Loss of the TR 1 VOLTAGE Input of the SDAC 2

TASK 31-54-00-810-878-A
Loss of the TR 1 VOLTAGE Input of the SDAC 2

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 243202
AMM 31-50-00-710-001	Ground Scanning of the Central Warning System
AMM 31-55-34-000-001	Removal of the SDAC
AMM 31-55-34-400-001	Installation of the SDAC

3. Fault Confirmation
Subtask 31-54-00-865-106-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
123VU	TR1/SPLY	2PU1	AB10

Subtask 31-54-00-710-192-A

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

4. Fault Isolation
Subtask 31-54-00-810-127-A

A. If the test gives the maintenance message SDAC 2 : NO TR 1 VOLTAGE 1PU1:

(1) If the fault continues:

do a check and repair the wiring from the SDAC 2 (1WV2) pin AB/6K to the first terminal block , ASM 243202.

Subtask 31-54-00-710-193-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:30:28 UTC