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 4. Fault Isolation
_______________
 A. If the test gives the maintenance message CHECK SERIAL LINK GPCU TO GCU APU:
 - do a check of the wiring for open circuit or short to ground between respectively the APU GCU pins B/14C, B/14D and the GPCU pins A/14B, A/15B (Ref. ASM 24-41/02).
 (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).

 (3) If the fault continues:

 - replace the GCU-APU (1XS) (Ref. AMM TASK 24-23-34-000-001) and (Ref. AMM TASK 24-23-34-400-001).
 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 : 001-049, 051-099, 101-149, 151-199, ∞∞24-41-00∞∞∞∞∞∞∞∞∞∞Page 202
 201-299, 301-399, Aug 01/05 CES

 TASK 24-41-00-810-803

 Failure of the RS422 Electrical Connection between the GPCU and the APU GCU
 1. Possible Causes
_______________
 - GCU-APU (1XS)

 - GPCU (1XG)

 - wiring between the circuit breaker (6XS) and the APU GCU

 - C/B-ELEC/APU/GCU (6XS)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 24-23-34-000-001 Removal of the GCU-APU (1XS)
 AMM 24-23-34-400-001 Installation of the GCU-APU (1XS)
 AMM 24-41-00-740-002 Operational Test of the Ground power Control Unit

 (GPCU) 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 24-23/02
 ASM 24-41/02

 3. Fault Confirmation
__________________
 A. 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 NO DATA FROM GCU APU:
 - on the circuit breaker panel 122VU, do a check of the status of the circuit breaker (6XS).
 (1) If the circuit breaker is open:

 - close it.

 (2) If the circuit breaker is closed:

 - do a check for 28VDC on the pin A/1D of the APU GCU.
 (a) If there is no 28VDC:
 - do a check of the wiring between the circuit breaker (6XS) and the APU GCU (Ref. ASM 24-23/02).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞24-41-00∞∞∞∞∞∞∞∞∞∞Page 203
 201-299, 301-399, Aug 01/05 CES (b) If there is 28VDC:

 1_ If there is no continuity:
 - repair the above wiring.
 2_ If there is continuity:
 - replace the C/B-ELEC/APU/GCU (6XS).

 - do a check of the wiring between respectively the APU GCU pins B/14C, B/14D and the GPCU pins A/14B, A/15B (Ref. ASM 24-41/02).
 1 If there is no continuity:
_ - repair the above wiring.
 2 If there is continuity:
_
 - replace the GCU-APU (1XS) (Ref. AMM TASK 24-23-34-000-001) and (Ref. AMM TASK 24-23-34-400-001).
 3 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. 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 : 001-049, 051-099, 101-149, 151-199, ∞∞24-41-00∞∞∞∞∞∞∞∞∞∞Page 204
 201-299, 301-399, Aug 01/05 CES

 TASK 24-41-00-810-804

 Failure of the RS422 Electrical Connection between the GPCU and the GCU 1
 1. Possible Causes
_______________
 - GCU-1 (1XU1)

 - GPCU (1XG)

 - wiring between the circuit breaker (2XU1) and the GCU 1

 - C/B-ELEC/GCU/1 (2XU1)

 - wiring of the RS422 bus

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 24-22-34-000-001 Removal of the GCU-1(2) (1XU1, 1XU2)
　
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