DOC AIRBUS | TSM A320FLoss of the EVMU Output Bus
TASK 77-30-00-810-832-A
Loss of the EVMU Output Bus
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 77-30-00-865-052-A ** ON A/C NOT FOR ALL
Subtask 77-30-00-810-077-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:37:47 UTC
Loss of the EVMU Output Bus
1. Possible Causes
- EVMU [2EV]
wiring from the EVMU (2EV) pins AA/13A, 13C to the first terminal block
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 31-50-00-710-001 | Ground Scanning of the Central Warning System |
| ASM 773202 | |
| AMM 77-32-34-000-040 | Removal of the Monitoring Unit Engine Vibration (EVMU) |
| AMM 77-32-34-000-042 | Removal of the Engine Vibration Monitoring Unit (EVMU) |
| AMM 77-32-34-400-040 | Installation of the Vibration Monitoring Unit (EVMU) |
| AMM 77-32-34-400-042 | Installation of the Engine Vibration Monitoring Unit (EVMU) |
Subtask 77-30-00-865-052-A ** ON A/C NOT FOR ALL
A. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 77-30-00-710-097-A ** ON A/C NOT FOR ALL 4. Fault Isolation| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | ENGINE/ENG1 AND 2/EVMU | 1EV | R44 |
Subtask 77-30-00-810-077-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message SDAC2 : NO DATA FROM EVMU:
Subtask 77-30-00-810-077-B ** ON A/C NOT FOR ALL - replace the EVMU [2EV] AMM 77-32-34-000-040 and AMM 77-32-34-400-040.
- do a check and repair the
wiring from the EVMU (2EV) pins AA/13A, 13C to the first terminal block ASM 773202.
A. If the test gives the maintenance message SDAC2 : NO DATA FROM EVMU:
Subtask 77-30-00-710-098-A ** ON A/C NOT FOR ALL - replace the EVMU [2EV] AMM 77-32-34-000-042 and AMM 77-32-34-400-042.
- do a check and repair the
wiring from the EVMU (2EV) pins AA/13A, 13C to the first terminal block ASM 773202.
B. Do the test given in Para. 3.