STA PISA (xxxLZ) or DEU A fault

TASK 23-73-00-810-954-A
STA PISA (xxxLZ) or DEU A fault

1. Possible Causes

STA PISA (XXXLZ)
DEU A 200RHYY
wiring

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 237307
ASM 237314
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 33-27-41-000-001	Removal of the Stand-Alone Passenger Interface and Supply Adapter (StA-PISA)
AMM 33-27-41-400-001	Installation of the Stand-Alone Passenger Interface and Supply Adapter (StA-PISA)

3. Fault Confirmation
Subtask 23-73-00-710-387-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the CIDS Interface and Power-Up Test through the CFDS.
AMM 23-73-00-740-005

4. Fault Isolation
Subtask 23-73-00-810-745-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 23-73-00-810-746-A ** ON A/C NOT FOR ALL

B. If the test confirms the fault:

Replace the related STA PISA (XXXLZ) AMM 33-27-41-000-001 and AMM 33-27-41-400-001.

(1) If the fault continues:

Replace the related DEU A 200RHYY AMM 23-73-46-000-001 and AMM 23-73-46-400-001

(2) If the fault continues:

Do a check and repair the wiring between:
STA PISA connector A / signal LVDS P and the related DEU A 200RH connector C / signal LVDS P,
STA PISA connector A / signal LVDS N and the related DEU A 200RH connector C / signal LVDS N,
STA PISA connector A / signal CHASSIS GND and the related DEU 200RH connector C / signal GND,
STA PISA connector A / signal 28VDC and the related DEU 200RH connector C / signal 28VDC,
STA PISA connector A / signal DC GND and the related DEU 200RH connector C / signal DC GND,
ASM 237307 ASM 237314

5. Close-up
Subtask 23-73-00-710-388-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:26:00 UTC