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 it is not possible to connect the external power source to the
R aircraft electrical network and if the fault symptom is identified by the
R CFDS message WRG:EXT PWR PIN E INTERLOCK/ GAPCU (24XG):
R - do a check of the wiring of the external power interlock-control for an
R open circuit or a short circuit between the pin E and the cord plug of
R the external power source.

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

R (2) If the wiring is correct:
R - do a check of the wiring of the interlock control (Ref. ASM 24-R 41/01) for an open circuit, a short circuit or a short to ground
R between pin E of the external power receptacle (20XG) and pin B/11E
R of the GAPCU.

 「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 235
 Aug 01/05 CES

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  B. 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 24-41-00-810-820

R Failure of the Pin Programming of the GAPCU R 1. Possible Causes
_______________
R - GAPCU (24XG) 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 ASM 24-41/01
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)
R (1) Do the BITE test of the GAPCU (Ref. AMM TASK 24-41-00-740-002).
R (a) If the BITE test gives the message TEST FAILED: R - do the trouble shooting given in Para 4.A.
R (b) If the BITE test gives the message TEST PASSED: R - do the trouble shooting given in Para 4.B.
R 4. Fault Isolation
_______________
R A. If the BITE test gives the message TEST FAILED:
R - push the line key adjacent to the TEST FAILED message.

R (1) If the maintenance message GAPCU (24XG) comes into view:
R - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref.
R AMM TASK 24-41-34-400-001).

R B. If the BITE test gives the message TEST PASSED:
R - do a check of the pin programming wiring (Ref. ASM 24-41/01) of the
R GAPCU:

R . pin A/4G connected to ground

R . pins A/3E, A/5E and A/5A not connected.

 「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 237
 Aug 01/05 CES

R  NOTE : The wiring diagram of the aircraft interface with the pin____ 
R  programming connections is necessary to do the trouble shooting 
R  procedure. 
R  (1) If the wiring is not correct: 
R  - repair or replace as necessary. 
R  (2) If the wiring is correct: 
R  - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref. 
R  AMM TASK 24-41-34-400-001). 
R  C. Do the test given in para. 3.

R TASK 24-41-00-810-821 R Failure of the External Power POR-Wiring or Interlock Protection R 1. Possible Causes
_______________
R - RCPT-EXT PWR (20XG) R - GAPCU (24XG) R - wiring R - feeders R - external power
R 2. Job Set-up Information
　
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