Loss of the Transmission from the Third Occupant Boomset

TASK 23-51-00-810-837-A
Loss of the Transmission from the Third Occupant Boomset

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-51-00-710-001	Operational Test of the Audio Management
ASM 235104
AIPC 235108
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 23-51-00-710-078-A

A. Test
(1) Do the operational test of the audio management system AMM 23-51-00-710-001.

4. Fault Isolation
Subtask 23-51-00-810-086-B

A. If the reception is incorrect after you speak in the Third Occupant boomset microphone:
(1) At each loud speaker and boomset of each crew station:

Connect a new boomset to the RCPT-BOOMSET, 3RD OCCPNT [17RN3] on the panel 62VU.

(a) If the fault continues:

1 If the fault continues:

a If the fault continues:

Do a check and repair the wiring from the RCPT-BOOMSET, 3RD OCCPNT [17RN3] pins 3, 4 to the AMU [1RN] pins AA/15D, 15E ASM 235104.

(2) At the Third Occupant headset only:

(a) If the fault continues:

Do a check and repair the wiring from the JACK-HEADSET, 3RD OCCPNT [18RN3] pins 1, 2 to RCPT-BOOMSET, 3RD OCCPNT [17RN3] pins 2, 1 ASM 235104.

Subtask 23-51-00-710-079-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:46 UTC