R R  2_  If there is no short to ground:- replace the C/B-TR2/SVCE/BUS2/SPLY (1XX). 
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: - the ceiling forward and aft lights (R side) come on. - the window forward and aft lights (R side) come on.
 5. Close-up________
 A. Put the aircraft back to its initial configuration.
 (1) On the forward attendant panel 120RH release the CABIN WDO and CABIN CLG pushbutton switches.
 (2) De-energize the ground service network with the ground power unit (Ref. AMM TASK 24-42-00-862-001).

 TASK 24-42-00-810-803
 Ground Service Buses cannot be supplied from the External Power
 1. Possible Causes
_______________
 - RCPT-EXT PWR (20XG)

 - SW-MAINT BUS/ON (5XX)

 - RELAY-GND/FLT SELECT CTL (7XX)

 - CNTOR-AC SVCE BUS NORM SPLY (12XN)

 - CNTOR-AC GND SVCE SPLY (12XX)

 - RELAY-TR 2 OVHT (6XX)

 - TR-2 (1PU2)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 24-32-51-000-001 Removal of the Transformer Rectifier (1PU1, 1PU2) AMM 24-32-51-400-001 Installation of the Transformer Rectifier (1PU1,
 1PU2) 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 24-42-00-861-001 Energize the Ground Service Network from the External
 Power AMM 24-42-55-000-001 Removal of the Contactors (12XX, 14XX) AMM 24-42-55-400-001 Installation of the Contactors (12XX, 14XX) AMM 24-51-55-000-001 Removal of the AC Service Bus Normal Supply Contactor
 (12XN) AMM 24-51-55-400-001 Installation of the AC Service Bus Normal Supply Contactor (12XN) ASM 24-42/01
 3. Fault Confirmation
__________________
 A. Energize the Ground Service Network from the External Power (Ref. AMM TASK 24-42-00-861-001).
 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).
 「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 ∞∞24-42-00∞∞∞∞∞∞∞∞∞∞Page 209
 Aug 01/00R
 CES

 4. Fault Isolation
_______________

 A. If the above procedure confirms that the EXT PWR/NOT IN USE indicator light stays on:
 - Do a check of the position of the MAINT BUS/ON switch (5XX).
 (1) If the switch stays in the ON position:
 - is a check for 28VDC at pin A/B2 of the GND/FLT selection control relay (7XX) (Ref. ASM 24-42/01).
 (a) If there is no 28VDC:
 - Replace the SW-MAINT BUS/ON (5XX).
 1 If the fault continues:
_
 - Do a check and repair the wiring between pin 2A of the MAINT BUS/ON switch (5XX) and pin A/B2 of the GND/FLT selection control relay (7XX) (Ref. ASM 24-42/01).
 (b) If there is 28VDC:
 - Do a check for 28VDC at pin B/12 of the AC service bus normal supply contactor (12XN).
 1 If there is no 28VDC:
_
 - Replace the RELAY-GND/FLT SELECT CTL (7XX).
 a If the fault continues:
_
 - Do a check and repair the wiring between pin B/12 of the AC service bus normal supply contactor (12XN) and pin A/B3 of the GND/FLT selection control relay (7XX).
 2 If there is no 28VDC:
_
 - Do a check for 28VDC at pin B/3 of the AC ground service supply contactor (12XX).
 a If there is no 28VDC:
_
 - Replace the CNTOR-AC SVCE BUS NORM SPLY (12XN) (Ref. AMM TASK 24-51-55-000-001) and (Ref. AMM TASK 24-51-55-400-001).
 b If the fault continues:
_
 - Do a check and repair the wiring between pin B/3 of the AC ground service supply contactor (12XX) and pin B/10 of the AC service bus normal supply contactor (12XN).
 c If there is 28VDC:
_
 - Replace the CNTOR-AC GND SVCE SPLY (12XX) (Ref. AMM TASK 24-42-55-000-001) and (Ref. AMM TASK 24-42-55-400-001).
 「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 ∞∞24-42-00∞∞∞∞∞∞∞∞∞∞Page 210
　
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