- replace the related NS-FSB 531RH sign lamp (Ref. AMM TASK 23-73-63-000-001) and (Ref. AMM TASK 23-73-63-400-001).
 C. If the fault continues:
 - do a check for 28 VDC at pins P and K on the PCB 2038VU (Ref. ASM 23-73/13) and (Ref. ASM 23-73/14).
 (1) If there is approx. 28 VDC:
 - do a check and repair the wiring if necessary between the: NS-FSB sign and the PCB 2038VU.
 (a) If there is no 28 VDC:
 - do a check for 28 VDC at pins C and N on the PCB 2038VU.
 1 If there is approx. 28 VDC:
_
 - replace the PCB 2038VU (Ref. AMM TASK 23-73-49-000-001) and (Ref. AMM TASK 23-73-49-400-001).
 (2) If there is no 28 VDC:
 - do a check for 28 VDC at the related DEU-A between the related pairs of connectors given below: Connectors C/18 and C/22 or Connectors C/19 and C/24 or Connectors C/20 and C/26 (Ref. ASM 23-73/13) and (Ref. ASM 23-73/14).
 (a) If there is approx. 28 VDC:

 - do a check and repair the wiring if necessary between pins C and N on the PCB 2038VU and the related DEU-A pairs of connectors given below: Connectors C/18 and C/22 or Connectors C/19 and C/24 or Connectors C/20 and C/26 (Ref. ASM 23-73/13) and (Ref. ASM 23-73/14).

 (b) If there is no 28 VDC:

 - replace the related DEU-A (Ref. AMM TASK 23-73-46-000-001) and (Ref. AMM TASK 23-73-46-400-001).
R **ON A/C 106-149, 301-399, 401-499,
 B. If the test confirms the fault:
 - replace the related NS-FSB sign (Ref. AMM TASK 23-73-63-000-001) and (Ref. AMM TASK 23-73-63-400-001) or (Ref. AMM TASK 23-73-63-000-002) and (Ref. AMM TASK 23-73-63-400-002).
 (1) If the fault continues:
 - replace the related PISA (Ref. AMM TASK 23-73-41-000-001) and (Ref. AMM TASK 23-73-41-400-001).
 「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 ∞∞23-73-00∞∞∞∞∞∞∞∞∞∞Page B215
 Aug 01/05 CES C. If the fault continues:

 - do a check and repair if necessary the wiring between the related PISA connector and the NS/FSB sign at the signal names: FSB 28 VDC OUT FSB/NS RETURN (Ref. ASM 23-73/13) (Ref. ASM 23-73/14).
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
 D. If the CIDS1/SIGN LAMP test gives the maintenance message FSB LAMP XX, L, R (XX seat row) but the lamps come on:
 NOTE : An erroneous class 3 fault message will be recorded for each LED
____ NS/FSB sign (without bulbs), if the test of the related signs is not deactivated in the CAM.
 - replace the related DEU-A (Ref. AMM TASK 23-73-46-000-001) and (Ref. AMM TASK 23-73-46-400-001).
 E. If no FSB lamps come on:
 - do a check of the SEAT BELTS switch and replace it if necessary.
 (1) If the fault continues:
 - do a check and repair the wiring if necessary between the: DIR-CIDS (101RH) connector AB/E15 and GND of SEAT BELTS switch (191RH) (Ref. ASM 23-73/02).
 F. If the fault continues:
 - replace the DIR-CIDS, 1 (101RH) (Ref. AMM TASK 23-73-34-000-001) and (Ref. AMM TASK 23-73-34-400-001).
 **ON A/C ALL
 G. Do the test given in Para. 3.A.
 「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 ∞∞23-73-00∞∞∞∞∞∞∞∞∞∞Page B216
 Aug 01/05R
 CES  TASK 23-73-00-810-841

 Sign - Fault in the RETURN TO SEAT Sign in Lav x
 1. Possible Causes
_______________
 - RTS lamp

 - LIGHT PNL (581RHx)

 - wiring

 - DEU-A (200RHxx)

 - PSU 596RHx

 - RTS sign

 - DEU-A

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 23-73-00-710-033 Pax Call Lamps Test from the MCDU AMM 23-73-00-710-035 Operational Test of the Cabin LED Lamps via MCDU AMM 23-73-00-740-010 Interface and Power-Up Test of the Cabin
 Intercommunication Data System (CIDS) via the CFDS 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 23-73-62-000-001 Removal of the Return To Seat Sign
 AMM 23-73-62-000-006 Removal of the LED Return To Seat-Sign
 AMM 23-73-62-400-001 Installation of the Return To Seat Sign
 AMM 23-73-62-400-006 Installation of the LED Return To Seat-Sign
　
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