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

 - DMC-2 (1WT2)

 - 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 (1WT2)
 - check the wiring between the DMC2 and 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-2 (1WT2) (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.
 「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, ∞∞31-63-81∞∞∞∞∞∞∞∞∞∞Page C207
 Aug 01/05 CES Failure of the A629 BUS from the Upper ECAM DU to the DMC2

 1. Possible Causes
_______________
 - DU-ECAM, UPPER (4WT1)

 - DMC-2 (1WT2)

 - 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
 (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 DMC1 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 EWD(4WT1)/WRG: DMC1 (1WT1)

 - do the relative fault isolation procedure (Ref. TASK 31-63-81-810-964)

 (2) the maintenance message DU EWD(4WT1)/WRG: DMC2 (1WT2)

 - check the wiring between the DMC2 and the Upper ECAM DU (4WT1) (Ref. ASM 31-61/00)
 (a) if the wiring is correct:

 - replace the DU-ECAM, UPPER (4WT1) (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-2 (1WT2) (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 Lower ECAM DU to the DMC2
 1. Possible Causes
_______________
 - DU-ECAM, LOWER (4WT2)

 - DMC-2 (1WT2)

 - 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)
　
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