- replace the DMC-3 (1WT3) (Ref. AMM TASK 31-63-34-000-001) and (Ref. AMM TASK 31-63-34-400-001)
 (a) If the fault continues:
 - check the wiring between the DMC3 and the Lower ECAM DU (4WT2) (Ref. ASM 31-61/00)
 1 if the wiring is correct:
_

 - replace the DU-ECAM, LOWER (4WT2) (Ref. AMM TASK 31-63-22-000-001) and (Ref. AMM TASK 31-63-22-400-001)
 B. Do the test given in Para. 3.

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

 - DMC-2 (1WT2)

 - DMC-3 (1WT3)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
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 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 BUS DATA TO NDFO
 - replace the ND-F/O (3WT2) (Ref. AMM TASK 31-63-22-000-001) and (Ref. AMM TASK 31-63-22-400-001)
 (a) If the fault continues:
 - check the wiring between the DMC2 and the FO ND DU (3WT2) (Ref. ASM 31-61/00)
 1 if the wiring is correct:
_

 - replace the DMC-2 (1WT2) (Ref. AMM TASK 31-63-34-000-001) and (Ref. AMM TASK 31-63-34-400-001)

 (2) the maintenance message DU ND FO(3WT2)/WRG: DMC3 BUS DATA TO NDFO
 - replace the ND-F/O (3WT2) (Ref. AMM TASK 31-63-22-000-001) and (Ref. AMM TASK 31-63-22-400-001)
 (a) If the fault continues:
 - check the wiring between the DMC3 and the FO ND DU (3WT2) (Ref. ASM 31-61/00)
 1 if the wiring is correct:
_

 - 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 detected by the Upper ECAM DU
 1. Possible Causes
_______________
 - DU-ECAM, UPPER (4WT1)

 - DMC-1 (1WT1)

 - DMC-3 (1WT3)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
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 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 EWD (4WT1)/WRG: DMC1 BUS DATA TO EWD
 - replace the DU-ECAM, UPPER (4WT1) (Ref. AMM TASK 31-63-22-000-001) and (Ref. AMM TASK 31-63-22-400-001)
 (a) If the fault continues:
 - check the wiring between the DMC1 and the Upper ECAM DU (4WT1) (Ref. ASM 31-61/00)
 1 if the wiring is correct:
_

 - replace the DMC-1 (1WT1) (Ref. AMM TASK 31-63-34-000-001) and (Ref. AMM TASK 31-63-34-400-001)

 (2) the maintenance message DU EWD (4WT1)/WRG: DMC3 BUS DATA TO EWD
 - replace the DU-ECAM, UPPER (4WT1) (Ref. AMM TASK 31-63-22-000-001) and (Ref. AMM TASK 31-63-22-400-001)
 (a) If the fault continues:
 - check the wiring between the DMC3 and the Upper ECAM DU (4WT1) (Ref. ASM 31-61/00)
 1 if the wiring is correct:
_

 - 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 detected by the Lower ECAM DU
　
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