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 1_ If the wiring is not correct:
R - repair or replace as necessary.

R 2_ If the wiring is correct:
R - replace the C/B-GND/PWR/PROT (2XG).

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 Aug 01/05 CES

R  (2) If the 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 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). 
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 24-41-00-810-813
R Failure of the Interlock Signal of the External Power
R 1. Possible Causes
_______________
R - RCPT-EXT PWR (20XG) R - GAPCU (24XG) R - external power R - external power plug 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 AMM 24-41-51-000-001 R AMM 24-41-51-400-001 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) Removal of the External Power Receptacle (20XG) Installation of the External Power Receptacle (20XG)
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:
R - stop the external power source,
R - disconnect the plug from the external power receptacle (20XG),
R - make sure that the ELEC/EXT PWR pushbutton switch (10XG) is in the ON
R position,
R - do a check of the external power plug for a short to 28VDC of the pin
R F.

R (1) If there is a short to 28VDC:
R - repair or replace the external power plug.

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 Aug 01/05 CES

R (2) If there is no short to 28VDC:
R - do a check of the wiring of the external-power interlock control
R (Ref. ASM 24-41/01) for a short to 28VDC or a short circuit
R between:

R . pin F and pin E of the external power receptacle (20XG)

R . pin B/12E of the GAPCU and pin F of the external power receptacle R (20XG).
　
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