R (a) If the check is not correct:
R - repair or replace the wiring as necessary
R - replace the RCPT-EXT PWR (20XG) (Ref. AMM TASK 24-41-51-000-R 001) and (Ref. AMM TASK 24-41-51-400-001) as necessary
R - energize the aircraft electrical circuits from the external
R power (Ref. AMM TASK 24-41-00-861-002).

R (b) If the check is correct:
R - energize the aircraft electrical circuits from the external
R power (Ref. AMM TASK 24-41-00-861-002).

R 1_ If the external power energizes the electrical circuits:
R - stop the trouble shooting.

R 2_ If the external power does not energize the electrical
R circuits:
R - do the trouble shooting given in Para. 4B.

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.

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 401-499, ∞∞24-41-00∞∞∞∞∞∞∞∞∞∞Page 221
 Aug 01/05 CES

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). 
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 24-41-00-810-814

R  Failure of the External Power and of the POR Sense Wiring of the GAPCU 
R  1. Possible Causes_______________ 
R  - GAPCU (24XG) 
R  - external power 
R  - wiring 
R  - feeders 
R  2. Job Set-up Information______________________ 
R  A. Referenced Information 
R  -------------------------------------------------------------------------------
R  REFERENCE  DESIGNATION 
R  -------------------------------------------------------------------------------

R  AMM  24-41-00-861-002 
R 
R  AMM  24-41-00-862-002 
R 
R  AMM  24-41-34-000-001 
R 
R  AMM  24-41-34-400-001 
R 
R  ASM  24-41/01 

R 3. Fault Confirmation
__________________ R A. Test
Energize the Aircraft Electrical Circuits from the External Power De-energize the Aircraft Electrical Circuits Supplied from the External Power Removal of the Ground Auxiliary Power Control Unit (GAPCU) (24XG) Installation of the Ground Auxiliary Power Control Unit (GAPCU) (24XG)
R  (1) Energize the aircraft electrical circuits from the external power 
R  (Ref. AMM TASK 24-41-00-861-002). 
R  4. Fault Isolation_______________ 
R  A. If the test confirms the fault: 
　
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