Sign - Fault in the pax sign (NO SMOKING/NO ELECTRONIC DEVICES/NO MOBILE)

TASK 23-73-00-810-839-A
Sign - Fault in the pax sign (NO SMOKING/NO ELECTRONIC DEVICES/NO MOBILE)

1. Possible Causes

NS-FSB sign lamp
NS-FSB sign
PISA
wiring
PCB 2038VU
DEU-A
NO SMOKING switch
DIR-CIDS, 1 [101RH]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-73-00-710-035	Operational Test of the Cabin LED lamps through the MCDU
AMM 23-73-00-710-037	Operational Test of the Cabin Signs through the MCDU
AMM 23-73-00-740-005	BITE-Test of the Cabin Intercommunication Data System (CIDS) through the CFDS
ASM 237302
ASM 237306
ASM 237307
ASM 237313
ASM 237314
AMM 23-73-34-000-001	Removal of the CIDS Director
AMM 23-73-34-400-001	Installation of the CIDS Director
AMM 23-73-41-000-001	Removal of the Passenger Interface and Supply Adapter (602RH)
AMM 23-73-41-400-001	Installation of the Passenger Interface and Supply Adapter (602RH)
AMM 23-73-46-000-001	Removal of the Decoder/Encoder Unit A (200RH)
AMM 23-73-46-400-001	Installation of the Decoder/Encoder Unit A (200RH)
AMM 23-73-49-000-001	Removal of the Printed Circuit Board
AMM 23-73-49-400-001	Installation of the Printed Circuit Board
ASM 237354
ASM 237356
AMM 23-73-63-000-001	Removal of the No Smoking/Fasten Seat Belt sign from the Passenger Service Information Unit and the C/B panels 2000VU/2001VU
AMM 23-73-63-000-002	Removal of the No Smoking/Fasten Seat Belt sign from the cabin
AMM 23-73-63-400-001	Installation of the No Smoking/Fasten Seat Belt sign in the Passenger Service Information Unit and the C/B panels 2000VU/2001VU
AMM 23-73-63-400-002	Installation of the No Smoking/Fasten Seat Belt sign in the cabin

3. Fault Confirmation
Subtask 23-73-00-710-057-B ** ON A/C NOT FOR ALL

A. Test
(1) Do the CIDS Interface and Power-Up Test via the CFDS AMM 23-73-00-740-005.
(2) Do the Operational Test of the Cabin LED Lamps via the CFDS AMM 23-73-00-710-035.

Subtask 23-73-00-710-057-C ** ON A/C NOT FOR ALL

A. Test
(1) Do the Operational Test of the Cabin LED Lamps via the CFDS AMM 23-73-00-710-037

4. Fault Isolation
Subtask 23-73-00-810-058-A

A. If the test gives a different maintenance message, do the trouble shooting procedure related to the maintenance message.

Subtask 23-73-00-810-160-A ** ON A/C NOT FOR ALL

B. If the CIDS1/SIGN LAMP test gives the maintenance message NS LAMP XX and the lamp does not come on:

NOTE: XX identifies the location of the faulty unit:

SR: ..L/R,
FWD L/R, 1/2,
AFT L/R, 1/2.

replace the related NS-FSB sign lamp AMM 23-73-63-000-001 and AMM 23-73-63-400-001.

Subtask 23-73-00-810-161-A ** ON A/C NOT FOR ALL

C. If the fault continues:

do a check for 28 VDC at pins K and M on the PCB 2038VU ASM 237313 ASM 237314.

(1) If there is approx. 28 VDC:

do a check and repair the wiring if necessary between the:
NS-FSB sign and PCB 2038VU.

(a) If there is no 28 VDC:

do a check for 28 VDC at pins C and L on the PCB 2038VU.

1 If there is approx. 28 VDC:

replace the PCB 2038VU AMM 23-73-49-000-001 and AMM 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/21 or
Connectors C/19 and C/23 or
Connectors C/20 and C/25 ASM 237313 and ASM 237314.

(a) If there is approx. 28 VDC:

do a check and repair the wiring if necessary between the:
Pins C and L on the PCB 2038VU and the related DEU-A pairs of connectors given below:
Connectors C/18 and C/21 or
Connectors C/19 and C/23 or
Connectors C/20 and C/25 ASM 237313 and ASM 237314.

(b) If there is no 28 VDC:

replace the related DEU-A AMM 23-73-46-000-001 and AMM 23-73-46-400-001.

Subtask 23-73-00-810-160-C ** ON A/C NOT FOR ALL

D. If the test confirms the fault:

replace the related NS-FSB sign AMM 23-73-63-000-001 and AMM 23-73-63-400-001 or AMM 23-73-63-000-002 and AMM 23-73-63-400-002.

(1) If the fault continues:

replace the related PISA AMM 23-73-41-000-001 and AMM 23-73-41-400-001.

Subtask 23-73-00-810-161-C ** ON A/C NOT FOR ALL

E. 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:
NS OUT +VE
NS&FSB SIGN GND
ASM 237354
ASM 237356.
do a check and repair if necessary the wiring between the related StA-PISA connector and the NS/FSB sign at the signal names:
NS1_P
NS1_N
NS_CLASS_DIV._P (if installed)
NS_CLASS_DIV._N (if installed)
ASM 237307
ASM 237314.

Subtask 23-73-00-810-162-A ** ON A/C NOT FOR ALL

F. If the CIDS1/SIGN LAMP test gives the maintenance message NS 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 AMM 23-73-46-000-001 and AMM 23-73-46-400-001.

Subtask 23-73-00-810-163-A ** ON A/C NOT FOR ALL

G. If no NS lamps come on:

do a check of the NO SMOKING switch and replace it if necessary ASM 237306.

(1) If the fault continues:

do a check and repair the wiring if necessary between the:
NO SMOKING switch (190RH) connector 2/C and DIR-CIDS (101RH) connector AB/C15,
NO SMOKING switch (190RH) connector 1/B and DIR-CIDS (101RH) connector AB/D15,
NO SMOKING switch (190RH) connector 3/B and GND ASM 237302.

Subtask 23-73-00-810-164-A ** ON A/C NOT FOR ALL

H. If the fault continues:

replace the DIR-CIDS, 1 [101RH] AMM 23-73-34-000-001 and AMM 23-73-34-400-001.

Subtask 23-73-00-810-165-A

I. Do the test given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:25:52 UTC