W DOC AIRBUS | TSM A320F

Failure of the Power Supply of the Clock

TASK 31-21-00-810-802-A
Failure of the Power Supply of the Clock

1. Possible Causes
  • CLOCK [2FS]
  • wiring
  • C/B-CLOCK/NORM/SPLY [6FS]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
ASM 312101
AMM 31-21-21-000-001
Removal of the Clock
AMM 31-21-21-400-001
Installation of the Clock
3. Fault Confirmation
Subtask 31-21-00-740-052-A
A. Test
Not applicable, the fault is evident.
4. Fault Isolation
Subtask 31-21-00-810-051-A
A. When the displays go off:
  • do a check of the status of the circuit breaker (6FS).
   (1) If the circuit breaker (6FS) is closed:
     (a) If the fault continues:
  • do a check of the wiring from the clock (2FS) pin A/V to the circuit breaker (6FS) , ASM 312101.
       1 If there is no continuity:
  • repair the wiring.
       2 If there is continuity:
  • replace the C/B-CLOCK/NORM/SPLY [6FS] .
   (2) If the circuit breaker (6FS) is open:
  • close the circuit breaker.
     (a) If the circuit breaker trips:
  • replace the CLOCK [2FS] .
       1 If the fault continues:
  • do a check and repair for a short to ground the wiring between the circuit breaker (6FS) and the clock (2FS).
     (b) If the circuit breaker stays closed and the fault continues:
  • replace the CLOCK [2FS] .
[Rev.8 from Aug 2018] 2026.04.04 04:29:48 UTC
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