R (2) If the external power does not energize the electrical circuits:
R - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref.
R AMM TASK 24-41-34-400-001).
R (a) If the fault continues:
R - do the trouble shooting given in Para. 4.B.
R B. If the external power does not energize the electrical circuits:
R - do a check of the status of the GND/PWR/PROT circuit breaker (2XG).
R (1) If the circuit breaker is open:
R - close it.
R (a) If the circuit breaker trips:
R - do a check and repair the Point-Of-Regulation (POR) sense
R wiring of the external power (Ref. ASM 24-41/01) for a short to
R ground or short circuit between:
R . pin A2 of the GND/PWR/PROT circuit breaker (2XG) and pin
R B/15J of the GAPCU
R . pin B2 of the GND/PWR/PROT circuit breaker and pin B/14J of
R the GAPCU
R . pin C2 of the GND/PWR/PROT circuit breaker and pin B/13J of
R the GAPCU.
R (2) If the GND/PWR/PROT circuit breaker (2XG) is closed:
R - do a check of the Point-Of-Regulation (POR) sense wiring (Ref. ASM
R 24-41/01) for an open circuit or a short circuit between:
R . pin A/J of the EPC (3XG) and pin B/15J of the GAPCU
R . pin A/H of the EPC and pin B/14J of the GAPCU
R . pin A/G of the EPC and pin B/13J of the GAPCU.
R (a) If the wiring is not correct:
R - repair or replace as necessary.
R (b) If the wiring is correct:
R - do a check of the external power feeders (Ref. ASM 24-41/01)
R for an open circuit, a short circuit or a short to airframe
R between:
R . pin A of the external power receptacle (20XG) and pin A/K of
R the EPC (3XG)
R . pin B of the external power receptacle and pin A/L of the EPC
R . pin C of the external power receptacle and pin A/M of the
R EPC.
R 1 If the feeders are not correct:_
R - repair or replace as necessary.
R 2 If the feeders are correct:_
R - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001)
R and (Ref. AMM TASK 24-41-34-400-001).
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R C. Do this procedure to make sure that the system operates correctly.
R (1) Energize the aircraft electrical circuits from the external power R (Ref. AMM TASK 24-41-00-861-002).
R (2) De-energize the aircraft electrical circuits from the external power R (Ref. AMM TASK 24-41-00-862-002).
R TASK 24-41-00-810-815
R Failure of the Fault Light Circuit of the APU Generator R 1. Possible Causes
_______________
R - GAPCU (24XG)
R - BOARD-ANN LT TEST & INTFC (10LP)
R - wiring
R 2. Job Set-up Information
______________________
R A. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R AMM 24-41-00-740-002 R AMM 24-41-34-000-001 R R AMM 24-41-34-400-001 R R AMM 33-14-33-000-001 R R R AMM 33-14-33-400-001 R R R ASM 24-22/02 R ASM 24-23/02
R 3. Fault Confirmation
__________________
R A. Test
Operational Check of GAPCU via CFDS
Removal of the Ground Auxiliary Power Control Unit
(GAPCU) (24XG)
Installation of the Ground Auxiliary Power Control
Unit (GAPCU) (24XG)
Removal of the Annunciator-Light Test and
Interface-Board (1LP, 2LP, 3LP, 4LP, 5LP, 6LP, 7LP,
8LP, 9LP, 10LP, 11LP, 12LP, 18LP, 19LP, 20LP)
Installation of the Annunciator-Light Test and
Interface-Board (1LP, 2LP, 3LP, 4LP, 5LP, 6LP, 7LP,
8LP, 9LP, 10LP, 11LP, 12LP, 18LP, 19LP, 20LP)
R (1) Read the Class 3 Faults of the GAPCU (Ref. AMM TASK 24-41-00-740-R 002). 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 电源 3(102)
