# Service Bulleti **n**

523-0816423-301 000
**NAVIGATION TDR-94 ATC/MODE S TRANSPONDER (CPN 622-9352-007/008/207/308/309)**  **TDR-94D ATC/MODE S TRANSPONDER (CPN 622-9210-007/008/207/308/309) CPU I/O Programmed Circuit Card A5**  **(CPN 653-3674-003/004/005/006/007/008/009/ 010/011/012/013/014/015/016/019/020/021/022)**  **Video Processor Circuit Card A6 (CPN 687-0726-004/005/006/007) SERVICE BULLETIN 507**  **REVISION NO. 3**
**ADDITION OF ADS-B CAPABILITY (CONVERTS -007/008/207/308/309 TO -409)** 

TRANSMITTAL INFORMATION SUMMARY **S u**  **m m**  **a r** **y** This is revision 3 of SB "507" for the TDR-94/94D ATC/Mode S Transponder. This revision adds CPN 687-0726-007 to the modification procedure. The format and content of this service bulletin are updated to current publication standards. Black bars in the margins indicate the changes. Replace revision 2 with this revision. **S e**  **r v**  **i c** **e B**  **u l**  **l e** **t i**  **n R**  **e v**  **i s**  **i o**  **n H**  **i s** **t o**  **r y** 
**REVISION DATE OF RELEASE** Initial Release September 9, 2008

Revision 1 October 13, 2008 Revision 2 November 16, 2009 Revision 3 December 5, 2011

Export Control Classification Notice (ECCN) for this document is 6E991. © Copyright, 2011 Rockwell Collins. All rights reserved Sep 9/08 TDR-94/94D-34-507 3-Dec 5/11 Page 1 of 23

# Service Bulleti **n**

N OT E : This service b ulletin may be installed only by Rockwell Collins or an authorized Rockwell Collins Service Center. N OT E : Implied by reference from this service bulletin, previously issued service bulletins that are applicable to the old unit (to be converted) are also applicable to the unit created by this service bulletin. Mark out all SBs that are incorporated. The new unit part number is identification of the installation of this service bulletin. Do not mark out Service Bulletin "507".

**Software License and General Conditions of Sale** For each software license procured, the Software License for Equipment Specific Software, reproduced below, shall apply. **Software License for Equipment Specific Software** Software de livered hereunder, either embedded in equipment described herein or specifically designed for use in or with such equipment, is copyrighted by the seller and shall remain the sole and exclusive property of seller. Seller grants the buyer a perpetual, worldwide, non-exclusive license to use the software only in or with the equipment. The buyer shall not copy, modify, or disassemble the softwa re, or permit others to do so. Buyer shall not transfer the license granted hereby or possession of the software except as part of or with the equipment, such transfer being subject to the restricti ons contained herein. Seller may terminate this license upon written notice for violation of any of the terms of the foregoing license. Should the customer have any questions concerning the scope of permitted use, please contact your Rockwell Customer Service Engineer. Rockwell Collins' General Conditions of Sale 074-8431-866 (Rev 06/03) are incorporated herein by reference.

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# Service Bulleti **n**

**1. P l**  **a n**  **n i**  **n g**  **I n**  **f o**  **r m**  **a t**  **i o**  **n** A. Effectivity The modification procedure described in this service bulletin is applicable to TDR-94/94D ATC/Mode S Transponder units listed in the following table. **ROCKWELL COLLINS PART NUMBER UNIT**  **BEFORE CONVERSION AFTER CONVERSION** 622-9352-007 622-9352-409 622-9352-008 622-9352-409 622-9352-207 622-9352-409 622-9352-308 622-9352-409 TDR-94

622-9352-309 622-9352-409 622-9210-007 622-9210-409 622-9210-008 622-9210-409 622-9210-207 622-9210-409 622-9210-308 622-9210-409 TDR-94D

622-9210-309 622-9210-409 N OT E : The modification contained in this service bulletin is strictly applicable to the status(es) listed and not applicable to additional status(es) within the TDR-94/94D or additional status(es) within the equipment family. N OT E : Installation of units modified in accordance with this service bulletin may require a change to the aircraft TC/STC data unless the new equipment part number is already included in the data. B. Concurrent Requirements Service Bulletins 21, 24 and 29 must be installed prior to or at the same time as this service bulletin. C. Reason (1) Condition Modification Affects The -007, -008, -207, -308 and -309 units do not have ADS-B capability. (2) Extent Condition Encountered All -007, -008, -207, -308, and -309 units requiring ADS-B capability. (3) Scope of Modification This modification is a permanent change.

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# Service Bulleti **n**

(4) Expected Benefits of Modification Converted units will have ADS-B capability. For the -007 and -008, units will add GAMA Label 102G “Selected Altitude” Compatibility. For the -008, -308, units, the SB provides the proper transition of Mode S capability during ground to air transition. D. Description For the -007/207 units, the CPU I/O card is replaced. On the -008/308/309 units, software is updated, a jumper wire is removed, and a capacitor is added to video processor circuit card A6. The identification plate is changed on all units to reflect the new part number. E. Compliance Optional. F. Approval TDR-94 (CPN 622-9352-409) conforms to FAA TSO C112 Class 3A2 121 010, C166a Class A3 - Transmitting Only. TDR-94D (CPN 622-9210-409) conforms to FAA TSO C112 Class 3A2 121 011, C166a Class A3 XMT Only. Installation of this service bulletin changes the part number of the TDR-94/94D as listed in paragraph 1.A. Installation of units modified in accordance with this service bulletin may require a change to aircraft TC/STC data unless the new part number is already included in the data. G. Labor Estimated: 2.5 labor hours for installation and testing. H. Weight and Balance Not affected. I. Electrical Load Data Not affected. J. Software Accomplishment Summary Software Accomplishment Summary document (CPN 829-8879-111), is written in accordance with RTCA-DO-178( ). K. References TDR-94/94D (-004 Status and Higher) ATC/Mode S Transponder (ICA) component maintenance manual (with illustrated parts list) (CPN 523-0778502) (34-50-96).

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# Service Bulleti **n**

Avionics Standard Shop Practices Instruction Book (CPN 523-0768039) (20-00-01). All Avionics Service Information Letter 3-93, titled "Non-Procurable Equipment Cleaning Solutions" (CPN 523-0804806). All Avionics Service Information Letter 3-03, titled "Disposal of Retired TSO Nameplates" (CPN 523-0806251). All Avionics Service Information Letter 05-2, titled “Clarification and Information on Usage and Ordering of Collins Nameplates and Modification Plates” (CPN 523-0806340). L. Other Publications Affected The next full revision to the above referenced component maintenance manual (with illustrated parts list) will include the information contained in this service bulletin.

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# Service Bulleti **n**

**2. M a** **t e**  **r i**  **a l**  **I n**  **f o**  **r m**  **a t**  **i o**  **n** A. Cost and Availability The charge to install this service bulletin will be labor and material as quoted by the installing service agency. This service bulletin may be installed only by Rockwell Collins or an authorized Rockwell Collins Service Center. The equipment owner bears responsibility for cost of installation of this service bulletin. B. Material Required Use the following materials to modify one TDR-94 (CPN 622-9352-007/207/008/308/309).
**ROCKWELL COLLINS PART NUMBER**  **QTY DESCRIPTION**

280-3778-050 AR MOD Chart 685-2622-030, 685-2622-040 (Preferred), or 685-2622-031 AR Plate, Identification (TDR-94)

280-3847-040 1 Label, Pressure Sensitive 653-1328-002 1 Cover, Modulator Circuit Card Assembly 653-2283-002 1 Shield, Synthesizer 653-3674-018 or 653-3674-022 or 653-3674-024 1 CPU I/O Programmed Circuit Card (TDR-94)

1 913-3667-230 1 Capacitor, 470 pF 859-6700-010 2 Connector 1 Required for conversion from -008/308/309.

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# Service Bulleti **n**

Use the following materials to modify one TDR-94D (CPN 622-9210-007/207/008/308/309).
**ROCKWELL COLLINS PART NUMBER**  **QTY DESCRIPTION**

280-3778-050 AR MOD Chart 685-2613-028, 685-2613-034 (Preferred), or 685-2613-029 AR Plate, Identification (TDR-94D)

280-3847-040 1 Label, Pressure Sensitive 653-1328-002 1 Cover, Modulator Circuit Card Assembly 653-2283-002 1 Shield, Synthesizer 653-3674-017 or 653-3674-021 or 653-3674-023 1 CPU I/O Programmed Circuit Card (TDR-94D)

1 913-3667-230 1 Capacitor, 470 pF 859-6700-010 2 Connector 1 Required for conversion from -008/308/309. C. Special Equipment or Tooling Required Boardsite Profile Data (CPN 613-6608-111) Program Data (CPN 829-8884-111, CPN 832-3615-111, CPN 815-7871-111) Boardsite Interface Adapter (CPN 685-6400-002 or equivalent)

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# Service Bulleti **n**

**3. A c**  **c o**  **m p**  **l i**  **s h**  **m e**  **n t**  **I n**  **s t**  **r u**  **c t**  **i o**  **n s**  A. Modification Procedure CAU T I O N : THIS EQUIPMENT CONTAINS ELECTROSTATIC DISCHARGE SENSITIVE (ESDS) COMPONENTS THAT CAN BE DAMAGED BY STATIC VOLTAGES PRESENT IN MOST REPAIR FACILITIES. N OT E : For detailed repair/cleaning instructions, refer to Avionics Standard Shop Practices Instruction Book. (1) Inspect top level Collins part number. (a) If CPN is 622-9210-007/207 or 622-9352-007/207, proceed to step 3.A.(2). (b) If CPN is 622-9210-008/308/309 or 622-9352-008/308/309, proceed to step 3.A.(9). (2) Modification procedure for CPN 622-9210-007/207 and CPN 622-9352-007/207. (3) Refer to the disassembly instructions in the Disassembly section of the referenced component maintenance manual (with illustrated parts list). Disassemble the unit as required to remove the Main Chassis Assembly (CPN 653-2254-XXX) and the Transmitter Assembly (CPN 653-2255-0XX). (4) Refer to Figure 1. Locate, remove and discard CPU I/O Programmed Circuit Card A5 (CPN 653-3674-003/004/005/006/007/008/009/010/011/012/013/014/019/020). (5) Install new CPU I/O Programmed Circuit Card A5 per the following chart. If CPN 653-3674-023 or 653-3674-024 is unavailable, proceed to step 3.A.(6) for instructions for using CPN 653-3674-017 or CPN 653-3674-021 in the top level CPN 622-9210-007/207 and for using CPN 653-3674-018 or CPN 653-3674-022 in top level CPN 622-9352-007/207. Otherwise, proceed to step 3.A.(7).
**T/L CPN CPU I/O PROGRAMMED CIRCUIT CARD A5** 622-9210-007 653-3674-023 622-9352-007 653-3674-024 622-9210-207 653-3674-023 622-9352-207 653-3674-024

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# Service Bulleti **n**

(6) If CPN 653-3674-023 or CPN 653-3674-024 is unavailable, use CPN 653-3674-017 or CPN 653-3674-021 for top level CPN 622-9210-007/207; or CPN 653-3674-018 or CPN 653-3674-022 for top level CPN 622-9352-007/207. Reprogram per the following instructions. (a) Install Boardsite Profile (CPN 613-6608-111) into the Boardsite working directory using the import command from the FILE menu option. Do not copy the files within DOS, as this will erase the catalog in the working directory. Specify the drive and directory where the profile exists (either floppy drive or a directory other than the working directory). IMPORT the board profile CPN 613-6608-111. (b) Install the Program Data (Page 0: CPN 829-8884-111, Page 1: CPN 832-3615-111, Page 2: 815-7871-111) into the Boardsite working directory using the TRANSLATE command from the COMMUNICATIONS menu option. Follow the steps below to translate and combine the two Program Data files into one Boardsite programming file. 1 . Select COMMUNICATIONS from menu. 2 . Select TRANSLATE from menu. 3 . Select ASCII for conversion from ASCII to Boardsite. 4 . Enter location and data file name for Page 0 DOS ASCII FILE SOURCE. 5 . Enter Boardsite name: 831-6270-111. 6 . Enter 200 for offset. 7 . Enter RETURN for offset hi. 8 . Enter 200 for begin address. 9 . Enter 2FE00 for block size. 1 0 . Select INTEL MCS-86 HEX OBJ for the I/O format. 1 1 . Enter FF for fill byte. 1 2 . Press ALT-B to begin. 1 3 . After translation of Page 0 is complete, press any key to return to the translate menu. 1 4 . Select ASCII for conversion from ASCII to Boardsite. 1 5 . Enter location and data file name of Page 1 DOS ASCII FILE SOURCE. 1 6 . Enter Boardsite name: 831-6270-111. 1 7 . Enter 200 for offset. 1 8 . Enter RETURN for offset hi. 1 9 . Enter 10200 for begin address. 2 0 . Enter FE00 for block size.

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# Service Bulleti **n**

2 1 . Select INTEL MCS-86 HEX OBJ for the I/O format. 2 2 . Enter FF for fill byte. 2 3 . Press ALT-B to begin. 2 4 . Press “Y” to merge this file with the previous file. 2 5 . After translation of Page 1 is complete, press any key to return to the translate menu. 2 6 . Select ASCII for conversion from ASCII to Boardsite. 2 7 . Enter location and data file name of Page 2 DOS ASCII FILE SOURCE. 2 8 . Enter Boardsite name: 831-6270-111. 2 9 . Enter 200 for offset. 3 0 . Enter RETURN for offset hi. 3 1 . Enter 20200 for begin address. 3 2 . Enter FE00 for block size. 3 3 . Select INTEL MCS-86 HEX OBJ for the I/O format. 34 . Enter FF for fill byte. 3 5 . Press ALT-B to begin. 3 6 . Press “Y” to merge this file with the previous file. (c) Once the Profile and Program Data have been installed in the Boardsite working directory, the CPU I/O Circuit Card A5 may be programmed as follows. 1 . Install the CPU I/O Circuit Card on the Boardsite Interface Adapter (CPN 685-6400-002 or equivalent). 2 . Press ESC key. 3 . Select the COPY command. 4 . Select 613-6608-111 circuit card profile. 5 . Select the DISK file source. 6 . Select 831-6270-111. 7 . Press ALT_B to begin. N OT E : Programming procedure will take approximately 1 minute. (d) Ensure that the programming operation completes with no errors as indicated on the screen. The Boardsite will return a checksum of 01CC5FEA and a 32 bit CRC of AD022568. (e) Mark a new label (CPN 280-3847-040) with CPN 831-6270-111.

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# Service Bulleti **n**

(f) Remove existing label from programmed assembly (CPN 831-6270-XXX) and replace it with the label marked in the previous step. (7) Transmitter Assembly (CPN 653-2255-0XX) modification process. (a) Inspect Transmitter assembly REV letter. 1 . If transmitter assembly is REV N or earlier, proceed to step 3.A.(7).(b). 2 . If transmitter assembly is REV P through REV AG, proceed to step 3.A.(7).(d). 3 . If transmitter assembly is REV AH or later, proceed to step 3.B. (b) Refer to Figure 5. Locate, remove and discard connectors J11 and J12. (c) Install new connectors (CPN 859-6700-010) in same location. (d) Refer to Figure 5. Locate and remove Modulator Circuit Card Assembly Cover. (e) Install new Modulator Circuit Card Assembly Cover (CPN 653-1328-002) in same location. (f) Refer to Figure 5. Install new Synthesizer Shield (CPN 653-2283-002). N OT E : The Synthesizer Shield is not a replacement and will be placed over the existing shield. (g) Refer to Figure 6. If the MOD chart is not already on the Transmitter Assembly (CPN 653-2255-0XX), cut the word MOD and five squares from the modification chart (CPN 280-3778-050). Remove protective backing and apply MOD chart to transmitter assembly approximately as shown (h) Use permanent ink and mark SB "507". (8) Proceed to step 3.A.(13). (9) Modification process for CPN 622-9210-008/308/309 and CPN 622-9352-008/308/309. (a) If CPN is 622-9210-008/308 or 622-9352-008/308, proceed to step 3.A.(10). (b) If CPN is 622-9210-309 or 622-9352- 309, proceed to step 3.A.(12). (10) Refer to the disassembly instructions in the Disassembly section of the referenced component maintenance manual (with illustrated parts list). Disassemble the unit as required to remove the Main Chassis Assembly (CPN 653-2254-XXX).

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# Service Bulleti **n**

(11) CPU I/O Programmed Circuit Card A5 (CPN 653-3674-015/016/021/022) programming procedure. (a) Install Boardsite Profile (CPN 613-6608-111) into the Boardsite working directory using the import command from the FILE menu option. Do not copy the files within DOS, as this will erase the catalog in the working directory. Specify the drive and directory where the profile exists (either floppy drive or a directory other than the working directory). Import the board profile CPN 613-6608-111. (b) Install the Program Data (Page 0: CPN 829-8884-111, Page 1: CPN 832-3615-111, Page 2: CPN 815-7871-111) into the Boardsite working directory using the TRANSLATE command from the COMMUNICATIONS menu option. Follow the steps below to translate and combine the three Program Data files into one Boardsite programming file. 1 . Select COMMUNICATIONS from menu. 2 . Select TRANSLATE from menu. 3 . Select ASCII for conversion from ASCII to Boardsite. 4 . Enter location and data file name for Page 0 DOS ASCII FILE SOURCE. 5 . Enter Boardsite name: 831-6270-111. 6 . Enter 200 for offset. 7 . Enter RETURN for offset hi. 8 . Enter 200 for begin address. 9 . Enter 2FE00 for block size. 1 0 . Select INTEL MCS-86 HEX OBJ for the I/O format. 1 1 . Enter FF for fill byte. 1 2 . Press ALT-B to begin. 1 3 . After translation of Page 0 is complete, press any key to return to the translate menu. 1 4 . Select ASCII for conversion from ASCII to Boardsite. 1 5 . Enter location and data file name of Page 1 DOS ASCII FILE SOURCE. 1 6 . Enter Boardsite name: 831-6270-111. 1 7 . Enter 200 for offset. 1 8 . Enter RETURN for offset hi. 1 9 . Enter 10200 for begin address. 2 0 . Enter FE00 for block size. 2 1 . Select INTEL MCS-86 HEX OBJ for the I/O format. 2 2 . Enter FF for fill byte.
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# Service Bulleti **n**

2 3 . Press ALT-B to begin. 2 4 . Press "Y" to merge this file with the previous file. 2 5 . After translation of Page 1 is complete, press any key to return to the translate menu. 2 6 . Select ASCII for conversion from ASCII to Boardsite. 2 7 . Enter location and data file name of Page 2 DOS ASCII FILE SOURCE. 2 8 . Enter Boardsite name: 831-6270-111. 2 9 . Enter 200 for offset. 3 0 . Enter RETURN for offset hi. 3 1 . Enter 20200 for begin address. 3 2 . Enter FE00 for block size. 3 3 . Select INTEL MCS-86 HEX OBJ for the I/O format. 34 . Enter FF for fill byte. 3 5 . Press ALT-B to begin. 3 6 . Press "Y" to merge this file with the previous file. (c) Once the Profile and Program Data have been installed in the Boardsite working directory, the CPU I/O Circuit Card A5 may be programmed as follows. 1 . Install the CPU I/O Circuit Card on the Boardsite Interface Adapter (CPN 685-6400-002 or equivalent). 2 . Press ESC key. 3 . Select the COPY command. 4 . Select 613-6608-111 circuit card profile. 5 . Select the DISK file source. 6 . Select 831-6270-111. 7 . Press ALT_B to begin. N OT E : Programming procedure will take approximately 1 minute. (d) Ensure that the programming operation completes with no errors as indicated on the screen. The Boardsite will return a checksum of 01CC5FEA and a 32 bit CRC of AD022568. (e) Mark a new label (CPN 280-3847-040) with CPN 831-6270-111. (f) Remove existing label from programmed assembly (CPN 831-6270-XXX) and replace it with the label marked in step 3.A.(11)(e).

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# Service Bulleti **n**

(12) Video Processor Circuit Card A6 (CPN 687-0726-004/005/006/007) modification procedure. (a) Refer to Figure 1. Locate and remove video processor circuit card A6 (CPN 687-0726-004/005/006/007). (b) Refer to Figure 2. Locate, remove and discard jumper W1. (c) Refer to Figure 2. Install new 470 pF capacitor C1 (CPN 913-3667-230) as shown. (d) Refer to Figure 3. If the MOD chart is not already on the Video Processor Circuit Card A6 (CPN 687-0726-004/005/006/007), cut the word MOD and five squares from the modification chart (CPN 280-3778-050). Remove protective backing and apply MOD chart approximately as shown. (e) Use permanent ink and mark SB "507". (13) Refer to Figure 4. If the MOD chart is not already on the Main Chassis Assembly (CPN 653-2254-XXX), cut the word MOD and five squares from the modification chart (CPN 280-3778-050). Remove protective backing and apply MOD chart to approximately as shown (14) Use permanent ink and mark SB "507". (15) Proceed to step 3.B. B. Testing Procedure Test the unit in accordance with the test procedures in the Maintenance section of the referenced component maintenance manual (with illustrated parts list). C. Identification Procedure N OT E : The identification procedure must be accomplished in order for the service bulletin to be complete. N OT E : Refer to All Avionics Services Information Letter 05-2, titled “Clarification and Information on Usage and Ordering of Collins Nameplates and Modifications Plates” for information on ordering nameplates.

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# Service Bulleti **n**

(1) If identification plate on unit being modified is a laser etched two piece bar-coded plate, order new bar-coded identification plate based on the new unit part number as listed in the following table. Otherwise, proceed to step 3.C.(3).
**OLD UNIT CPN NEW UNIT CPN ID PLATE CPN**

622-9210-007 622-9210-008 622-9210-207 622-9210-308 622-9210-309 622-9210-409 685-2613-028 or 685-2613-034 (Preferred)

622-9352-007 622-9352-008 622-9352-207 622-9352-308 622-9352-309 622-9352-409 685-2622-030 or 685-2622-040 (Preferred) (2) Mark weight from existing identification plate onto new identification plate CPN 685-2613-XXX or CPN 685-2622-XXX. Proceed to step 3.C.(5). (3) If identification plate on the unit being modified is a stamped one piece plate, order new stamped identification plate based on the new unit part number as listed in the following table.
**OLD UNIT CPN NEW UNIT CPN ID PLATE CPN**

622-9210-007 622-9210-008 622-9210-207 622-9210-308 622-9210-309 622-9210-409 685-2613-029

622-9352-007 622-9352-008 622-9352-207 622-9352-308 622-9352-309 622-9352-409 685-2622-031

(4) Mark new identification plate CPN 685-2613-XXX or 685-2622-XXX with weight, serial number, and any previously marked service bulletins from existing identification plate.

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# Service Bulleti **n**

(5) Mark new identification plate, CPN 685-2613-XXX or 685-2622-XXX, with new unit part number following 622-9352- or 622-9210-, as listed below. The new unit part number is identification of the installation of this service bulletin. Do not mark out Service Bulletin "507".
**OLD ROCKWELL COLLINS**

**PART NUMBER ENDING NEW ROCKWELL COLLINS**  **PART NUMBER ENDING** -007/008/207/308/309 -409 (6) Remove existing identification plate from the unit and replace it with the new identification plate marked in previous step. N OT E : Refer to All Avionics Service Information Letter 3-03, titled "Disposal of Retired TSO Nameplates" for disposal of old unit identification plates. (7) Due to the change of the part number of this unit, the customer must be notified of the change by including the following statement, with the appropriate part numbers on the repair work sheet. "This unit was received with a part number of CPN 622-9352-007/008/207/308/309 for TDR-94 or CPN 622-9210-007/008/207/308/309 for TDR-94D and has been modified to a unit with a part number of CPN 622-9352-409 for TDR-94 or CPN 622-9210-409 for TDR-94D (refer to Service Bulletin "507"). Installation of units modified in accordance with Service Bulletin "507" may require a change to the aircraft TC/STC data unless the new part number is already included in the data." N OT E : Installation of SB "507" is indicated by the Top Level CPN on the nameplate. SB "507" is NOT marked on the product modification plate.

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# Service Bulleti **n**

Main Chassis Assembly (CPN 653-2254-XXX), Video Processor Circuit Card A6 And CPU I/O Programmed Circuit Card A5 Location Figure 1
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# Service Bulleti **n**

Video Processor Circuit Card A6 (CPN 687-0726-004/005/006/007), Partial Component Location Diagram Figure 2
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# Service Bulleti **n**

Video Processor Circuit Card A6 (CPN 687-0726-004/005/006/007), Modification Chart Location Diagram Figure 3
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# Service Bulleti **n**

Main Chassis Assembly (CPN 653-2254-XXX), Modification Chart Location Diagram Figure 4
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# Service Bulleti **n**

Transmitter Assembly (CPN 653-2255-0XX), Modification Diagram Figure 5
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# Service Bulleti **n**

Transmitter Assembly (CPN 653-2255-0XX), Modification Chart Location Diagram Figure 6
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# Service Bulleti **n**

Video Processor Circuit Card A6 (CPN 687-0726-004/005/006/007), Partial Schematic Diagram Figure 7
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