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_
 - Replace the RELAY-EPC AUX CTL (5XG).
 3 If the fault continues:
_
 - Do a check of the wiring between pins B/10 and B/12 of the GLC1 and of the GLC2.
 a If there is no continuity:
_
 - Replace the GLC-1 (9XU1) and/or GLC-2 (9XU2) (Ref. AMM TASK 24-22-55-000-001) and (Ref. AMM TASK 24-22-55-400-002).
 b If there is continuity:
_
 - Do a check and repair the wiring between pin B/3 of the EPC (3XG) and pin A/D2 of the EPC auxiliary control relay (5XG) (Ref. ASM 24-41/01).
 (b) If there is no 28VDC:
 - Do a check and repair the wiring between pins A/D1 and A/X1 of the EPC auxiliary control relay (5XG) and the circuit breaker (11XG) (Ref. ASM 24-41/01).
 B. Do the procedure given in Para 3.A.
 「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 : ALL ∞∞24-41-00∞∞∞∞∞∞∞∞∞∞Page 213
 Feb 01/99R CES

R **ON A/C 401-499,

R TASK 24-41-00-810-810 R Failure of the Ground Auxiliary Power Control Unit R 1. Possible Causes
_______________ R - GAPCU (24XG) R 2. Job Set-up Information
______________________
R A. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R  AMM  24-41-00-740-002  Operational Check of GAPCU via CFDS 
R  AMM  24-41-34-000-001  Removal of the Ground Auxiliary Power Control Unit 
R  (GAPCU) (24XG) 
R  AMM  24-41-34-400-001  Installation of the Ground Auxiliary Power Control 
R  Unit (GAPCU) (24XG) 
R  3. Fault Confirmation__________________ 
R  A. Test 

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 - stop the trouble shooting. 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. Do the test given in para. 3.

 「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 : 401-499, ∞∞24-41-00∞∞∞∞∞∞∞∞∞∞Page 214
 Aug 01/05 CES

R TASK 24-41-00-810-811

R Failure of the Interlock Circuit (External Power / GAPCU) R 1. Possible Causes
_______________
R - GAPCU (24XG) R - external power-source cable R - external power source R - wiring
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 ASM 24-41/01
R 3. Fault Confirmation
__________________
R A. Test
R Not applicable.

R 4. Fault Isolation

_______________ 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 A. If the fault symptom is identified by the CFDS messages EXT PWR INTLK/
R GAPCU (24XG) or EXTERNAL POWER INTERLOCK/ GAPCU (24XG):
R - do a check of the DC voltage between pin E and pin F of the external
R power-source plug to make sure that it is not out of the limits,
R - do a check for a short circuit between the wiring of pins E or F and
R the external power-source cables.

R (1) If the DC voltage is out of the limits:
R - repair or replace the external power-source cable or the external
R power source as necessary.

R (2) If the DC voltage is not out of the limits:
R - do a check of the wiring (Ref. ASM 24-41/01) for an out-of-limit AC
R or DC voltage between:

R . pin E of the external power receptacle (20XG) and pin B/11E of R the GAPCU
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 401-499, ∞∞24-41-00∞∞∞∞∞∞∞∞∞∞Page 215
　
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