PSIU - No Pax Call from two or three PSIUs in series

TASK 23-73-00-810-876-A
PSIU - No Pax Call from two or three PSIUs in series

1. Possible Causes

DEU-A (200RHxx)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-73-00-710-007	Operational Test of the Passenger Call System
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 23-73-00-710-238-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the CIDS BITE test through the CFDS AMM 23-73-00-740-005.
(2) Do the operational test of the passenger call system AMM 23-73-00-710-007.

4. Fault Isolation
Subtask 23-73-00-810-529-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 23-73-00-810-530-A ** ON A/C NOT FOR ALL

B. If the test shows a fault in two or three PSU/PSIUs in series:

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

Subtask 23-73-00-710-239-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