W DOC AIRBUS | TSM A320F

Loss of the Power Supply of the ACP 1 and AMU Card 1

TASK 23-51-00-810-818-A
Loss of the Power Supply of the ACP 1 and AMU Card 1

1. Possible Causes
  • C/B-COM/AUDIO/ACP/CAPT or C/B-ACP CAPT SELCAL INT 1 AUDIO AVNCS [4RN]
  • wiring
  • ACP-CAPT [2RN1]
  • AMU [1RN]
  • RELAY-SUPLY TRANSFER [68RN]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 23-51-00-740-002
BITE Test of the Audio System
ASM 235102
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 23-51-00-740-084-A
A. Test
Do the BITE test of the Audio System AMM 23-51-00-740-002.
4. Fault Isolation
Subtask 23-51-00-865-053-A
A. Table of the circuit breakers used in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUCOM/AUDIO/ACP/CAPT4RNG06
** ON A/C NOT FOR ALL
49VUACP CAPT SELCAL INT 1 AUDIO AVNCS4RNG06
Subtask 23-51-00-810-067-B ** ON A/C NOT FOR ALL
B. If the BITE test gives the two maintenance messages ACP1(2RN1)/AMU(1RN) and AMU(1RN):
  • Do a check of the circuit breaker C/B-COM/AUDIO/ACP/CAPT or C/B-ACP CAPT SELCAL INT 1 AUDIO AVNCS [4RN] status.
   (1) If the circuit breaker is closed:
  • Replace the C/B-COM/AUDIO/ACP/CAPT or C/B-ACP CAPT SELCAL INT 1 AUDIO AVNCS [4RN] .
     (a) If the fault continues:
  • Do a check and repair the wiring between the circuit breaker C/B-COM/AUDIO/ACP/CAPT or C/B-ACP CAPT SELCAL INT 1 AUDIO AVNCS [4RN] and the first terminal block ASM 235102.
   (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/CAPT or C/B-ACP CAPT SELCAL INT 1 AUDIO AVNCS [4RN] opens again:
    . AMM 23-51-12-400-001 for the ACP-CAPT [2RN1]
    . 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/CAPT or C/B-ACP CAPT SELCAL INT 1 AUDIO AVNCS [4RN] .
         a If the fault continues:
     (b) If the circuit breaker stays closed:
Subtask 23-51-00-810-067-C ** ON A/C NOT FOR ALL
B. If the BITE test gives the two maintenance messages ACP1(2RN1)/AMU(1RN) and AMU(1RN):
  • Replace the RELAY-SUPLY TRANSFER [68RN]
   (1) If the fault continues:
  • Do a check of the circuit breaker C/B-ACP CAPT SELCAL INT 1 AUDIO AVNCS [4RN] status.
   (2) If the circuit breaker is closed:
  • Replace the circuit breaker C/B-ACP CAPT SELCAL INT 1 AUDIO AVNCS [4RN] .
     (a) If the fault continues:
  • Do a check and repair the wiring from the circuit breaker C/B-ACP CAPT SELCAL INT 1 AUDIO AVNCS [4RN] to the AMU [1RN] pin AC/1 ASM 235102.
   (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 CAPT SELCAL INT 1 AUDIO AVNCS [4RN] .
         a If the fault continues:
  • Do a check and repair the wiring from :
    . ACP-CAPT [2RN1] pin A/M to AMU [1RN] pin AA/7G
    . AMU [1RN] pin AC/1 to RELAY-SUPLY TRANSFER [68RN] pin A/B2
    . RELAY-SUPLY TRANSFER [68RN] pin A/B3 to pin A/A2
    . RELAY-SUPLY TRANSFER [68RN] pin A/A3 to circuit breaker C/B-ACP CAPT SELCAL INT 1 AUDIO AVNCS [4RN] .
  • Install the removed LRUs:
    . AMM 23-51-12-400-001 for the ACP-CAPT [2RN1]
    . AMM 23-51-34-000-001 for the AMU [1RN] .
     (b) If the circuit breaker stays closed:
Subtask 23-51-00-740-085-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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