R 4. Fault Isolation

_______________
R A. If the test confirms the fault:
R - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref. AMM
R TASK 24-41-34-400-001).

 「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 : 401-499, ∞∞24-41-00∞∞∞∞∞∞∞∞∞∞Page 250
 Aug 01/05 CES

R  B. Table of the circuit breakers used in this procedure: 
R  -------------------------------------------------------------------------------
R  PANEL DESIGNATION IDENT. LOCATION 
R  -------------------------------------------------------------------------------
R  C/B NOT APPLICABLE 
R  C. If the test confirms the fault: 
R  - do a check of the PTC TRIP LED on the front face of the GAPCU. 
R  (1) If the PTC TRIP LED is off: 
R  - stop the trouble shooting. 
R  (2) If the PTC TRIP LED is on: 
R  - de-energize the aircraft electrical circuits from the external 
R  power (Ref. AMM TASK 24-41-00-862-002). 
R  - do a check of the wiring of the power ready signal for a short to 
R  ground or a short circuit between pin C/5 of the GAPCU and pin 1 of 
R  the ELEC/EXT PWR/COCKPIT/AVAIL/LT circuit breaker (12XG) (Ref. ASM 
R  24-41/01). 
R  (a) If the wiring is not correct: 
R  - repair or replace as necessary. 
R  (b) If the wiring is correct: 
R  - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) and 
R  (Ref. AMM TASK 24-41-34-400-001). 
R  D. 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 **ON A/C 106-149, 229-299, 303-399, 401-499,

 TASK 24-41-00-810-827
 Failure of the External Power Plug or Interlock Wiring
 1. Possible Causes
_______________
 - GAPCU (24XG)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power AMM 24-41-34-000-001 Removal of the Ground Auxiliary Power Control Unit (GAPCU) (24XG) AMM 24-41-34-400-001 Installation of the Ground Auxiliary Power Control Unit (GAPCU) (24XG) ASM 24-41/01
 3. Fault Confirmation
__________________
 A. Test
 (1) Energize the aircraft electrical circuits from the external power (Ref. AMM TASK 24-41-00-861-002).
 4. Fault Isolation
_______________
 A. If the external power does not energize the electrical circuits:
 - do a check of the external power plug for correct installation.
 (1) If the plug is not installed correctly:
 - stop the external power source

 - connect the external power plug to the receptacle (20XG)

 - energize the aircraft electrical circuits from the external power (Ref. AMM TASK 24-41-00-861-002).

 (a) If, on the EXT PWR panel 108VU, the EXT PWR/AVAIL caution light (9XG) and the EXT PWR/NOT IN USE indicator light (8XG) are on:

 - stop the trouble shooting.

 (b) If, on the EXT PWR panel 108VU, the EXT PWR/AVAIL caution light (9XG) and the EXT PWR/NOT IN USE indicator light (8XG) are off:

 - do a check of the wiring of the external power interlock-control for an open circuit or a short circuit between the pin E and the cord plug of the external power source.
 1 If the wiring is not correct:
_ - repair or replace as necessary.
 2 If the wiring is correct:
_
 - do a check of the wiring of the interlock control (Ref. ASM 24-41/01) for an open circuit, a short circuit or a short to ground between pin E of the external power receptacle (20XG) and pin B/11E of the GAPCU.
 a If the wiring is not correct:
　
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