4. Fault Isolation
_______________
A. If the operational test gives the maintenance message RDG LIGHT PCB XX L, R (XX seats) and one or more lamps do not come on:
- replace the lamps that do not come on (Ref. AMM TASK 23-73-64-000-001) and (Ref. AMM TASK 23-73-64-400-001).
(1) If the fault continues:
- replace the related READING-LIGHT POWER UNIT (Ref. AMM TASK 23-73-38-000-001) and (Ref. AMM TASK 23-73-38-400-001).
(a) If the fault continues:
- replace the related PCB 2038VUA (Ref. AMM TASK 23-73-49-000-001) and (Ref. AMM TASK 23-73-49-400-001).
B. If the operational test gives the maintenance message RDG LIGHT PCB XX L, R and all the reading lights come on:
- replace the related DEU-A (Ref. AMM TASK 23-73-46-000-001) and (Ref. AMM TASK 23-73-46-400-001).
(1) If the fault continues:
- do a check and repair the wiring between the related: READING-LIGHT POWER UNIT conn. A/J and DEU-A conn. C/36 (Page 101) READING-LIGHT POWER UNIT conn. A/J and DEU-A conn. C/43 (Page 102) READING-LIGHT POWER UNIT conn. A/J and DEU-A conn. C/29 (Page 103) READING-LIGHT POWER UNIT conn. A/B and GND (Ref. ASM 23-73/13) and (Ref. ASM 33-25/01).
C. Do the test as given in the Para. 3.A .
5. Close-up
________
A. Put the aircraft back to its initial configuration.
TASK 33-25-00-810-803
Reading Light - Fault in the Power Supply to the Reading Lights
1. Possible Causes
_______________
- READING-LIGHT POWER UNIT
- wiring
- RELAY 7LW
- RELAY 8LW
- DEU-A
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 23-73-38-000-001 Removal of the Power Unit for the Passenger Reading Light AMM 23-73-38-400-001 Installation of the Power Unit for the Passenger
Reading Light AMM 23-73-46-000-001 Removal of the Decoder/Encoder Unit (DEU) A 200RH AMM 23-73-46-400-001 Installation of the Decoder/Encoder Unit (DEU) A
200RH
AMM 33-25-00-710-001 Operational Test of the Passenger Reading
Light-System
ASM 23-73/13
ASM 33-25/01
3. Fault Confirmation
__________________
A. Do the CIDS1/READING/WORK-LIGHTS test through the CFDS.
B. Do the operational test of the passenger reading-light system (Ref. AMM TASK 33-25-00-710-001).
4. Fault Isolation
_______________
R
R A. If the test gives a different maintenance message, do the trouble R shooting procedure related to the maintenance message.
「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 ∞∞33-25-00∞∞∞∞∞∞∞∞∞∞Page 205
May 01/05 CES
B. If the operational test gives the maintenance message POWER PCB XX R (XX seat row) and all reading lights on one right side PSIU do not come on:
- do a check for 115 VAC at the related READING-LIGHT POWER UNIT
connector A/A (Ref. ASM 23-73/13).
(1) If there is approx. 115 VAC:
- replace the related READING-LIGHT POWER UNIT (Ref. AMM TASK 23-73-38-000-001) and (Ref. AMM TASK 23-73-38-400-001).
(2) If there is no 115 VAC:
- do a check and repair the wiring between the related: READING-LIGHT POWER UNIT conn. A/A and RELAY 7LW conn. A2, READING-LIGHT POWER UNIT conn. A/A and RELAY 7LW conn. B2, READING-LIGHT POWER UNIT conn. A/A and RELAY 7LW conn. C2, READING-LIGHT POWER UNIT conn. A/B and GND (Ref. ASM 23-73/13) and (Ref. ASM 33-25/01).
C. If the operational test gives the maintenance message POWER PCB XX L (XX seat row) and all reading lights on one left side PSIU do not come on:
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