DC30-007 Quantum QT-740 & QT-750 Service Manual Rev Q

™

Models QT-740 and QT-750

Fixed/Elevating Float-Top Radiographic Tables Service Manual

Manual Part No. DC30-007 Revision Q

EU Authorized Representative: Medizintechnik Berlin GmbH Altentreptower, Strasse 59 12683 Berlin - Germany Phone: +49-302-82 4726 Fax: +49-302-82 6382 E-mail: [email protected]

THE ORIGINAL VERSION OF THIS MANUAL DATED DECEMBER 7, 2000 HAS BEEN DRAFTED IN THE ENGLISH LANGUAGE BY QUANTUM MEDICAL IMAGING

This manual is copyrighted and all rights are reserved. No portion of this document may be copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine readable form without prior consent in writing from Quantum Medical Imaging, (QMI)

Copyright© 2007 QMI

Quantum Medical Imaging, 2002-B Orville Drive North Ronkonkoma, New York 11779 USA Phone: (631) 567-5800 Fax: (631) 567-5074 E-mail: [email protected] www.quantummedical.net

Made in U.S.A.

Revision History

REVISION

DATE

TYPE OF MODIFICATION

A

12/07/00

Initial Release.

B

1/5/01

Added long. magnet adjustment, tabletop width adjustment, DC Motor Driver Bd. replacement procedure

C

2/22/01

Incorporated ECO’s 0241, 0242, 0245, 0247, 0256, 0285

D

4/19/01

Incorporated ECO 0335

E

5/17/01

Modified table mounting instructions

F

8/6/01

Incorporated ECO’s 0294, 0417, 0447, 0451, 0492

G

11/6/01

Incorporated ECO’s 0544, 0572, 0574, 0599

H

3/15/02


J

7/1/02


K

8/1/02

Incorporated ECO 0853

L

6/20/03

Incorporated ECO 0894, 1025, 1038, 1116, 1232

M

4/29/03

Incorporated ECO 1189, 1314, 1328, 1359, 1436, 1447

N

9/17/04

Incorporated ECO 1482, 1525

P

4/28/06

Incorporated ECO 1583, 1584, 1605, 1689, 1716

Q

9/7/07

Incorporated ECO 1807, 1850, 1859, 1880

Page Number

Rev

i - iv

Q

1-1 thru 1-8

Q

2-1 thru 2-24

Q

3-1 thru 3-6

Q

4-1 thru 4-34

Q

5-1 thru 5-9

Q

Page Number

Models QT-740 & QT-750 - Service Manual Quantum Medical Imaging

Rev

Page Number

Rev

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Revision History

THIS PAGE INTENTIONALLY LEFT BLANK

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Table of Contents

Chapter 1 Specifications PHYSICAL SPECIFICATIONS ................................................................................. 1-3 TABLETOP SPECIFICATIONS ............................................................................. 1-3 TABLE BASE SPECIFICATIONS ........................................................................... 1-3 IMAGE RECEPTOR SPECIFICATIONS .................................................................. 1-3 SYSTEM SPECIFICATIONS ................................................................................. 1-4 ELECTRICAL SPECIFICATIONS .............................................................................. 1-4 SYSTEM OPTIONS ................................................................................................ 1-4 SYSTEM OPERATING ENVIRONMENT .................................................................... 1-4 NON-OPERATING ENVIRONMENT ......................................................................... 1-4

Chapter 2 Assembly & Installation OVERVIEW .......................................................................................................... 2-3 UNPACKING ........................................................................................................ 2-3 TABLE ASSEMBLY ................................................................................................ 2-3 POSITIONING THE TABLE BASE ........................................................................ 2-3 ELECTRICAL CONNECTIONS .............................................................................. 2-4 Power Input Connections (Power Cord with Plug Configuration) .................... 2-4 Power Input Connections (Permanent Wiring Configuration) ......................... 2-4 Re-Configuring AC Line Input Transformer (115 VAC/230 VAC Input) ............ 2-6 Bucky Power Input Connections .................................................................. 2-6 PBL Interlock Cable Connections ................................................................. 2-6 TABLE LEVELING AND MOUNTING ........................................................................ 2-8 MODEL QT-740 - LEVELING AND MOUNTING INSTRUCTIONS ............................. 2-8 MODEL QT-750 - LEVELING AND MOUNTING INSTRUCTIONS ............................. 2-8 ALIGNMENT PROCEDURES ................................................................................... 2-9 IMAGE RECEPTOR/COLLIMATOR X-RAY ALIGNMENT .......................................... 2-9 TABLETOP ASSEMBLY/INSTALLATION ............................................................. 2-11 REDUCING THE TABLE TOP HEIGHT (MODEL QT-750 ONLY) ............................ 2-14 OPERATOR CONTROL HANDLE ASSEMBLY INSTALLATION ................................ 2-16 OPERATIONAL CHECKS AND ADJUSTMENTS ........................................................ 2-17 CHECKING TABLE FLOAT-TOP OPERATION ...................................................... 2-17 CHECKING UP/DOWN OPERATION (MODEL QT-750 ONLY) ............................... 2-17 TABLE UP/DOWN SPEED ADJUSTMENT (MODEL QT-750 ONLY) ........................ 2-18 PEDAL DISABLE SWITCH OPERATIONAL CHECK ............................................... 2-18 CHECKING THE OBSTRUCTION SENSORS (ELEVATING TABLE ONLY) ................ 2-19 RECEPTOR CABINET LOCKING MAGNET CHECK ............................................... 2-20 POSITIVE BEAM LIMITATION (PBL) COLLIMATORS .......................................... 2-21 MODEL QT-750 COVERS INSTALLATION/ADJUSTMENT PROCEDURE ..................... 2-21 MODEL QT-740 COVERS INSTALLATION PROCEDURE .......................................... 2-23


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Table of Contents

Chapter 3 Theory of Operation OVERVIEW ..........................................................................................................3-3 MODEL QT-740 TABLE ......................................................................................3-3 Power Distribution ......................................................................................3-3 Float Control ..............................................................................................3-4 Foot Pedal Disable Circuit ...........................................................................3-4 Receptor Cabinet Lock ................................................................................3-4 MODEL QT-750 TABLE ......................................................................................3-4 Power Distribution ......................................................................................3-4 Voltage Regulation .....................................................................................3-5 Float Control ..............................................................................................3-5 Foot Pedal Disable Switch ...........................................................................3-5 Positive Beam Limitation .............................................................................3-5 Receptor Cabinet Lock ................................................................................3-5 Emergency Stop Switch ..............................................................................3-5

Chapter 4 Service Instructions OVERVIEW ..........................................................................................................4-3 SERVICE MAINTENANCE ...................................................................................4-4 Visual Inspection ........................................................................................4-4 Functional Check for Model QT-750 Elevating Tables ....................................4-4 Lubrication ................................................................................................4-5 Float Top Locking Magnet Check .................................................................4-6 TROUBLESHOOTING PROCEDURES ....................................................................4-8 REMOVAL/REPLACEMENT PROCEDURES ........................................................... 4-13 Replacing the Drive Belt (Model QT-750 Tables Only) ................................. 4-13 Replacing the Sync Belt (Model QT-750 Tables Only) .................................. 4-14 Replacing the DC Motor (Model QT-750 Tables Only) .................................. 4-16 Replacing the DC Motor Driver Board A2 (Model QT-750 Tables Only) .......... 4-18 Receptor Cabinet Removal/Replacement .................................................... 4-22 Cassette Tray Removal Procedure ............................................................. 4-23 REPLACEMENT PARTS AND ORDERING INFORMATION ..................................... 4-24 ORDERING INFORMATION .............................................................................. 4-27

Chapter 5 Diagrams Model QT-740 Radiographic Table Wiring Diagram ..............................................5-3 Model QT-750 Radiographic Table Wiring Diagram ..............................................5-4 4-Way Table Control Board A1 (AY40-017T) .......................................................5-5 6-Way Table Control Board A1 (AY40-030T) Test Point Diagram ..........................5-6 Table Base Plate Mounting Hole Locations ..........................................................5-7 Installing Digital Image Receptor Using QT-FCD Mounting Bracket .......................5-8 Installing Digital Image Receptor Using QT-DDS Slide Mounting Bracket ...............5-9

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Chapter

1

SPECIFICATIONS

1 -1

1-2

Chapter 1 Specifications

PHYSICAL SPECIFICATIONS The following are physical specifications of the radiographic tables: TABLETOP SPECIFICATIONS Length:

85.0 inches (2159.0 mm)

Width:

35.5 inches (901.7 mm)

Height (Model QT-740):

32.5 inches (825.5 mm)

Height (Model QT-750): Raised: Lowered:

32.5 inches (825.5 mm) *(see note 1) 21.0 inches (533.4 mm)

Tabletop Travel: Longitudinal: Lateral:

32 inches (812.8 mm) 10 inches (254 mm)

Tabletop Material:

Fiber-resin (phenolic)

Tabletop X-ray Density:

1.0 mm Aluminum

Tabletop-to-Film Plane Distance:

approx. 2.75 inches (69.9 mm)

*Note 1: To compensate for low ceilings, maximum raised table height can be decreased by up to 2 inches less (see Assembly & Installation Chapter for instructions) TABLE BASE SPECIFICATIONS Width:

48.0 inches (1219.2 mm)

Depth:

26.0 inches (660.4 mm)

Maximum Patient Load (with non-digital image receptor): 650 lbs. (295 kg) Maximum Patient Load (with non-sliding digital image receptor): 600 lbs. (272.2 kg) Maximum Patient Load (with sliding digital image receptor): 550 lbs. (249.5 kg) IMAGE RECEPTOR SPECIFICATIONS Compatible With:

Grid Cabinet, Bucky, ACL Bucky

Receptor Longitudinal Travel: 20.0 inches (508.0 mm) **(see note 2) **Note 2: 17.00 inches (431.8 mm) of receptor travel with QT-DDS option


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SYSTEM SPECIFICATIONS Tube Stand Compatibility: Overall Weight: Model QT-740: Model QT-750:

Compatible with all Quantum Medical Imaging tube stands and overhead tube cranes 350.0 lbs. (158.8 kg) 500.0 lbs. (226.8 kg)

ELECTRICAL SPECIFICATIONS Input Power:

115 VAC (±10%), 15 Amps, 50/60 Hz 230 VAC (±10%), 10 Amps, 50/60 Hz

Mode of Operation: Model QT-740: Model QT-750:

Continuous Intermittent Operation (80 cycles/hour max.)

Momentary Current: Model QT-740: Model QT-750:

1.0 Amp 7.0 Amps

Long Term Current: Model QT-740: Model QT-750:

0.20 Amp 0.25 Amp

Locking System Power:

24 VDC/6.0 Amps

SYSTEM OPTIONS •

R90-CB: Abdominal compression band

•

Lateral cassette holder (for cross-table work)

•

QT-DDS: Digital Drawer Slide (see Figure 1-3 for specifications)

•

QT-BMP4: Rubber Corner Bumpers (set of four)

•

QT-PLS: Patient Support Strap

•

R-DLMP: Receptor Tray for Canon Imager allows images in length-wise (Portrait) and cross-wise (Landscape) modes.

SYSTEM OPERATING ENVIRONMENT Ambient Temperature:

+10°C to +40°C

Relative Humidity:

30 to 75%, non-condensing

Atmospheric Pressure:

700 hPa to 1060 hPa

NON-OPERATING ENVIRONMENT Ambient Temperature:

-18°C to +70°C

Relative Humidity:

20 to 95%, non-condensing

Atmospheric Pressure:

500 hPa to 1060 hPa

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85.00

2.75

87.00 (MIN.) TO INSTALL TABLETOP (ON EITHER LEFT OR RIGHT SIDE OF TABLE)

24.04 PC.G. 15.19 PC.G.

34.00

35.5

32.50 10.79 PC.G.

26.00

Figure 1-1. Model QT-740 Table Configuration Diagram


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35.5

NOTE: CENTER-OF-GRAVITY (C.G.) IS CALCULATED WITH TABLE FULLY ELEVATED AND WITHOUT PATIENT.

32.50 10.79 PC.G.

26.00

85.00

2.75

32.50 24.04 PC.G.

34.00

21.00

Figure 1-2. Model QT-750 Table Configuration Diagram

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Figure 1-3. Table with QT-DDS Option (Slide-Out Canon Digital Receptor)


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Chapter

2

ASSEMBLY & INSTALLATION

2-1

2-2

Chapter 2 Assembly & Installation

OVERVIEW Preparing the table for operation requires completion of the following tasks: •

Positioning the Table Base

•

Making the Electrical Connections

•

Alignment Procedures

•

Tabletop Assembly/Installation

•

Checking Table Operation

•

Installing the Covers

UNPACKING NOTE Examine all cartons and crates carefully at time of delivery. If damage is apparent, have delivery driver write a "Damaged Shipment Note" on copies of freight bill, sign it, and file appropriate carrier claim. Should you discover concealed damage, immediately notify the transporting agent and ask for an "Inspection of Damage". Carrier will not accept concealed damage claim if filed after 15 days from date of receipt of merchandise.

Open crate or carton marked "packing list enclosed" first. Remove packing list and use it as a guide to open the remaining cartons. Do not dispose of packing material until packing list is matched with actual parts received. Should there be a shortage or damage, notify manufacturer’s customer service department immediately. The manufacturer is relieved of any responsibility for damage during shipment after unit is picked up by the carrier.

TABLE ASSEMBLY The radiographic table is shipped with most of its major components assembled. However, the tabletop assembly must be attached to the base assembly and the covers must be installed. After the table is assembled, an operational check is performed. (This check is required only on Model QT-750 radiographic tables.) On systems equipped with QT-FCD option (fixed mount for Canon Digital Image Receptor), refer to Figure 5-5 in Chapter 5, Diagrams for instructions on installing the digital image receptor in the table. On systems equipped with QT-DDS option (drawer slide mount for Canon Digital Image Receptor), refer to Figure 5-6 in Chapter 5, Diagrams for instructions on installing the digital image receptor in the table. POSITIONING THE TABLE BASE Place the table base in the approximate location where it will be mounted. Ensure that the floor below the table is level. When positioning the table base, ensure there is a minimum clearance of 87 inches from the outer edge of Bearing Rail to the wall on either side of the table (see Figures 1-1 and 1-2). This allows for installation of the tabletop rails following table mounting. If enough clearance is provided, proceed to the "Electrical Connections" paragraph in this chapter. If there is not enough clearance on either side to install the tabletop after the table is mounted to the floor, the tabletop must be installed prior to mounting the table. To install the tabletop, proceed to the paragraph entitled "Tabletop Assembly/Installation" before performing the next procedure.


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ELECTRICAL CONNECTIONS CAUTION! This equipment contains electrostatic sensitive devices. Observe proper grounding precautions before handling components or printed circuit boards. Power Input Connections (Power Cord with Plug Configuration) For 115 VAC installations, a 25-foot power cord with a hospital-grade plug is factory pre-wired to the table. For 230 VAC installations, a 25-foot "HAR" power cord is factory pre-wired to the table; the installer must attach the proper plug depending on receptacle type used at installation site. If a line cord with plug is provided by the facility, it must have a 16 AWG minimum cord (Type SJT or equivalent) and a hospital grade plug. Connect plug to hospital grade receptacle only. The power supply line input connection is fused internal to the table (2A for 115 VAC line input, 1A for 230 VAC line input for Model QT-740 tables; 6A for 115 VAC line input, 3A for 230 VAC line input for Model QT-750 tables). Power Input Connections (Permanent Wiring Configuration) CAUTION! When AC power source is single-phase (e.g., US 115 V and European 230 V), do not fuse the neutral leg if permanently installed. Replace neutral wire Fuse F1 with dummy fuse, supplied with table. When two-phase AC power is used (e.g., US 240 V), both lines must be fused. For fuse charts see Chapter 5 Diagrams, Figure 5-1 for QT-740 Table and Figure 5-2 for QT-750 Table. The table can be powered from independently fused power source (mains) or from specified equipment, such as an X-ray generator. All electrical connections must be made by a qualified electrician in compliance with NEC or local code requirements. Refer to QT-740 or QT-750 Interconnection Diagram in Chapter 5, Diagrams and proceed as follows: 1. To connect external wires to table, either bring cables through the Rear Bottom Cover access opening or, if conduit and flush floor box is run beneath the table, through the large 6" x 5" opening in the table base.

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2. Route power input to Terminal Block TB1 (located on table base) terminals TB1-1 (line), TB1-2 (neutral) and TB1-3 (GND) as shown in Figure 2-1.

TERMINAL BOARD TB1

TERMINAL BOARD TB2

(REAR VIEW) POWER INPUT CABLE

Figure 2-1. Connecting Input Power Cable 3. Connect system ground wires as shown in Figure 2-4.

Figure 2-2. System Ground Wire Connections


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Re-Configuring AC Line Input Transformer (115 VAC/230 VAC Input) Typically, the AC line input transformer is configured at factory in accordance with user facility electrical requirements (i.e., 115 VAC or 230 VAC). If it is necessary to re-configure from 115 VAC to 230 VAC, or 230 VAC to 115 VAC, make connections at terminal block TB1, located on table base, as shown in Figure 2-3 and Model QT-740 and QT-750 Radiographic Table Wiring Diagrams in Chapter 5, Diagrams. In addition, on Model QT-740 tables: • For 115 VAC line input, the rating of fuse F2 and F1 should be 2 Amps, 250V slow-blow (see FFigureigure 5-1, Chapter 5, Diagrams for fuse applications chart.) • For 230 VAC line input Model QT-750 tables, the rating of fuse F2 and F1 should be 1 Amp, 250V slow-blow On Model QT-750 tables: • For 115 VAC line input, the rating of fuse F2 (and F1 if two-phase AC input) should be 6 Amps, 250V slow-blow • For 230 VAC line input Model QT-750 tables, the rating of fuse F2 and F1 should be 3 Amps, 250V slow-blow(see Figure 5-2, Chapter 5, Diagrams for fuse applications chart.) CAUTION! A "dummy fuse" should be installed in F1 fuseholder on all one-phase (with neutral) AC (Permanently Installed hard wire mains) input configurations as shown in Models QT-740 and QT-750 Radiographic Table Wiring Diagrams (see Chapter 5, DIAGRAMS). Bucky Power Input Connections To connect bucky wiring to table, route bucky cable through rear bottom cover access opening to Terminal Block TB2 (see Figure 2-1). Refer to Q740 and QT-750 Table Wiring Diagrams in Chapter 5, Diagrams and to bucky manufacturer’s installation manual (provided with system) for specific bucky wiring information. PBL Interlock Cable Connections On Model QT-750 tables using PBL interlock, connect PBL cable in accordance with QT-740 and QT-750 Table Wiring Diagrams (refer to Chapter 5, Diagrams).

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115VAC A "dummy fuse" should be installed in F1 fuseholder on all one-phase (with neutral) AC (Permanently Installed hard wire mains) input configurations as shown in Models QT-740 and QT-750 Radiographic Table Wiring Diagrams (see Chapter 5, DIAGRAMS).

IN NEUTRAL LINE GND

F1 WHITE OR DUMMY FUSE (SEE NOTE)

F2

TB1 1 2 BLACK 3 4 5 6 7 8 9 10

1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10

L1 LINE FILTER FL1 L2 GND

GREEN/YELLOW

10A, 250VAC

WHITE

1

T1

5

ORANGE

20VAC RED

2 3

6 7

ORANGE RED

110VAC 8

4

BLACK WHITE

4-62-4305 RED

1 2 3 4 5 6 7 8 9 10

ORANGE YELLOW

115 VAC INPUT: TB1 1

2

3

4

5

6

7

8

9

10

INSTALL JUMPERS BETWEEN TERMINALS 5 & 6 AND 9 & 10

230VAC

A "dummy fuse" should be installed in F1 fuseholder on all one-phase (with neutral) AC (Permanently Installed hard wire mains) input configurations as shown in Models QT-740 and QT-750 Radiographic Table Wiring Diagrams (see Chapter 5, DIAGRAMS).

IN NEUTRAL LINE GND

F1 WHITE OR DUMMY FUSE (SEE NOTE)

F2

TB1 1 2 BLACK 3 4 5 6 7 8 9 10

1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10

L1 LINE FILTER L2 FL1 GND

GREEN/YELLOW

10A, 250VAC

WHITE

1

T1

5

ORANGE

20VAC RED

2 3

6 7

ORANGE RED

110VAC 4

BLACK WHITE

8

4-62-4305 RED

1 2 3 4 5 6 7 8 9 10

ORANGE YELLOW

230 VAC INPUT: TB1 1

2

3

4

5

6

7

8

9

10

INSTALL JUMPER BETWEEN TERMINALS 6 AND 10

Figure 2-3. Connecting Input Power Cable


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TABLE LEVELING AND MOUNTING The following paragraphs describe the steps necessary to level and mount Models QT-740 and QT-750 tables. MODEL QT-740 - LEVELING AND MOUNTING INSTRUCTIONS 1. Move the QT-740 table into position according to room plan. 2. Place protective covering over boards and components located on the table base plate to prevent damage from dust and debris during drilling. 3. Using the six (6) table Base Plate 3/8" diameter mounting holes as a guide, transfer drill through the table base plate mounting holes. 4. Place a level on the table or bucky. A double-bubble level at least 18" long is recommended. If the table is not perfectly level, place the flat shim plates near the mounting locations (below the 1/2" aluminum base plate) as required until the table or bucky reads level. The shims, which measure approximately 3" x 5", are included with the table hardware kit. 5. Mount table to floor using hardware suitable for the type of floor in the installation and of sufficient strength to handle 500 lb. pull-load. MODEL QT-750 - LEVELING AND MOUNTING INSTRUCTIONS 1. Figure 5-5 in Chapter 5, DIAGRAMS shows the locations of the table mounting holes and cable through openings. Using Figure 5-5 as a guide, mark locations of the six (6) 3/8" diameter Base Plate mounting holes on the floor. 2. Drill the six (6) mounting holes as marked on floor. 3. Place Base Plate Sound-Proof Material (P/N ME30-081) into position over drilled holes. 4. Move table into position on top of Base Plate Sound-Proof Material. 5. Place a level on the table or bucky. A double-bubble level at least 18" long is recommended. 6. If the table is not perfectly level, place the flat shim plates near the mounting locations as required until the table or bucky reads level. 7. Mount table to floor using hardware suitable for the type of floor in the installation and of sufficient strength to handle 500 lb. pull-load.

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ALIGNMENT PROCEDURES IMAGE RECEPTOR/COLLIMATOR X-RAY ALIGNMENT The image receptor must be properly aligned with the projected light field of the collimator in order to provide accurate x-ray exposures. If the tube stand used with the table provides transverse travel of the x-ray tube relative to the table, set the tube transverse travel in the center detent position prior to performing alignment. The following x-ray alignment procedure may require slight repositioning of the table base. This movement may affect the position or arrangement of the leveling plates, requiring an additional check that the table remains level. Collimator calibration, tube stand alignments, and collimator light field to x-ray field adjustments, as described in their respective manuals, must be performed prior to the following procedure. 1. If the tabletop is installed, remove the radiographic portion of the tabletop, otherwise, proceed to step 2. The tabletop is held on with dual-lock tape; lift up a corner then carefully pull the tabletop off. 2. With the collimator parallel to the tabletop (0°), turn on the collimator light. Using the light field adjusting knobs on the collimator, reduce the light field to a narrow beam of light along the length of the table. 3. Position the collimator to approximately 24" source-to-image distance (SID). 4. Insert a 14" x 17" cassette into the film tray. 5. Turn on power to the table. 6. Turn on the collimator light and, if necessary, loosen mounting hardware and move the entire table so that the longitudinal center line on the cassette (i.e., the line which is parallel to the length of the table) is properly aligned with the narrow beam of light (see Figure 2-4).


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7. Move the tube stand and Receptor Cabinet simultaneously to check for continuous alignment of the narrow beam of light to the cassette center line (see Figure 2-4).

Figure 2-4. Table Longitudinal Axis Alignment 8. Remove cable tie securing the Receptor Cabinet to tabletop frame. 9. If the light beam and cassette center line are in proper alignment, Position the collimator at 40" SID. 10. Pull the cassette film tray handle out so it extends out of the front opening in table. 11. Turn on the collimator light. 12. Check for proper alignment of the image receptor centering light (emitted by the collimator) with the notch in the cassette film tray handle. If misaligned, refer to the collimator manual for alignment procedures. Tighten table mounting hardware if previously loosened.

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TABLETOP ASSEMBLY/INSTALLATION CAUTION! Be careful not to damage the Obstruction Sensors when installing the Tabletop Assembly. The following procedure describes how to install the Tabletop Assembly in the Tabletop Frame. 1. Unpack the Tabletop Assembly from the carton. 2. At the left end of the Tabletop Assembly (as viewed from front of table), remove three (3) 1/4-20 x 1" low profile socket head screws securing End Trim Plate to Tabletop End Support. Note: The front edge of table top is indicated by a label. IMPORTANT! All shims located between the Tabletop End Support and Rear Table Rail must be re-installed in exactly the same quantity and location for tabletop to be square. If not, tabletop motion may be adversely affected.


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3. Remove four (4) 1/4-20 x 3/4" socket head cap screws securing Tabletop End Support to rails and remove Tabletop End Support (see Figure 2-5). Retain all shims for re-assembly. TABLETOP END SUPPORT

END TRIM PLATE

END STOP BUMPERS

TABLE TOP ASSEMBLY (BOTTOM VIEW)

Figure 2-5. Table Top End Trim Plate and End Stop Bumpers 4. Apply power to the table. While pressing the FLOAT foot pedal (or FLOAT push button switch), push in the two float top longitudinal electromagnets so locks are in "released" position. This will provide sufficient clearance to slide the table top past the magnets. Do not loosen the longitudinal magnet mounting brackets; re-adjustment of the longitudinal brakes adjustment will be required (refer to Chapter 4, Service Maintenance for instructions). 5. Slide the Tabletop Assembly onto the bearing assemblies from the right-hand end of the table (as viewed from front of table).

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6. Install Tabletop End Support (with correct number of shims) to rails using four (4) 1/4-20 x 3/4" socket head cap screws (see Figure 2-6).

REAR TABLE RAIL

SHIMS (P/N ME11-115 (.030") AND/OR ME11194 (.010")

TABLETOP END SUPPORT

Figure 2-6. Tabletop End Support Shim Location


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NOTE: The Tabletop End Supports and Rails were assembled and properly "squared" prior to shipment from the factory. If tabletop "binding" occurs as the table top is floated longitudinally, re-check that the tabletop is square. If not, add or remove shims as required (additional shims, two .030 (ME11-115) and two .010 (ME11-194), are provided in the hardware bag included with the table). 7. Re-attach the End Trim Plate to the Tabletop Assembly. 8. Re-install the two (2) Table Top End Stop Bumpers on Tabletop Frame. 9. Remove protective backing strip from double-sided tape. 10. Install the radiographic portion of tabletop (i.e., phenolic) by carefully placing it on the Tabletop Assembly. 11. Press down firmly along all four edges of the phenolic tabletop to secure. CAUTION! Be sure dual-lock tape securing tabletop to Tabletop Assembly is completely interlocked along all four sides of table. If not, the phenolic tabletop may deflect and interfere with table "float" motion. REDUCING THE TABLE TOP HEIGHT (MODEL QT-750 ONLY) In some facilities, it may be desirable to reduce the maximum vertical height of the table top (e.g., facilities having an eight-foot ceiling and overhead tube crane). The following procedure describes how to re-configure the table up limit switch to decrease the vertical height of the table top (up to two inches lower 30.5"). 1. Locate the table Up Limit Switch S9 (behind the front side Center Ball Screw Mounting Block) and remove two screws securing the switch to the switch mounting plate. 2. Turn the switch over, rotate it 180° and then re-mount the switch to the switch mounting plate (see Figure 2-7). 3. Further adjustment of the vertical table top can be achieved by loosening the two screws securing the switch mounting plate to the table base and sliding the mounting plate forward or backward until desired table top height is attained. Secure switch plate mounting screws when table top is at correct height.

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Figure 2-7. Changing Up Limit Switch Orientation to Reduce Table Top Height


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OPERATOR CONTROL HANDLE ASSEMBLY INSTALLATION The following procedure describes how to install the Operator Control Handle Assembly on the table. 1. Loosen the black plastic knob on the Operator Control Handle Assembly. 2. Insert the rectangular mounting bracket on the rear side of the Operator Control Handle Assembly into the tabletop’s front (or rear, if desired) accessory mounting channel as shown in Figure 2-8. 3. Locate the Operator Control Handle Assembly in desired position and tighten the black plastic knob 4. Connect the Operator Control Handle Assembly plug into the circular socket (located on the right side transverse cover) and tighten. ACCESSORY CHANNEL

PLUG

OPERATOR CONTROL HANDLE ASSEMBLY

Figure 2-8. Installing the Operator Control Handle Assembly

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OPERATIONAL CHECKS AND ADJUSTMENTS

NOTE The DC Motor Driver Board A2 has five (5) trim pots identified on the printed circuit board that are factory calibrated and should not require any further adjustment.

When the table is completely assembled and all required electrical connections have been made, perform the following tests to verify proper system operation. Tests for the table’s elevating (up/down) functions and positive beam limitation (PBL) are required only on Model QT-750 tables. CHECKING TABLE FLOAT-TOP OPERATION 1. Depress the FLOAT foot pedal. The tabletop should move freely in either direction. Release the FLOAT foot pedal. The tabletop should be locked securely in its present position. 2. Depress the FLOAT push button on the Operator Control Handle Assembly. The tabletop should move freely in either direction. Release the FLOAT push button. The tabletop should be locked securely in its present position. CHECKING UP/DOWN OPERATION (MODEL QT-750 ONLY) 1. Depress the UP and then the DOWN foot pedal. The following should occur while each foot pedal is depressed: a. The tabletop should start to move up (while the UP foot pedal is pressed) and down (while the DOWN foot pedal is pressed). b. The FLOAT foot pedal (the outside pedals) should be disabled (i.e., the tabletop should remain locked) while the tabletop is moving up or down. c. With the table running either up or down, press the red Emergency Stop Switch. Table up or down motion should stop. Turn the Emergency Stop Switch counterclockwise until it is released. Tabletop up/ down motion is now enabled when foot pedals are pressed. 2. Repeat previous step using the Operator Control Handle Assembly Up/Down rocker switch. 3. While running the table down, manually activate each Down Limit Safety Switch (S7 and S10, see Figure 2-9). The table should stop driving down. 4. While running the table up, manually activate each Up Limit Safety Switch (S8 and S9, see Figure 2-9). The table should stop driving up. CAUTION! Table up/down height must be set to the heights specified in the following steps. Failure to do so can cause damage to table components. 5. With table top in fully up position, measure table top height (i.e., distance from floor to top of table). Table up height should be 32" (812.8 mm). If not, loosen two (2) screws on Up Limit Safety Switch Mounting Bracket and adjust position of the Up Limit Safety Switches. Verify correct table top height after adjustment.


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6. With table top in fully down position, measure table top height (i.e., distance from floor to top of table). Table down height should be 21.5" (546.1 mm). If not, loosen two (2) screws on Down Limit Safety Switch Mounting Bracket and adjust position of the Down Limit Safety Switches. Verify correct table top height after adjustment. TABLE UP/DOWN SPEED ADJUSTMENT (MODEL QT-750 ONLY) If an adjustment to the Up/Down motor speed is necessary, it can be accomplished by adjusting the MOTOR SPEED potentiometer A1R27 and A1R78 (on 6Way Table Control Board A1, part number AY40-030T). However, it is recommended that travel time (fully raised to fully lowered) remain in the range of between 8-14 seconds. 1. Locate the MOTOR SPEED potentiometer on 6-Way Table Control Board A1 (see Figure 5-4 in Chapter 5, Diagrams). 2. Rotating the potentiometers A1R27 (Down Motion) and A1R78 (Up Motion) clockwise (CW) increases speed, counterclockwise (CCW) rotation decreases speed.

SAFETY BRACKET (STORED LOCATION)

REDUNDANT UP LIMIT SAFETY SWITCH

UP LIMIT SAFETY SWITCH

REDUNDANT DOWN LIMIT SAFETY SWITCH

DOWN LIMIT SAFETY SWITCH

FRONT

TB3

REAR

Figure 2-9. Up/Down Limit Switch Locations PEDAL DISABLE SWITCH OPERATIONAL CHECK 1. Depress the Pedal Disable Switch until the PEDAL DISABLE SWITCH lamp illuminates. 2. Check that all foot pedal functions are disabled, and the FLOAT push button is disabled.

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3. Depress the Pedal Disable Switch until switch lamp extinguishes. 4. Check that all pedal functions and the FLOAT push button are operational. CHECKING THE OBSTRUCTION SENSORS (ELEVATING TABLE ONLY) On Model QT-750, adjustment of the four (4) Obstruction Sensors (S3-S6) was performed at the factory prior to shipment and no additional adjustment is normally required. However, in the event Obstruction Sensor adjustment becomes necessary, the following procedure is provided. The Obstruction Sensors are located at each end of the left and right Transverse Assemblies below each tabletop rail (see Figure 2-10). Proceed as follows: 1. While the table is driving down, have an assistant lift up the table top (grasping under the rail) at one corner of the table. 2. The table should stop driving down when the table top is lifted with a reasonable amount of force. 3. To adjust obstruction sensors, remove the Table Top Assembly (refer to Tabletop Assembly/Installation procedure in this chapter). 4. Loosen the lower hex nut (underside of Bearing Rail) securing the switch to the Bearing Rail. Turn the upper hex nut on obstruction switch clockwise to increase sensitivity, counterclockwise to decrease sensitivity. 5. Re-tighten the lower hex nut when adjustment is correct. 6. Re-install Tabletop Assembly (refer to Tabletop Assembly/Installation procedure in this chapter). 7. Repeat above steps for each of the other obstruction sensors.

OBSTRUCTION SENSOR

BEARING RAIL ASSEMBLY

Figure 2-10. Obstruction Sensor (Typical)


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RECEPTOR CABINET LOCKING MAGNET CHECK Verify the receptor cabinet locking magnet firmly locks the receptor cabinet along full range of travel. When magnet is released, check for sufficient clearance between the magnet and wear strip. The magnet should not contact the wear strip when released. If adjustment is required, see Figure 2-11 and proceed as follows:

ADJUST FOR APPROXIMATELY 0.04" GAP

10-32 X 1/4" PAN HEAD SCREWS (3X)

Figure 2-11. Receptor Cabinet Locking Magnet 1. Loosen the three (3) 10-32 x 1/4" pan head screws securing the Receptor Cabinet Magnet Lock Bracket to Receptor Mounting Plate. 2. Push the magnet up to fully raised (released) position. 3. Place two (2) Brake Spacer Tools, P/N TL10-002 (a piece of 0.020" shim stock) provided with the table, between magnet and wear strip. 4. Tighten the three (3) 10-32 x 1/4" pan head screws securely. 5. Re-check operation of receptor cabinet locking magnet.

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POSITIVE BEAM LIMITATION (PBL) COLLIMATORS For Positive Beam Limitation (PBL) Collimators and Elevating Tables only, verify the Vertical SID Interlock feature is functioning properly as follows: 1. Place a 14" x 17" film cassette into the cassette tray and insert the cassette tray into the Receptor Cabinet. 2. Turn on power to the table. 3. Raise the table until it stops. 4. Position the collimator to 40" SID to table image receptor (40" SID LED indicator on tube stand handgrips should be illuminated). 5. The collimator should indicate it is ready for exposure. 6. Depress the DOWN foot pedal. The collimator should now indicate it is not ready for exposure. 7. Try to take an x-ray exposure and verify that no exposure is possible.

MODEL QT-750 COVERS INSTALLATION/ADJUSTMENT PROCEDURE Proceed as follows after completing all wiring, alignment, and assembly operations: 1. Raise table to full up position. 2. Attach the Lower Rear Cover to aluminum base plate using five (5) 10-32 x 3/8" screws with external tooth star washers (see Figure 2-12). Do not fully tighten screws at this time.

LOWER FRONT COVER

LOWER REAR COVER

Figure 2-12. Table Lower Front and Rear Covers Installed


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3. Attach the Lower Front Cover to aluminum base plate using four (4) 10-32 x 3/8" screws with external tooth star washers (see Figure 2-12). Do not fully tighten screws at this time. 4. Attach two (2) Lower Side Covers to Lower Front and Lower Rear Covers using four (4) 6-32 x 3/8" screws with external tooth star washers in each Lower Side Cover (see Figure 2-13). LOWER LEFT COVER

LOWER RIGHT COVER

Figure 2-13. Table Lower Left and Right Covers Installed 5. Lower the table top to check that Scissors Assembly does not interfere with Lower Front and Rear Covers. Adjust covers as necessary. When covers are correctly positioned, tighten all hardware securing lower covers. 6. Attach Upper Front Cover to the tabletop frame using four (4) 10-32 x 3/8" screws with external tooth star washers. Do not fully tighten screws at this time. 7.

Attach Upper Rear Cover to tabletop frame using two (2) 10-32 x 3/8" screws and external tooth star washers. Do not fully tighten screws at this time.

8. Attach Upper Front Cover to Upper Rear Cover using two (2) 8-32 x 3/8" screws and external tooth star washers (see Figure 2-14). Tighten all hardware securing upper covers. 9. Verify there is adequate clearance for the top covers; test run the table up and down while checking for interference between upper and lower covers. If adjustment is necessary, remove upper covers, then loosen screws securing lower front and rear covers. Adjust lower covers in or out on slots, as required. Tighten all lower cover hardware, re-assemble upper covers and re-check for interference.

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UPPER REAR COVER

Figure 2-14. Upper Rear Cover Installed

MODEL QT-740 COVERS INSTALLATION PROCEDURE Proceed as follows after completing all wiring, alignment, and assembly operations: 1. Attach the Lower Rear Cover to aluminum base plate using five (5) 10-32 x 3/ 8" screws with external tooth star washers (see Figure 2-12). Do not fully tighten screws at this time. 2. Attach the Lower Front Cover to aluminum base plate using four (4) 10-32 x 3/8" screws with external tooth star washers (see Figure 2-12). Do not fully tighten screws at this time. 3. Attach two (2) Lower Side Covers to Lower Front and Lower Rear Covers using four (4) 6-32 x 3/8" screws with external tooth star washers in each Lower Side Cover (see Figure 2-13). 4. Adjust covers as necessary. When covers are correctly positioned, tighten all hardware securing lower covers. 5. Attach Upper Front Cover to the tabletop frame using four (4) 10-32 x 3/8" screws with external tooth star washers. Do not fully tighten screws at this time. 6. Attach Upper Rear Cover to tabletop frame using two (2) 10-32 x 3/8" screws. Do not fully tighten screws at this time. 7. Attach Upper Front Cover to upper Rear Cover using two (2) 8-32 x 3/8" screws and external tooth star washers (see Figure 2-14). Tighten all upper cover hardware.


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Chapter

3

THEORY OF OPERATION

3-1

3-2

Chapter 3 Theory of Operation

OVERVIEW Model QT-740 and QT-750 radiographic tables feature a tabletop that "floats" in four directions for transverse and longitudinal patient positioning. The tabletop of Model QT-750 can also be raised and lowered. The tabletop floats (rides) on 30 bearings; 26 provide longitudinal tabletop motion, and four are provided for transverse (forward and backward) tabletop motion. The longitudinal bearings are bolted to two precision-machined stainless steel bearing bars, which are mounted below the tabletop on the front and back sides of the table. Four 1-5/8" load bearings bolted on the Transverse Carriage Assembly permit transverse travel of the tabletop. Eight anti-racking and four anti-tipping guide bearings, bolted to the Transverse Carriage Assembly, stabilize tabletop transverse motion by controlling movement of the left and right Transverse Rails. Two fail-safe brakes (24 VDC electromagnets) are positioned extremely close to the bearing bars. When the electromagnets are de-activated (i.e., FLOAT foot pedal/push button is not pressed), the fail-safe brakes "grab" the bearing bar securely, locking the longitudinal travel of the table. Similarly, four fail-safe brakes (24 VDC electromagnets) are used to grab the Transverse Rails, locking the transverse travel of the table. Depressing either the FLOAT foot pedal(s) or FLOAT push button energizes the electromagnets, releasing the fail-safe brakes and allowing the tabletop to float freely both longitudinally and transversely. The Receptor Cabinet rides on four linear ball-bearings mounted to adjustable brackets attached to either side of the cabinet. These bearings travel on the hardened and polished steel shafts of the Receptor Cabinet Carriage. One electromagnet on the underside of the housing "locks" the Receptor Cabinet into place until the Receptor Cabinet Lock Release switch is depressed, thereby releasing the magnet's hold and allowing free movement of the Receptor Cabinet. The following paragraphs provide theory of operation for Model QT-740 and Model QT-750 radiographic tables. MODEL QT-740 TABLE NOTE The table power supply cord is the power disconnect device. If hard wiring system power connection, the disconnect device is facility-provided external circuit breaker or shutoff switch.

The table's major electrical components include the AC transformer and fuse block, printed circuit boards, and magnetic locks. See Figures 5-1 and 5-3 in Chapter 5, Diagrams. Power Distribution 115/230 VAC line input is applied through fuses F1 and F2 to step-down transformer T1. Transformer T1 provides 18 VAC to 4-Way Table Control Board connector A1J1-1 and A1J1-2. The 18 VAC input is applied to full-wave bridge rectifier A1DB1, filtered by A1C1 and A1R1, and applied through resistor A1R2 and zener diode A1D1 to produce +12 VDC. The +24 VDC output of A1DB1 is connected to A1J1-6 and A1J1-10 to provide +24 VDC to the bucky, transverse, and longitudinal electromagnets.

Models QT-740 & QT-750 - Service Manual Quantum Medical Imaging, LLC

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Float Control Model QT-740 tables have one foot pedal and one push button switch (located on the Operator Control Handle Assembly) that control four-way float top operation. Pressing the foot pedal operates switches S1 and S2, and pressing the push button switch operates switch S3. When S1, S2, or S3 is activated, a negative-going level is applied through normally open (N.O.) PEDAL DISABLE switch S4 and FLOAT switch S1, S2, or S3 to A1C3, which generates a negative-going pulse at one-shot A1U1-2 on 4-Way Table Control Board A1. One-shot A1U1-3 produces a 47-second pulse that turns on FET A1Q1, which provides drive current for the +24 VDC transverse and longitudinal electromagnets. The magnets release the mechanical brakes, allowing tabletop "float" motion. After 47 seconds, or releasing the FLOAT foot pedal or push button (which applies a negative-going level to A1U1-4, resetting A1U1) A1Q1 turns off. The magnets de-energize and lock preventing tabletop "float" motion. Foot Pedal Disable Circuit A Foot Pedal Disable Switch S4 is located below the table rail on the left end of the table. Pressing the switch until PEDAL DISABLE SWITCH lamp DS2 is illuminated disconnects FLOAT switches S1, S2, and S3 thereby disabling FLOAT foot pedal and FLOAT push button operation. When the patient is in the correct location for x-ray, disabling the FLOAT foot pedal push button prevents inadvertent activation of the pedal. When Foot Pedal Disable Switch lamp DS2 is not illuminated, the FLOAT foot pedal and push button are fully operational. Receptor Cabinet Lock The Receptor Cabinet magnetic lock has its own release switch (S5) for Receptor Cabinet positioning. When S5 is pressed, the Receptor Cabinet locking magnet is de-energized enabling cabinet movement. MODEL QT-750 TABLE The table's major electrical components include the AC transformer and fuse block, printed circuit boards, magnetic locks, and DC motor. Vertical table motion is performed by a motor-driven twin lead screw assembly mounted on the table base. The DC motor drives the twin lead screw assembly via belt connection, which extends (upward) and retracts (downward) the Scissors Assembly when the UP or DOWN foot pedal, respectively, is depressed. See Figures 5-2 and 5-4 in Chapter 5, Diagrams. Power Distribution 115/230 VAC line input is applied through terminal board TB1, fuses F1 and F2, and line filter FL1 and to AC transformer T1. Transformer T1 provides 20 VAC to 6-Way Table Control Board A1. Transformer T1 also provides 110 VAC to DC Motor Driver A2 (AC terminals) and to 6-Way Table Control Board connector A1J115 and A1J1-16.

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Voltage Regulation From AC transformer T1, 20 VAC is supplied to 6-Way Table Control Board A1 at connector pins A1J5-1 and A1J5-3 (see Figure 5-2). Fuse protection for 20 VAC input is provided by fuse A1F2. Float Control Model QT-750 tables have two FLOAT foot pedals, which operate switches S11 and S12 and a FLOAT push button switch (S13) located on the Operator Control Handle Assembly, attached to the tabletop accessory rail. When S11, S12, or S13 is activated, a low FLOAT signal is applied through 6-Way Table Control Board connector A1J2-18. This signal triggers a one-shot that produces a 47 second pulse, which provides drive current for the +24 VDC transverse and longitudinal electromagnets. The magnets release the mechanical brakes allowing tabletop "float" motion. When the FLOAT push button is released, or after 47 seconds of continuous activation (i.e., after the one-shot times out) the magnets are deenergized and the fail-safe brakes lock, inhibiting tabletop "float" motion. Foot Pedal Disable Switch Foot Pedal Disable Switch S14 is located below the table rail on the left end of the table. Pressing the switch until the PEDAL DISABLE SWITCH lamp DS2 is illuminated disables foot pedal operation. When the patient is in the correct location for x-ray, disabling the foot pedals prevents inadvertent activation of the pedals. When the Foot Pedal Disable Switch lamp DS2 is not illuminated, the foot pedals are fully operational. Positive Beam Limitation When the table is used in a PBL system, the UP LIMIT signal is used to prevent exposures when the table is not in its full up position (i.e., at 40" SID). Relay A1K8 is energized when the table is at its maximum up position (as indicated when the /UP LIMIT signal is active low) to indicate the 40" SID position via relay contact closure at A1J4-1 and A1J4-2. This contact closure is then fed to the table's PBL circuit to indicate the 40" SID position. Receptor Cabinet Lock The Receptor Cabinet magnetic lock has its own release switch (S15) for Receptor Cabinet positioning. When S15 is pressed, the Receptor Cabinet locking magnet is de-energized enabling cabinet movement. Emergency Stop Switch The Emergency Stop switch (S16) is a two-position push-button switch connected across the 110 VAC secondary of transformer T1. Pressing the switch breaks the 110 VAC input connection applied to DC Motor Driver Board A2 (at one AC terminal) thereby removing power from the table DC motor drive circuit. To restore power, the switch must be manually released to the normally closed position.


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In addition to providing an emergency shut-off function, the Emergency Stop Switch serves as an indicator lamp that flashes at a 1-Hertz rate in the event one of the following "faults" occur: •

Any of the obstruction sensors (S3 - S6) are activated (during tabletop down movement)

•

A drive belt fault condition occurs (i.e. snapped or disengaged belt), sensed by normally-closed MOTOR BELT switch S22

•

A sync belt fault condition occurs (i.e. snapped or disengaged belt), sensed by normally-closed SYNC BELT switch S23

•

DC Motor over-temperature fault occurs (motor temperature exceeds 70°C), sensed by DC Motor thermal switch S21

•

The 20 VAC input from transformer T1 falls below 15% nominal

•

Redundant down limit switch S10 or redundant up limit switch S8 is activated

When any of the above conditions occur, a low-to-high transition is applied to a 1-Hz square wave oscillator/transistor circuit on Table Control Board A1, which generates the FL+EM SW signal that drives the EMERGENCY SWITCH LAMP DS1 through connector A1J2-20.

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Chapter

4

SERVICE INSTRUCTIONS

4-1

4-2

Chapter 4 Service Instructions

OVERVIEW This chapter provides instructions to assist the service technician in maintaining the smooth operation of the table. The table will function reliably when maintained according to the instructions provided in this chapter. Only properly trained service personnel should service or maintain this equipment. Safe equipment performance requires the attention of service personnel who are specifically trained and experienced with medical x-ray apparatus. Applicable preventive maintenance or any repair service should be performed by these skilled individuals. Failure to follow manufacturer’s or service personnel’s recommendations may result in serious injury. WARNING! Personnel engaged in maintenance activities should exercise normal caution and care while working with electromechanical equipment. Before removing or opening any electrical power panels or covers, verify that the incoming power supply is turned OFF. In the event maintenance procedures require power to be supplied to the unit, extreme care MUST be exercised to insure the safety of service or other personnel in the area. When working on the Scissors Assembly, be sure the Safety Bracket is installed as shown in Figure 4-1. Verify that the equipment is properly grounded before attempting any electrical operation.

SAFETY BRACKET

Figure 4-1. Safety Bracket Installed


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SERVICE MAINTENANCE WARNING! Always disconnect the equipment from the main power supply prior to any cleaning. Visual Inspection A complete series of inspections and functional checks was conducted at installation to insure proper operation of the system. The following inspection and adjustment procedures are recommended to maintain the system in its original operating condition. Perform Every Six Months: •Check for evidence of loose hardware or loose wires •Check all bearings and bearing surfaces for cleanliness and corrosion •Clean Bearing Tracks •Conduct a general inspection for worn or damaged parts •Inspect Drive and Sync belts for wear, cracks, looseness •Check for smoothness of Receptor Cabinet motion •Verify that all ground conductors are properly and securely installed and free of corrosion or damage •Check all electrical cabling and wiring for wear and fraying •Perform a functional test and check table vertical travel (Model QT-750 only) •Perform float top locking magnet operational check (refer to "Float Top Locking Magnet Check" procedure in this chapter) •Check external covers for proper fit; inspect for scratches that may indicate cover misalignment or damage caused by collisions with footstools, trolleys, or other equipment Functional Check for Model QT-750 Elevating Tables 1. Raise the table to the full up position and then turn power off. 2. Remove the upper and lower covers from the table. WARNING! On Model QT-750 tables, a Safety Bracket (mounted on the QT-750 table base plate) is used to prevent collapse of the Scissors Assembly onto the table base plate during servicing. Verify Safety Bracket is in place as shown in Figure 4-1 prior to servicing around or below the Scissors Assembly. 3. Check mounting hardware that mounts table base to the floor for a secure, tight fit. Be sure to check all six (6) mounting points. 4. Lubricate two (2) Lead Screw shafts using NGLI no. 1 grease (Superlube® Multipurpose Grease, Lubriplate MAG-1 Polymer Grease, or equivalent).

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5. Lubricate points as shown in Figures 4-2 and 4-3. Use light weight machine quality oil only!

Figure 4-2. Lubrication Points - Table Frame Thompson Shafts 6. Turn power on to the table.

Figure 4-3. Lubrication Points - Bucky Thompson Shafts


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WARNING! Exercise extreme care to insure the safety of service or other personnel in the area. DO NOT insert hands, tools, etc., into the Scissors Assembly area while power is on. 7. Check table travel by driving the table down and then up. Make sure that nothing is binding or pulling during the up/down travel movement. 8. On PBL systems, verify table/collimator S.I.D. Interlock feature operates correctly. 9. Replace the upper and lower table covers (refer to Chapter 2, Assembly and Installation). 10. Place a loaded cassette into the bucky tray and take a projection. Inspect the film to determine whether the bucky and collimator are still in alignment. Lubrication Model QT-750 tables require lubrication at the locations shown in Figures 4-2 and 4-3 at least every twelve months. Model QT-740 requires lubrication at the locations shown in Figure 4-3 at least every twelve months. Float Top Locking Magnet Check With power applied to table, check holding force of floating table top in both longitudinal (left-to-right) and transverse (front-to-back) directions. If holding force is not sufficient, adjust Float Top Locking Magnets as follows:

Note: Both the front and rear Longitudinal Magnets must be aligned at the same time. 1. Starting at one corner, lift the phenolic table top up and then gradually pull the top apart from dual-lock tape attached to table rails. Place table top to the side. 2. Loosen the two (2) hex head bolts securing each Longitudinal Magnet Bracket to Transverse Rails. 3. Place Brake Spacer Tool P/N TL10-002 (a piece of 0.020" shim stock), provided with the table, between magnet and Brake Shoe as shown in Figure 4-4). 4. Press float foot pedal. The magnet should release from Brake Shoe. If not, push against magnet until it releases.

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5. Slide the Longitudinal Magnet Bracket toward Tabletop Rail until Magnet just contacts the shim. Ensure Brake Pad is parallel with respect to rail. 6. Tighten two (2) hex head screws in Longitudinal Magnet Bracket.

SPACER TOOL TL10-002 (SEE DETAIL BELOW)

LONGITUDINAL MAGNET BRACKET

TABLETOP RAIL

MAGNET

BRAKE SHOE

TL10-002

SPACER TOOL, LONGITUDINAL BRAKE

Figure 4-4. Adjusting the Longitudinal (Float) Magnets


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TROUBLESHOOTING PROCEDURE The following table provides instructions for troubleshooting various problems that could be encountered on Model QT-740 and/or QT-750 radiographic tables. Refer to Chapter 6, Diagrams for the locations of the LEDs mentioned in this table. Table 4-1. Troubleshooting Information

PROBLEM/INDICATION

ACTION

Emergency Shut-off Switch lamp is flashing

QT-750

6-Way Table Control Board AY40-030T contains various status/error LEDs to indicate current operational status of the table and to identify particular error types. The steps that follow provide a description of each LED indicator and suggests an appropriate action in the event the indicator is lit.

Error LED D12 (OBS SENS #1) is lit and error LED D53 (EMERG.) is flashing

QT-750

This LED is lit when front left obstruction sensor is activated: 1. Remove obstruction. 2. Adjust front left obstruction sensor.


QT-750

This LED is lit when rear left obstruction sensor is activated: 1. Remove obstruction. 2. Adjust rear left obstruction sensor.


QT-750

This LED is lit when front right obstruction sensor is activated: 1. Remove obstruction. 2. Adjust front right obstruction sensor.


QT-750

This LED is lit when rear right obstruction sensor is activated: 1. Remove obstruction. 2. Adjust rear right obstruction sensor.

Status LED D32 (DN LMT) is lit

QT-750

This LED is lit when table top is at "normal" down limit. No action is required; this is a normal condition when table is in down position.

Status LED D36 (UP LMT) is lit

QT-750

This LED is lit when table top is at "normal" up limit. No action is required; this is a normal condition when table is in up position.

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TABLE MODEL



Table 4-1. Troubleshooting Information

PROBLEM/INDICATION

TABLE MODEL

ACTION

Status LED D42 (PEDDIS) is lit

QT-750

No action is required; this is a normal condition when Foot Pedal/Operator Control Handle Disable Switch is activated. Pedal/Operator Control Handle disabled = ON Pedal/Operator Control Handle enabled = OFF

Status LED D48 (FLOAT) is lit

QT-750

This LED is lit when table top "float" function is not active. No action is required; this is a normal condition when Float Foot Pedal or Operator Control Handle FLOAT Push button is not pushed in.

Error LED D51 (BELTS) is lit and error LED D53 (EMERG.) is flashing

QT-750

This LED is lit when the Drive or Sync belt sensor is activated, or drive motor thermal sensor is activated, or transformer A1T1 input voltage falls below required operational voltage. Perform following checks: 1.Check if a drive belt fault condition occurred (i.e. snapped or disengaged belt), sensed by normally-closed MOTOR BELT switch S22. 2.Check if a sync belt fault condition occurred (i.e. snapped or disengaged belt), sensed by normally-closed SYNC BELT switch S23. 3.If no belt fault is found, a DC Motor overtemperature fault may have occurred (motor temperature exceeds 70°C), sensed by DC Motor thermal switch S21. Allow DC Motor to cool, then re-check table operation. If still not operating, remove power from table and check S21 with ohmmeter. If open, replace S21. 4.If none of the above, the 20 VAC input from transformer T1 may have dropped below 15% nominal. Check for 110 VAC across terminals L1 and L2 on DC Motor Driver Board A2, and also on 6-Way Table Control Board A1 connector J1, across pins 15 and 16.

Error LED D53 (EMERG.) is lit steady and Emergency shut-off switch is activated.

QT-750

Release Emergency Switch, error light should extinguish.


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PROBLEM/INDICATION

TABLE MODEL

ACTION

Error LED D56 (U/D LMT) is lit and error LED D53 (EMERG.) is flashing

QT-750

This LED is lit when table top redundant down limit switch S10 or redundant up limit switch S8 was activated, indicating excessive table up/down speed or a failure or mis-alignment of primary up limit switch S9 or primary down limit switch S7. To regain table movement, deactivate the activated redundant switch (i.e., S10 or S8) then move table up or down as required until table top height is within normal operating height range. Check table speed and adjust as required (i.e., readjust MOTOR SPEED potentiometers A1R27 (Down Motion) and A1R78 (Up Motion) on 6Way Table Control Board A1). It is recommended that the travel time (fully raised to fully lowered) remain in the range of between 8-14 seconds.

Status LED D31 (BRAKE) is lit

QT-750

Power is applied to three fail-safe brakes (i.e., brakes are in released state). No action is required; this is a normal condition during table top up/down motion.

Table does not drive up or down; error LED D53 (EMERG.) is flashing.

QT-750

1. Check if the Emergency Shut-off switch is activated (Emergency Shut-off switch indicator light is illuminated, D53 is flashing). 2.Check Up foot pedal connections at connector pins A1J2-1 and A1J2-15 and Down foot pedal connections at pins A1J2-11 and A1J2-15. 3.Check for loose pin connection on 6-Way Table Control Board A1 connector J1 (pins 10 and 2 to DC Motor, and pins 8 and 14 to Motor Brake).

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PROBLEM/INDICATION Table does not drive up or down; error LED D53 (EMERG.) not flashing.

TABLE MODEL QT-750


ACTION 1.Verify the following: a. AC supply to DC Motor Driver Board A2 is normal (110 to 120 VAC during standby; 100 VAC when driving up or down). b. DC supply on DC Motor Driver Board A2 is normal (160 to 165 Vdc during standby; approx. 145 Vdc when driving up or down). c. A normal "speed command" input voltage as measured between S1(L) and S2(W) on the DC Motor Driver Board A2 (0 Vdc during standby; between 4.5 and 12.0 Vdc when driving up or down). 2. If above appear normal, and an insufficient sag in the DC occurs, do the following: a. Disconnect the A+ and A- leads from the Minarik DC Motor Driver Board A2. b. Measure Ohms across the leads you removed as you command a vertical motion. Once the control relays are activated, the motor armature's input impedance (Low Ohms) should appear on these leads. c. If no change occurs, the problem is in the current path to the motor. If a low ohms reading does occur and no motion or a slow motion occurs, replace the defective DC Motor Driver Board A2.

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PROBLEM/INDICATION

TABLE MODEL

ACTION

Table drives up and down, but tabletop does not float.

QT-750

1.Check if the Emergency Shut-off switch is activated (Emergency Shut-off switch indicator light is illuminated, D53 is flashing). 2.Check +24 vdc supply fuses A1F1 (8A) and A1F2 (10A) on 6-Way Table Control Board A1. 3.Verify 20 vac is present across 6-Way Table Control Board A1 connector J5 pins 1 and 3. 4.Verify +24 vdc is present across 6-Way Table Control Board A1 connector J3 pins 1 and 8 (for Transverse Magnet) and connector J3 pins 5 and 6 (for Longitudinal Magnet). 5.Check if transistors Q1 and Q3 on 6-Way Table Control Board A1 are shorted.

No Power to the Table

QT-740, QT-750

1.Check for correct incoming line voltage at terminal block TB1-1 and TB1-2. 2.Check line input fuses F1 and F2. 3.Check for 115 VAC across TB1-5 and TB1-9. If not present, replace line filter. 4.Check 115 vac and 20 vac outputs of AC Input Transformer T1: measure for 110 vac across 6-Way Table Control Board A1 connector J1-15 and Emergency Shut-off switch terminal 1. Measure 20 vac across 6-Way Table Control Board A1 connector J5 pins 1 and 3.

Image Receptor Cabinet lock not working

QT-740, QT-750

1.Verify +24 vdc is present across 6-Way Table Control Board A1 connector J3 pins 2 and 9. 2.Check +24 vdc supply fuse A1F1 on 6-Way Table Control Board A1. 3.Check Bucky Switch S15 and bucky electromagnet.

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PROBLEM/INDICATION

TABLE MODEL

ACTION

Table drives up, does not drive down; status LED D36 (UP LMT) is lit, error LED D56 (U/D LMT) is not lit

QT-750

1.While activating Down Foot Pedal, monitor voltage across 6-Way Table Control Board connector J2 pins 11 and 15 to verify operation of Down Pedal Switch S2. Replace switch if faulty. If switch is good, proceed with next step. 2.Check signal at TP6 on 6-Way Table Control Board A1 while activating DOWN foot pedal. It should toggle between high (+15 vdc) when pedal is activated and low (approx. 0 vdc) when pedal is not activated. If not, replace A1 board.

Table drives down, does not drive up; status LED D32 (DN LMT) is lit, error LED D56 (U/D LMT) is not lit.

QT-750

1.While activating Up Foot Pedal, monitor voltage across 6-Way Table Control Board connector J2 pins 1 and 15 to verify operation of Up Pedal Switch S1. Replace switch if faulty. If switch is good, proceed with next step. 2.Check signal on TP3 on 6-Way Table Control Board A1 while activating UP foot pedal. It should toggle between high (+15 vdc) when pedal is activated and low (approx. 0 vdc) when pedal is not activated. If not, replace A1 board.

Float Top Locking Magnets not holding sufficiently.

QT-740, QT-750

Refer to "Float Top Locking Magnet Check" procedure in this chapter for Float Top Locking Magnet adjustment instructions.


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REMOVAL/REPLACEMENT PROCEDURES The following procedures provide step-by-step instructions for removal and replacement of the repairable components in the table. Replacing the Drive Belt (Model QT-750 Tables Only) WARNING! Make sure to remove any objects from the tabletop before continuing. 1. Raise the table to the full up position and then turn power off. 2. Remove upper and lower table covers. 3. Install Service Safety Bracket. 4. Remove four (4) hex bolts securing the DC Motor to Table Base Plate (see Figure 4-5). 5. Remove Drive Belt from pulley. 6. Install replacement Drive Belt on pulley. 7. Install, but do not tighten, four (4) hex bolts securing DC Motor to the Table Base Plate. 8. Adjust belt tension by sliding DC Motor toward front end of Table Base Plate. When belt tension is set, tighten DC Motor mounting screws. DC MOTOR DRIVE BELT

DC MOTOR MOUNTING SCREWS (4X)

Figure 4-5. DC Motor Location 9. Verify Drive Belt Safety Switch is in open position (if not, motor will not operate).

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10. Remove Safety Bracket. 11. Reinstall upper and lower table covers (refer to Chapter 2, Assembly and Installation). 12. Turn on power. Perform an operational test and check table travel and positions. Replacing the Sync Belt (Model QT-750 Tables Only) WARNING! Remove any objects from the tabletop before continuing. 1. Raise the table to the full up position and then turn power off. 2. Remove upper and lower table covers. 3. Install Service Safety Bracket. 4. Remove four (4) hex bolts securing the DC Motor to the Table Base Plate (see Figure 4-5). 5. Remove Drive Belt from pulley. 6. Loosen two (2) bolts securing Sync Belt Switch Bracket (see Figure 4-6) and remove Sync Belt Switch Bracket and set aside. (Do not disconnect switch wires). SYNC BELT SWITCH BRACKET

BELT TENSIONER

Figure 4-6. Location of Sync Belt Switch Bracket and Tensioner


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7. Loosen nut on Belt Tensioner to create slack in belt (see Figure 4-6). If necessary, remove Belt Tensioner to achieve sufficient slack for belt removal. 8. Loosen two (2) 1/4-20 socket head cap screws securing Ball Screw Mounting Block at pulley end of Lead Screw to Base Plate (see Figure 4-7). Gently tap Block to remove it from Lead Screw. 9. Remove Sync Belt from pulleys. 10. Install replacement Sync Belt on pulleys. 11. Verify the distance between Ball Nut Blocks and center Ball Screw Mounting Blocks (see Figure 4-7) are equal (±0.003"). If not, rotate either shaft until distances are equal (within tolerance). This is to ensure equal torque on both Lead Screws. 12. Install Ball Screw Mounting Block on pulley end of Lead Screw and secure to Table Base Plate using two (2) 1/4-20 socket head cap screws.

BALL NUT BLOCKS

CENTER BALL SCREW MOUNTING BLOCK

BALL SCREW MOUNTING BLOCK

Figure 4-7. Ball Nut and Screw Mounting Block Locations 13. Re-install Belt Tensioner (if removed). Adjust belt tension as follows: a. If not already done so, loosen nut on Belt Tensioner. b. Increase belt tension by adjusting Belt Tensioner downward. The belt is properly tensioned when, at the midpoint of the longest belt span, there is approximately 1/4" deflection.

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c.

When belt tension is set, tighten nut on Belt Tensioner.

14. Verify Sync Belt Safety Switch is in open position (if not, motor will not operate). 15. Remove Safety Bracket. 16. Reinstall upper and lower table covers (refer to Chapter 2, Assembly and Installation). 17. Turn on power. Perform an operational test and check table travel and positions. Replacing the DC Motor (Model QT-750 Tables Only) 1. Raise the table to the full up position and then turn power off. 2. Remove upper and lower table covers. 3. Install Service Safety Bracket. 4. Cut the two DC Motor wires connected to 6-Way Table Control Board A1 connectors A1J1-12 and A1J1-10. 5. Remove four (4) hex bolts securing the DC Motor to the Table Base Plate (see Figure 4-5). 6. Remove Drive Belt from DC Motor pulley. 7. Loosen set screw securing pulley to motor shaft and remove pulley from shaft. Retain pulley (and key) for re-assembly. 8. Slide pulley (with key inserted) onto shaft of replacement DC Motor. 9. Reinstall Drive Belt on DC Motor Pulley. 10. Mount DC Motor to Table Base Plate using four (4) hex bolts. 11. Be sure pulley on DC Motor is aligned with pulley on Lead Screw to within ±1/16". After adjusting pulley position, tighten set screw on DC Motor pulley. 12. Connect replacement DC Motor wires to 6-Way Table Control Board connector A1J1-12 and A1J1-10. 13. Verify Drive Belt Safety Switch is in open position (if not, motor will not operate). 14. Remove Safety Bracket. 15. Reinstall upper and lower table covers (refer to Chapter 2, Assembly and Installation). 16. Turn on power. Perform an operational test and check table travel and positions.


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Replacing the DC Motor Driver Board A2 (Model QT-750 Tables Only) There are two different types of DC Motor Driver Boards used on QT-750 tables; Bodine-manufactured type and Minarik manufactured type. A key distinguishing characteristic to determine the type installed is the electrical connector; Bodine uses a DIN type connector having nine screw-down terminals, Minarik uses three separate "STACON" type terminals (see Figures 4-8 and 4-9).

Bodine-Manufactured DC Motor Driver Board Removal/Replacement . POTENTIOMETERS ACCEL. MIN. SPEED MAX. SPEED TORQUE SPEED REG.

Figure 4-8. DC Motor Driver Board A2 Layout (Bodine-manufactured) To replace the DC Motor Driver Board A2, proceed as follows: 1. Raise the table to the full up position and then turn power off. 2. Remove upper and lower table covers. 3. Install Service Safety Bracket (see Figure 4-1). WARNING! To prevent electrical shock, make sure power is off and all capacitors are discharged before proceeding. 4. Disconnect plug from connector on DC Motor Driver Board A2.

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5. Remove four (4) screws securing DC Motor Driver Board A2 to Board Mounting Bracket and remove board. Retain screws for reassembly. 6. On replacement DC Motor Driver Board A2, adjust five potentiometers as follows (see Figure 4-8): a. Set ACCEL pot. to mid-range (half-way) b. Set MIN. SPEED pot. to mid-range (half-way) c.

Set MAX. SPEED pot. to mid-range (half-way)

d. Set TORQUE pot. fully counter-clockwise e. Set SPEED REG. pot. fully counter-clockwise 7. Set DIP switches 1-8 on DC Motor Driver Board A2 as follows: 1 2 3 4

= = = =

OFF ON ON OFF

5 6 7 8

= = = =

ON OFF OFF ON

8. Position replacement DC Motor Driver Board A2 on Board Mounting Bracket and secure using screws removed in previous step. 9. Connect plug into connector on DC Motor Driver Board A2. 10. Remove Safety Bracket. 11. Turn on power. Perform an operational test and check table travel and positions. 12. If necessary, readjust MOTOR SPEED potentiometer A1R27 (Down Speed Motion Control) and MOTOR SPEED potentiometer A1R78 (Up Speed Motion Control) on 6-Way Table Control Board A1. It is recommended that the travel time (fully raised to fully lowered) remain in the range of between 8-14 seconds. Also, the MIN. SPEED and/or MAX. SPEED potentiometers on DC Motor Driver Board A2 may be adjusted to increase/decrease acceleration, but do not increase either beyond half-way. 13. Reinstall upper and lower table covers (refer to Chapter 2, Assembly and Installation).


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Minarik-Manufactured DC Motor Driver Board Removal/Replacement.

IR COMP POTENTIOMETER

YEL RED/GRN WHT/BLK BRN BRN/YEL (S1 to S2: +4.5 to +12 VDC when driving up/down)

TOP

CURRENT LIMIT

L

W

H

CCW STO P

S1

S2

S3

MAX SPEED

Q502

R504

R501

IR COMP R503

D501

C502

CW STO P

R502

RED

A+

+DC IN

-DC IN

RED/GRN 160-165 VDC (Sags to 145 VDC during motor operation)

TO ARMATURE via Control PCB (MEASURE AT TP1 & TP2)

A-

black

red

LINE VOLTAGE

TRIM PO T

Q501

+ C503

C504

ACCEL/DECEL

Measure DC Supply Voltage between these two points

12 o'clock

Figure 4-9. DC Motor Driver Board A2 Layout (Minarik-manufactured) To replace the DC Motor Driver Board A2, refer to Figure 4-9 and proceed as follows: 1. Raise the table to the full up position and then turn power off. 2. Remove upper and lower table covers. 3. Install Service Safety Bracket (see Figure 4-1).

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WARNING! To prevent electrical shock, make sure power is off and all capacitors are discharged before proceeding. 4. Disconnect seven "STACON" type connectors from terminals on DC Motor Driver Board A2. 5. Remove four (4) screws securing DC Motor Driver Board A2 to Board Mounting Bracket and remove board. Retain screws for reassembly. 6. On replacement DC Motor Driver Board A2, viewing each potentiometer as a clock-face, set the pointers to the following initial o'clock positions, where 12:00 o'clock is pointing straight up (see Figure 4-9), set each as follows: •

Max Speed

6:00 (fully clockwise)

•

Current Limit

4:00

•

Accel/Decel

3:30

•

IR Comp

4:00

7. Position replacement DC Motor Driver Board A2 on Board Mounting Bracket and secure using screws removed in previous step. 8. Re-connect seven STACON connectors to terminals on DC Motor Driver Board A2. 9. Remove Safety Bracket. 10. Turn on power. 11. On DC Motor Driver Board A2, measure the DC voltage across S1 (L) and S2 (W). Adjust the Motor Speed potentiometer A1R27 (Down) located on Table Control Board A1 (AY40-030T), to 10 seconds when driving table down. Use potentiometer A1R78 (Up) to adjust motor speed to 8 seconds when driving table up (recommended). Any speed between 8-14 seconds is acceptable. Table 4-2. Minarik DC Motor Driver Board Normal Voltage Levels

Test Points

Location & Function

Standby

Driving Up or Down

AC (~) to AC (~)

Motor Controller Bridge Rectifier

110 - 120 VAC

> 100VAC

DC+ to DC-

Motor Controller Power Supply

160 - 165 Vdc

Sags to ~145 Vdc

S1(L) to S2(W)

Motor Controller Speed Command

A+ to A-

Motor Controller Output to Motor

TP1 to TP2

6-Way Table Control Board A1 Drive IN


0 Vdc

+4.5 Vdc to +12.0 Vdc

0 Vdc

70 Vdc (±50 Vdc) varies with load and speed

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12. Following this adjustment, you should obtain: a. Smooth ramp-up and ramp-down occurring at the beginning and end of each motion command. b. No tendency to roll backward before forward, when accelerating in either direction from either end of the vertical travel range. 13. Adjust IR COMP potentiometer to minimize difference between up and down travel time when table is in either no-load or maximum-load conditions. (see Figure 4-9). 14. Reinstall upper and lower table covers (refer to Chapter 2, Assembly and Installation). Receptor Cabinet Removal/Replacement The following procedure is performed with the radiographic portion of the tabletop removed. To remove the radiographic portion of the tabletop, lift up at one corner and pull off tabletop. WARNING! To prevent electrical shock hazards, make sure power is off before proceeding. 1. On systems equipped with a moving grid (bucky), tag and disconnect wires connected to bucky terminal strip. 2. Remove eight (8) 10-32 x 1/2" screws securing Receptor Cabinet to Receptor Cabinet Mounting Bracket and remove cabinet. 3. Place new Receptor Cabinet inside Receptor Cabinet Mounting Brackets and install eight (8) 10-32 x 1/2" screws. Do not tighten screws. 4. Position Receptor Cabinet in brackets so that the distance measured from the top of the Table Frame to the top of the receptor cabinet is 4.25" (see Figure 4-10) at all four corners. When this position is achieved, tighten Receptor Cabinet mounting screws. 5. Install radiographic portion of the tabletop. Slide the Receptor Cabinet from one end of the table to the other and ensure that the movement is smooth. If not, re-check measurements as described in the previous step.

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RECEPTOR CABINET

4.25" TABLE TOP FRAME (UPPER FRONT COVER RESTS ON FRAME)

Figure 4-10. Correct Distance for Receptor Cabinet Installation Cassette Tray Removal Procedure To remove the cassette tray from the housing for cleaning or repair, proceed as follows: 1. Float the tabletop fully back. 2. Pull the cassette tray out by the handle until it stops. 3. Grasp both sides of the tray with your right hand placed near the table and your left hand towards the tray front. 4. Locate the finger hole on the right side of the tray bottom. A spring-loaded plate covers this hole. Press the plate with your right index finger, lift the cassette tray up slightly and pull the tray away from the housing.


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REPLACEMENT PARTS AND ORDERING INFORMATION Table 4-3 provides a list of replaceable parts for the Models QT-740 and QT-750 tables. Figures 4-11 through 4-23 show the locations of the replaceable parts in the system. Use only original replacement parts, as supplied or recommended by Quantum Medical Imaging. Table 4-3. Table Replaceable Parts

Item

Description

Part Number

Model(s) Used On

Qty Used in System

1

Foot Pedal (Up/Down/Float), Table Up/Dn Limit Switches

EL50-006

QT-740 QT-750

2 8

2

4-Way Table Control Board

AY40-017T

QT-740

1

3

6-Way Table Control Board

AY40-030T

QT-750

1

4

AC Transformer

EL55-021

QT-740

1

5

Fuse, 2 Amp (115 VAC Input) Fuse, 1 Amp (230 VAC Input)

EL45-008 EL45-007

QT-740

2

6

Longitudinal Magnet Assembly, Front Side

AY20-062

QT-740 QT-750

1 1

7

Longitudinal Magnet Assembly, Rear Side

AY20-062-1

QT-740 QT-750

1 1

8

Transverse Magnet Assembly

AY20-057

QT-740 QT-750

4 4

9

Transverse Bearing (3/8"ID x 7/8"OD)

ME40-018

QT-740 QT-750

12 12

10

Obstruction Switch, Cross-Roll

EL50-013

QT-750

4

11

Longitudinal Bearing (1/4"ID x 3/4"OD)

ME40-026

QT-740 QT-750

18

12

Bucky Locking Magnet

EL58-004

QT-740 QT-750

1 1

13

Switch, Emergency Shut Off

EL50-009

QT-750

1

14

LED, Emergency Shut Off

EL50-009-1

QT-750

1

15

Lens, Emergency Shut Off

EL50-009-2

QT-750

1

16 (not shown)

Lamp/LED Removal Tool for Emergency Switch

EL50-009-T

QT-750

-

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Item

Description

Part Number

Model(s) Used On

Qty Used in System

17

Switch, Foot Pedal Disable

EL50-014

QT-750

1

18

Bulb, Blue, Foot Pedal Disable

EL50-014-1

QT-740 QT-750

1 1

19

Operator Control Handle Assembly (includes single switch and cable)

AY20-042

QT-740

1

19

Operator Control Handle Assembly (includes dual switches and cable)

AY20-195

QT-750

1

19a

Switch, FLOAT Push Button (part of AY20-042 and AY20-195)

EL50-002

QT-750 QT-740

1

19b

Switch, UP/DOWN Rocker (part of AY20-195)

EL50-043

QT-750

1

20

Receptor Lock Release Lever Handle Grip (Gray)

ME30-012

QT-750 QT-740

1 1

21

AC Transformer

EL55-008

QT-750

1

22

DC Motor Driver Board (Specify Bodine or Minarik type, see Figures 4-8 and 4-9)

EL67-002

QT-750

1

23

Lead Screw Assembly, Rear

AY20-083

QT-750

1

24

Brake, Fail-Safe, Lead Screw

EL80-002

QT-750

2

25

DC Motor

EL66-001

QT-750

1

26

Belt, Drive

ME46-004

QT-750

1

27

Belt, Sync

ME46-005

QT-750

1

28

Brake, Fail-Safe, Motor

EL80-001

QT-750

1

29

Line Filter

EL99-001

QT-750

1

30

Fuse, 6 Amp (115 VAC Input) Fuse, 3 Amp (230 VAC Input)

EL45-006 EL45-009

QT-750

2

31 (not shown)

Bucky Power Cable (35 ft.)

EL75-025

QT-740, QT-750

1


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Item

Description

Part Number

Model(s) Used On

Qty Used in System

32

Switch, Push Button, W/Lens & LED (Auto-Tracking Enable)

EL50-030

QT-750 (w/ QT-AT Option)

1

33

Potentiometer, 5 Kohms, 5-turn (Auto-Tracking Position)

EL20-012

QT-750 (w/ QT-AT Option)

1

34

Shim Tool for Longitudinal Locks

TL10-002

QT-740 QT-750

2

35

Table Top Corner Bumper Set

QT-BMP4

QT-740 QT-750

4

35a

Bumper, Table Top Corner (part of QT-BMP4)

ME30-159

QT-740 QT-750

4

36 (not shown)

Dual Lock Tape (upper)

FA56-001

QT-740 QT-750

6 yds.

37 (not shown)

Dual Lock Tape (lower)

FA56-002

QT-740 QT-750

6 yds.

38 (not shown)

Sound-Proof Mat

ME30-081

QT-750

1

39

Dummy Fuse (shipped separately not installed)

EL45-017

QT-740 QT-750

1

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ORDERING INFORMATION To order replacement parts for the table, contact the Service Department at; Quantum Medical Imaging 2002-B Orville Drive North Ronkonkoma, New York 11779 USA Phone: (631) 567-5800 (x2) Fax: (631) 567-5074 e-mail: [email protected] When ordering replacement parts, supply the following information: Model and serial number of equipment Part number Part description Quantity required P.O. Number Shipping Instructions When ordering components or parts not listed in Table 4-2, a complete description of the part, including its function and location should be provided with the model number and serial number of the unit. Contact [email protected] for more information.

NOTE: Model QT-750 Foot Pedal is shown below; Model QT-740 Foot Pedal has only two switches.

1 Figure 4-11. Replaceable Parts Location Diagram


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2

5 4

Figure 4-12. Replaceable Parts Location Diagram

6,7


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8


9



Revision Q

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10 11


12


Revision Q

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19

20

19a 19b

32 13 17 14 18 15


1

23

3 24 22

21 Figure 4-19. Replaceable Parts Location Diagram


Revision Q

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25

28

26

29

27

30


33


Revision Q

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34

TL10-002

SPACER TOOL, LONGITUDINAL BRAKE Figure 4-22. Replaceable Parts Location Diagram

35



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Revision Q

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Chapter

5

DIAGRAMS

5-1

5-2

Chapter 5 Diagrams

N/O

S1

3

COM 2

1

FLOAT (PEDAL)

S2

3

N/O

COM 2

1

BLACK

RED

FLOAT (PEDAL)

P1 J1 RED BLACK

1 2 3

1 2 3

F1

NOTE 1 COM TB1 WHITE BLACK GREEN/YELLOW

F2

T1

15

2

ORANGE

1

S3

18VAC 4 9

13 19

ORANGE

18VAC 12

1 2 3 4 5 6 7 8

A1

BLACK WHITE

4-WAY TABLE CONTROL BOARD AY40-017T

TB2 115VAC 115VAC RTN BUCKY START BUCKY CONTACT BUCKY CONTACT

BLACK WHITE RED ORANGE GREEN

S4

115VAC RTN EXPOSURE BUCKY CONTACT EXPOSURE BUCKY CONTACT

2 1,3

D1 1N4005

S5 1

RED

-

+

PEDAL DISABLE SWITCH

M2

M3

M4

INPUT

INPUT

JUMPER BETWEEN:

TB1: 5-6, 9-10

TB1: 6-10

1A/250V SLOW BLOW UL LISTED

F2





2

M6

S11 TH SW 1

S10 TH SW 1

2

1

DUMMY FUSE


BROWN

DUMMY FUSE

F1

230 VAC (W/O NEUTRAL)

S9 TH SW 1

230 VAC (W/NEUTRAL)

S8 TH SW

RED

115 VAC (W/NEUTRAL)

230 VAC

S7 TH SW 1

115 VAC

S6 TH SW

BROWN

PERMANENT INSTALLATION (Hard Wired to Mains)

1

CORD CONNECTED (With Plug)

PURPLE

MANUAL FOR ADDITIONAL INSTRUCTIONS).

2

LINE INPUT

TB1 DEPENDS ON AC LINE INPUT. (SEE

M5

2

M1

YELLOW

NOTE 2: ALL FUSES MUST BE U.L. LISTED.

YELLOW

BUCKY GROUND

JUMPER CONFIGURATION OF TERMINAL BLOCK

INSTALL

a b

PED DIS GREEN/YELLOW

QT-740 FUSE USAGE CHART

230 VAC

DS2 4

PEDAL DIS

2

BUCKY SW

BM BUCKY GND

NOTE 1:

115 VAC

BROWN

4

115VAC BUCKY START SIGNAL

2

1,3

2

1 2 3 4 5 6 7 8 9 10 11 12

ORANGE

1 2 3 4 5 6 7 8 9 10 11 12

BLUE

1 2 3 4 5 6 7 8 9 10 11 12

RED

BLACK

GREEN/YELLOW

WHITE BLUE BROWN BLACK

1 2 3 4 5 6 7 8 9 10 11 12

E-Z GLIDE

J1

17

BLACK

SEE NOTE 2

RED

1 2 3 4 5 6 7 8 9 10

1

BLACK

1 2 3 4 5 6 7 8 9 10

N/O 3

SEE NOTE 2 1 2 3 4 5 6 7 8 9 10

BLACK

1 2 3 4 5 6 7 8 9 10

2

WHITE BLACK GREEN

NEUTRAL LINE GND

NOTE 3

RED

IN

ORANGE

115VAC/230VAC

1A/250V SLOW BLOW UL LISTED 1A/250V SLOW BLOW UL LISTED

TM

FOR INTERNATIONAL (230 VAC) LINE, USE LINE CORD EL75-038; CONNECT AS FOLLOWS: BROWN TO LINE LIGHT BLUE TO NEUTRAL GREEN/YELLOW TO PROTECTIVE EARTH

LM

LM

TM

BROWN

FOR 115 VAC LINE, USE LINE CORD AY51-170.

GREEN

ALL OTHER CONFIGURATIONS MUST COMPLY WITH NEC OR LOCAL ELECTRICAL CODES NOTE 3:

TM

TM

SC50-003T REV. K

Figure 5-1. Model QT-740 Radiographic Table Wiring Diagram


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Chapter 5 Diagrams

115VAC/230VAC IN 1 2 3 4

F2

P1

5 4 3 2 1

PURPLE EMERGENCY SWITCH 2 GREEN 1

BROWN ORG GREEN BLACK RED

3

BLACK RED

WHITE/BLACK BROWN/YELLOW

I1 I2

X2 X1

EMERG SW

1 2 3 4 5 6 7 8 9 10 11 12

1 2 3 4 5 6 7 8 9 10 11 12

1 2 3 4 5 6 7 8 9 10 11 12

BROWN

YELLOW

RED/GREEN

ORANGE

YELLOW

BLUE TB2 1 2 3 4 5 6 7 8 9 10 11 12

115VAC BLACK 115VAC 115VAC RTN WHITE 115VAC RTN BUCKY START RED BUCKY START SIGNAL BUCKY CONTACT ORANGE EXPOSURE BUCKY CONTACT BUCKY CONTACT GREEN EXPOSURE BUCKY CONTACT TABLE READY(GND=READY) GREEN PBL CONTACTS (NO) YELLOW PBL CONTACTS (NO) YELLOW TABLE GROUND GREEN/YELLOW BUCKY GROUND

NOTE 3:

MOTOR BRAKE

MOTOR

E Z GLIDE

RED

D3 1N4005

TABLE BRAKE

R1

R2

35 R3

35 R4

35

35

2

YELLOW

3

J2 J1

1 8 4 6 2 9 10 5 3 7

J4

OS4

Down (Top Switch)

S7

BLACK

Up (Bottom Switch)

COM BROWN

1

S6 2

N/0

COM WHITE

1

2

N/0

YELLOW

J3

YELLOW

3

S5

1 11 2 12 3 13 4 14 5 15 6 16 7 17 8 18 9 19 10 20

A1 AY40-030T

1 2 3 4

2

N/0

ORANGE

J6

J5

11 13 12 10 9 1 8 14 15 16 7 6 2 3 4 5

BROWN BLUE

DC MOTOR DRIVER EL67-002 S1 S2 S3

DS1 4

A+

A2

S16

J1

A-

AC AC

S4 BLUE

COM PURPLE

1

OS3 1

1 2 3

3

OS1

OS2

ORANGE

TABLE BRAKE

GRAY

COM

1

3

COM GREEN

1

COM

2

N/C

3

DN LMT

1

S9

COM

2

RED N/C

3

GRAY/WHITE

UP LMT GRAY/WHITE GREEN

S11 N/0

BLUE

1

2 3

FLOAT S12

+24V RTN RTN +24V +24V RTN

N/0

COM

1

2 3

FLOAT

COM

RED BLACK

BROWN

FLOAT

5 4 3 2 1

COM

3

YELLOW D2 1N4005

GREEN/BROWN

BROWN ORG GREEN BLACK RED

SW14

1

DN LMT (RDNT)

8

3

S3

2

N/C

BLACK

SW13

Down (Bottom Switch)

GREEN/BROWN

2

N/0

2

COM

3

UP LMT (RDNT)

ORANGE RED

4-62-4305

ORANGE YELLOW

2

/DN 1

S8 2

S10

4

N/0

COM

1

RED

6 7

2 3

RED

BLACK WHITE

3

BLACK N/C

110VAC

NOTE 1:

1

BLACK

Up (Top Switch)

ORANGE

20VAC

10A, 250VAC

3

S2

PURPLE

GREEN/YELLOW

2

N/0

/UP

GRAY/WHITE

L1 LINE FILTER L2 FL1 GND

SEE NOTE 2:

5

WHITE

1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10

T1

1

WHITE

1 2 3 4

1 2 3 4

BROWN

1 2 BLACK 3 4 5 6 7 8 9 10

1 2 3 4

RED

WHITE

BLACK

GREEN

SEE NOTE 2: TB1

RED

TB3

F1 WHITE

1 2 3 4 5 6 7 8 9 10

1

S1

NOTE 5

NEUTRAL LINE GROUND

6-WAY TABLE CONTROL BOARD

GREEN

2

S14

WHITE BROWN

1

SEE NOTE 4

3 3

+

SYNC BELT

1

S24 2

1

1

N.C.

R1 1K

3

1

R2 5K

BROWN COM

ORN

3

2

1.2K, 2W 5

LED

QT-MAT AUTO TRACK ASSY OPTION

-

N.O.

VIO BLU

GREEN

DRAWER SLIDE SWITCH

AY51-098

(See Collimator

RED

Manual for

BROWN

connection)

BLACK

(See Tracking

RED

Manual for

BROWN

BLACK

-

LM

PINK

WHITE

S20 TH SW

S24 TH SW

S25 TH SW

ORANGE D2 1N4005

connection)

LM

RED

S19 TH SW

3

3

2

1

GRN YEL

RED

2

POT

+

S18 TH SW 1

POT

1

RED

PED DIS

PEDAL DISABLE SWITCH S17 TH SW

2

DRIVE BELT

R1

a b

1

OT

COM BLACK

2

S23 2

3

BLACK

1

1

COM

2

S22 2

3

1

1

N/C

2

S21 2

3

1

BRN

1

Servo Tracking Pot

Collimator Tracking Pot

5K

2

BLK BRN RED SHLD ORN YEL GRN BLU VIO

QT-ACT (OPTION)

POT

2 1 2 3 9 4 5 6 7 8 10 11 12

2

J101

DS2 4

PEDAL DIS

YELLOW

BLK

D1 1N4005

COM

BM2

BLACK

BM1

BUCKY SW

-

N/C

S15 1

2

TM

-

-

TM

TM

-

TM

RED BLACK

BLACK

TAN

GRAY

OPTION QT-DDS (DRAWER SLIDE) SEE NOTE 4

QT-750 FUSE USAGE CHART

SC50-001T REV. V

LINE INPUT CORD CONNECTED (With Plug)

PERMANENT INSTALLATION (Hard Wired to Mains)

115 VAC

115 VAC (W/NEUTRAL)

230 VAC

F1



F2



DUMMY FUSE 6A/250V SLOW BLOW UL LISTED

230 VAC (W/NEUTRAL) DUMMY FUSE 3A/250V SLOW BLOW UL LISTED

230 VAC (W/O NEUTRAL) 3A/250V SLOW BLOW UL LISTED 3A/250V SLOW BLOW UL LISTED

ALL OTHER CONFIGURATIONS MUST COMPLY WITH NEC OR LOCAL ELECTRICAL CODES

NOTE 5: FOR 115 VAC LINE, USE LINE CORD AY51-170. FOR INTERNATIONAL (230 VAC) LINE, USE LINE CORD EL75-038; CONNECT AS FOLLOWS: BROWN TO LINE LIGHT BLUE TO NEUTRAL GREEN/YELLOW TO PROTECTIVE EARTH

Figure 5-2. Model QT-750 Radiographic Table Wiring Diagram


Revision Q

5-4

Chapter 5 Diagrams

2

F1

10A/SB

+ 1

3

4 -

J1 1 2 3 4 5 6 7 8 9 10

18VAC IN 18VAC IN FLOAT PEDAL SWITCH NO

DB1

MB151W

+

C1

R1

27000u/50V

1K/2W

D3

R2 +12VDC

MUR420 OR MURS320T3

1.5K D1

PEDAL DISABLE SWITCH COM +24VDC OUT (LOCKS & LAMP) LOCKS RTN (SWITCHED) +24VDC OUT RTN +24VDC OUT RTN +24VDC OUT (LOCKS & LAMP)

1N759A

R4

R3

R5

D2

10K

10K

100K

1N4148

Q1 IRF530N

C3 2

0.1u Q3 2N2222A

39-29-9106 / 39-29-9102

R10 +12VDC

5

100K

C9

0.1u

4

R8

C6 0.1u R9 10K

Q2 2N2222A

1

TR

Q

RST

VCC

CV

DIS

GND

U1 LMC555CN

THR

R6

3

100

8

R7

7

+12VDC 1.2M

6

C7 0.1u

+

C5 47u/50V

+ C8 22u/16V TANTALUM

10K

SC40-017T REV. E

Figure 5-3. 4-Way Table Control Board A1 (AY40-017T)


Revision Q

5-5

Chapter 5 Diagrams

TP10 EMERGENCY LIGHT SIGNAL (0 VDC TO +9 VDC) TP9 TABLE TOP FLOAT 45 SEC. TIMER SIGNAL (0 VDC WHEN FLOAT FUNCTION IS INACTIVE, ABOVE 7.5 VDC FOR 45 SEC. WHEN FLOAT FUNCTION IS ACTIVE)

SEE TABLE 4-1 FOR INTERPRETATION OF LED INDICATORS

PC40-030T REV F

C20 C3

R17 R19

D49 D35 R47

D14 D41

D34 D29 D23

R80 R3 R76

73 R73 .R

D39 D45 D50 D55

R2

R35

C36 D27 R55 R12

TP13 COMMON (GROUND NOT REFERENCED TO CHASSIS EARTH GROUND)

TP7 MOTOR INHIBIT RELAY K5 (+24 VDC WHEN TABLE TOP IN MOTION, 0 VDC WHEN TABLE TOP AT REST)

D20

D46

TP6 DRIVE DOWN LOGIC VOLTAGE (+15 VDC WHEN ACTIVE = TABLE TOP DOWN MOTION, 0 VDC WHEN INACTIVE = TABLE TOP AT REST)

FUSE

D11 D13

D30

D60 D70 D15

.Q6 R25

F1

8A, 250 VAC FAST-BLO

F2

10A, 250 VAC SLO-BLO

FUNCTION +24 VDC TO TABLE LOCKS 20 VAC INPUT POWER FOR +24 VDC, +15 VDC, +7.5 VDC SUPPLIES

TP5 DRIVE DOWN RELAY K4 (0 VDC WHEN ACTIVE = TABLE TOP DOWN MOTION, +24 VDC WHEN INACTIVE)

C35

POTENTIOMETER A1R78 TABLE UP SPEED ADJUST CW INCREASES SPEED,CCW REDUCES SPEED POTENTIOMETER A1R27 TABLE DOWN SPEED ADJUST CW INCREASES SPEED,CCW REDUCES SPEED

65 65

TP3 DRIVE UP LOGIC VOLTAGE (+15 VDC WHEN ACTIVE = TABLE TOP UP MOTION, 0 VDC WHEN INACTIVE = TABLE TOP AT REST)

R64

R23

D63 R8 R1

R26 R56

R40

TP2 UP/DOWN MOTOR DRIVE DC VOLTAGE

D54 R50

TP1 UP/DOWN MOTOR DRIVE DC VOLTAGE

D28

TP4 DRIVE UP RELAY K2 (0 VDC WHEN ACTIVE = TABLE TOP UP MOTION, +24 VDC WHEN INACTIVE)

RATING

TP8 SAFETY BRAKES RELAY K6 (+24 VDC WHEN ACTIVE = TABLE TOP IN MOTION, 0 VDC WHEN TABLE TOP AT REST)

TP12 +15 VDC (REFERENCED TO COMMON TP13)

TP14 UP/DOWN MOTION 24 SEC. TIMER SIGNAL (+15 VDC WHEN UP/DN FUNCTION IS ACTIVE FOR 24 SEC.)

(APPROX. 160 VDC FROM TP1 TO TP2 WHEN MOTOR IS DRIVING)

TP11 +24 VDC (REFERENCED TO COMMON TP13)

Figure 5-4. 6-Way Table Control Board A1 (AY40-030T) Test Point Diagram


Revision Q

5-6

Chapter 5 Diagrams

.500 [12.7] .250 [6.4]

R FULL 2X

16.50 [419.1] 5.000 [127.0]

1.00 [25.4]

.50 [12.7]

SLOT DIMENSIONS (6 PLACES)

9.38 [238.1] 3.75 [95.3] 5.625 [142.9]

5.00 [127.0]

4.125 [104.7]

4.00 [101.6]

11.000 [279.4]

2.750 [69.9]

18.75 [476.3]

1.375 [34.9]

6.375

3.00 [76.2] DIA

8.250 [209.5]

2.500 [63.5]

15.750 [400.1]

6.000 [152.4]

9.000 [228.6]

33.00 [838.2]

Figure 5-5. Table Base Plate Mounting Hole Locations


Revision Q

5-7

Chapter 5 Diagrams

Figure 5-6. Installing Digital Image Receptor Using QT-FCD Mounting Bracket


Revision Q

5-8

Chapter 5 Diagrams

INSTALLATION INSTRUCTIONS FOR CMT SMARTRAD DIGITAL IMAGE RECEPTOR

INSTALLATION INSTRUCTIONS FOR CMT SMARTRAD DIGITAL IMAGE RECEPTOR

DIGITAL IMAGE RECEPTOR MOUNTING BRACKET

5. Lay digital receptor cable in Cable Clamp and secure by installing top section of Moveable Cable Clamp on lower section. 6-32 x 1/4" BUTTON HEAD PHILIPS SCREWS AND LOCKWASHERS (6X)

6. Re-install top rear table cover while carefully positioning digital receptor cable in cover slot as shown below .

DIGITAL IMAGE RECEPTOR CABLE

SLOT IN COVER

1. Place digital image receptor in Mounting Bracket shown above. 2. Secure receptor to bracket using six (6) 6-32 x 1/4" Button Head Philips Screws and lockwashers. 3. Remove top rear table cover. 4. Remove top section of Moveable Cable Clamp.

7. Align Center Line Indicator Bracket (with label) with center line on image receptor and affix bracket to bottomm surface of image receptor using double-sided tape.

MOVEABLE CABLE CLAMP

CENTER LINE INDICATOR BRACKET

Figure 5-7. Installing CMT SmartRad Digital Image Receptor


Revision Q

5-9

DC30-007 Quantum QT-740 & QT-750 Service Manual Rev Q

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