Sign - Info signs in series on one cabin side do not come on

TASK 23-73-00-810-874-A
Sign - Info signs in series on one cabin side do not come on

1. Possible Causes

DEU-A (200RHxx)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-73-00-740-005	BITE-Test of the Cabin Intercommunication Data System (CIDS) through the CFDS
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)

3. Fault Confirmation
Subtask 23-73-00-710-234-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the CIDS BITE test through the CFDS AMM 23-73-00-740-005.

NOTE: An erroneous class 3 fault will be recorded for each LED info sign (without bulbs), if the test of the related signs is not deactivated in the CAM.

(2) On the cockpit overhead panel 25VU:

set the NO SMOKING (190RH) switch to ON,
set the FASTEN SEAT BELT (191RH) switch to ON.

4. Fault Isolation
Subtask 23-73-00-810-524-A ** ON A/C NOT FOR ALL

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

Subtask 23-73-00-810-525-A ** ON A/C NOT FOR ALL

B. If the NS/FSB info signs at two or three PSIUs in series on one cabin side does not come on:

replace the related DEU-A (200RHxx) AMM 23-73-46-000-001 and AMM 23-73-46-400-001.

Subtask 23-73-00-710-235-A ** ON A/C NOT FOR ALL

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

[Rev.8 from Aug 2018] 2026.04.04 04:25:54 UTC