A. Put the aircraft back to its initial configuration.
 (1) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.

 (2) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002)

 「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 : 001-049, 051-099, 101-149, 151-199, ∞∞24-40-00∞∞∞∞∞∞∞∞∞∞Page 204
 201-299, 301-399, Aug 01/05 CES

 TASK 24-40-00-810-803

 Failure of the External Power Receptacle
 1. Possible Causes
_______________
 - GPCU (1XG)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R AMM 24-41-00-740-002 Operational Test of the Ground power Control Unit (GPCU) AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the APU AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied
 from the APU AMM 24-41-34-000-001 Removal of the Ground Power Control Unit (GPCU) (1XG) AMM 24-41-34-400-001 Installation of the Ground Power Control Unit (GPCU)
 (1XG)
 ASM 24-41/01

 3. Fault Confirmation
__________________
 A. Job Set-Up
 (1) Aircraft Maintenance Configuration
 (a) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002)
 B. Test Do the Operational Test of the GPCU (Ref. AMM TASK 24-41-00-740-002)
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message CHECK GPCU PINS C3, C4 RECEPTACLE 20XG PINS F, E and on the overhead panel, on the panel 35VU, the AVAIL legend of the EXT PWR pushbutton switch is on:
 - do a check of the status of the 3A circuit breaker on the front face of the GPCU:
 「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 : 001-049, 051-099, 101-149, 151-199, ∞∞24-40-00∞∞∞∞∞∞∞∞∞∞Page 205
 201-299, 301-399, Aug 01/05 CES (1) If the circuit breaker is open:

 - close it.
 (a) If the circuit breaker trips:
 - do a check of the wiring for short to ground between the pin C/4 of the GPCU and the pin F of the external power receptacle (Ref. ASM 24-41/01).
 1 If the wiring is not correct:
_ - repair it.
 2 If the wiring is correct:
_
 - replace the GPCU (1XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref. AMM TASK 24-41-34-400-001).
 (2) If the circuit breaker is closed:
 - do a check of the wiring for open circuit between the pin C/4 of the GPCU and the pin F of the external power receptacle (Ref. ASM 24-41/01).
 (a) If the wiring is not correct:

 - repair it.

 (b) If the wiring is correct:

 - replace the external power unit.

 (c) If the fault continues:

 - replace the GPCU (1XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref. AMM TASK 24-41-34-400-001).
 B. Make sure that the aircraft electrical circuits operate correctly in ground configuration.
 (1) Energize the aircraft electrical circuits from the external power (Ref. AMM TASK 24-41-00-861-002).

 (2) De- energize the aircraft electrical circuits from the external power (Ref. AMM TASK 24-41-00-862-002).

 5. Close-up
________
 A. Put the aircraft back to its initial configuration.
 (1) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.

 (2) De-energize the aircraft electrical circuits
 (Ref. AMM TASK 24-41-00-862-002)

 「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 : 001-049, 051-099, 101-149, 151-199, ∞∞24-40-00∞∞∞∞∞∞∞∞∞∞Page 206
 201-299, 301-399, Aug 01/05 CES TASK 24-40-00-810-804

 Failure of the External Ground Power Source
 1. Possible Causes
_______________
 - GPCU (1XG)

 - feeder wiring

 - wiring
　
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