W DOC AIRBUS | TSM A320F

Failure of the ON BAT Light on the ADIRS CDU

TASK 34-13-00-810-937-A
Failure of the ON BAT Light on the ADIRS CDU

1. Possible Causes
  • bulb
  • CDU-ADIRS [2FP]
  • wiring
  • FAULT LT-ADIRS/ON BAT (28FP)
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 33-14-00-710-001
Operational Test of the Lights
AMM 34-10-00-860-002
ADIRS Start Procedure
AMM 34-10-00-860-005
ADIRS Stop Procedure
ASM 341101
ASM 341102
AMM 34-12-12-000-001
Removal of the ADIRS CDU
AMM 34-12-12-400-001
Installation of the ADIRS CDU
3. Fault Confirmation
Subtask 34-13-00-710-152-A ** ON A/C NOT FOR ALL
A. Test
   (1) Do the ADIRS start procedure AMM 34-10-00-860-002.
NOTE: The ADIRS start procedure is correct but, during the procedure, at Para. 3.B., make sure that:
  • on the ADIRS CDU, the ON BAT light does not come on.
Subtask 34-13-00-710-152-B ** ON A/C NOT FOR ALL
A. Test
   (1) Do the ADIRS start procedure AMM 34-10-00-860-002.
NOTE: The ADIRS start procedure is correct but, during the procedure, at Para. 3.B., make sure that:
  • On the ADIRS MSU, the ON BAT light does not come on.
4. Fault Isolation
Subtask 34-13-00-810-187-A ** ON A/C NOT FOR ALL
A. If the test confirms the fault:
   (1) If the ON BAT light stays off:
  • replace the bulb .
     (a) If the fault continues:
   (2) If the ON BAT light comes on:
     (a) If the fault continues:
  • do a check and repair the wiring from pins A/16, B/16, C/16 of the ADIRS CDU (2FP) to the first terminal block ASM 341101.
Subtask 34-13-00-710-153-A ** ON A/C NOT FOR ALL
B. Make sure that the system operates correctly:
   (1) Do the action given in Para. 3. and make sure that:
  • on the ADIRS CDU, the ON BAT light comes on.
Subtask 34-13-00-810-187-B ** ON A/C NOT FOR ALL
C. If the test confirms the fault:
   (1) If the ON BAT light stays off:
  • Replace the bulb .
     (a) If the fault continues:
  • Replace the FAULT LT-ADIRS/ON BAT (28FP).
     (b) If the fault continues:
  • Do a check and repair the wiring of the ADIRS/ON BAT fault light (28FP):
    . From pin 2 to DIODE (2403VD) pin 1
    . From pin 2 to DIODE (2403VD) pin 2
    . From pin 2 to DIODE (2403VD) pin 4
    . From pin 2 to DIODE (2403VD) pin 5
    . From pin 4 to to the first terminal block ASM 341102.
Subtask 34-13-00-710-153-B ** ON A/C NOT FOR ALL
D. Make sure that the system operates correctly:
   (1) Do the procedure given in Para. 3. and make sure that:
  • On the ADIRS MSU, the ON BAT light comes on.
5. Close-up
Subtask 34-13-00-860-063-A
A. Do the ADIRS stop procedure AMM 34-10-00-860-005.
[Rev.8 from Aug 2018] 2026.04.04 04:32:29 UTC
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