TASK 24-41-00-810-808
Loss of the CFDIU Discrete Signal to the GPCU
1. Possible Causes
_______________
- GPCU (1XG)
- CFDIU (1TW)
- wiring
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
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)
AMM 31-32-34-000-001 Removal of the CFDIU (1TW)
AMM 31-32-34-400-001 Installation of the CFDIU (1TW)
ASM 31-32/06
3. Fault Confirmation
__________________
A. Test
(1) Do the operational test of the ground power control unit (Ref. AMM TASK 24-41-00-740-002).
4. Fault Isolation
_______________
A. If the test gives the maintenance message CHECK GPCU PIN A4B CFDIU 1TW PIN A9K WIRING:
- replace the GPCU (1XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref. AMM TASK 24-41-34-400-001).
(1) If the fault continues:
- replace the CFDIU (1TW) (Ref. AMM TASK 31-32-34-000-001) and (Ref. AMM TASK 31-32-34-400-001).
(2) If the fault continues:
- do a check and repair the wiring from the pin AA/4B of the GPCU (1XG) to the pin AA/9K of the CFDIU (1TW) (Ref. ASM 31-32/06).
B. Do the test given in Para. 3.
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201-299, 301-399, Aug 01/05 CES
R **ON A/C ALL
TASK 24-41-00-810-809
Aircraft Electrical Circuits cannot be supplied from the External Power
1. Possible Causes
_______________
- RCPT-EXT PWR (20XG)
- EPC (3XG)
- GLC-APU (3XS)
- RELAY-EPC AUX CTL (5XG)
- GLC-1 (9XU1)
- GLC-2 (9XU2)
- wiring
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 24-22-55-000-001 Removal of the Contactors (9XU1, 9XU2, 11XU1, 11XU2) AMM 24-22-55-400-002 Installation of the Contactors (9XU1, 9XU2, 11XU1,
11XU2) AMM 24-23-55-000-001 Removal of the APU GLC (3XS) AMM 24-23-55-400-001 Installation of the APU GLC (3XS) AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the
External Power AMM 24-41-51-000-001 Removal of the External Power Receptacle (20XG) AMM 24-41-51-400-001 Installation of the External Power Receptacle (20XG) AMM 24-41-55-000-001 Removal of the External Power Contactor (EPC) AMM 24-41-55-400-001 Installation of the External Power Contactor (EPC) ASM 24-41/01
3. Fault Confirmation
__________________
A. Energize the Aircraft Electrical Circuits from the External Power (Ref. AMM TASK 24-41-00-861-002).
NOTE : Examine the external power supply-cable and the external power
____ receptacle before you do the connection. If you find corrosion or damage, or if the pins are not aligned correctly, replace the RCPT-EXT PWR (20XG) (Ref. AMM TASK 24-41-51-000-001) and (Ref. AMM TASK 24-41-51-400-001).
4. Fault Isolation
_______________
A. If the above procedure confirms the results below when the EXT PWR pushbutton switch is pushed: . the AVAIL legend of the EXT PWR pushbutton switch stays on, . the ON legend of the EXT PWR pushbutton switch does not come on, . the FAULT legend of the GEN1 and the GEN2 pushbutton switches stays off.
- Do a check for 28VDC between pins B/3 and 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 no 28VDC:
- Do a check for 28VDC at pins A/D1 then A/X1 of the EPC auxiliary control relay (5XG).
(a) If there is 28VDC:
- Do a check for 28VDC at pin B/24 of the APU GLC (3XS) (Ref. ASM 24-41/01).
1 If there is 28VDC:
_
- Replace the GLC-APU (3XS) (Ref. AMM TASK 24-23-55-000-001) and (Ref. AMM TASK 24-23-55-400-001).
2 If there is no 28VDC:
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