(2) Do the operational test of the CVR and the CVR channel recording (Ref. AMM TASK 23-71-00-710-001) only if the fault causes inhibition of the audio signal related to the CVR.
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(3) Do the operational test of the GPWS ground self-test function (Ref. AMM TASK 34-48-00-710-001) only if the fault causes inhibition of the audio signal related to the GPWS.
(4) Do the BITE test of the TCAS (Ref. AMM TASK 34-43-00-740-001) only if the fault causes inhibition of the audio signal related to the TCAS.
4. Fault Isolation
_______________
A. Table of the circuit breakers used in this procedure:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
121VU AUDIO MIXING 14WW K03 121VU EIS/F/O/LOUD/SPKR 4WW P08
B. If the fault causes inhibition of all the aural warnings:
- do a check of the status of the circuit breaker (4WW).
- do a check of the status of the circuit breaker (14WW).
(1) if the circuit breaker (14WW) is closed:
- do a check for 28VDC at pin A/L of the audio mixing box (15WW) (Ref. ASM 31-51/01):
(a) if there is 28VDC:
- replace the audio mixing box (15WW) (Ref. AMM TASK 31-53-33-000-001) and (Ref. AMM TASK 31-53-33-400-001).
(b) if there is no 28VDC:
- do a check for 28VDC at the circuit breaker (14WW):
1 if there is 28VDC:
_
- do a check and repair the wiring from the circuit breaker (14WW) to the audio mixing box (15WW).
2 if there is no 28VDC:
_
- replace AUDIO MIXING (14WW).
(2) if the circuit breaker (14WW) is open:
- close the circuit breaker (14WW).
(a) if the circuit breaker trips:
- replace the AUDIO MIXING (14WW).
1 if the circuit breaker trips again
_
- replace the audio mixing box (15WW) (Ref. AMM TASK 31-53-33-000-001) and (Ref. AMM TASK 31-53-33-400-001).
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(3) If the circuit breaker (4WW) is closed:
- do a check for 28VDC at pin A/A of the loud speaker (7WW) (Ref. ASM 31-51/01).
(a) If there is 28VDC:
- do a check for a ground signal at pins A/B and A/T of the loud speaker (7WW).
1 If there is a ground signal:
_
- replace the LOUD SPEAKER-CAPT (7WW) (Ref. AMM TASK 31-53-21-000-001) and (Ref. AMM TASK 31-53-21-400-001).
a If the fault continues:
_
- replace the FWC-1 (1WW1) (Ref. AMM TASK 31-53-34-000-001) and (Ref. AMM TASK 31-53-34-400-001). . If the fault continues:
- replace the FWC-2 (1WW2) (Ref. AMM TASK 31-53-34-000-001) and (Ref. AMM TASK 31-53-34-400-001).
* If the fault continues:
- do a check and repair the wiring: ** of the AUDIO OUT signal from the FWC1 (1WW1) to the loud speaker (7WW) ** of the AUDIO OUT signal from the FWC2 (1WW2) to the loud speaker (7WW) (Ref. ASM 31-52/04).
2 If there is no ground signal:
_
- do a check and repair the wiring of pins A/B and A/T from the loud speaker (7WW) to the first terminal block (Ref. ASM 31-51/01).
(b) If there is no 28VDC:
- do a check for 28VDC at pin 2 of the circuit breaker (5WW) (Ref. ASM 31-51/01).
1 If there is 28VDC:
_
- do a check and repair the wiring from the circuit breaker (5WW) to the loud speaker (7WW) (Ref. ASM 31-51/01).
2 If there is no 28VDC:
_
- replace the C/B - CAPT/LOUD/SPKR (5WW).
(4) If the circuit breaker is open:
- close the circuit breaker.
(a) If the circuit breaker trips:
- replace the C/B - CAPT/LOUD/SPKR (5WW).
1 If the circuit breaker trips again:
_
- replace the LOUD SPEAKER-CAPT (7WW) (Ref. AMM TASK 31-53-21-000-001) and (Ref. AMM TASK 31-53-21-400-001).
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本文鏈接地址：A320 Trouble Shooting Manual 排故手冊 指示和記錄系統 1(164)
