PA - No PA and cabin interphone from two and more cabin handsets

TASK 23-73-00-810-865-A
PA - No PA and cabin interphone from two and more cabin handsets

1. Possible Causes

DIR-CIDS, 1 [101RH]
DEU-B 300RHx
DEU-B

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-73-00-710-003	Operational Test of the Cabin and Flight Crew Interphone System
AMM 23-73-00-710-005	Operational Test of the Passenger Address (PA) system
AMM 23-73-00-710-021	Operational Test of the Cabin and Flight Crew Interphone System
AMM 23-73-00-710-022	Operational Test of the Passenger Address (PA) system
AMM 23-73-00-740-005	BITE-Test of the Cabin Intercommunication Data System (CIDS) through the CFDS
AMM 23-73-34-000-001	Removal of the CIDS Director
AMM 23-73-34-400-001	Installation of the CIDS Director
AMM 23-73-47-000-001	Removal of the Decoder/Encoder Unit B (300RH)
AMM 23-73-47-400-001	Installation of the Decoder/Encoder Unit B (300RH)

3. Fault Confirmation
Subtask 23-73-00-710-164-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 Address (PA) system.
AMM 23-73-00-710-005
(3) Do the operational test of the Cabin and Flight Crew Interphone system.
AMM 23-73-00-710-003

Subtask 23-73-00-710-164-C ** 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
(2) Do the operational test of the Passenger Address (PA) system.
AMM 23-73-00-710-005
(3) Do the operational test of the Cabin and Flight Crew Interphone system.
AMM 23-73-00-710-003

Subtask 23-73-00-710-164-D ** 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
(2) Do the operational test of the Passenger Address (PA) system.
AMM 23-73-00-710-022
(3) Do the operational test of the Cabin and Flight Crew Interphone system.
AMM 23-73-00-710-021

4. Fault Isolation
Subtask 23-73-00-810-389-A

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

Subtask 23-73-00-810-390-D ** ON A/C NOT FOR ALL

B. If there is no maintenance message, but there is a fault in one or both of the operational tests for two or more handsets:

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 CBs 156RH and 157RH.
stop for approx. 120 s,
do the operational tests again.

(1) If the tests are OK:

install a new DIR-CIDS, 1 [101RH] AMM 23-73-34-400-001.

(2) If the fault continues:

replace the related DEU-B 300RHx AMM 23-73-47-000-001 and AMM 23-73-47-400-001.

Subtask 23-73-00-810-390-F ** ON A/C NOT FOR ALL

B. If there is no maintenance message, but there is a fault in one or both of the operational tests for two or more handsets:

make sure that at least one cabin door is open.
open these CBs:
49VU: 150RH COM/CIDS/DIR ESS/1,
49VU: 157RH COM/CIDS/DIR ESS/2,
49VU: 15WH AIR COND/CIDS/SDF/DIR 1 ESS,
49VU: 18WH AIR COND/CIDS/SDF/DIR 2 ESS,
120VU: 151RH COM NAC/CIDS/DIR NORM/1,
120VU: 156RH COM NAV/CIDS/DIR NORM/2,
122VU: 14WH AIR COND/CIDS/SDF/DIR NORM/2,
122VU: 17WH AIR COND/CIDS/SDF/DIR NORM/1.
wait for approx. 10s and close the CBs 156RH, 157RH, 14WH and 18WH.
stop for approx. 120s,
do the operational tests again.

(1) If the tests are OK:

install a new DIR-CIDS, 1 [101RH] AMM 23-73-34-000-001 and AMM 23-73-34-400-001.

(2) If the fault continues:

replace the related DEU-B AMM 23-73-47-000-001 and AMM 23-73-47-400-001.

Subtask 23-73-00-810-390-G ** ON A/C NOT FOR ALL

B. If there is no maintenance message, but there is a fault in one or both of the operational tests for two or more handsets:

make sure that at least one cabin door is open.
open these CBs:
make sure that the EMER LT (4WL) is set to the OFF position.
49VU: 150RH COM/CIDS/DIR ESS/1,
49VU: 157RH COM/CIDS/DIR ESS/2,
49VU: 15WH AIR COND/CIDS/SDF/DIR 1 ESS,
49VU: 18WH AIR COND/CIDS/SDF/DIR 2 ESS,
120VU: 151RH COM NAC/CIDS/DIR NORM/1,
120VU: 156RH COM NAV/CIDS/DIR NORM/2,
122VU: 14WH AIR COND/CIDS/SDF/DIR NORM/2,
122VU: 17WH AIR COND/CIDS/SDF/DIR NORM/1.
wait for approx. 10s and close the CBs 156RH, 157RH, 14WH and 18WH.
stop for approx. 120s.
do the operational tests again.

(1) If the tests are OK:

install a new DIR-CIDS, 1 [101RH] AMM 23-73-34-000-001 and AMM 23-73-34-400-001.

(2) If the fault continues:

replace the related DEU-B AMM 23-73-47-000-001 and AMM 23-73-47-400-001.

Subtask 23-73-00-810-391-A

C. Install the removed DIR-CIDS, 1 [101RH] AMM 23-73-34-400-001.

Subtask 23-73-00-710-189-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:25:53 UTC