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 GCU-2 (1XU2) (Ref. AMM TASK 24-22-34-000-001) and (Ref. 
R  AMM TASK 24-22-34-400-001). 
R  C. Do the test given in para. 3.

R TASK 24-20-00-810-934 R Failure of the GCU 1 POR Wiring R 1. Possible Causes
_______________
R - GCU-1 (1XU1) R - wiring R 2. Job Set-up Information
______________________
R A. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R AMM 24-22-34-000-001 R AMM 24-22-34-400-001 R AMM 24-41-00-740-002 R AMM 24-41-00-861-002 R R AMM 24-41-00-862-002 R R AMM 31-60-00-860-001 R AMM 31-60-00-860-002 R AMM 71-00-00-710-003 R AMM 71-00-00-710-028 R ASM 24-22/01
R 3. Fault Confirmation
__________________
R A. Test
R Not applicable.

Removal of the GCU-1(2) (1XU1, 1XU2) Installation of the GCU-1(2) (1XU1, 1XU2) Operational Check of GAPCU via CFDS Energize the Aircraft Electrical Circuits from the External Power De-energize the Aircraft Electrical Circuits Supplied from the External Power EIS Start Procedure EIS Stop Procedure Engine Automatic Start Engine Shutdown
R NOTE : As the GEN 1 was set to OFF because of a true failure, the fault
____ R confirmation is not necessary.
R 4. Fault Isolation
_______________
R A. If the fault symptom is identified by the CFDS message WRG: POR/ GCU1 R (1XU1) and the upper ECAM-DU warning GEN 1 FAULT: R - do a check of the Point-Of-Regulation (POR) sense wiring (Ref. ASM 24-R 22/01) for a short to ground, a short circuit or an open circuit R between:
R . terminal D of the GLC 1 and pin A/14G of the GCU 1 (phase A)

R . terminal E of the GLC 1 and pin A/15H of the GCU 1 (phase B)

R . terminal F of the GLC 1 and pin A/15G of the GCU 1 (phase C)

R . pin A/14H of the GCU 1 and ground.

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

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 401-499, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page C229
 Aug 01/05 CES

R (2) If the wiring is correct:
R - replace the GCU-1 (1XU1) (Ref. AMM TASK 24-22-34-000-001) and (Ref.
R AMM TASK 24-22-34-400-001).

R B. Do this operational test to make sure that the system operates correctly.

R (1) Aircraft Maintenance Configuration

R (a) Energize the aircraft electrical circuits
R (Ref. AMM TASK 24-41-00-861-002).
R (b) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
R (Ref. AMM TASK 31-60-00-860-001).
R (2) On the ELEC panel 35VU:

R - push, release and push again the GEN 1 pushbutton switch (3XU1).

R (3) Do the operational test of the GAPCU (Ref. AMM TASK 24-41-00-740-R 002).
R (4) Start the engine 1 (Ref. AMM TASK 71-00-00-710-003).
R (5) Do this test:
R -------------------------------------------------------------------------------
R ACTION RESULT

R -------------------------------------------------------------------------------
R R R R  On the ECAM control panel: - get the ELEC page.  On the lower ECAM DU: - the correct electrical parameters of the GEN 1 are shown and the AC1 busbar is supplied by the GEN 1. 
R  5. Close-up________ 

R A. Put the aircraft back to its initial configuration.
R (1) Stop the engine 1 (Ref. AMM TASK 71-00-00-710-028).
R (2) Do the EIS stop procedure

R (Ref. AMM TASK 31-60-00-860-002).

R (3) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY R potentiometers to OFF. R (4) De-energize the aircraft electrical circuits
R (Ref. AMM TASK 24-41-00-862-002).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 401-499, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page C230
 Aug 01/05 CESR TASK 24-20-00-810-935 R Failure of the GCU 2 POR Wiring R 1. Possible Causes

_______________
R - GCU-1 (1XU1) R - wiring R 2. Job Set-up Information
______________________
R A. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
　
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