W DOC AIRBUS | TSM A320F

Failure of the Loud Speaker Card 1 Circuit

TASK 23-51-00-810-840-A
Failure of the Loud Speaker Card 1 Circuit

1. Possible Causes
  • C/B-CAPT/LOUD/SPKR [5WW]
  • LOUD SPEAKER-CAPT [7WW]
  • AMU [1RN]
  • POT-LOUD SPEAKER, CAPT [15RN1]
  • wiring
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 23-51-00-710-001
Operational Test of the Audio Management
ASM 235102
AIPC 235108
AMM 23-51-34-000-001
Removal of the Audio Management Unit (AMU) (1RN)
AMM 23-51-34-400-001
Installation of the Audio Management Unit (AMU) (1RN)
ASM 315101
AMM 31-53-21-000-001
Removal of the Loudspeakers
AMM 31-53-21-400-001
Installation of the Loudspeakers
3. Fault Confirmation
Subtask 23-51-00-710-084-A
A. Test
   (1) Do the operational test of the audio management system AMM 23-51-00-710-001.
4. Fault Isolation
Subtask 23-51-00-865-058-A
A. Table of the circuit breakers used in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUCAPT/LOUD/SPKR5WWF10
Subtask 23-51-00-810-089-A
B. If the loud speaker at the Captain station does not operate:
  • Do a check of the circuit breaker C/B-CAPT/LOUD/SPKR [5WW] status.
   (1) If the circuit breaker is closed:
  • Do a check for 28VDC at pin A/A of the LOUD SPEAKER-CAPT [7WW] ASM 315101.
     (a) If there is 28VDC:
       1 If the fault continues:
       2 If the fault continues:
       3 If the fault continues:
  • Do a check of the wiring from the AMU [1RN] pins AA/8J, 8H to the LOUD SPEAKER-CAPT [7WW] pins A/C, G ASM 235102.
         a If there is no continuity:
  • Repair the above wiring.
         b If there is continuity:
  • Do a check of the wiring from:
    . The AMU [1RN] pin AA/8G to the POT-LOUD SPEAKER, CAPT [15RN1] pin A/3
    . The LOUD SPEAKER-CAPT [7WW] pin A/F to the POT-LOUD SPEAKER, CAPT [15RN1] pin A/1
  • Repair the above faulty wiring.
     (b) If there is no 28VDC:
  • Do a check for a ground signal at pin A/B of the LOUD SPEAKER-CAPT [7WW] ASM 315101.
       1 If there is no ground signal:
  • Repair the wiring from the LOUD SPEAKER-CAPT [7WW] pin A/B to the ground terminal ASM 315101.
       2 If there is a ground signal:
  • Do a check of the wiring from the LOUD SPEAKER-CAPT [7WW] pin A/A to the circuit breaker C/B-CAPT/LOUD/SPKR [5WW] ASM 315101.
         a If there is no continuity:
  • Repair the above wiring.
         b If there is continuity:
  • Replace the circuit breaker C/B-CAPT/LOUD/SPKR [5WW] .
   (2) If the circuit breaker is open:
  • Close it.
     (a) If it opens again:
       1 If the fault continues:
  • Do a check for a short to ground at the wiring from the LOUD SPEAKER-CAPT [7WW] to the circuit breaker C/B-CAPT/LOUD/SPKR [5WW] ASM 315101.
         a If there is a short to ground:
  • Repair the above wiring.
         b If there is no short to ground:
  • Replace the circuit breaker C/B-CAPT/LOUD/SPKR [5WW] .
     (b) If the circuit breaker stays closed and the fault continues:
Subtask 23-51-00-710-085-A
C. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:25:46 UTC
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