Loss of the High Speed Bus Output from the DMC 3 (DMC 1 Switched to DMC 3) Detected by the FWC 1

TASK 31-63-00-810-816-A
Loss of the High Speed Bus Output from the DMC 3 (DMC 1 Switched to DMC 3) Detected by the FWC 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-50-00-710-001	Ground Scanning of the Central Warning System
ASM 316103
AMM 31-63-34-000-001	Removal of the DMC
AMM 31-63-34-400-001	Installation of the DMC
ASM 316805

3. Fault Confirmation
Subtask 31-63-00-710-066-A ** ON A/C NOT FOR ALL

A. Test
Do the operational test of the central warning systems (FWC) AMM 31-50-00-710-001.

4. Fault Isolation
Subtask 31-63-00-810-058-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message FWC1 : NO DATA FROM DMC 1 OR 3:

(1) If the fault continues:

do a check of the wiring from the DMC 1 (1WT1) pins AB/1E, 1F to the first terminal block ASM 316103.

(a) If there is no continuity:

(b) If there is continuity:

do a check and repair the wiring between the DMC 3 (1WT3) and the DMC 1 (1WT1) from pins AB/1E, 1F to pins AA/13E, 13F ASM 316805.

Subtask 31-63-00-710-067-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:37 UTC