4. Fault Isolation
_______________
A. If the test confirms the fault:
- do the operational test of the annunciator light test system (Ref. AMM TASK 33-14-00-710-001).
(1) If the ON legend of the ELEC/EXT PWR pushbutton switch comes on:
- replace the EPC (3XG) (Ref. AMM TASK 24-41-55-000-001) and (Ref. AMM TASK 24-41-55-400-001).
(a) If the fault continues:
- do a check and repair the wiring between the pin A/5 of the ELEC/EXT PWR pushbutton switch and the pin A/17 of the EPC (3XG) and between the pin A/15 of the EPC (3XG) and the first terminal block.
(2) If the ON legend of the ELEC/EXT PWR pushbutton switch stays off:
- replace the LAMP of the ON legend of this pushbutton switch.
(a) If the fault continues:
- do a check of the wiring from the ELEC/EXT PWR pushbutton switch to the first terminal block (Ref. ASM 24-41/01).
1_ If there is no continuity:
- repair the wiring.
2_ If there is continuity:
- replace the P/BSW-ELEC/EXT PWR (10XG).
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, on the ELEC/EXT PWR pushbutton switch : the AVAIL legend goes off and the ON legend comes on.
(2) De-energize the aircraft electrical circuits from the external power (Ref. AMM TASK 24-41-00-862-002).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞24-40-00∞∞∞∞∞∞∞∞∞∞Page 216
201-299, 301-399, Aug 01/05 CES
TASK 24-40-00-810-808
The EXT PWR/AVAIL Caution Light Stays off when the EXT PWR Energizes the
Aircraft
1. Possible Causes
_______________
- wiring
- CAUT LT-EXT PWR/AVAIL (9XG)
- lamp
- IND LT_EXT PWR/AVAIL (9XG)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power ASM 24-41/01
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.D., make sure that: - on the panel 108VU: the EXT PWR/NOT IN USE indicator light
comes on and the EXT PWR/AVAIL caution light stays off.
- on the panel 35VU: the AVAIL legend of the EXT PWR pushbutton switch comes on.
4. Fault Isolation
_______________
A. If the test confirms the fault:
- on the panel 108VU, push the LIGHT TEST pushbutton switch (34LP) to do a test of the lights of the panel 108VU.
(1) If the EXT PWR/AVAIL caution light comes on:
- do a check of the wiring between the pin 2 of the circuit breaker (4XG) and the first terminal block (Ref. ASM 24-41/01).
(a) If there is no continuity:
- repair the above wiring.
「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, ∞∞24-40-00∞∞∞∞∞∞∞∞∞∞Page 217
201-299, 301-399, Aug 01/05 CES (b) If there is continuity:
- replace the CAUT LT-EXT PWR/AVAIL (9XG).
(2) If the EXT PWR/AVAIL caution light stays off:
- replace the lamp of the EXT PWR/AVAIL caution light.
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