Failure of the SDAC 1 A320
1. Possible Causes:
-SDAC-1 (1WV1)
-C/B-SDAC/1/SPLY (3WV)
-wiring from the SDAC 1 (1WV1) pin AC/1 to the circuit breaker (3WV)
2. Job Set-up Information
A.Referenced Information
| REFERENCE | DESIGNATION |
| Ref. AMM 31-50-00-710-001 | Ground Scanning of the Central Warning System |
| Ref. ASM 31-51-01 | |
| Ref. AMM 31-55-34-000-001 | Removal of the SDAC |
| Ref. AMM 31-55-34-400-001 | Installation of the SDAC |
3. Fault Confirmation
SUBTASK 31-54-00-710-068-A
A. Test
Do the ground scanning of the central warning systems (FWC) Ref. AMM 31-50-00-710-001.
4. Fault Isolation
SUBTASK 31-54-00-865-142-A
A. Table of the circuit breakers used in this procedure:
| PANEL | DESIGNATION | FIN | LOCATION |
| 49VU | SDAC/1/SPLY | 3WV | F04 |
B. If the test gives the maintenance message:
SDAC1
— do a check of the status of the circuit breaker (3WV).
(1) If the circuit breaker (3WV) is closed:
— replace the SDAC-1 (1WV1), Ref. AMM 31-55-34-000-001 and Ref. AMM 31-55-34-400-001.
(a) If the fault continues:
— do a check of the wiring from the SDAC 1 (1WV1) pin AC/1 to the circuit breaker (3WV), Ref. ASM 31-51-01.
1 If there is no continuity:
— repair the wiring given above.
2 If there is continuity:
— replace the C/B-SDAC/1/SPLY (3WV).
(2) If the circuit breaker (3WV) is open:
— close the circuit breaker.
(a) If the circuit breaker is open again:
— replace the SDAC-1 (1WV1).
1 If the fault continues:
— do a check and repair for a short to ground the wiring between the circuit breaker (3WV) and the SDAC 1 (1WV1).
(b) If the circuit breaker stays closed and the fault continues:
— replace the SDAC-1 (1WV1).
SUBTASK 31-54-00-710-069-A
C.Do the test given in Para. 3.
