DOC AIRBUS | TSM A320FLoss of the Output Bus on the EVMU
1. Possible Causes
· EVMU ( 2EV )
· wiring from the EVMU (2EV) pins AA/13A, 13C to the first terminal block
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 77-32-02
Ref. AMM 77-32-34-000-041 Removal of the Engine Vibration Monitoring Unit (EVMU)
Ref. AMM 77-32-34-400-041 Installation of the Engine Vibration Monitoring Unit (EVMU)
3. Fault Confirmation
Subtask 77-32-00-865-052-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
PANEL DESIGNATION FIN LOCATION
121VU ENGINE/ENG1 AND 2/EVMU 1EV R44
Subtask 77-32-00-710-064-A
B. Test
(1) Do the operational test of the Central Warning Systems (SDAC) Ref. AMM 31-50-00-710-001 .
4. Fault Isolation
Subtask 77-32-00-810-065-A
A. If the test gives the maintenance message SDAC2 : NO DATA FROM EVMU:
· replace the EVMU ( 2EV ) , Ref. AMM 77-32-34-000-041 and Ref. AMM 77-32-34-400-041 .
(1) If the fault continues:
· do a check and repair the wiring from the EVMU (2EV) pins AA/13A, 13C to the first terminal
block , Ref. ASM 77-32-02.
Subtask 77-32-00-710-065-A
B. Do the test given in Para. 3. [Rev.6 from Feb 2017] 2026.04.04 04:37:54 UTC