Failure of A629 BUS from the DMC's to the F/O ND DU

TASK 31-63-81-810-954-A
Failure of A629 BUS from the DMC's to the F/O ND DU

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-60-00-720-002	Operational Test of the DMC/DU data bus
ASM 316104
AMM 31-63-22-000-001	Removal of the Display Unit
AMM 31-63-22-400-001	Installation of the Display Unit
AMM 31-63-34-000-001	Removal of the DMC
AMM 31-63-34-400-001	Installation of the DMC

3. Fault Confirmation
Subtask 31-63-81-720-050-A ** ON A/C NOT FOR ALL

A. Test
Do the operational test of the DMC/DU Data Bus AMM 31-60-00-720-002.

4. Fault Isolation
Subtask 31-63-81-810-236-A ** ON A/C NOT FOR ALL

A. If the test gives:
(1) the maintenance message DMC2(1WT2)/WRG: DMC2 BUS DATA TO ND FO

(a) If the fault continues:

1 if the wiring is correct:

(2) the maintenance message DMC3(1WT3)/WRG: DMC3 BUS DATA TO ND FO

(a) If the fault continues:

1 if the wiring is correct:

Subtask 31-63-81-720-051-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:31:08 UTC