CIDS - No CIDS function in 50% of the cabin

TASK 23-73-00-810-881-A
CIDS - No CIDS function in 50% of the cabin

1. Possible Causes

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
ASM 237306
ASM 237307
ASM 237308
AMM 23-73-34-400-001	Installation of the CIDS Director
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 23-73-00-710-267-A ** ON A/C NOT FOR ALL

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

4. Fault Isolation
Subtask 23-73-00-810-574-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 23-73-00-810-575-F ** ON A/C NOT FOR ALL

B. If the CFDS gives the maintenance message:

50% DEU-A
DEU-A 200RHXX (all effected DEU-A 200RH are shown)

make sure that at least one cabin door is open.
make sure that the EMER LT (4WL) switch is in the OFF position,
open these CBs:
49VU: 150RH (G01) COM DIR ESS/1
49VU: 157RH (G02) COM DIR ESS/2
121VU:151RH (M06) CIDS/DIR NORM/1
121VU:156RH (M07) CIDS/DIR NORM/2,
wait for approx. 10 s and close the CB 156RH and 157RH,
stop for approx. 120 s,
do the CIDS BITE test again.

(1) If the test is OK:

(2) If the fault continues:

(a) If the fault continues:

Subtask 23-73-00-710-268-A ** ON A/C NOT FOR ALL

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

[Rev.8 from Aug 2018] 2026.04.04 04:25:55 UTC