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TASK 77-30-00-810-832
Loss of the EVMU Output Bus
1. Possible Causes
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- EVMU (2EV)
- wiring from the EVMU (2EV) pins AA/13A, 13C to the first terminal block
2. Job Set-up Information
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A. Referenced Information
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REFERENCE DESIGNATION
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AMM 31-50-00-710-001 Ground Scanning of the Central Warning System AMM 77-32-34-000-042 Removal of the Engine Vibration Monitoring Unit (EVMU) AMM 77-32-34-400-042 Installation of the Engine Vibration Monitoring Unit (EVMU) ASM 77-32/02
3. Fault Confirmation
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A. Make sure that this(these) circuit breaker(s) is(are) closed:
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PANEL DESIGNATION IDENT. LOCATION
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121VU ENGINE/ENG1 AND 2/EVMU 1EV R44
B. Do the operational test of the Central Warning Systems (SDAC) (Ref. AMM TASK 31-50-00-710-001).
4. Fault Isolation
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A. If the test gives the maintenance message SDAC2 : NO DATA FROM EVMU:
- replace the EVMU (2EV) (Ref. AMM TASK 77-32-34-000-042) and (Ref. AMM TASK 77-32-34-400-042).
(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).
B. Do the test given in Para. 3.
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