Loss of the input bus from the SDAC 1 to the DMC 1

TASK 31-63-00-810-926-A
Loss of the input bus from the SDAC 1 to the DMC 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 315404
AMM 31-60-00-740-002	Perform Electronic Instrument System (EIS) Input Test
AMM 31-60-00-740-007	GROUND SCANNING Test of the DMC
AMM 31-63-34-000-001	Removal of the DMC
AMM 31-63-34-400-001	Installation of the DMC

3. Fault Confirmation
Subtask 31-63-00-865-158-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	SDAC/1/SPLY	3WV	F04

Subtask 31-63-00-740-262-A ** ON A/C NOT FOR ALL

B. Test
Do the EIS input test (EIS 1) AMM 31-60-00-740-002.

Subtask 31-63-00-740-262-B ** ON A/C NOT FOR ALL

B. Test
Do the Ground Scanning Test of the DMC AMM 31-60-00-740-007.

4. Fault Isolation
Subtask 31-63-00-810-174-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message:
DMC 1 : NO SDAC1 DATA

(1) If the fault continues:

do a check and repair the wiring from the DMC 1 (1WT1) pins AA/10C, 10D to the first terminal block , ASM 315404.

Subtask 31-63-00-810-174-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message:
SDAC1(1WV1)/DMC1(1WT1)

(1) If the fault continues:

do a check and repair the wiring from the DMC 1 (1WT1) pins AD/6G, 6H to the first terminal block , ASM 315404.

Subtask 31-63-00-740-263-A

B. Do the test given in Para. 3.B.

[Rev.8 from Aug 2018] 2026.04.04 04:30:46 UTC