oec-7600-servicemanual.pdf

COMPACT/SERIES7600™

SERVICE MANUAL

SERVICE MANUAL

BLOCK DIAGRAMS

COMPREHENSIVE PARTS LIST

PERIODIC MAINTENANCE

FIELD SERVICE BULLETINS

© December 1997

COMPACT / SERIES 7600 Imaging System Service Manual

COMPACT / SERIES 7600 SERVICE MANUAL

00-878850-02

©

June 1997

OEC Medical Systems, Inc. 384 Wright Brothers Drive Salt Lake City, UT. 84116-4007


COMPACT / SERIES 7600 SERVICE MANUAL

00-878850-02

©

June 1997

OEC Medical Systems, Inc. 384 Wright Brothers Drive Salt Lake City, UT. 84116-4007


Revision History Rev Rev 1 Rev A Rev B Rev C

Dash -01 -01 -02

Date May 1996 August 1996 July 1997 December Decem ber 1997

Change Description Initial Publication Manufacturing Release Includes Series 7600 Release Relea se to CDROM

COMPACT / SERIES 7600 Imaging System Service Manual - Introduction

Introduction

Purpose: This manual contains service information that will assist trained service personnel to isolate failures and initiate repairs on the 7600 Digital Mobile C-Arm. C-Ar m.

Scope: The information within this manual refers refers to systems currently being manufactured. Howev However, er, there are older 7600 systems in existence and, wherever necessary, this manual includes information and procedures required to service any version 7600. As of this printing the only variations exist in systems with serial number 0142 and earlier. These earlier systems incorporate fixed film iris collimator settings. Systems 0143 and later will not offer this option. Either system facilitates manual collimator operation in all modes. Later systems use this method exclusively exclusi vely..

Target Audience: Individuals that benefit the most from the information provided are those service personnel specifically trained to perform the suggested services. Reading this manual without proper training does not qualify the reader to service the 7600 Digital Mobile C-Arm.


How To Use This Manual Manual:: Sections: The 7600 Digital Mobile C-Arm service manual contains sections. The bookmarks at the left side of the screen are linked to each heading and section and act as a Table of Contents to allow rapid access to the manual.

Warnings, Cautions & Notes: The following warning, caution and note conventions appear throughout the manual to indicate where death, serious injury or equipment damage may be possible. Strict attention to the procedures provided in the warnings and cautions are essential.

WARNING: Warnings indicate the threat of death or serious personal injury.

CAUTION: Cautions indicate the threat of minor personal injury or equipment damage. NOTE: Notes indicate useful information that should be taken into consideration.


Safety Precautions: Trained Service Personnel: Personal injury or property damage can result from incorrectly performed service procedures. Observe all operating and safety procedures contained within this manual.

WARNING: Service personnel specifically trained by OEC Medical Systems, Inc. should perform the procedures to service the 7600 Systems.

CAUTION: Federal law restricts this device to sale by, or on the order of, a physician.

Ingress Of Water And Solutions: Always unplug the AC power cable from the wall outlet before cleaning the equipment. Do not allow water, soap or other liquids to drip into the equipment and possibly cause short circuits, electric shock and fire hazards. Do not operate or store the system where conductive fluids, like water or saline solutions, might spill on the equipment unless you drape or bag the system.


Electrical Shock: Electrical circuits inside the equipment use voltages that are capable of causing serious injury or death from electrical shock. WARNING: This equipment contains high power electrical components and should only be serviced by personnel familiar with the circuits and operation. At certain locations, these voltages are present EVEN WHEN THE POWER CORD IS UNPLUGGED. Areas where dangerous voltages exist: •

Monoblock - 110,000 volts

•

Image Intensifier Assembly - 25,000 - 30,000 volts

•

Line Voltage - 120 VAC

•

Monitor - 15,000 volts

To service the equipment with the covers removed acknowledge the following precautions: WARNING: Observe the two person rule when working near high voltages. One person must remain clear of the machine and be prepared to turn it off in an emergency. Capacitors can retain a charge even when you remove power from the system. Avoid touching these unless you are certain the charge was shorted to ground. High energy capacitors in the system should be shorted through an adequate resistance to avoid potential burn hazards.


Explosion Hazards: WARNING: The system must never be operated in the presence of flammable anesthetics or other flammable or explosive liquids, vapors or gases. Vapors and gases can be ignited by electrical arcs that occur during the normal operation of switches, circuit breakers, push buttons and other circuit components. If flammable substances are present before the system is turned on: 1.

Do not plug the system in

2.

Do not turn the system on.

If flammable substances are detected after the system has been turned ON: 1.

Do not touch of the controls or switches

2.

Do not turn it OFF; do not unplug it

3.

Evacuate all personnel immediately

4.

Ventilate the room to clear the air of the flammable vapor or gas

5.

Remove any volatile liquids that are producing flammable vapors to a safe storage area.


X-Radiation Hazard: WARNING: The X-Ray tube (monoblock) assembly produces X-radiation when energized. Never operate this device without X-ray shielding in place. Use lead shielding and draping to protect personnel.

Motorized Mechanical Motion Hazard: The vertical column is motorized. Observe them continuously while operating this feature to avoid collision with people or equipment. If you remove the covers use extreme care when operating motorized features. Do not wear loose clothing that may become tangled in gears and chains. Do not operate motorized features when fingers and hands are in the vicinity of motorized equipment.


Warning Labels: The following warning labels may be found on the system.

X-RAY SAFETY WARNING:                    

ELECTRICAL SAFETY WARNING:              


Warning Symbols: The following symbols may be found on the system:

DANGEROUS VOLTAGE PRESENT:

D A N G E R

HIGH VOLTAGE PROTECTIVE EARTH GROUND:

The protective earth ground should be the last electrical connection broken and the first electrical connection made during servicing procedures.

COMPACT / SERIES 7600 Imaging System Service Manual - Introduction EMITTING X-RAY SOURCE:

This symbol indicates the presence or potential of producing ionizing X-radiation. Use appropriate precautions.

POTENTIAL EQUALIZATION:

GRN/YEL wire indicates protective earth conductors, accessible parts connected to earth parts, and potential equalization conductors.

COMPACT / SERIES 7600 Imaging System Service Manual - Introduction NON-ANESTHETIC PROOF:





This symbol indicates that equipment in non-anesthetic proof and should not be operated in the presence of flammable vapors, liquids or other substances.

Conversions: • Degrees C = (degrees F - 32)(5/9) • Degrees F = (9/5)(Degrees C) + 32 • 1 inch = 2.54 cm • 1 pound = 0.4536 kilograms • 1 gray = 100 Rads


Unauthorized Modifications: Unauthorized changes or modifications could have hazardous consequences. Do not make changes or modifications unless specifically authorized by OEC. Modification requests are made by obtaining a field modification request form from OEC Medical Systems. NOTE: All OEC 7600 systems comply with International Electrotechnical Commission safety standard IEC601. Do not connect any external device to the system that does not meet the requirements of IEC-601. Only devices provided or approved by OEC Medical Systems, Inc. should be connected to the system. When properly assembled, with a compatible beam limiting device, this diagnostic source assembly fully meets the Federal Performance Standards for Diagnostic X-Ray Systems and Their Components (21CFR 1020.30-32) provided no components or parts are removed from the unit and no unauthorized adjustments are made in the beam limiting device or tube housing assembly. •

Never remove any part of the housing or beam limiting device.

•

Never adjust any part of the beam limiting device unless under direction of the manufacturer.

•

All hardware (i.e. screws, nuts, bolts, etc.) must be re-installed on the equipment.

•

All EMI-RFI shielding components must be re-installed on the equipment. Replace any damaged shielding gaskets to assure that the system complies with EMI-RFI regulations.


Certified Components: The following certified components within the Compact Mobile C-Arm are critical to maintain system performance. Modifications (repair/replacement and some adjustments) of these components require that Form 2579 be completed and filed with OEC Medical Systems, Inc., the FDA, and the state office. •

Beam Limiting Device*

•

Image Intensifier Assembly*

•

X-Ray Monoblock Assembly*

•

* Complete Report of Assembly, FDA Form 2579 whenever the following assemblies are replaced in their entirety, per 21 CFR 1020.30 (d) (1) (2).

COMPACT / SERIES 7600 Imaging System Service Manual - System Overview

System Overview This section will familiarize you with the 7600 Mobile C-Arm.

Applications: The OEC Medical Systems 7600 Mobile Digital Imaging Systems are a multi-application system that provides solutions to the demanding needs of today’s hospital environment. The systems have the capacity to handle many challenging procedures. Hand Surgery Automatically limit’s the x-ray field to the correct size for hand surgery to protect personnel from unnecessary scatter. Chest and Thorox Reduces motion lag in applications such as pacemaker implants & bronchoscopy. Dense Anatomy Improves dense anatomy images such as the pelvis or spine. Reduced Dose Reduces dose to minimize radiation exposure.


Clinical Versatility: ER’s and Cast Rooms Manipulate fractures, locate foreign bodies and guide interventions. CCU’s and ICU’s Guide catheter placements, monitor lysis therapy and perform simple contrast studies. Outpatient Surgery Centers Guide needle placements, identify fractures and guide scope insertions. G.I. Labs Barium studies, colonoscopies and ERCP’s.


Selected Special Features: •

Economical and compact single component design. (Compact)

•

Superb image resolution with low patient dose in pulsed fluoro, pediatric and snap shot modes

•

Technique parameters continually adjust for optimum image display *mA *kVp *Camera Gain *Window/Level

•

Maneuverable and simple one button operation and requires minimal storage space

•

Large view (up to 23cm) and rapid hardcopy thermal printer(optional)

•

9-inch/6-inch or 7-inch/4.5-inch image intensifier

•

Image annotation keyboard

•

High resolution CCD camera

•

12-inch or 17-inch viewing monitor

•

Motorized image rotation

•

Cable pushers.

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation

Theory of Operation Power NOTE: There is a Rev. A and a Rev. B PCB B104 for the Compact. The signal name or component designation has an associated (A) or (B) to distinguish the variations existing between the two PCB’s. If an (A) or (B) does not follow a signal name or component designation no change has occurred. The Series only uses PCB B104 (B). Power On: Compact: When you press on-switch S39 LED 39 illuminates and K1 on PCB B111 energizes. Power relay K1 energizes AC passes to T1. T1 is tapped to provide 90 VAC to both NG1 and NG2 of the power plate assembly. Seventy milliseconds later K2 energizes permitting current to bypass R1. The RC time constant established by R3 and C1 on PCB B79 creats the 70ms delay. In addition, when you press on-switch S39, you generate signal -KON(B). If your system has PCB B104, Rev. B this signal rotates the monitor to the home position when you apply power applied. If your system has PCB B104, Rev. A the monitor does not rotate to the home position at power up. However, monitor rotation to the home position occurs by pressing each monitor rotation switch, S20 and S21, at the same time. This feature is available with either Rev. A or Rev. B of PCB B104. Series: When you press on-switch S51 LED 52 illuminates and K1 on PCB B111 energizes. Power relay K1 in the Carm and power relay K3 in the Workstation energize passing AC to the C-arm T1 and the Workstation T1. T1 on the C-arm is tapped to provide 90 VAC to NG1 of the power plate assembly. Seventy milliseconds later K2 in both the C-arm and Workstation energize permitting current to bypass R1. This 70ms develops through the RC time constant established by R3 and C1 on PCB B79. In addition, when you press on-switch S39, you generate signal -KON(B). If your system has PCB B104, Rev. B this signal rotates the monitor to the home position when power up. If your system has PCB B104, Rev. A the

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation monitor does not rotate to the home position at power up. However, monitor rotation to the home position occurs by pressing each monitor rotation switch, S20 and S21, at the same time. This feature is available with either Rev. A or Rev. B of PCB B104. Power Off: Compact: When you press off-switch S40, K1 de-energizes on PCB B111. This removes power from T1. Series: When you press off-switch S52 on the Workstation or S40 on the C-arm relays K1 on both the Workstation and C-arm de-energize. Power relay K1 on the C-arm and K3 on the workstation then de-energize removing AC power to both the Workstation and C-arm. Emergency Off: Compact / Series: When you press emergency off switch S27, K1 is de-energized on PCB B111. This removes power from the main transformer T1. The emergency off switch is in series with the system off switch.

System Warm-up and Generator Error: Compact / Series: The system requires a 30 second warm-up period before X-ray production. The warm-up sequence visually displays as a blinking warm up indicator on the control panel. The control logic on PCB B100 consisting of PAL U3, timer U14 and inverter U13 provides the signal -WARMLED necessary to illuminate the warm-up indicator. After 30 seconds the signal goes high and extinguishes the warm-up indicator. Once the warm-up is complete X-rays production may occur. If the temperature indicator does not extinguish or illuminates during an exposure an error condition exists. This condition can generally be attributed to: either the monoblock temperature is greater that 158 degrees F or there is no tube current. To determine if you have an “Over Temperature” or a “No Tube Current” condition monitor U2 pins 2 and 3 on PCB B43. If U2 pin 3 is a logic low an “Over Temperature” fault exists. If U2 pin 2 is a logic low a “No Filament Current” fault exists.


Lift Operation: C-Arm Lift: Compact / Series: When you press up-switch S26/S29 you generate signal -KCUP. This signal travels to PCB B100. On this PCB the signal becomes +INCUP and +CUP and eventually leaves the collector of T1 as -CUP. This signal exits PCB B100 and passes through the upper limit switch to the normally closed contacts of relay K5 pin 3 on PCB B105. The -CUP signal energizes the current control relay K1, direction control up relay K2 and current enable up relay K4. These three relay’s, along with the normally closed contacts of the direction control down relay K3, provide a path for the +24VDC out of BR1, located in the power plate assembly, to activate the motor. C-Arm Down: Compact / Series: When you press down-switch S25\S30 you generate signal -KCDOWN. This signal enters PCB B100 where it becomes +INCDOWN and +CDOWN and leaves the collector of T2 as -CDOWN. This signal exits PCB B100 and passes through the lower limit switch to the normally closed contacts of K4 pin 3 on PCB B105. The -CDOWN signal energizes the current control relay K1, direction control down relay K3 and current enable down relay K5. These three relays, along with the normally closed contacts of the direction control up relay K2, provide a path for the +24VDC out of BR1, located in the power plate assembly, to activate the motor. C-Arm No Movement: Compact / Series: The normally closed contacts of the direction control down relay K3 and the normally closed contacts of the direction control up relay K2 place a ground potential on both sides of the lift motor.


Collimator Control: RELAY TRUTH TABLE MODE Table 1

CM K1 K2 K7 K8

Normal

9

23

X

D

E*

D

Mag or Hand

6

15

E

D

E*

E

Mag and Hand

4

10

D

D

E*

E

X

X

D

X

Manual Iris Control

Manual:

INCH

X = Don't Care E = Energized D = De-energized * This relay is on momentarily

Compact / Series: When you press switch S15 you generate the signal -IBZU (manual collimator iris close). This signal travels through PCB B100 to the keyboard interface and control logic on PCB B101. The keyboard interface and iris control logic consist of buffer U5, PAL’s U2, U3, transistor T7 and NAND gate U9. These components receive the keyboard and control panel selection signals and provide the control signals necessary to activate the appropriate relays required to open and close the iris collimator. Signal -IBZU inverts to +RBLMIN. This signal passes through the normally closed contacts of K7 and energizes relay K6. The output of K6 is a pulsed signal called -MIBZ. This signal passes through PCB B100 and the filter board to PCB B45 where it activates the drive circuit relay K6. The activation of K6 applies +16VDC to the iris motor. De-energized relay K5 on PCB B45 provides the return path to ground. When you press switch S18 you generate the signal -IBAUF (manual collimator iris open). This signal passes through PCB B100 to the keyboard interface and control logic on PCB B101. It exits the control logic as +RBLPLU and inverts at U1 on PCB B101 to activate the iris open relay K5. From relay K5 the pulsed signal -MIBA passes through PCB B100 and the filter board to the drive circuit relay K5 on PCB B45. This applies +16VDC to the iris motor. De-energized relay K6 on PCB B45 provides the return path.

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation Mag: Compact / Series: When you press switch S19, LED 19 illuminates and you generate the signal -KMAG. This signal enters PCB B100 where it inverts and renamed as +MAG. The +MAG signal travels to the keyboard interface and control logic on PCB B101. The keyboard interface and control logic, consisting of buffer U5, PAL’s U2, U3, transistor T7 and NAND gate U9, activates the appropriate relays necessary to establish the desired iris positioning signal (refer to relay truth table 1). The actual iris position signal (POTIM) comes from the iris potentiometer located on the collimator assembly. These signals feed the iris comparator circuit that consists of voltage divider network R52 and R2 and iris close comparator U6 and iris open comparator U7. The difference between the desired iris position (applied to R52) and actual iris position (applied to R2) causes the iris comparators to either activate iris close relay K6 or iris open relay K5. The corresponding drive signal, either pulsed open (-MIBA) or pulsed closed (-MIBZ), passes through PCB B100 and the filter board to the drive circuit on PCB B45 that controls iris motor direction. Once the actual and desired iris positions match, a ground potential exists on both sides of the iris collimator motor. Film: Compact / Series: When you press switch S4, LED 4 illuminates, and you generate the signal -KDA. This signal enters the keyboard interface and control logic on PCB B100. It exits this PCB as -DA* and enters the keyboard interface and control logic on PCB B101 that places the system in the film mode. The keyboard interface and control logic on PCB B101 will initiate iris collimator movement if you press switch S3. (This switch is only available on system SN 142 and earlier). When you press switch S3, LED 3 illuminates, and you generate the signal -BL24. This signal travels to the keyboard interface and control logic on PCB B100 and from there to the keyboard interface and control logic on PCB B101. On PCB B101 the appropriate relays are activated to move the iris collimator to the desired 24cm (9. 4”) position once the hand switch is pressed to make the film exposure. When the film exposure concludes the iris collimator moves back to its previous position.


If you select the film mode and no new iris collimator position the collimator will maintain its current position and will change with the manual iris collimator switches on the control panel. The difference between the desired iris position (applied to R52) and actual iris position (applied to R2) causes the iris comparators to either activate iris close relay K6 or iris open relay K5. The corresponding drive signal, either pulsed open (-MIBA) or pulsed closed (-MIBZ), passes through PCB B100 and the filter board to the drive circuit on PCB B45 that controls iris motor direction. Once the actual and desired iris positions match, a ground potential exists on both sides of the iris collimator motor.

Shutter And Rotation Motor Drive Control: Compact / Series: Switch’s S13 and S16 control shutter operation. When you press switch S13 you generate the shutter close signal -SBZU. The SBZU signal travels through PCB B100 and the Filter Board and activates K2 of the drive circuit on PCB B45. The activation of K2 applies +16VDC to the shutter motor. Relay K1 on PCB B45 provides the return path to ground. When you press switch S16 you generate the shutter open signal -SBAUF. The SBAUF signal travels through PCB B100 and the Filter Board and activates K1 of the drive circuit on PCB B45. The activation of K1 applies +16VDC to the shutter motor in the reverse direction. Relay K2 provides the return path to ground. Switch’s S14 and S17 control shutter rotation. When you press switch S14 you generate the rotate counterclockwise signal -SBCCW. The SBCCW signal travels through PCB B100 and the Filter Board and activates K3 of the drive circuit on PCB B45. The activation of K3 applies +16VDC to the shutter rotation motor. Relay K4 provides the return path to ground. When you press switch S17 you generate the rotate clockwise signal -SBCW. This signal travels through PCB B100 and the Filter Board and to K4 of the drive circuit on PCB B45. The activation of K4 applies +16VDC to the rotation motor. Relay K3 provides the return path to ground. Shutter close, shutter open, rotations counterclockwise and clockwise terminates upon limit switch activation.

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation If all other circuits are operating properly X-ray production begins. If an “Over Temperature” or a “No Tube Current” condition occurs and the error signal -GERR develops. This signal exits the monoblock and travels to the control logic on PCB B100 where X-ray production terminates. Refer to system warm-up and generator error theory and the temperature sense theory, both in this section. The -SPT signal enters Opto-Isolator U3 (A), U6 (B) and leaves PCB B104 in route to the image processor as the signal -TRIGIN. This signal represents the frame store enable request sent to the BMS-500 (Compact) and BMS-100 (Series) at parallel port S4. The BMS-500 (Compact) and BMS-100 (Series), in response, generates and transmits from parallel port S4 the signal -TRIGOUT. This signal represents the frame store ready condition. The -TRIGOUT signal travels to PCB B104 where it enters Opto-Isolator U3 (A), U7 (B). This signal exits U3 (A) or U7 (B) as -SPR and enters the control logic PAL U1 pin 44. The -SPR signal enters the control logic PAL U1 pin 44 and maintains the active signal -STRA until the image processor has sufficient time for last image hold. The -SPR signal stays active for 640 msec after you release the X-ray switch. Once the last image hold operation completes the —SPR signal goes high that causes the -STRA signal to go high and X-rays terminate.

Film Mode Control Logic: Compact / Series: The film shot initiates by operating the handswitch. Before a film shot generates you must activate the film mode switch S4 to create signal -KDA. The activation of this switch also illuminates LED 4. In addition, manual selection of the kV occurs by operating the kV increase switch S11 creating the signal -KVPLUS or operating kV decrease switch S12 creating the signal -KVMINUS. The kV default value displayed when you select the film mode may also be used. At the same time a manually selected exposure time must be entered. This occurs by operating the time increase switch S5 that creates the signal -SECPLUS or time decrease switch S6 that creates the signal -SECMINUS. Both of the manually selected time signals pass through PCB B100 before entering the film expo-


sure timer control logic on PCB B102. The film exposure timer control logic on PCB B102 generates the signals necessary to illuminate the film exposure time display located on the control panel. The four timer signals include: QA, QB, QC, QD. These signals pass through PCB B101 before entering the control panel. The manually selected kV theory appears in the kV generation and regulation section. The combinations of handswitch signal -HANDSH and film mode signal -KDA at the control logic, consisting of PAL U2 and buffer U12, on PCB B100 starts the film mode process. From the control logic the signal +DAREQ (film exposure request) generates. This signal travels to the one second preparation timer and the control logic consisting of PAL U3, inverter’s U11 and U23 and relay K1. The preparation timer generates signal +MOVORB that travels to the same control logic as the +DAREQ signal. This control logic generates the three signals necessary for X-ray production in the film mode. They include: -DA, -XRAY and -ENCNT63. Signal -DA is active one second before the exposure and illuminates LED D36 on PCB B100 and continues to the Filter Board and monoblock. The -DA signal also travels to the filament mA select logic to place the system in the 20mA mode. Signal -XRAY illuminates LED D43 on PCB B100 and continues to the Filter Board and monoblock. In addition, the -XRAY signal travels to the control panel to illuminate X-ray indicator, LF1 and to PCB B64 to enable the kV control logic and PCB B143 to enable the mA control logic. Finally, it goes to the film exposure timer control logic on PCB B102. At this time X-ray production begins. If all other circuits are operating properly, X-ray production begins. If an “Over Temperature” or “No Filament Current” condition develops the error signal -GERR generates. This sign al exits the monoblock and travels to the control logic on PCB B100 and X-ray production terminates. Refer to system warm-up and generator error theory and the temperature sense theory, both in this section. The -ENCNT63 signal is the count signal generated by the control logic located on PCB B100. This signal travels to the film exposure time and control logic on PCB B102. The film exposure time and control logic will monitor the -ENCNT63 signal and compare it to the control panel selected exposure time. When the two internal registers detect an “equal” condition the film exposure time and control logic generates and transmits the +ENDA signal to the control logic on PCB B100 necessary to terminate X-ray production.


Kv Generation & Regulation: Compact / Series: Manual: When you press the KV Manual switch S10 LED 10 illuminates and you generate the signal -KKVMAN. This signal feeds the keyboard interface and control logic on PCB B100 and from there it enters PCB B64 at relays D6 and D7. It also enters the KV Control Logic on PCB B64 where it combines with the -KVPLUS, (KV increase) and the -KVMINUS, (KV decrease), produced during manual kV selection, and the -XRAY signal necessary for any exposure. The -KVPLUS, -KVMINUS and -XRAY enter PCB B64 from PCB B100. The KV Control Logic feeds the kV Display Control on PCB B64 where a 4 bit kV display code generates and feeds back to the control panel to display the selected kV. The -KKVMAN signal energizes D6 that sends the video level signal from the camera to ground. The -KKVMAN signal also energizes relay D7 to select manual kV control. The output of PCB B64 is KVSOLL. The KVSOLL signal is a dc voltage corresponding to the KV selected. Refer to table 2 for additional information. 

 

 







 

   

Table 2 KVSOLL travels from PCB B64 to PCB B100 where it goes through variable resister R28, required for the kV calibration, and comparator IC7. The output from this comparator is KVSOLL*. This signal travels from PCB B100 and passes through the Filter Board and PCB B45 and into PCB B54. From PCB B54 the signal enters PCB B43 as H. V. PWM Drive. On this PCB additional kV regulation occurs and the signal combines with the Drive Pulses at IC13. The 4 outputs from IC13 travel to Power Driver PCB B42 and its intermediate drive circuit.

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation The modulated pulse signal outputs travel from PCB B42 to feed Power PCB B40. These modulated pulses turn on the FETs in pairs: Groups I and IV or Groups II and III. The current flow in transformers Tr3 to Tr8 generates an induction voltage that transforms up, rectified and cascaded to a maximum of +/- 55kV on the anode/ cathode. The power developed by the primary transformer T1 and governed by the control logic of PCB B100 and the VAC select relays on PCB B79. These relays pass either 90VAC, 120VAC and 195VAC depending upon the mode selected and the monoblock temperature. The signals that determine the relay activity are the temperature sense signal, -QMA05 and the -SWITRAF signal. The VAC outputs from PCB B79 rectify to DC and then pass through the Filter Board and provide power to the FET’s on PCB B40. Refer to table 3 for additional information. MODE

POWER

K4

K5

Fluoro Temp. >144 Degrees F

90VAC

X

D

Standard Fluoro - Chest and Hand (Hip <56kV)

120VAC

D

E

Film Mode - Snapshot and Hip >56kV

195VAC

E

E

Table 3 Table 4 illustrates the voltages present at the FET’s on PCB B40. These voltages represent the rectified AC voltage multiplied by 1. 414. MODE 0. 5 mA Fluoro (Temp>62 C)

APPROX. VOLTAGE 125vdc

Standard Fluoro, Chest, Hand, Hip <56kV

165vdc

Snapshot

265vdc

Hip >56kV

265vdc

Film

265vdc

Table 4

COMMENT

Must Prep.

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation From the tank the -kV Sense and +kVSense signals generate and feed back to PCB B54 at IC2 and compared with the KVSOLL* signal for additional tuning of the actual and selected KVP . Auto: Compact / Series: When you press the auto fluoro mode switch S7 you generate the signal -KFLUORO. In addition, the auto fluoro mode relays D6 and D7 on the B64 PCB remain de-energized. This removes the ground path of video level signal, DLIST, from the camera PCB AU-01 and allows it to feed through OP AMP IC25 and become KVSOLL. Refer to the KVSOLL control table 2. Once the KVSOLL signal occurs the kV Generation & Regulation operates the same in the auto mode as it does in the manual mode .

Ma Generation & Regulation: Compact / Series:        



         



      

             

  

 

                         







Figure 1

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation MA Generation & Regulation is kV controlled. From figure 1 above it demonstrates that in certain modes and kV ranges the mA output does not change. In addition, when mA varies, kV drives the mA output. The mA control process begins with the KVSOLL signal generated on PCB B64. The KVSOLL signal travels to PCB B143 where it combines with either the fluoro or film mode selection made at the control panel. At the same time the Filament mA Select Logic on PCB B143 activates the appropriate IC switches necessary to match the mA output with any X-ray mode selected. A time interval of 1 second between exposures in fluoroscopy occurs to allow the filament current to decrease. All fluoro and film modes operate in the same manner as described below in the snapshot mode except for the switch, LED and signal designations. Therefore, understanding snapshot will allow you to follow any selected fluoro or film mode. Snapshot/Oneshot:

Compact / Series: When you press switch S9, LED 9 illuminates and you generate the signal -KSIPU. This signal enters the keyboard interface control logic on PCB B100. The signals out of this board are -SIPU* and -XRAY. These two signals travel to the filament mA select logic on PCB B143. The filament mA select logic then activates the appropriate IC switches in U10, U9 and U8 to produce an 8mA output. U10, U9 and U8 are digitally selected analog CMOS (Complementary Metal Oxide Semiconductor) switches. Once this concludes, the filament voltage regulation and overvoltage logic section of PCB B143 produce the UH Filament Voltage. This is an analog representation of the mA. From PCB B143, the UH Filament Voltage passes through the filter board and to the filament current detect circuit on PCB B40. The filament pre-drive logic on PCB B43 feeds the filament drive transistors on PCB B40. These drive transistors combine with the UH Filament Voltage on PCB B40 to drive either filament. From the monoblock, which is a combination of the tank and tube, the mA Sense line passes through PCB B40 and to the mA detect logic on PCB B43. On this PCB the mA Sense line becomes MAIST. The MAIST signal exits PCB B43 and passes through PCB B45 and the filter board to PCB B100. On PCB B100 the signal takes two paths. One path feeds the mA display control circuit on PCB B100 where it then feeds the control panel mA

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation display after passing through PCB B64. The second path feeds the MAIST signal out of PCB B100 where it travels to comparator U12 pin 5 on PCB B143. The output of comparator U12 pin 7 sums with the mA control line. The output of comparator U12 pin 1 is the corrective voltage. This voltage travels to the filament voltage regulation and overvoltage logic on PCB B143. The output from this logic is the UH Filament Voltage that applies to the filament to increase or decrease mA output.

Temperature Sense: Compact / Series: When the internal monoblock temperature sense thermistor detects a temperature of greater than 144 degrees F, the mA output limits to 0. 5 mA. The temperature sense line feeds from the monoblock to PCB B45. It exits PCB B45 and passes through the Filter Board and exits this board as signal -QMA05. From the Filter Board the signal travels to PCB B100. From this PCB the signal takes two paths. One path is to the Filament mA Select Logic on PCB B143. The Filament mA Select Logic then activates the appropriate switches necessary to limit the mA generation to 0. 5 mA. The other path is to PCB B79 where it limits the high voltage power to 90VAC.

Image Intensifier: Compact: The -KMAG signal created by pressing switch S19 enters PCB B100 where it inverts and renamed to +INMAG and +MAG and exits PCB B100 as -MAG*. The -MAG* signal travels to PCB B212 where it splits to feed the camera power supply PO2 and the I. I. power supply PCB B34. The PO2 power supply receives 24VDC from power supply, NG-1. This 24VDC passes through PCB B212 before entering the PO2 power supply. In addition, the PO2 power supply transmits the signal HSYNC to PCB B34 commonly referred to as the I. I. power supply. The PO2 power supply also transmits 18VDC through PCB B212 to the I. I. power supply. The combination of the -MAG*, HSYNC and +18v places the image intensifier in the magnification mode.

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation Series: The series system has the Hand and Mag image intensifier modes. You select the Mag mode or II MAG1 mode by pressing switch S19. To enter the Hand mode or II MAG2 mode you must select both the Hand, switch S34 and Mag, switch S19. The -KHAND signal generated when you press switch S38 enters PCB B100. On this PCB the name becomes +IOHAND, +HANDMAG and exits as -HANDMAG. The signal -HANDMAG passes through PCB B212 and into PCB B34. PCB B34 is the image intensifier power supply. The -KMAG signal generated when you press switch S19 enters PCB B100. On PCB B100 the -KMAD signal inverts and becomes +INMAG. The +INMAG becomes +MAG1. The +KMAG signal becomes -MAG* and exits PCB B100. The -MAG* signal travels to PCB B212. On PCB B212 the -MAG* signal splits and feeds PCB B34 or II power supply. And feeds LST1 on the camera. When you press S38 you generate the signal -GAMMA. The-GAMMA signal passes through PCB B100 and PCB B212. From PCB B212 the -GAMMA signal enters the VD01 PCB of the camera head assembly. The camera power supply, PO2 , receives +24v from NG1. The camera power supply feeds and passes +18v through PCB B212 and onto the image intensifier power supply, PCB B34.

II MAG1 MODE

II MAG2 MODE

-MAG* = -KMAG & -KHAND

-HANDMAG = -KMAG & -KHAND

-MAG* = -KMAG & -KHAND Table 5


BMS-500 Digital Image Sub-System (Compact):

      

      

       

      



General Description: The BMS-500 digital image storage system operates in a wide variety of applications due to its modular structure and its high processing capabilities. Starting from the minimum system with a CPU card and an image input and processing unit for the integration of up to 256 images, the system expands with a 100/120 Hz refresh frequency. A RAM disk with a capacity of 3 standard images provides short-term storage. The system makes the following functions available:

  

  

• Display and storage of the video signal • • • • •





  

 

Noise reduction by image integration Auto-windowing Storage of images on a RAM disk Image reversal Hz output (optional)



   

Figure 2

 

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation Functional Description: The BMS-500 offers multiple image recording functions. The individual functions occur via the parallel port S4. All the inputs and outputs of the parallel port are Low Active, that is, if there is a zero level at the input of the parallel port, the input activates and the corresponding function commences. After you turn on the unit, the initialization completes and the readiness of image recording functions displays by the presence of a test image on the monitor. During the initialization, a self-test performs and the message “WAIT” appears in the status line that indicates that no functions occur for the duration of the self-test. An additional output that can appear in the status line independent of the functions is the message “OUTSYNC. ” This message indicates that the image memory is being synchronized with the connected video source. No image recall occurs during this time, but all other functions will execute. The components of the BMS-500 Frame Store Assembly are: The BSA-500 Subassembly is the central image recording and processing unit. It comes with the BNC jack sockets for the video input (VIN) and the video output (VOUT). It also contains the digitization unit, and the overlay and control logic. BMS-500C. The BSA-500C subassembly contains the image memory. NWA-500. The NWA-500 subassembly receives images from the BSA-500 subassembly and outputs these images to either the hard copy printer and/or monitor. The NWA-500 subassembly has a total of 4 video outputs (V1 - V4). V1 supplies a 50/60Hz image and V2 - V4 each supplies a 100/120 Hz image signal. V1 feeds the hard copy printer and V4 feeds the video monitor. The CPU-100 subassembly is the central processing unit. It contains a Reset Switch and three LED’s. The three LED’s are SV, L2 and L3. The Reset Switch will restart the software. The SV LED, also referred to as the supervisor LED, display’s processor operation. L2 indicates whether the image memory runs in synchronization with the video signal at the input of the image memory. If not, the LED turns off for the duration of the synchronization that then initiates. You can not acquire images during synchronization. Subsequently, L2 and L3 can

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation also indicate error conditions that may occur during the self test. The self test performs automatically each time the system starts or restarts. The BMS-500 Frame Store Assembly requires +/-12VDC and +5VDC received from Power Supply NG2.       

               

    

 



       

         

   Figure 3

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation The image recording divides into two phases: continuous display and storage (LIVE Phase), and the end of the continuous storage of the video signal. (STO Phase) Different methods to reduce noises are available for the two phases: For the LIVE Phase, the user can select between direct display (no filtering) and recursive filtering (AVR). In recursive filtering, an average corresponding to the selected filter stage occurs between the past image and the current image. The weighting ratio is as follows: • • • •

Filter Stage 1 at a ratio of 50% to 50% Filter Stage 2 at a ratio of 60% to 40% Filter Stage 3 at a ratio of 75% to 25% Minimum time: 80 ms

For the STO Phase, between storing the current image and integration, the user can select from 2 to 256 images (in steps of powers of two). Time = No. of images * 40 ms. The method for noise suppression comes from the SETUP menu. It activates with the Signal . The image recording phases display on the status line located at the lower edge of the picture. Messages include “LIVE” and “STORE. ” The instantaneous image content of the monitor stores on the RAM disk during the LIVE Phase with the signal at the parallel port. Only one image stores with each signal. Select automatic storage from the SETUP menu. In the active stage (response “MAUTO” at the parallel port), the current image stores on the RAM disk after each image recording (after the STO phase). Image Recording: To control the image recording, there is a recording input at the parallel interface to activate and end the recording process. As long as the signal is LOW active, the system is in the LIVE mode. It then automatically switches to the STO mode. With image recording units in which there is a delay between the start of recording and the transmission of the

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation first image, a delay time for the image recording after the activation of the recording input can be set in the SETUP menu. The image storage system then waits to input the image until this amount of time has passed before storing the first image. During this period of delay, the message “WAIT” appears on the lower edge of the monitor screen. Image recording units activate only briefly to record images controlled by the BMS-500 via the recording output. Auto-Window: The BMS-500 image storage system is capable of expanding a limited gray range over the full contrast range of 0 to 255 (8-bit). The contrast spread does not change the content of the image, only the display. The minimum and maximum gray-scale values develop from the average trimmed picture. These values calculate the optimal contrast and brightness of the image for the contrast spread. The calculation and setting of the contrast spread occur automatically during the LIVE phase, either cyclically or by being called up (Auto-window) with the final image (STO). This function activates and deactivates via the signal on the parallel port. The time at which the calculation activates occurs in the SETUP menu. With the Auto-window function inactive, the entire contrast range from 0 to 255 always displays. If the Auto-window function is active while in the LIVE phase, the contrast values continuously updated during the LIVE Phase and retained for the STO Phase. On the other hand in Auto-window during STO, the contrast values over the entire range reset at the beginning of the LIVE Phase, and are recalculated only in the STO phase. When you turn on the unit, the Auto-window function activates automatically. Ram Disk Functions: In the BMS-500 image storage system, the images displayed on the monitor store on a standard installed RAM disk, and can be read from the same disk. Three images store on a RAM disk. Store Images : With the signal , the current image from the monitor stores on the RAM Disk. Only one image stores per signal. After storing, the image number automatically increases. Once the maximum number of images store, the next image is Number 1. Older images disappear. In addition, the image content and contrast range are also stored on the RAM disk. Stored images decimate once you remove power from the system.


Search Forward And Backward : The RAM disk searches forward with the signal > and backwards with the signal . The image number automatically increases or decreases by one before reading. The user can thereby select between the display of an individual image or a continuous display of the images. The RAM disk is in the Individual Image Mode when one of the two signals activates briefly. Each signal increases or decreases the Image Number by 1. If one of the signals activates for longer than 100 ms, the RAM disk automatically switches to continuous display. As long as the respective signal remains active, images display from the RAM disk on the monitor in ascending or descending sequence. For identification purposes, the current image number displays on the monitor. The length of time between the display of the individual images determined by selecting the Search Delay in the SETUP menu, in intervals from 40 ms to 10 s. After the signal terminates, the image most recently selected displays with the corresponding contrast data. The RAM disk searches cyclically. When the highest image number occurs, the search continues with Image No. 1, and vice-versa. Automatic Storage: By way of the “Automatic Storage” menu item in the SETUP menu, the user can select whether or not the current image stores automatically on the RAM disk after the STO Phase. When “Automatic Storage” turns on, the message “ON” appears in the SETUP menu after the menu item and the acknowledgment “MAPUTO” at the parallel port after leaving the SETUP menu. Image Reversal: At the 100/120 Hz output of the NWT-500 subassembly, the image displays reversed left to right. The reversal commences by a signal at the Image Reversal input of the parallel port and displays at the corresponding output. The reversed image not available at the 50/60 Hz outputs of the system.


BMS-500 Service Information: Each time the BMS-500 starts or restarts, it performs a self-test that takes approximately 7 seconds. If an error occurs during this test, it appears via the LEDs on the CPU-100 card or on the monitor. Error: After starting, no test image appears, and the SV LED on the CPU-100 does not light. Cause: Defect in the CPU-100. Error: No test image appears after starting, and the L3 LED on the CPU-100 flashes. Cause: Defect in the CPU-100. The number of flashes of the L3 LED indicates the error: • 1 flash - Error in program memory (EPROM/PROM) • 2 flashes- Error in data memory (RAM) • 3 flashes- Error in clock module

Error: No test image appears after starting, and the L2 LED on the CPU-100 flashes. Cause: Defect in the image memory cards BSA-500 or BSA-500C. The number of flashes of the L2 LED indicates the error: • • • • • • •

1 Flash- A-card defective or missing 2 Flashes- B-card defective or missing 3 Flashes- Memory error (RAM) on the BSA-500 card 4 Flashes- Memory error (RAM) on the BSA-5OOC card 5 Flashes- IC error on BSA-500 card 6 Flashes- Controller error on the BSA-500 card 7 Flashes- Other error on BSA-500 unit

Additional errors display at the lower left edge of the screen. Such as Data loss that would indicate the EEPROM or the battery-buffered RAM in the CPU-100 is defective. Also, NWA-card defective would indicate the NWA-500 card is defective.

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation Also, the video signal routes directly from the camera to the monitor, commonly referred to as, Video Bypass. This occurs when you: 1. 2. 3. 4.

Disconnect the BSA-500 VIN connector Disconnect the NWA-500 V4 connector Connect these two cables using a barrel connector Set the monitor for 15khz operation using the switches on the rear panel (12-inch monitor). 5. Set the monitor for 16khz operation using the switches on the rear panel (17-inch monitor). Setup: 1. To access the frame store setup menu press and hold the power on button as you press the image save button. 2. To scroll through the setup selections press the image recall button. 3. To select a setup option press the image save button. 4. To change data within an option press the image recall button. Changed data saves when you quit setup. 5. To quit setup scroll to the quit setup selection and press image save.

                                   


Jumper Settings: 

  

































 

 







  





 





              







 





  

       









Figure 4

  

 


BMS-100 (Series): BMS-100 Setup: The SETUP menu displays on the right monitor by pressing the shift and home keys on the workstation control panel. Selections are made by operating the manual up and down arrows and return key. -BMS-100 SETUP QUIT SETUP CHANGE TEXT CHANGE LANGUAGE SUBTRACTION VALUES CLEAR IMAGES AUTO TRANSFER SET TIME/DATE AUTO WINDOW DATE FORMAT

YES/NO YES/NO HH:MM:SS LIVE/STORE DD-MM-YY MM-DD-YY

NO NO LIVE

SERVICE MENU _____________________________________________ CHANGE TEXT: The following items selected in the “CHANGE TEXT” menu: - CHANGE TEXT QUIT SETUP CHANGE HEADLINE (hosp name) CHANGE RECORDED CLOCK CHANGE SYSTEM LOGO

TEXT TEXT 7600 S 7600 ES 7600 ESV

to 2 PICTURE to 400 PICTURE to DSA

CHANGE FIRM LOGO _______________________________________________________


Change Headline: Under this menu item the headline can be entered or changed. Change Recorded Clock: Under this menu item the stored time and date of an image can changed. Change System Logo: Under this menu item the name of the system (max. 8 characters) which appears in the center of the test image (ex works “BMS-100”) can be changed. A change is only visible after a reset of the equipment. Valid characters are capital letters and the numbers 0 to 9. Change Firm Logo: When you choose this option the logo of the manufacturer (max. 8 characters), displays in the test image (ex works “VDS”) can be changed. The change is only visible after a reset of the equipment. For the company logo all capital letters as well, the small letters ‘vds’ as well as the numbers 0 to 9 may be selected. CHANGE LANGUAGE: - CHANGE LANGUAGE ENGLISH / ENGL-FRANC / DEUTSCH

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation SUBTRACTION VALUES: (Factory Set - no adjustment necessary) NOTE: Not available with United States Systems. - SUBTRACTION VALUES QUIT MENU DSA: MASK 1 - 256 8 DSA: LEVEL 0 - 255 128 DSA: CONTRAST 1 - 255 64 MINOP: MASK 1 - 256 8 MINOP: TIME INTERVAL 0 - 34460ms 0ms MINOP: RELATIVE VALUE 0 - 255 128 MINOP CONTRAST GAIN 0,01 - 9,99 1,50 MAXOP: MASK 1 - 256 8 MAXOP: TIME INTERVAL 0 - 34460MS 0MS MAXOP: RELATIVE VALUE 0 - 255 128 MAXOP: CONTRAST GAIN 0,01 - 9,99 1,0 _______________________________________________________ DSA Values: In this menu the DSA contrast values can be set. For the mask recording the number of images through which integration is carried out can be entered. MINOP and MAXOP Values: For MINOP and MAXOP the integration number of images for the mask, the interval time, the relative value and the enhancement have to be adjusted independently from each other. These functions operate with a linear contrast enhancement defined by a contrast amplification. For optimum use of the 256 gray levels, the user can select a reference value for the subtraction results on which the result 0 displays (same content of mask and live image). The interval time makes it possible to select a timing control. If the time is 0, the subtraction performs.


CLEAR IMAGES: Removes stored images from the harddisk. AUTO TRANSFER: Two images are stored automatically and when the third image saves the first one erases. SET TIME/DATE: Allows for time and date changes and assists in image archival. AUTO WINDOW: Auto window will either be applied to the live image of the last image displayed. SERVICE MENU:(PASSWORD - BMS 95) QUIT MENU CLEAR HARDDISK BY STARTUP HARDDISK-TEXTSTORE ALWAYS DOCUMENTATION VALUES DOCUMENTION TIME GAMMA CORRECTION FRAME OFFSET LIVE FROM KEYBOARD (FACTORY ONLY) IMAGE PROCESSING VALUE Factory Setup LIVE - DELAY STORING MOMENT CHANGE CODE SOURCE ADJUST FILTER FACTOR ADJUST INT NUMBER VIDEO MODE KEYBOARD LAYOUT FORMAT HARDDISK CLEAR ALL IMAGES

YES/NO YES/NO QUIT MENU delay 400-9980 ON/OFF VALUE -9 - +9 QUIT MENU 0-9980 WHOLE IMAGE/LINE EXT not used not used 60 HZ EIA/50HZ CCIR BMS/IMS YES/NO YES/NO

_______________________________________________________

NO NO 2000ms OFF 0

200ms WI

OPTIONAL BMS OPTIONAL OPTIONAL


Hardware: The image processing system BMS-100 is integrated into a 19-inch housing.

Figure 5 - BMS-100 system This housing contains the VMEbus boards, the power supply unit, one or more hard disks and the interfaces. The following chapters describe these components. CPU-100 Board: The CPU-100 board is the central processing unit of the BMS-100 system. It contains the Motorola CPU 68000, the RAM and EPROM and various interfaces, among these are two serial, one parallel and one SCSI interface. The front panel comes equipped with the reset button and 3 LED’s (SV, L3, L2). The reset button is used for a new start of the software.

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation LED “SV” is on, if the processor is in the “supervisor mode”. As all programs are usually carried out in this mode, this LED indicates that the processor is in operation. LED “L2” indicates whether the frame store synchronizes with the video signal on the input of the frame store. If this is not the case, the LED turns off during the synchronization. During this time it is not possible to record images. With each turn-on or reset of the system a self test carries out automatically. If an error occurs, the LED’s “L2” and “L3” indicates the cause of the errors.

Reset Button

Supervisor LED SV

L3 Sync LED L2 Figure 6 CPU-100


BSA-500 Board: The image recording and processing unit of the BMS-100 consist of two VMEbus cards, BSA-500 and BSA-500C. The BSA-500 board contains the digitizing part, the overlay and the control logic, whereas the BSA-500C board contains the frame store.

 

 

 

Figure 7 BSA-500



   



  

The BSA-500 card comes equipped with one BNC connector, respectively, for the video input (VIN) and video output (OUT). The sync. connector SYN is available with H and V sync signals and the sync mix for the synchronization of a video camera.

 

   

 



  



COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation 

NWA-500 Board: With the NWA-500 board video images can be outputted with an image repeat rate of 100/120 Hz. Images created by the board BSA-500 are used for the display. The board NWA-500 has 4 video outputs (V1 to V4), of which output V4 provides a 100 / 120 Hz image signal and output V1 provides a 50 / 60 Hz signal. The sync output of the board provides the horizontal (H) and vertical (V) sync. signal for the 100/120Hz field frequency, only.



   

  

The connections V2 and V3 can be switched between 50/60Hz and 100/120Hz by means of jumper J5.



  

Contrast display: The V1 to V4 connectors configure with the following output functions: V1/50Hz

=

V2/50Hz V2/100Hz V3/50 Hz V3/100Hz

= = = =

V4/100Hz =

Contrast change with optional gamma correction Contrast change no contrast change no contrast change Contrast change with optional gamma correction Contrast change



  

Figure 8


Technical Data: Video standard: BSA-500: NWA-500:

625 lines, 50Hz Vertical frequency 2:1 Interlaced 625 lines, 50/100Hz Vertical frequency 2:1 Interlaced

Video input/output:

Composite Video signal 1 Vp-p/75 Ohm

Output level of sync signals:

3 Vp-p on RI 150 ohms (negative signals)

Frame store resolution:

512 * 512 pixels 256 Gray levels (8-bits) 1 additional bit for texts and graphics 16-bit frame store for image integrations

Sampling rate:

15 Mhz (square pixels)

Video bandwidth:

6.5 MHz

Hard disk:

without limitation

Keyboard:

Washable and dustproof foil keyboard ASCII characters with additional functions

Power supply:

220V/50-60 Hz ± 15 % or 110V/60 Hz ± 15 % approx. 150 VA

Operating temperature:

10° - 35° Celsius

Dimensions:

19-inch housing 4 AU

Weight:

15 kg

Standards:

DIN, VDE801, VDE871

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation The -M> signal is the increment image memory signal sent to parallel port S4 on the BMS-500 Frame Store Assembly. The-M> signal causes the stored image register to sequence one image. Refer to figure 9 for proper sequencing:

  









Figure 9 The Image Store Memory holds the last fluoro image until the next fluoroscopic exposure or you remove system power. Frame Store Setup: 1. To access the frame store setup menu press and hold the power on button as you press the image save button. 2. To scroll through the setup selections press the image recall button. 3. To select a setup option press the image save button. 4. To change data within an option press the image recall button. Changed data saves when you quit setup. 5. To quit setup scroll to the quit setup selection and press image save.

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation Series: Four selections from the control panel affect the image on the monitor. These include: Reversal, Auto-window, Save and Increment Memory. When you press switch S22 you activate the image reversal function. This creates signal -KMIR. This signal exits the control panel and enters the control logic on PCB B100. It exits the control logic as -KMIR. The KMIR signal travels to the workstation and PCB B104 and exits this PCB as -KMIRIN and enters the keyboard matrix logic on PCB B550. This is the reverse image request signal sent to parallel port S4 on the BMS-100 Frame Store Assembly. The Frame Store Assembly completes the request and sends the reverse image acknowledge signal, -LEDMIR, to PCB B104. In addition, the BMS-100 sends the horizontally modified image signal out port V4 on the NWA500 subassembly to display on the monitor. The signal, -MIRLED, enters PCB B104 and inverts to +LEDMIR and exits this PCB and returns to the control panel to activate LED 22, confirming the completed image reversal request. When you press switch S31 you activate the auto-window function. This creates signal -ENH that travels from the control panel to the workstation and PCB B104. It exits the PCB as -KENHIN and enters the keyboard matrix logic on PCB B550. This is the auto-window request signal sent to parallel port, S4, of the BMS-100 Frame Store Assembly. The BMS-100 Frame Store Assembly completes the request and sends the auto window acknowledge signal, -ENHLED to PCB B104. The BMS-100 sends the modified image out port V4 on the NWA-500 subassembly to display on the monitor. The signal,-ENHLED enters PCB B104 and inverts to +LEDENH. This signal exits this PCB and returns to the control panel to activate LED 31, confirming the completed image request.

                                    Figure 10

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation When you press switch S101 you activate the image save function. This creates signal -KSAFE that travels from the control panel to the workstation and PCB B104. On this PCB the signal becomes -KSAFE and exits as -KSAFEIN. This is the save image request signal sent to parallel port S4 of the BMS-100 Frame Store Assembly. The BMS-100 Frame Store Assembly completes the request by storing the image in the BSA-500C subassembly. The storage capability of the Series 7600 is 400 images. As save requests initiated the BMS-100 Frame Store unit replace the earliest image with the latest image. Images recall by pressing switch 36 on the control panel. This generates signal -KUP that travels to the workstation and PCB B104. The signal exits PCB B104 as -KUPIN and enters PCB B550 and travels to the BMS-100 where the next sequenced image or selected image displays on the left monitor. Image System Video Path: Compact: The CCD chip of the camera head XCD01 receives the intensified image and generates the video-in signal to the VD-01 PCB. This board provides the video signal amplification, circular blanking, video sync, white clip and black level. PCB AU-01 supplements circular blanking and provides window and shading. Camera power supplied by PO2. This supply obtains its operating voltage from the +24VDC portion of NG1. In addition, the -MAG and -HAFDOS signals generated with the control panel switches also enter the camera at PCB B213. These signals place the camera in either the magnification mode or half dose mode. The video-out signal (white wire) exits PCB VD-01 and enters the BMS-500 Frame Store Assembly at the Video In connector of the BSA-500 subassembly. Video Bypass: 1. Disconnect the BSA-500 ‘VIN’ connector. 2. Disconnect the NWA-500 ‘V4’ connector. 3. Connect these two cables using a barrel connector. 4. Set the switch at the rear of the monitor for 15khz operation (12-inch). 5. Set the switch at the rear of the monitor for 16khz operation (17-inch).

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation Series: The Series operates like the Compact. The only difference is the addition of the -GAMMA signal. The -GAMMA signal places the camera in the hand magnification mode. Video Bypass: 1. Disconnect the BSA-500 ‘VIN’ connector. 2. Disconnect the NWA-500 ‘V4’ connector. 3. Connect these two cables using a barrel connector. 4. Set the switch at the rear of the monitor for 16khz operation (17-inch). Image System Printer Control: Compact: When you press control panel switch S24 you request a hard copy. This creates signal -KPRINT. This signal travels through PCB B100 to PCB B104. It exits PCB B104 as -PRINTREQ and travels to the BMS-500 parallel port, S4, pin 11 and exits parallel port, S4, pin 6 as -PRINTACKN. The -PRINTACKN signal travels to PCB B104 and exits this PCB B104 as -PRINTACK*(A) and -PRTACKN(B). The -PRINTACK*(A) or the -PRTACKN(B) signal enters the control panel and exits the control panel as -PRINT. The -PRINT signal travels to PCB B106 and exits in route to the hard copy printer. The hard copy printer returns signal +BUSY to PCB B106. This signal exits this PCB and travels to the control panel to illuminate LED 24. In addition, the BMS-500 Frame Store Assembly transmits the video image out terminal V1 on the NWA-500 and through PCB B106 to the hard copy printer. Series: When you press the control panel switch S32 you create the -KPRINT signal. This signal travels through PCB B100. Through the interconnect cable. Through PCB B104(B) of the workstation to PCB B550. The -KPRINT signal becomes the PRINT signal and exits PCB B550 and travels to the V24, serial connector on the BMS100. It exits the BMS-100 at parallel port S4 and travels through PCB B104(B) and exits this PCB as signal -PRINTACKN. From PCB B104(B) the -PRINTACKN signal travels back to PCB B550 and out as -PRINT to the


hard copy camera. The hard copy camera upon receiving the -PRINT signal generates the +BUSY signal that travels to PCB B550. Where it illuminates LED 49 and becomes the -BUSY signal. From PCB B550 the -BUSY signal travels to PCB B104(B) and exits this PCB as +BUSY. The +BUSY signal travels back through the interconnect cable to the control panel and illuminates LED 32.

Annotation Keyboard Control: Compact: The patient annotation keyboard generates the TXD signal. This signal enters PCB B106 and exits this PCB as RXD. The RXD signal travels to the S2 serial port on the BMS-500 Frame Store Assembly. The BMS-500 generates the signal +RTS. The +RTS signal travels to PCB B106 and exits this PCB as -CTS in route to the annotation keyboard. In addition, the BMS-500 processes the patient text and transmits the text data out the V4 port on the NWA-500 section for display on the monitor. Series: The patient annotation keyboard creats the keystroke address and transfers it to the decoder PCB. The decoder PCB generates the TXD signal and transmits it to the serial port of the BMS-100. The TXD signal becomes a changing state text data signal when you press a key. The BMS-100 generates the +CTS signal. The BMS-100 processes the patient text and transmits the text data out the V4 port on the NWA-500 section for display on the monitor.


Monitor: Compact / Series: Monitor Resolution: In normal operation, set switches on monitor rear panel for 32khz. For monitor line pair resolution, refer to chart: 

  

  



 

Monitor Line Pair Resolution    

Table 6 Monitor Rotation: Compact: There is a Rev. A and a Rev. B PCB B104. In the theory section a signal name proceeded by an (A) or (B) distinguishes any signal name variations between the two PCB’s. If neither an (A) nor (B) follows a signal name then no signal name change has occurred between revisions. PCB B104 Rev. B is backwards compatible to Rev. A. However, PCB B104 Rev. A cannot replace PCB B104 Rev. B. Main transformer T1 provides, through a 1. 6A fuse F5, PCB B111MR transformer T1 with 120VAC. Transformer T1 on PCB B111MR has a 50 ma fuse on each primary leg labeled as F1 and F2. This transformer provides 24VAC through PCB B104 to the direction relays on PCB B103 in the monitor assembly.

COMPACT / SERIES 7600 Imaging System Service Manual - Theory of Operation When you press counterclockwise rotation switch S20 or clockwise rotation switch S21 on the control panel you generate the signal LL (A), (B). This signal travels through PCB B100 and PCB B104 to PCB B103 in the monitor assembly. The direction control logic on this PCB activates the appropriate direction relay. The activation of either relay allows +12VDC to energize the monitor rotation motor. The signal -KON (B) utilized with PCB B104 Rev. B rotates the monitor to the home or center position when the system is initially power on and rotates the monitor to the home or center position when switch S39 remains down anytime after system power is applied. The -KON (B) signal is generated at the control panel and travels to the rotation home position logic on PCB B104 Rev B. The -KON (B) signal is tied into the LL signal path described in the previous paragraph and travels to PCB B103 to activate the appropriate direction relays. When you press both rotation buttons the monitor will rotate to the home or center position. This applies to any system regardless of which PCB B104 revision. Series: The Series 7600 will only incorporate PCB B104 Rev. B. In addition, the Series incorporates PCB B116 in place of PCB B111MR. Main transformer T1 provides, through a 100mA fuse F1, PCB B116 transformer T1 with 230VAC. Transformer T1 on PCB B116 has a 315mA fuse on each primary leg labeled as F4 and F5. This transformer provides 24VAC through PCB B104 to the direction relays on PCB B103 in the monitor assembly. When you press the left monitor counterclockwise rotation switch S20 or clockwise rotation switch S21 on the control panel you generate the signal LL. This signal travels through PCB B100 and PCB B104 to PCB B103 in the monitor assembly. The direction control logic on this PCB activates the appropriate direction relay. The activation of either relay allows +12VDC to energize the monitor rotation motor. When you press right monitor counterclockwise rotation switch S23 or clockwise rotation switch S24 on the control panel you generate the signal RR. This signal travels through PCB B100 and PCB B104 to PCB B103 in the monitor assembly. The direction control logic on this PCB activates the appropriate direction relay. The activation of either relay allows +12VDC to energize the monitor rotation motor.


Hard Copy Camera: Series: When you press the printer switch, S50, on the workstation control panel you create the Key Doku signal. This signal travels to PCB B108 where it energizes the camera collimator control logic. This logic will energize either relay K1 or K2 located on PCB B108 depending on your camera capability. If you have a single image camera you will only have one collimator, M1. If you have a dual image camera you will have collimators M1 and M2. K1 controls M1 and K2 controls M2. The +12v relay control voltage and the +5v collimator motor voltage come from PCB B117. The Key Doku signal also turns on the camera monitor to display the left monitor image. The collimator control logic consisting of U1, U2 and U3 opens the collimator. The camera provides the +VSYNCHRON pulses that feed the PCB B108 counter. Once the image parameters occur the counter signals the collimator control logic to close the collimator and terminating the film exposure. A dual image camera must also be properly jumpered to operate correctly. J2, J9 and J10 located on PCB B108 must be in the 2-BILD position. Concurrently, if you have a single image camera these same jumpers must be in the 1-BILD position.

COMPACT / SERIES 7600 Imaging System Service Manual - Image System

Image System Calibration The procedures within this section provide guidance in the testing and calibration of the 7600 Mobile C-Arm. The following procedures include: • Beam Alignment • Camera Alignment • kV and mA Calibration

Calibration Overview: NOTE: These procedures assume that all parts and subassemblies are fully operational.

Beam Alignment: This portion of the procedure aligns the X-ray beam, collimator assemblies and camera imaging system. This section includes the setup of the C-Arm and equipment necessary to perform a beam alignment. In addition, the Image System Calibration includes mechanical and electrical camera adjustments and monitor calibration verification.

Collimator Iris Calibration: This section includes the sizing of the collimator iris in all three fluoro modes. In addition, you will create a film used as a hard copy verification that the system has met specifications.

Camera Alignment: This section includes numerous camera and monitor adjustments that will enhance and optimize the image position and resolution. Complete the camera alignment after achieving a proper beam alignment.

COMPACT / SERIES 7600 Imaging System Service Manual - Image System kV And mA Calibration: This section includes the adjustments to ensure the proper system output and reduced patient dose. Complete this procedure upon tube replacement or when replacing any kV and/or mA related printed circuit board (PCB).

Additional Tools: • Extender Card, 00-901080 • Extender Cable, 00-901161

Beam Alignment Procedure: Preparation: 1. 2.

Remove the cover from the collimator. Refer to the Component Location section for Removal and Replacement procedures. Utilize a level and position the C-Arm so that the I.I. is on top and level.

Find Center Of I.I. Receptor Field: 1.

Tape a washer to the center of the I.I.

2.

Attach the beam alignment tool to the face of the I.I. Shim the tool, as required, to center it on I.I. Currently there are three different I.I. face plate sizes.

3.

Select the MAG (ZOOM) mode.

4.

Center the alignment tool in the I.I. output field. As you view the image on the monitor, adjust the position of the alignment pattern until centered on the washer.

5.

Switch to the NORMAL mode.


Align X-Ray Source And Collimator Iris With I.I. Field: Alignment Of X-Ray Source: 1.

Remove the two retaining screws that secure the Filter PCB (Figure 1) to the monoblock. Do not disconnect any plugs from the Filter PCB and carefully place the Filter Assembly aside. This will assist you in gaining access to the adjusting screws.







 

   

 

Figure 1

COMPACT / SERIES 7600 Imaging System Service Manual - Image System 2.

Remove the two nuts that secure the angled lead shield to the monoblock. Refer to figure 2. This shield resides just below the Filter Assembly.

 

 

Figure 2 3.

Use a level and level the X-Ray tube using adjustment bolts labeled “A” in figure 3.

4.

Initiate horizontal adjustments by loosening the two recessed screws (Figure 3, Item B) located at the lower edges of the monoblock mounting plate. These two screws also hold the monoblock assembly to the C-Arm. Initiate horizontal adjustments only if absolutely necessary or when replacing or removing the monoblock mounting plate. To Lower Tube

To Raise Tube Loosen A3 Tighten A1 and A2

A1

B

Loosen A1 & A2 Tighten A3

A2

A3

B

MONOBLOCK MOUNTING PLATE Figure 3


Verify that the test rings center on the beam alignment tool. If the rings do not center, make fine tuning adjustments with the bolts.

6.

Secure all the adjustments.

7.

Replace the lead shield and the Filter PCB.

Alignment Of The Iris And Shutter Collimators:  

  

  

  

 

Figure 4 1.

Figure 5

Adjust the iris collimator so that it closes evenly around the washer located in the center of the I.I. Make any adjustments by loosening the four screws (figure 4) and manually adjust the collimator.

NOTE: Remove the shutter to access the iris collimator adjustment screws. 2.

Tighten the four iris collimator screws.

3.

Reposition the shutter collimator and insert the retaining screws.

4.

Adjust the shutter collimator so that it closes evenly on the washer located in the center of the I.I. Make any adjustments by loosening the four screws (figure 5) and manually adjust the shutter collimator.

COMPACT / SERIES 7600 Imaging System Service Manual - Image System NOTE: Rotate the shutter collimator and make sure it remains centered. 

         



Figure 6

Adjust Collimator Field Sizes: 1.

Enable the NORMAL field size.

2.

While viewing the image on the monitor, adjust the size of the NORMAL field using R29 on the B101 PCB (Figure 6). Adjust until the collimator blades clip the outer edge of the field and fall within the “A” ring on the beam alignment tool.

NOTE: You must toggle the collimator blades out of the normal mode and back into the normal mode to detect the effects of the R29 adjustments.


Enable the MAG. (ZOOM) field size.

4.

While viewing the image on the monitor, adjust the size of the MAG. field using R30 on the B101 PCB (Figure 6). Adjust until the blades fall within the “B” ring on the beam alignment tool.

NOTE: You must toggle the collimator blades out of the MAG. mode and back into the MAG. mode to detect the effects of the R30 adjustments. 5.

Enable the HAND field size.

6.

While viewing the image of the on the monitor, adjust the size of the HAND field using R58 on the B101 PCB (Figure 6). Gather information from the physician to determine the correct positioning of the blades in this mode.

NOTE: You must toggle the collimator blades out of the Hand mode and back into the Hand mode to detect the effects of the R58 adjustments.

Verify Beam Alignment: 1.

Insert a film cassette into the Beam Alignment Tool.

2.

Select the MANUAL FLUORO mode.

3.

Select the NORMAL field size and set the technique to 50 kVp. Press the X-ray ON button for 2 seconds.

4.

Select the MAG field size and press the X-ray ON key for 2 seconds.

5.

Collimate to the minimum field size and press the X-ray ON key for 2 seconds.


6.

Develop the film and confirm the field sizes match the following specifications: FIELD SELECTED

FIELD SIZE

RANGE

NORMAL (9/6 II)

9-inches

A

MAG (9/6 II)

6-inches

B

HAND

6-inches

AS PER DOCTOR Table 1

7.

Verify that the minimum field size is less than 5 cm in diameter.

8.

Use a ruler and verify that the center of the image is centered on the sheet of film (in both the X and Y axis) within 20 mm or 13/16 inch.

9.

Send the films to: OEC Medical Systems, Inc. Attention: Technical Support, 384 Wright Brothers Drive, Salt Lake City, UT. 84116.

10.

Remove the Beam Alignment Tool.


Camera Alignment and Monitor Calibration: WARNING: Electrical circuits inside the equipment use voltages that are capable of causing serious injury or death from electrical shock. Use appropriate precautions. NOTES: (1)

Since the X-ray tube head cover is part of the system filtration, it must be in place through out this entire camera alignment procedure.

(2)

** Signify steps that should not be performed unless absolutely necessary.

(3)

Allow the system to warm up for 30 minutes before performing this alignment.

(4)

The beam alignment should be within specifications prior to performing the camera alignment procedures.

Monitor Calibration: 1.

Place the beam alignment tool on the I.I.

2.

Adjust the monitor size according to Table 2, sections H and V.


MONITOR PCB COMPONENT LOCATION  

 

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 

  

  

  



 Figure 7

Size Adjustment: 1.

**Adjust the video image size according to table 2, section D using the distance rin g (Figure 8 and figure 9) on the Camera head.

Adjust Distance Ring CW = Monitor Image Increases in size Adjust Distance Ring CCW = Monitor Image Decreases in size


D

V

DISTANCE RING

H

Figure 8

MONITOR SIZE

Figure 9

H

Specification ± 0.5cm V

D

12-Inch Monitor

15.8 cm/6.25 in

16.2 cm/6.4 in

Ring “A” on Align. Tool

17-Inch Monitor

22.5 cm/8.85 in

23 cm/9 in

Ring “A” on Align. Tool

Adjust with Monitor pot R271, Fig.7

Adjust with Monitor pot R118, Fig.7

Table 2

Adjust Using the Camera Head Distance Ring

COMPACT / SERIES 7600 Imaging System Service Manual - Image System Center The Camera: NOTE: Camera centering determines the position of the circular image field on the monitor.

  

Figure 10 1.

Place a washer in the center of the I.I.


Mark the center of the monitor. Refer to figure 10A. MONITOR

Figure 10A 3.

**Adjust the camera to center the washer on the monitor. Loosen the three camera retaining screws and fluoro as you move the camera. Secure the camera retaining screws once you have centered the washer.

4.

Remove the washer and the mark made on the monitor.

COMPACT / SERIES 7600 Imaging System Service Manual - Image System Adjust Frame Store Digital Blanking: 1.

To access the frame store setup menu press and hold the power on button as you press the image save button.

2.

Scroll through the setup selections to “image position” by pressing the image recall button.

3.

Select the “image position” option by pressing the image save button.

4.

Adjust the position of the image within the edges of the digital blanking by pressing the image record button to enter a negative offset (to shift right) or a positive offset (to shift left).

5.

To quit setup scroll to the quit setup selection and press image save button.

                        

Figure 11 NOTE: You may have to adjust the camera head slightly to center the image on the digitally blanked area. Refer to figure 11A.

         



COMPACT / SERIES 7600 Imaging System Service Manual - Image System MONITOR

Figure 11A

Initial Camera Sensitivity Adjustment: 1. 2. 3. 4. 5.

Remove the beam alignment tool. Place three 1mm copper filters on the X-ray tube assembly. Select the Normal Image Intensifier mode. Place a dosimeter directly on the Image Intensifier surface. In the manual fluoro mode adjust the kV for a dose rate of 7.2 mR/min ( ±6%) at the input to the Image Intensifier. NOTE: The kV setting should be between 75kV - 85kV and the dose should be as close to 7.2 mR/min as possible. If the kV is out of the 75kV - 85kV range or you cannot reach a dose rate close to 7.2mR/min a system failure has occurred. If a system failure has occurred do not complete the camera alignment procedure. Repair the system first.

COMPACT / SERIES 7600 Imaging System Service Manual - Image System 6. 7.

Remove the dosimeter. Adjust the iris pot (Figure 13) for a reading of 6VDC on TP1 (Figure 12) of the AU-01 PCB.



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

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 

 

 

   

Figure 12

  

COMPACT / SERIES 7600 Imaging System Service Manual - Image System CAMERA HEAD COMPONENT LOCATION













Figure 13

Auto Circle: 1. 2.

3.

Move the Video Circle jumper, J2, from the off position to the Test Auto Circle position, J3, on the AU-01 PCB (Figure 12). Adjust pot TM6 on the AU-01 PCB (Figure 12) for a 9cm Auto Circle. There are two ways to accurately adjust the auto circle for 9cm. You can adjust the circle for 3.55 inches measured on the beam alignment tool. Another method is to place a 9cm wire or piece of solder on the center of the II and adjust the circle to the edges of the wire. Return the J3 jumper to the J2 Video Circle Off position.

COMPACT / SERIES 7600 Imaging System Service Manual - Image System Video Signal Adjustments: NOTE: Extend the VD01 PCB to access the potentiometers. 1. 2.

Verify or set the kV to the same kV used in the Initial Camera Sensitivity adjustment. Place the oscilloscope probe on the video output pin of the two pin plug located on the back of the AU-01 PCB and VD-01 PCB camera mother PCB (Figure 14).

VIDEO OUTPUT

CAMERA MOTHERBOARD (REAR VIEW)

Figure 14

Black Level: Adjust pot TM4 on the VD-01 PCB for 50mV to 100mV Black Level outpu t (Figure 15).

White Level: Place one 1mm copper filter (00-877682) on the X-Ray tube. Adjust pot TM1 on the VD-01 PCB (Figure 15) for 1V Peak/Peak video signal out of the camera. Remove the copper filter.

White Clip: Select the auto fluoro mode and view the highest point of the video signal and adjust TM2 on the VD01 PCB until the top edge of the video signal begins to move downward. Then adjust TM2 in the opposite direction 1/4 turn.


Shading: ** Perform only if the camera default shading is not satisfactory. 1.

Select the auto fluoro mode. Place one 1mm copper filter (00-8776820) on the X-Ray tube. Place the J1 jumper on the AU-01 PCB (Figure 12) in the On position and adjust the following potentiometers to achieve uniform shading throughout the image. Set Scope to 0.2 mv/div and 10 µ s/div TM1..........Horz. Parabola TM3..........Horz. Sawtooth

TM1 2.

TM3

Set Scope to 0.2 mv/div and 5ms/div TM2..........Vert. Parabola TM4..........Vert. Sawtooth

TM2

TM4

Leave the J1 jumper, on the AU-01 PCB, in the On position. The default camera shading will occur if you return the J1 jumper to the Off position.


VD-01 PCB COMPONENT LOCATION



 

 

 

 

 

       





    

  

  

     

 





Figure 15

COMPACT / SERIES 7600 Imaging System Service Manual - Image System Final Camera Sensitivity Adjustment: 1.

Center three 1mm copper filters on the X-Ray assembly.

2.

Select the Auto Fluoro Mode.

3.

Place the dosimeter on the Image Intensifier face and adjust the dose to correspond to table 3 (±6%).

4.

Remove the Dosimeter from the Image Intensifier face.

MODE

II MODE

DOSE RATE

ADJUSTMENT

Auto Fluoro Standard

Normal

7.2mR/min

Iris pot on Camera Head (Figure 17)

Auto Fluoro Standard

MAG.

7.2mR/min

P2 pot on the B213 PCB (Figure 16)

Auto Fluoro Low Dose

Normal

3.6mR/min

P1 pot on the B213 PCB (Figure 16)

Table 3 B213 PCB

CAMERA HEAD COMPONENT LOCATION



P1



K1 P2 K2

Figure 16









Figure 17

COMPACT / SERIES 7600 Imaging System Service Manual - Image System Focus Adjustment: 1.

Remove the copper filters.

2.

Place the resolution tool on the Image Intensifier.

3.

Select the Mag mode.

4.

Select the Auto Fluoro mode.

5.

Make sure the low dose mode is off.

6.

Adjust the focus pot on the camera head (Figure 17) to secure the optimum focus.

Line Pair Resolution Test: 1.

Verify the line pair resolution agrees with table 4.

2.

Remove the line pair resolution tool from the image intensifier.

MODE

9 INCH II

Normal

1.4 lp/m m

M ag

1.8 lp/m m

Table 4

COMPACT / SERIES 7600 Imaging System Service Manual - Image System kV and mA Tracking Verification: 1.

Place the 1mm copper filters on the X-ray Tube assembly. Verify the kV and mA tracking agrees with the following chart. kV specification ± 3kV 1 mm COPPER FILTERS

mA specification ± 10% 9 INCH II

1 Filter

62 kV @ 1.8mA

2 Filters

73 kV @ 2.5 mA

3 Filters

82 kV @ 3.0 mA Table 5

kV Calibration: WARNING: Electrical circuits inside the equipment use voltages that are capable of causing serious injury or death from electrical shock. Use appropriate precautions. NOTES: (1) (2) 1. 2. 3.

Allow a 30 minute warm up time prior to performing the calibration You can verify kV calibration with a calibrated, non-invasive meter such as the Keithley Triad System with the wide range filter pack or the Victoreen 4000 Plus.

Place a lead shield in the X-ray beam to protect the I.I. and the CCD camera. Extend PCB B64 and clip the positive lead of your DVM on pin 17c on PCB B64. Place the negative lead on pin 31a. Refer to figure 18 for the location of pins 17 and 31. Manually select 75 kVp. Do not make an exposure. Adjust P1 on PCB B64 to achieve a reading of 10.125 VDC. Refer to figure 18 for the location of P1.


1 c a

P1

31 c a

B 6 4 (Top View)

Figure 18 4. 5. 6. 7. 8.

Place the DVM lead on TP f on PCB B54 and use the ground reference on PCB B54 located within the Monoblock assembly card rac k (Figure 19). TP f represents the high voltage ratio of 10,000:1. Select a 75kV standard fluoro exposure and adjust R28 on the Control Rack B100 PCB (Figure 20) so that the measured voltage on PCB B54 TP f = 7.5VDC. While taking a 36kV standard fluoro exposure, verify that the measured voltage on PCB B54 TP f = 3.6VDC. While taking a 100kV standard fluoro exposure, verify that the measured voltage on PCB B54 TP f = 10VDC. Repeat steps 5 - 7 if necessary.














 

 









Figure 19

Figure 20



>56 kV Hip Mode “HV Power” Calibration: 1.

2. 3. 4.

5.

Use your DMV to monitor the “HV Power”. GND = Chassis. Accomplished this at either: a. X1 - 2 or XP1 - 2 on the Filter PCB. Refer to figure 1 for the location of X1. b. Positive (+) side on capacitor C1 in the power plate assembly. Capacitor C1 resides behind the terminal strip of the power plate assembly. Refer to figure 2 in the component removal/replacement section of the service manual for the location of the terminal strip. Manually select 36kV in the standard mode and note the voltage displayed on the DVM. Select the hip mode. While observing the DVM display, manually increase the kV and note at what kV the DVM display increases sharply. You should also hear a relay energize at this time. The relay should energize at 56kV 57kV. If it does not energize at this time go to step 5. If it does energize the kV calibration is complete. Manually decrease the kV to 36kV and take an exposure.

NOTE: This step should discharge C1 and return the charge to the lower value observed in step 2. 6.

Adjust R29 on PCB B100 to obtain the results listed in step 4.


mA Calibration: WARNING: Electrical circuits inside the equipment use voltages that are capable of causing serious injury or death from electrical shock. Use appropriate precautions. NOTES: (1)

All adjustment Pots and Test Points are on the Control Rack PCB B143 unless instructed otherwise.

(2)

Allow 30 minute warm up time prior to performing the calibration.

(3)

Complete the kV Calibration prior to performing the mA calibration.

P3

P5

P8

TP3

P4 TP8 TP1

TP6 R52 TP9

Gnd TP5

TP2 P1

IC7

P6

P2 P7

X3

KK2 4

B143

Figure 21

2 1


Preheat: Fluoro: 1. 2. 3. 4. 5. 6. 7. 8. 9.

Remove the X-Ray tube cover. Adjust P5 for a meter reading of 10VDC ( ± 5mv) on TP5 (TP6 Gnd). Adjust P1 for a meter reading of 0VDC on TP3 (TP6 Gnd). Place a meter (set to milliamps) in place of the mA jumper on the X-ray head assembly. Refer to figure 23 for the location of the mA jumper. Place a jumper across R52 or jumper from TP8 to TP9 on PCB B143. Refer t o Figure 21 for the location of R52, TP8 and TP9. Select the manual fluoro mode and dial in 36kVp. While making an X-ray, adjust the current to 150 µA ±10µA with P3. Remove the jumper across R52 or TP8 and TP9 on PCB B143. Remove the meter and replace the mA jumper.

Film: 1. 2. 3.

4.

Select the film mode and dial in 36kVp. Place a voltmeter between TP6 (GND) and X3, pin 4 on PCB B143. Refer t o figure 21 for the location of TP6 and the X3 connector. Press the handswitch button for less than 1 second, this will place K2 on PCB B143 in the film mode without producing X-rays, and adjust the voltage to 15.5 volts ±0.5 volts using P4. Refer to figure 21 for the location of P4. Step 3 may have to be repeated to achieve the desired voltage output.

COMPACT / SERIES 7600 Imaging System Service Manual - Image System Overshoot: 1. Select film mode and dial in 110kVp. 2.

Dial in a time of 1.5 seconds.

3.

Place a storage capable oscilloscope between TP1 (-) and TP2 (+).

4.

Press the handswitch until the exposure terminates.

5.

Check the leading edge for overshoot or undershoot. If either overshoot or undershoot occurs trim it with P4. Refer to figure 22.

Overshoot, Adjust P4

Figure 22

COMPACT / SERIES 7600 Imaging System Service Manual - Image System mA Output: 1. 2.

Place a lead shield in the X-ray beam to protect the I.I. and the CCD camera. Remove power to the system. kV SENSE TEST POINT



FILTER BOARD NPUT / OUTPUT SIGNALS

TO CONTROL RACK

MOUNTING PLATE

 

                                          

PORT









                           

             

                            



           

B41 MOTHER BOARD

    

XRAY HEAD GENERATOR BOARDS

Figure 23

COMPACT / SERIES 7600 Imaging System Service Manual - Image System 3. 4. 5. 6.

7. 8.

9. 10. 11.

Place a meter, set to measure milliamps, across the mA jumper on the X-ray head assembly. Refer to Figure 23 for the mA jumper lo cation. Manually fluoro at 36kV, adjust P7 (Figure 21) for a meter reading of 0.2mA. Manually fluoro at 80kV, adjust P6 (Figure 21) for a meter reading of 3.0mA. Adjust R55 on PCB B100 (Figure 20) to display 0.0 on the mA display. The most accurate way is to adjust R55 CW until the display reads +0.1. Then CCW until the display reads -0.1. Then adjust R55 to the center of this range. During a 80kV manual fluoro exposure adjust R49 on PCB B100 (Figure 20) so the control panel display matches the actual mA displayed on the DVM. This should be 3.0 mA. During a 36kV manual fluoro exposure verify that the actual mA on the DVM is 0.2mA and the control panel display matches. If the control panel display does not match the DVM mA repeat steps 7 8. If the DVM mA is not 0.2 at 36kV repeat steps 4 - 5. Select the film mode. During a 2 second, 36kV exposure, adjust P2 (Figure 21) for a 20mA reading on the multimeter. Replace the mA jumper.

Entrance Exposure: NOTE: Measure the entrance exposure 12 inches (30cm) above the center of the I.I. 1. 3. 4. 5.

Replace the X-ray cover. 2. Select the Hip mode. During a manual fluoro 110kV exposure, adjust P8 (Figure 21) for the maximum mA (not to exceed 6.0mA) at the control panel. Place a Dosimeter 30cm up from the face of the II, centered in the X-ray beam. Do not exceed the 10R/ dose rate at this technique. Adjust P8, (Figure 21) if needed, so that the output does not exceed 10R/Min.

COMPACT / SERIES 7600 Imaging System Service Manual - Component Location

Component Location Compact

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Figure 1


F1

F2 2 F

K1

2 F

B111

B111 MR

F1

F1

SIDE VIEW

B105

CONTROL PANEL

Lift MOTOR

HANDSWITCH

POWER PLATE ASSEMBLY B106

ISOLATION PCB

B100 B64 OPEN

NG-1 NG-2

B104 B102 B101 OPEN B143

BR1 BR2

COUNTER TERMINAL STRIP F 5

F 4

000000

B79

CONTROL RACK

0 0 C 0 0 0 0 0 1 - 5 - 0 5 - A U A 5 A S P W C N S B B

K2 F3

TRANSFORMER, T1

Figure 2

BMS-500 IMAGE PROCESSOR (FRAME STORE)

REAR VIEW


B213

AU-01

CCD CAMERA

VD-01 B214

B34

B212

IMAGE INTENSIFIER kV SENSE TEST POINT

f

B45

FILTER BOARD INPUT / OUTPUT SIGNALS TO CONTROL RACK

MOUNTING PLATE

mA JUMPER

L L O C

L O R T N O C R O T A MI

PORT

S N E S E R U T A R E P M E T

R O

B43

B54 E C A F R E T NI

N OI T A L U G E R V k

IL F

N OI T A L U G E R T N E M A

B42

IC G O L T L U A F

B40

R E V I D S O M R E W O P

R

E G A T L O V H GI H

E VI R D

B41 MOTHER BOARD

X-RAY TUBE

HIGH VOLTAGE TANK

XRAY HEAD GENERATOR BOARDS

Figure 3

E VI R D T N E M A LI F

COMPACT / SERIES 7600 Imaging System Service Manual - Component Location  

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Figure 4


ROTATION RING

S I C E T 1 0 7

W M B 0 1

W M C 0 1

MOTOR

WMN01 WMA02

SIDE VIEW Figure 5

M O N I T O R

COMPACT / SERIES 7600 Imaging System Service Manual - Component Location Series

CCD CAMERA IMAGE INTENSIFIER

C-Arm:

C-ARM

CONTROL PANEL

COMPACT 7600

HANDSWITCH HOLDER/ RECEPTACLE

FOOTSWITCH RECEPTACLE

REAR COVER

INTERCONNECT CABLE FRONT COVER FOOTSWITCH HOLDER

FRONT LEG MONOBLOCK: X-RAY TUBE

OEC

WHEELS

OEC

GENERATOR COLLIMATORS

Figure 6


F1

F2

K1

2 F

SIDE VIEW

B111 F1

B105

CONTROL PANEL

LIFT MOTOR

HANDSWITCH

POWER PLATE ASSEMBLY ISOLATION PCB

B106

B100

NG-1

B64 OPEN OPEN B102

C1

BR1 BR2

OPEN

COUNTER TERMINAL STRIP F 5

B101 B143

F 4

000000

B79

K2 F3

TRANSFORMER, T1

REAR VIEW

Figure 7

CONTROL RACK


0 0 0 C 0 0 0 0 0 0 1 5 5 0 5 U A A 5 A P W W A S C N N S B

B

Hard Copy Camera

B117

TR1

B116

B104

B108

TS1

Front

Right Side Figure 8

Left Side


Cover and Component Removal WARNING: ELECTRICAL CIRCUITS INSIDE THE EQUIPMENT USE VOLTAGES THAT ARE CAPABLE OF CAUSING SERIOUS INJURY OR DEATH FROM ELECTRICAL SHOCK. CAUTION: Voltage and data cables can interfere with the cover removal. Take extreme care when removing and replacing all covers.

Compact: Rear Cover: 1.

Unplug the system from the AC power.

2.

Remove the two screws located on the lower front section of the rear cover and the screw located on each side of cover.

3.

Move the cover toward the floor. (This will release the top tab restraints.)

4.

Pull the cover away from the system .

5.

Remove the ground wire.


Front Cover: NOTE: Remove the rear cover before removing the front cover. 1. Remove the two screws from each side of the front cover. 2.

Remove the three screws from the bracket securing the monoblock and the I.I. voltage and data cables.

3.

Remove the two screws securing the footswitch plug receptacle.

4.

Remove the external ground post from the front leg.

5.

Pull the front cover away from the system.

6.

Remove ground wire.

Series: Workstation: Rear Cover: 1.

Remove the ten screws securing the rear cover. Six along the sides and four around the power cordplate.

2.

Pull the cover back away from the system.

3.


Front Cover: 1.

Remove the two screws along each side of cover.

2.

Pull cover away from workstation.

3.

Remove ground wire.


Control Panel Assembly: NOTE: Remove the rear and front covers before removing the control panel assembly. 1. Raise the cross arm at least 12 inches. 2.

Loosen the four screws at the rear of the control panel assembly.

3.

Remove the two screws located underneath the front of control panel assembly.

4.

Remove or loosen the screw (earlier systems needed the screw removed, later systems needed it loosened) from the lower portion of the steering handle shaft. Lift the handle out of the control panel sleeve.

5.

Remove the control panel assembly retaining plate located in the center rear of the control panel assembly by removing the two nuts located on the underside of this retaining plate.

NOTE: These nuts are difficult to remove. Lift the control panel slightly to gain better access. 6.

Lift and pull the control panel forward. Remove the control panel cable on the left side.

7.

Position the plastic control panel collar so that the control panel assembly moves freely.

8.

Lay the control panel assembly to the right side of the system. Label and remove any cables that may prevent control panel movement.

9.

Remove the control panel retaining screws and cables.

COMPACT / SERIES 7600 Imaging System Service Manual - Component Location Lift Motor: CAUTION: Place a support block between the cross arm and the main chassis. NOTE: Remove the front and rear covers and the control panel before removing the lift motor. Refer to figure 2 for the motor location. 1. Remove the two motor cables connected to the B111MR PCB. Refer t o figure 2 f 2 for or the PCB location. 2.

Remove the three hex screws securing the lift motor to the chassis.

3.

Loosen the collar set screw securing the motor to the threaded shaft.

4.

Lift the motor straight up.

Camera Removal And Replacement: Replace the CCD camera and camera electronic rack as an assembly . CAUTION: Always wear a properly grounded static protection wristband when working with the CCD camera. Removal: 1. Remove the two screws on each side of the camera cover. 2.

Lift the cover off the I.I. assembly assembly..

3.


4.

Remove the four screw Remove screws s from from the plate located on the inside, rear rear,, section section of the I.I. housing housing.. This is necessary to gain access to PCB B212.

5.

Disconnect the camera electronic rack rack plug from PCB B212. Make a note of the plug orientation.

COMPACT / SERIES 7600 Imaging System Service Manual - Component Location Location 6.

Disco Di sconn nnect ect th the e vide video o plug plug fro from m the the cam camer era a elec electro tronic nics s rac rack k moth mother erbo boar ard. d.

7.

Disco Di sconn nnect ect th the e CCD CCD ca came mera ra pl plug ug fr from om the ca came mera ra ele elect ctro roni nics cs rac rack. k.

8.

Remove Remov e the fo four ur scre screws ws (Figu (Figure re 9, #1) from the plat plate e that that attach attaches es the the camera camera elec electro tronics nics rac rack k and lea lead d shield to the I.I. assembly.    

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Figure 9

COMPACT / SERIES 7600 Imaging System Service Manual - Component Location Location

9.

Lift the electronic assembly off of f the I.I. I.I . assembly. assembly.

10.

Remove the Remove the four four screw screws s that hold the the electronic electronics s rack, rack, lead lead shield shield and and plate plate together together and separa separate te them. them. Reattach and secure the lead shield and the plate to the new electronics rack.

11.

Remov Rem ove e the the thr three ee scr screw ews s from from the CCD cam camer era a coll collar ar..

12.

Liftt the Lif the CCD CCD came camera ra of offf the the I.I. I.I. as asse semb mbly ly..

Replace: 1. Place Plac e the the new new CCD CCD camer camera a in the I.I. hou housing sing and cen centere tered d camer camera a within within the ret retaini aining ng ring ring.. 2.

Tighten the thr Tighten three ee scre screws ws to to a poin pointt that that still still perm permits its side to side side mo move vemen ment. t. It may may be nece necessa ssary ry to perform additional adjustments when you complete the camera alignment procedures at the conclusion of the camera assembly replacement.

3.

Feed Fe ed the the cam camer era a elec electr tron onic ic rac rack k data data cab cable le dow down n thro throug ugh h the the I.I. I.I. ho hous usin ing. g.

4.

Secure Sec ure the fo four ur scre screws ws (#1) (#1) tha thatt hold hold the the elec electro tronics nics ra rack ck to the I.I. asse assemb mbly ly..

5.

Attach the cam Attach camer era a elect electron ronics ics rac rack k plug plug into into PCB B21 B212 2 and and repla replace ce the the four four scr screw ews s that that secu secure re PCB PCB B212 to the inside, rear section of the I.I. housing.

6.

Plug Pl ug the the vid video eo cab cable le int into o the the elec electr tron onic ic rac rack k moth mother erbo boar ard. d.

7.

Conn Co nnec ectt the the CC CCD D cam camer era a plu plug g to to the the el elec ectr tron onic ics s rac rack. k.

8.

Reffer to Re to the Ima Image ge Syst System em Cal Calib ibra ratio tion n secti section on and and comp complet lete e the the camer camera a align alignme ment nt..

COMPACT / SERIES 7600 Imaging System Service Manual - Component Location Image Intensifier Removal: WARNING: IMAGE INTENSIFIER TUBES MAY IMPLODE IF STRUCK OR SUBJECTED TO SEVERE MECHANICAL SHOCK. MINIMIZE THE RISK OF INJURY FROM FLYING GLASS BY WEARING PROTECTIVE CLOTHING AND SAFETY GOGGLES WHEN SERVICING THIS COMPONENT. 1.

Remove the camera and the camera electronics rack. Refer to the camera removal procedure.

2.

Disconnect the cables extending from the C-Arm into the I.I. assembly.

3.

Remove the three screws located inside the I.I. housing that secure the I.I. to the C-Arm.

4.

Refer to the Image System Calibration section and complete the tracking and the image resolution procedures.

Power Supply, NG1 And NG2, Removal: 1.

Disconnect and mark the two cable bundles extending from each supply.

2.

Remove all the screws securing the metal mesh plate to the power supplies.

3.

Disengage the rubber retaining grommets from the metal mesh plate.

4.

Remove the metal mesh plate.

5.

Disengage the wing nuts, two per supply, and retaining screws, two per supply, located at the rear of each supply (Some systems may only have the two wing nuts).

6.

Pull the supply away from the power plate assembly (You may have to cut some tie-wraps and/or disconnect some additional connectors to remove the supplies. Be sure to mark these connectors appropriately).

COMPACT / SERIES 7600 Imaging System Service Manual - Component Location X-ray Head And Collimator Removal: WARNING: THE X-RAY TUBE HOUSING CAN CAUSE SEVERE BURNS. DO NOT TOUCH THE HOUSING UNTIL THE HOUSING HAS COOLED. THE MONOBLOCK ASSEMBLY WEIGHS APPROXIMATELY 40 LBS. NOTE: If you move the X-ray tube, perform a beam alignment procedure. If you replace the X-ray tube complete the kV/mA, tracking and final camera sensitivity adjustments. 1.

Rotate the C-Arm so that the monoblock is at its lowest position.

2.

Lower the cross arm to its lowest position.

3.

Lift the monoblock rubber bumper off the retaining studs located on the rear of the monoblock.

4.

Pull the bumper forward to release it from the guides.

5.

Remove the four screws securing the monoblock cover and the bumper guides to the monoblock. Two screws on each side.

6.

Lift the cover away from monoblock.

7.


8.

Unplug the three connectors located on the bottom of the Filter PCB. These three connectors feed the voltage and/or the data cables out to the monoblock.


 

  

Figure 10 9.

Remove the Filter Board by removing the two retaining screws.

10.

Remove the lead shielded cover (Figure 10) located directly below the Filter PCB.

11.

Remove the ground wires from the stud located near the mA jumper. Refer t o figure 3 for the mA jumper location.

12.

Properly support the monoblock and remove the two remaining nuts that secure the monoblock to the C-Arm. The location of these two bolts is on the threaded shafts that also secured the lead shield plate that you removed in step 9.

NOTE: Steps 13 and 14 are only necessary if the new monoblock assembly does not have a collimator assembly. 13.

Remove the four hex screws securing the shutter collimator to the monoblock and disconnect cabling.

14.

Remove the four hex screws securing the iris collimator to the monoblock and disconnect cabling.


Control Rack: 1.

Disconnect all the cables going to the control rack. Label them appropriately.

2.

Remove the two screws located on the lower right edge of the rack.

3.

Remove the two screws located on the upper front of the rack.

4.

Pull the rack away from the system.

BMS-500: 1.

Remove power from system and disconnect any cables.

2.

Remove the screws that secure the BMS housing to the main housing assembly.

3.

Pull the BMS housing away from main housing.

BMS-100: 1.

Remove power from system and disconnect any cables.

2.

Remove the two screws along the top and bottom bracket that secure the BMS housing.

3.

Pull the BMS housing away from main housing.

Wheel Cover: 1.

Loosen the two screws, located on the rear of the cover, that secure the cover and the retaining plate to the chassis.

2.

Loosen the two screws located underneath the wheel cover near the outer edge of the cover.

oec-7600-servicemanual.pdf

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