Loss of the Output Buses 1+2 of the Zone Temperature Controller by the SDAC 1

TASK 31-54-00-810-936-A
Loss of the Output Buses 1+2 of the Zone Temperature Controller by the SDAC 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 315403
AMM 31-55-34-000-001	Removal of the SDAC
AMM 31-55-34-400-001	Installation of the SDAC

3. Fault Confirmation
Subtask 31-54-00-865-133-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
122VU	AIR COND/ZONE TEMP CTL/28VDC/SYS2	4HK	V20
122VU	AIR COND/ZONE TEMP CTL/28VDC/SYS1	3HK	V19
122VU	AIR COND/ZONE TEMP CTL/115VAC/SYS2	2HK	V18
122VU	AIR COND/ZONE TEMP CTL/115VAC/SYS1	1HK	V17

Subtask 31-54-00-710-305-A

B. Test
Do the ground scanning of the central warning systems AMM 31-50-00-710-001.

4. Fault Isolation
Subtask 31-54-00-810-185-A

A. If the test gives the maintenance message SDAC 1 : NO DATA FROM ECS 1+2:

(1) If the fault continues:

do a check and repair as necessary the wiring from the SDAC 1 (1WV1)
. pins AB/14J, 14K to the first terminal block
. pins AE/14A, 14B to the first terminal block ASM 315403.

Subtask 31-54-00-710-306-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:33 UTC