- replace the DMC-3 (1WT3) (Ref. AMM TASK 31-63-34-000-001) and (Ref. AMM TASK 31-63-34-400-001)
 B. Do the test given in Para. 3.

 Failure of the A629 BUS from the FO PFD DU to the DMC3
 1. Possible Causes
_______________
 - PFD-F/O (2WT2)

 - DMC-3 (1WT3)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
31-63-81-810-968 Failure of the A629 BUS from the FO PFD DU to the
 DMC2 AMM 31-60-00-720-002 Operational Test of the DMC/DU data bus 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) AMM 31-63-34-000-001 Removal of the DMC (1WT1,1WT2,1WT3) AMM 31-63-34-400-001 Installation of the DMC (1WT1,1WT2,1WT3) ASM 31-61/00
 3. Fault Confirmation
__________________
 A. Test
 (1) Make sure that the DMC2 is correctly installed (Ref. AMM TASK 31-63-34-400-001)

 (2) Do the operational test of the DMC/DU Data Bus (Ref. AMM TASK 31-60-00-720-002)

 4. Fault Isolation
_______________
 A. If the test gives:
 (1) the maintenance message DU PFD FO(2WT2)/WRG: DMC2(1WT2)

 - do the relative fault isolation procedure (Ref. TASK 31-63-81-810-968)

 (2) the maintenance message DU PFD FO(2WT2)/WRG: DMC3(1WT3)

 - check the wiring between the DMC3 and the FO PFD DU (2WT2) (Ref. ASM 31-61/00)
 (a) if the wiring is correct:

 - replace the PFD-F/O (2WT2) (Ref. AMM TASK 31-63-22-000-001) and (Ref. AMM TASK 31-63-22-400-001)

 (b) If the fault continues:

 - replace the DMC-3 (1WT3) (Ref. AMM TASK 31-63-34-000-001) and (Ref. AMM TASK 31-63-34-400-001)
 B. Do the test given in Para. 3.

 Failure of the A629 BUS from the FO ND DU to the DMC3
 1. Possible Causes
_______________
 - ND-F/O (3WT2)

 - DMC-3 (1WT3)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
31-63-81-810-969 Failure of the A629 BUS from the FO ND to the DMC2 AMM 31-60-00-720-002 Operational Test of the DMC/DU data bus 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) AMM 31-63-34-000-001 Removal of the DMC (1WT1,1WT2,1WT3) AMM 31-63-34-400-001 Installation of the DMC (1WT1,1WT2,1WT3) ASM 31-61/00
 3. Fault Confirmation
__________________
 A. Test
 (1) Make sure that the DMC2 is correctly installed (Ref. AMM TASK 31-63-34-400-001)

 (2) Do the operational test of the DMC/DU Data Bus (Ref. AMM TASK 31-60-00-720-002)

 4. Fault Isolation
_______________
 A. If the test gives:
 (1) the maintenance message DU ND FO(3WT2)/WRG: DMC2(1WT2)

 - do the relative fault isolation procedure (Ref. TASK 31-63-81-810-969)

 (2) the maintenance message DU ND FO(3WT2)/WRG: DMC3(1WT3)

 - check the wiring from the DMC3 to the FO ND DU (3WT2) (Ref. ASM 31-61/00)
 (a) if the wiring is correct:

 - replace the ND-F/O (3WT2) (Ref. AMM TASK 31-63-22-000-001) and (Ref. AMM TASK 31-63-22-400-001)

 (b) If the fault continues:

 - replace the DMC-3 (1WT3) (Ref. AMM TASK 31-63-34-000-001) and (Ref. AMM TASK 31-63-34-400-001)
 B. Do the test given in Para. 3.

 Failure of the A629 BUS from the Upper ECAM DU to the DMC3
 1. Possible Causes
_______________
 - DU-ECAM, UPPER (4WT1)

 - DMC-3 (1WT3)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
31-63-81-810-964 Failure of the A629 BUS from the Upper ECAM DU to the
 DMC1 AMM 31-60-00-720-002 Operational Test of the DMC/DU data bus 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
　
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