3. Fault Confirmation
__________________
 A. Test
 (1) Energize the aircraft electrical circuits from the external power (Ref. AMM TASK 24-41-00-861-002).
 NOTE : Energization of the aircraft is correct but, during the
____ procedure given at Para. 3.E. and 3.F., make sure that:
 「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 ∞∞24-40-00∞∞∞∞∞∞∞∞∞∞Page 225
 Aug 01/05 CES

 - on the ELEC panel 35VU, the AVAIL legend of the EXT PWR pushbutton switch stays on.
 4. Fault Isolation
_______________
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 A. If the test confirms the fault:
 - do a check for 28VDC at pins B/3, B/5 of the EPC (3XG) (Ref. ASM 24-41/01).
 (1) If there is 28VDC:

 - replace the EPC (3XG) (Ref. AMM TASK 24-41-55-000-001) and (Ref. AMM TASK 24-41-55-400-001).

 (2) If there is not 28VDC:

 - do a check for ground signal at the pin A/X2 of the EPC AUX CTL relay (Ref. ASM 24-41/01).
 (a) If there is a ground signal:
 - replace the RELAY-EPC AUX CTL (5XG).
 1 If the fault continues:
_
 - replace the GLC-APU (3XS) (Ref. AMM TASK 24-23-55-000-001) and (Ref. AMM TASK 24-23-55-400-001).
 2 If the fault continues:
_
 - do a check and repair the wiring . from the pin B/5 of the EPC to the first terminal block (Ref. ASM 24-41/01). . from the pin B/3 of the EPC to the pin A/C1 of the EPC AUX CTL relay (Ref. ASM 24-41/01). . from the pin A/C2 of the relay to the first terminal block (Ref. ASM 24-23/02).
 (b) If there is no ground signal:
 - replace the EGIU-1 (22XU1) (Ref. AMM TASK 24-22-33-000-001) and (Ref. AMM TASK 24-22-33-400-002).
 1 If the fault continues:
_
 - do a check and repair the wiring from the pin AB/3C of the EGIU1 (22XU1) to the pin A/X2 of the EPC AUX CTL relay (Ref. ASM 24-41/01).

R **ON A/C 401-499,

R  A. If the test confirms the fault: 
R  - do a check for 28VDC at pins B/3 and B/5 of the EPC (3XG) (Ref. ASM 24-
R  41/01). 
R  (1) If there is 28VDC: 
R  - replace the EPC (3XG) (Ref. AMM TASK 24-41-55-000-001) and (Ref. 
R  AMM TASK 24-41-55-400-001). 
R  (2) If there is not 28VDC: 
R  - do a check for a ground signal at the pin A/X2 of the EPC auxiliary 
R  control relay (5XG) (Ref. ASM 24-41/01). 
R  (a) If there is a ground signal: 
R  - replace the RELAY-EPC AUX CTL (5XG). 
R  1 If the fault continues:_ 
R  - replace the GLC-APU (3XS) (Ref. AMM TASK 24-23-55-000-001) 
R  and (Ref. AMM TASK 24-23-55-400-001). 
R  2 If the fault continues:_ 
R  - do a check and repair the wiring between: 
R  . the pin B/5 of the EPC (3XG) and the first terminal block 
R  (Ref. ASM 24-41/01) 
R  . the pin B/3 of the EPC and the pin A/C1 of the EPC 
R  auxiliary control relay (5XG) (Ref. ASM 24-41/01) 
R  . the pin A/C2 of the EPC auxiliary control relay and the 
R  first terminal block (Ref. ASM 24-23/02). 
R  (b) If there is no ground signal: 
R  - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) and 
R  (Ref. AMM TASK 24-41-34-400-001). 
R  1 If the fault continues:_ 
R  - do a check and repair the wiring between the pin AB/10A of 
R  the GAPCU (24XG) and the pin A/X2 of the EPC auxiliary 
R  control relay (5XG) (Ref. ASM 24-41/01). 
R  **ON A/C ALL

 B. Do this test to make sure that the system operates correctly:
 (1) Do the test given in Para. 3. and make sure that: - on the panel 35VU, when you push the EXT PWR pushbutton switch:

 - the AVAIL legend goes off

 - the ON legend comes on.

 (2) De-energize the aircraft electrical circuits from the external power (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 : ALL ∞∞24-40-00∞∞∞∞∞∞∞∞∞∞Page 227
 Aug 01/05 CES TASK 24-40-00-810-812

 External Power not Available although the External Power Energizes the Aircraft
 1. Possible Causes
_______________
 - GPCU (1XG) R - GAPCU (24XG)
 2. Job Set-up Information
　
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