(a) If the wiring is correct, replace the POT-ND, CAPT (8WT1).

 5. Close-up
________
 A. CLose-up
 - Do the EIS Stop Procedure (Ref. AMM TASK 31-60-00-860-002).

 Blank Screen on the FO PFD DU
 1. Possible Causes
_______________
 - PFD-F/O (2WT2)

 - EIS/PFD/F/O (11WT2)

 - EIS/PFD/F/O/SWTG (22WT2)

 - POT-PFD, F/O (7WT2)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 31-60-00-860-001 EIS Start Procedure AMM 31-60-00-860-002 EIS Stop Procedure AMM 31-63-22-000-001 Removal of the Display Unit
 (2WT1,2WT2,3WT1,3WT2,4WT1,4WT2) AMM 31-63-22-400-001 Installation of the Display Unit
 (2WT1,2WT2,3WT1,3WT2,4WT1,4WT2) ASM 31-61/01 ASM 31-61/02
 3. Fault Confirmation
__________________
 A. Job Set-up
 (1) Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).
 4. Fault Isolation
_______________
 A. If the operational image is shown on the FO PFD DU:
 - no maintenance action is necessary.
 B. If a maintenance message is shown on a black screen
 - do the fault isolation procedure relative to this message.

 C. If a blank screen is shown on the FO PFD DU:
 - replace the PFD-F/O (2WT2) (Ref. AMM TASK 31-63-22-000-001) and (Ref. AMM TASK 31-63-22-400-001).
 (1) If the fault continues:
 (a) Do a check for 115VAC at pin AA-79 of the FO PFD DU (Ref. ASM 31-61/02)
 1 If there is no 115VAC:
_

 - check the wiring from the PFD FO SPLY-C/B (11WT2) to the FO PFD-DU(2WT2) pin AA-79 (Ref. ASM 31-61/01)
 a If there is no continuity:
_ - repair the wiring

 b If there is continuity:
_

 - replace the EIS/PFD/F/O (11WT2).
 2 If there is 115VAC:
_

 - do a check for a ground signal at pin A-77 of the FO PFD DU
 a If there is no ground signal:
_

 - check and repair the wiring from the FO PFD-DU pin AA-77 to the the ground terminal
 b If there is a ground signal:
_

 - do a check for 28VDC at the FO PFD-DU pin AA-81 . if there is no 28VDC, check and repair the wiring from the FO PFD-DU pin AA-81 to the FO PFD-SWTG C/B (22WT2) . if there is 28VDC, replace the EIS/PFD/F/O/SWTG (22WT2).
 (2) If the fault continues:
 - do a check for a ground signal at pin AA-75 of the FO PFD DU.
 (a) If there is a ground signal:
 - make sure there is no ground signal at pin 8 of the FO PFD potentiometer (7WT2)
 1 If there is no ground signal:
_

 - check and repair the wiring from the FO PFD-POT (7WT2) pin 8 to the FO PFD-DU (2WT2) pin AA-75.
 2 If there is a ground signal:
_ - replace the POT-PFD, F/O (7WT2).

 5. Close-up
________
 A. CLose-up
 - Do the EIS Stop Procedure (Ref. AMM TASK 31-60-00-860-002).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 401-499, ∞∞31-63-82∞∞∞∞∞∞∞∞∞∞Page 265
 Aug 01/05 CES Blank Screen on the FO ND DU

 1. Possible Causes
_______________
 - ND-F/O (3WT2)

 - EIS/ND/F/O (12WT2)

 - EIS/ND/F/O/SWTG (23WT2)

 - POT-ND, F/O (8WT2)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 31-60-00-860-001 EIS Start Procedure AMM 31-60-00-860-002 EIS Stop Procedure AMM 31-63-22-000-001 Removal of the Display Unit
 (2WT1,2WT2,3WT1,3WT2,4WT1,4WT2) AMM 31-63-22-400-001 Installation of the Display Unit
 (2WT1,2WT2,3WT1,3WT2,4WT1,4WT2) ASM 31-61/01 ASM 31-61/02
 3. Fault Confirmation
__________________
 A. Job Set-up
 (1) Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).
 4. Fault Isolation
_______________
 A. If the operational image is shown on the FO ND DU:
　
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