2 If the circuit breaker opens again:
_ - replace the circuit breaker (5RN).
 a If the fault continues:
_
 - do a check and repair the wiring (from First Officer ACP (2RN2) pin A/M and from AMU (1RN) pin AC/4 to the first terminal block) (Ref. ASM 23-51/03)

 - install the removed LRUs: . (Ref. AMM TASK 23-51-12-400-001) for the ACP-F/O (2RN2) . (Ref. AMM TASK 23-51-34-000-001) for the AMU (1RN).

 (b) If the circuit breaker stays closed:
 - replace the First Officer ACP (2RN2) and the AMU (1RN) one by one until the fault is no longer there: . (Ref. AMM TASK 23-51-12-000-001) and (Ref. AMM TASK 23-51-12-400-001) for the ACP-F/O (2RN2) . (Ref. AMM TASK 23-51-34-000-001) and (Ref. AMM TASK 23-51-34-400-001) for the AMU (1RN).
 C. Do the test given in Para. 3.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞23-51-00∞∞∞∞∞∞∞∞∞∞Page 230
 Aug 01/01R
 CES

 TASK 23-51-00-810-820

 Loss of the Power Supply of the ACP 3 and AMU Card 3
 1. Possible Causes
_______________
 - ACP-3RD OCCPNT (2RN3)

 - AMU (1RN)

 - C/B-CTL PNL THIRD OCCPNT (6RN)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 23-51-00-740-002 BITE Test of the Audio System 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) ASM 23-51/04
 3. Fault Confirmation
__________________
 A. Test Do the BITE test of the AMU-ACP (Ref. AMM TASK 23-51-00-740-002).
 4. Fault Isolation
_______________
 A. Table of the circuit breakers used in this procedure:
 -------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------
R 121VU COM NAV/ACP/THIRD/OCCPNT 6RN M02
 B. If the BITE test gives the two maintenance messages AUDIO, NO DATA FROM ACP3 and AUDIO MANAGEMENT UNIT:
 - do a check of the circuit breaker (6RN) status.
 (1) If the circuit breaker is closed:
 - replace the C/B-CTL PNL THIRD OCCPNT (6RN).
 (a) If the fault continues:
 - do a check and repair the wiring from the circuit breaker (6RN) to the first terminal block (Ref. ASM 23-51/04).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞23-51-00∞∞∞∞∞∞∞∞∞∞Page 231
 Feb 01/02 CES (2) If the circuit breaker is open:

 - close it.
 (a) If it opens again:
 - remove the ACP-3RD OCCPNT (2RN3) (Ref. AMM TASK 23-51-12-000-001)

 - remove the AMU (1RN) (Ref. AMM TASK 23-51-34-000-001)

 - close the circuit breaker (6RN).

 1_ If the circuit breaker stays closed:
 - install the removed LRUs one by one until the circuit
 breaker (6RN) opens again:
 . (Ref. AMM TASK 23-51-12-400-001) for the ACP-3RD OCCPNT
 (2RN3)
 . (Ref. AMM TASK 23-51-34-000-001) for the AMU (1RN).
 - replace the faulty LRU.

 2 If the circuit breaker opens again:
_ - replace the circuit breaker (6RN).
 a If the fault continues:
_
 - do a check and repair the wiring (from Third Occupant ACP (2RN3) pin A/M and from AMU (1RN) pin AC/5 to the first terminal block) (Ref. ASM 23-51/04)

 - install the removed LRUs: . (Ref. AMM TASK 23-51-12-400-001) for the ACP-3RD OCCPNT (2RN3) . (Ref. AMM TASK 23-51-34-000-001) for the AMU (1RN).

 (b) If the circuit breaker stays closed:
 - replace the Third Occupant ACP (2RN3) and the AMU (1RN) one by one until the fault is no longer there: . (Ref. AMM TASK 23-51-12-000-001) and (Ref. AMM TASK 23-51-12-400-001) for the ACP-3RD OCCPNT (2RN3) . (Ref. AMM TASK 23-51-34-000-001) and (Ref. AMM TASK 23-51-34-400-001) for the AMU (1RN).
 C. Do the test given in Para. 3.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞23-51-00∞∞∞∞∞∞∞∞∞∞Page 232
　
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