included. Use the supplied cable ties (item 8) to fasten the cable to the unit and remember to allow clearance for sufficient feed rotation.

7.

Apply cable ties (item 8) as necessary to secure Interface Harness.

February 17, 1999

Document No. 117422-0

ITEM

QTY

1 2 3 4 5 6 7 8 9 10 11 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 34 2 1 4 2 2 4 2

SEATEL PART NUMBER

114978 114979 114392 114375 114226-1 115414-4 113873-1 114180-1 117517 110486-3 117560-1 117560-2 114540 110256-2 117343-1 114450-2 117570-1 117570-2 113605 109270 112467-8 115325-1 108885-27

DRW SZ

D C C C C C B B A B B B B B A A B B A A A B A

1 8 8 6 33 17 4 8 4 4 8

-1

W/O COAX SWITCH

-2

W/COAX SWITCH

DESCRIPTION

MANUFACTURER’S SPECIFICATIONS

BASE SPINDLE ASSEMBLY CROSS LEVEL / POST ASSEMBLY LEVEL BEAM ASSEMBLY ELEVATION PAN ASSEMBLY LEVEL PLATFORM ASSEMBLY 72” RADOME ASSEMBLY PCU ENCLOSURE ASSEMBLY TRAIN MOTOR ASSEMBLY C-BAND VERTEX FEED ASSEMBLY 1.5M – 5FT REFLECTOR MACHINING LNB MOUNTING PLATE ASSEMBLY LNB MOUNTING PLATE ASSEMBLY PRO-II C-BAND DIGI-READY LNB C-BAND BANDPASS FILTER WGA-229 WAVEGUIDE ADAPTER RF COAX. SWITCH REFLECTOR BRACE REFLECTOR BRACE REFLECTOR CROSS BRACE REFLECTOR CLIP WASHER STANDOFF POL. AUX. RELAY W/PS PCB ASS’Y EQUIPMENT STANDOFF SCREW, PH PHD SCREW, PH PHD WASHER, FLAT NUT, HX SCREW, PH PHD SCREW, PH PHD SCREW, PH FLAT HD SCREW, PH PHD WASHER, FLAT NUT, HX SCREW, HX HD WASHER, FLAT NUT, HX SCREW, HX HD WASHER, FLAT

NONE

DATE:

3-31-99

(REF. ITEM 1) (REF. ITEM 1) (C.F.E.) (-1 ASS’Y ONLY) (-2 ASS’Y ONLY) (REF. ITEM 11) (REF. ITEM 11) (REF. ITEM 11) (REF. ITEM 11)(-2 ASS’Y ONLY) (LEFT) (RIGHT)

(.25” O.D. x #6 x .18” L.) (.50” O.D. x .26” I.D. x .50” L.) 6-32 x 3/8”, S.S. 6-32 x ½”, S.S. No. 6, S.S. 6-32, S.S. 10-32 x 1-1/8”, S.S. 10-32 x 5/8”, S.S. 10-32 x ¾”, S.S. 10-32 x 7/8”, S.S. No. 10, S.S. 10-32, S.S. ¼-20 x 5/8”, S.S. ¼”, S.S. ¼”, S.S. 5/8-11 x 1-3/4”, S.S. 5/8”, S.S.

Sea SCALE:

(REF. ITEM 4)

Tel

APPROVED BY:

DRAWN BY:

MAB

REVISED:

MAB

GENERAL ASSEMBLY – MODEL 6094-1, -2 DRAWING NUMBER SHT. 1 OF 2 DOC. NO. 117030-A

117470-A

ITEM

QTY

39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84

4 4 3 1 1 1

SEATEL PART NUMBER

114662-318 117766 115541-3 115868-4

DRW SZ

A B C C

DESCRIPTION

WASHER, LOCK NUT, HX STANDOFF ELEVATION COUNTER WEIGHT ASS’Y INTERFACE HARNESS ASSEMBLY PEDESTAL HARNESS ASSEMBLY


5/8”, S.S. 5/8”, S.S. (.38” O.D. x .20” I.D. x .50” L.) (NOT SHOWN) (NOT SHOWN) (NOT SHOWN)

DRAWING NUMBER MODEL: 6094-1, -2

SHT. 2

117470-A

ITEM

QTY

1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1

SEATEL PART NUMBER

117470-1 117470-2 117517 110486-3 114450-2 113873-1 115325-1 117343-1 110256-2 114540 115541-3 115868-4 115755-1 116676 110293-4 113480-1 114787 109391 115198 116670 113189-1 117560-1 117560-2

-1

W/O COAX SWITCH

-2

W/ COAX SWITCH

DRW SZ

DESCRIPTION


D D A A A B B C B B C C D B A A B A A B B B B

GENERAL ASSEMBLY – MODEL 6094-1 GENERAL ASSEMBLY – MODEL 6094-2 C-BAND VERTEX FEED ASSEMBLY 1.5M REFLECTOR MACHINING RF COAX. SWITCH PCU ENCLOSURE ASSEMBLY POLANG AUX. RELAY W/PS PCB ASS’Y WR-229 COAX ADAPTER C-BAND BANDPASS FILTER C-BAND DIGITAL LNB INTERFACE HARNESS ASSEMBLY PEDESTAL HARNESS ASSEMBLY TAC-92C RACKMOUNT GENERAL ASS’Y TERMINAL MOUNTING STRIP ASS’Y 4-WAY COAX SPLITTER RF CABLE ASSEMBLY SHIELDED CONTROL CABLE ASS’Y ‘F’ BULLET CONNECTOR BRACKET RS-232 CABLE ASSEMBLY GPS ANTENNA INSTALLATION KIT LNB MOUNTING PLATE ASSEMBLY LNB MOUNTING PLATE ASSEMBLY

(-1 ASS’Y ONLY) (-2 ASS’Y ONLY) (C.F.E.)(REF. ITEM 1) (REF. ITEM 1) (REF. ITEMS 1 & 21)(-2 ASS’Y ONLY) (REF. ITEM 1) (REF. ITEM 1) (REF. ITEMS 1 & 21) (REF. ITEMS 1 & 21) (REF. ITEMS 1 & 21) (REF. ITEM 1) (REF. ITEM 1)

Sea

(REF. W/O) (REF. W/O) (-1 ASS’Y ONLY) (-2 ASS’Y ONLY)

Tel

APPROVED BY:

SCALE: DATE:

(50 ft.)

3-16-99

DRAWN BY:

MAB

REVISED:

MAB

SYSTEM BLOCK DIAGRAM DRAWING NUMBER MODEL: 6094-1, -2 DOC. NO. 117030-A

SHT. 1 OF 1

117471-A

DF MF

DF MF MF RMC

MF AEF MF MF

DF

DF MF

Antenna Seatel Series 94 Troubleshooting Guide

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