- Do a check for 28VDC at pin 1A or 1B of the MAINT BUS/ON switch (5XX) (Ref. ASM 24-42/01).
 (a) If there is 28VDC:

 - Replace the SW-MAINT BUS/ON (5XX).

 (b) If there is no 28VDC:

 - Do a check for 28VDC between pins A/X2 and A/A2 of the TR 2 overheat relay (6XX).
 1 If there is 28VDC:
_
 - Replace the RELAY-TR 2 OVHT (6XX).
 2 If there is no 28VDC:
_
 - Do a check for 28VDC between pin A/A2 or A/X1 of the TR 2 overheat relay (6XX) and the ground.
 a If there is no 28VDC:
_
 - Do a check and repair the wiring between pin 2 of the circuit breaker (6XG) and pins A/A2 and A/X1 of the TR 2 overheat relay (6XX) (Ref. ASM 24-42/01).
 b If there is 28VDC:
_
 - Do a check for 28VDC between pin A/X1 of the TR 2 overheat relay (6XX) and pin B/F of the TR 2 (1PU2).
 c If there is no 28VDC:
_
 - Replace the TR-2 (1PU2) (Ref. AMM TASK 24-32-51-000-001) and (Ref. AMM TASK 24-32-51-400-001).
 d If there is 28VDC:
_
 - Do a check and repair the wiring between pin A/X2 of the TR 2 overheat relay (6XX) and pin B/F of the TR 2 (1PU2) (Ref. ASM 24-42/01).
 B. Do the procedure given in Para. 3.A.

 DC GROUND SERVICE BUS CONTROL - FAULT ISOLATION PROCEDURES
__________________________________________________________
 TASK 24-43-00-810-801
 Loss of the 601PP and 602PP Busbars in Ground Service Configuration
 1. Possible Causes
_______________
 - CNTOR-DC SVCE BUS GND SPLY (3PX)

 - wiring

 - C/B-SVCE 601PP/602PP SPLY (1PX)

 - C/B-ELEC/DC SVCE/BUS/ON TR2 (5PX)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
AMM 24-42-00-861-001 Energize the Ground Service Network from the External Power AMM 24-42-00-862-001 De-energize the Ground Service Network Supplied from the External Power AMM 24-43-55-000-001 Removal of the DC Service Bus Ground Supply Contactor (3PX) AMM 24-43-55-400-001 Installation of the DC Service Bus Ground Supply Contactor (3PX) ASM 24-43/01
 3. Fault Confirmation
__________________
 A. Job Set-up
 (1) Energize the ground service network with the ground power unit (Ref. AMM TASK 24-42-00-861-001).
 B. Test
 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. On the overhead panel 25VU, put  The CAPT dome lights do not come on.
 the INT LT/DOME switch in the BRT
 position.

 「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 ∞∞24-43-00∞∞∞∞∞∞∞∞∞∞Page 201
 Feb 01/98 CES

 4. Fault Isolation
_______________

R **ON A/C 001-049, 051-062, 101-105, 151-152, 201-205,
 A. If the test confirms the fault:
 - do a check of the status of the circuit breaker (1PX).
 (1) If the circuit breaker is closed:
 - do a check for 28VDC on the pin E of the DC SVCE BUS ground supply contactor (Ref. ASM 24-43/01).
 (a) If there is no 28VDC:
 - do a check of the wiring between the circuit breaker (1PX) and the DC SVCE BUS ground supply contactor (Ref. ASM 24-43/01).
 1 If there is no continuity:
_ - repair the wiring.
 2 If there is continuity:
_
 - replace the C/B-SVCE 601PP/602PP SPLY (1PX).
 (b) If there is 28VDC:
 - do a check for 28VDC on the pin 3 of the DC SVCE BUS ground supply contactor (Ref. ASM 24-43/01).
 1 If there is no 28VDC:
_
 - do a check of the wiring between the pin E and the pin 5 of the contactor (Ref. ASM 24-43/01).
 a If there is no continuity:
_ - repair the wiring.
 b If there is continuity:
_
 - replace the C/B-ELEC/DC SVCE/BUS/ON TR2 (5PX) or the CNTOR-DC SVCE BUS GND SPLY (3PX) (Ref. AMM TASK 24-43-55-000-001) and (Ref. AMM TASK 24-43-55-400-001).
 2 If there is 28VDC:
_
 - replace the CNTOR-DC SVCE BUS GND SPLY (3PX) (Ref. AMM TASK 24-43-55-000-001) and (Ref. AMM TASK 24-43-55-400-001).
 (2) If the circuit breaker is open:
 - close it.
 (a) If the circuit breaker trips:
 - do a check for short to ground of the wiring between the circuit breaker (1PX) and the busbars (601PP) and (602PP) (Ref. ASM 24-43/01).
　
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