W DOC AIRBUS | TSM A320F

Loss of the Power Supply of the ACP 2 and AMU Card 2

TASK 23-51-00-810-819-A
Loss of the Power Supply of the ACP 2 and AMU Card 2

1. Possible Causes
  • C/B-COM/AUDIO/ACP/F/O or C/B-ACP F/O BITE INT 2 AUDIO 3/5 OCCPNT [5RN]
  • wiring
  • ACP-F/O [2RN2]
  • AMU [1RN]
  • RELAY-SUPLY TRANSFER [69RN]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 23-51-00-740-002
BITE Test of the Audio System
ASM 235103
AMM 23-51-12-000-001
Removal of the Audio Control Panel (ACP) (2RN1, 2RN2, 2RN3, 2RN4, 2RN5)
AMM 23-51-12-400-001
Installation of the Audio Control Panel (ACP) (2RN1, 2RN2, 2RN3, 2RN4, 2RN5)
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)
3. Fault Confirmation
Subtask 23-51-00-740-086-A
A. Test
Do the BITE test of the Audio System AMM 23-51-00-740-002.
4. Fault Isolation
Subtask 23-51-00-865-054-A
A. Table of the circuit breakers used in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUCOM/AUDIO/ACP/F/O5RNG07
** ON A/C NOT FOR ALL
49VUACP F/O BITE INT 2 AUDIO 3/5 OCCPNT5RNG07
Subtask 23-51-00-810-068-B ** ON A/C NOT FOR ALL
B. If the BITE test gives the two maintenance messages ACP2(2RN2)/AMU(1RN) and AMU(1RN):
  • Do a check of the circuit breaker C/B-COM/AUDIO/ACP/F/O or C/B-ACP F/O BITE INT 2 AUDIO 3/5 OCCPNT [5RN] status.
   (1) If the circuit breaker is closed:
  • Replace the C/B-COM/AUDIO/ACP/F/O or C/B-ACP F/O BITE INT 2 AUDIO 3/5 OCCPNT [5RN] .
     (a) If the fault continues:
  • Do a check and repair the wiring from the circuit breaker C/B-COM/AUDIO/ACP/F/O or C/B-ACP F/O BITE INT 2 AUDIO 3/5 OCCPNT [5RN] to the first terminal block ASM 235103.
   (2) If the circuit breaker is open:
  • Close it.
     (a) If it opens again:
       1 If the circuit breaker stays closed:
  • Install the removed LRUs one by one until the circuit breaker C/B-COM/AUDIO/ACP/F/O or C/B-ACP F/O BITE INT 2 AUDIO 3/5 OCCPNT [5RN] opens again:
    . AMM 23-51-12-400-001 for the ACP-F/O [2RN2]
    . AMM 23-51-34-000-001 for the AMU [1RN]
  • Replace the faulty LRU.
       2 If the circuit breaker opens again:
  • Replace the circuit breaker C/B-COM/AUDIO/ACP/F/O or C/B-ACP F/O BITE INT 2 AUDIO 3/5 OCCPNT [5RN] .
         a If the fault continues:
     (b) If the circuit breaker stays closed:
Subtask 23-51-00-810-068-C ** ON A/C NOT FOR ALL
B. If the BITE test gives the two maintenance messages ACP2(2RN2)/AMU(1RN) and AMU(1RN):
  • Replace the RELAY-SUPLY TRANSFER [69RN]
   (1) If the fault continues:
  • Do a check of the circuit breaker C/B-ACP F/O BITE INT 2 AUDIO 3/5 OCCPNT [5RN] status.
   (2) If the circuit breaker is closed:
  • Replace the circuit breaker C/B-ACP F/O BITE INT 2 AUDIO 3/5 OCCPNT [5RN] .
     (a) If the fault continues:
  • Do a check and repair the wiring from the circuit breaker C/B-ACP F/O BITE INT 2 AUDIO 3/5 OCCPNT [5RN] to the first terminal block ASM 235103.
   (3) If the circuit breaker is open:
  • Close it.
     (a) If it opens again:
       1 If the circuit breaker stays closed:
       2 If the circuit breaker opens again:
  • Replace the circuit breaker C/B-ACP F/O BITE INT 2 AUDIO 3/5 OCCPNT [5RN] .
         a If the fault continues:
  • Do a check and repair the wiring from :
    . ACP-F/O [2RN2] pin A/M to the circuit breaker C/B-ACP F/O BITE INT 2 AUDIO 3/5 OCCPNT [5RN]
    . AMU [1RN] pin AC/4 to the RELAY-SUPLY TRANSFER [69RN] pin A/B2
    . RELAY-SUPLY TRANSFER [69RN] pin A/B3 to pin A/A2
    . RELAY-SUPLY TRANSFER [69RN] pin A/A3 to the circuit breaker C/B-ACP F/O BITE INT 2 AUDIO 3/5 OCCPNT [5RN]
  • Install the removed LRUs:
    . AMM 23-51-12-400-001 for the ACP-F/O [2RN2]
    . AMM 23-51-34-000-001 for the AMU [1RN] .
     (b) If the circuit breaker stays closed:
Subtask 23-51-00-740-087-A
C. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:25:44 UTC
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