Failure of the Light of the MECH Transmission Pushbutton Switch on the Audio Control Panel

TASK 23-42-00-810-803-A
Failure of the Light of the MECH Transmission Pushbutton Switch on the Audio Control Panel

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-42-00-710-001	Operational Test of the Mechanic Call
ASM 234201
AMM 23-51-12-000-001	Removal of the Audio Control Panel (ACP) (2RN1, 2RN2, 2RN3, 2RN4, 2RN5)
AMM 23-51-12-400-001	Installation of the Audio Control Panel (ACP) (2RN1, 2RN2, 2RN3, 2RN4, 2RN5)
AMM 23-51-34-000-001	Removal of the Audio Management Unit (AMU) (1RN)
AMM 23-51-34-400-001	Installation of the Audio Management Unit (AMU) (1RN)

3. Fault Confirmation
Subtask 23-42-00-710-054-A

A. Test
(1) Do the operational test of the mechanic call AMM 23-42-00-710-001.

4. Fault Isolation
Subtask 23-42-00-810-052-A

A. If during the operational test the amber MECH annunciator light do not flash on one ACP:

replace the ACP-CAPT [2RN1] or ACP-F/O [2RN2] or ACP-3RD OCCPNT [2RN3] AMM 23-51-12-000-001 and AMM 23-51-12-400-001.

Subtask 23-42-00-810-053-A

B. If during the operational test the amber MECH annunciator light do not flash on all the ACPs:

(1) If the fault continues:

do a check and repair the wiring of AMU (1RN) pin AB/9A to the first terminal block ASM 234201.

Subtask 23-42-00-710-055-A

C. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:42 UTC