Failure of the MMR1

TASK 34-36-00-810-842-A
Failure of the MMR1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-36-00-740-003	BITE Test of the MMR
ASM 343601
AMM 34-36-31-000-001	Removal of the ILS Receiver
AMM 34-36-31-400-001	Installation of the ILS Receiver

3. Fault Confirmation
Subtask 34-36-00-740-190-A ** ON A/C NOT FOR ALL

A. On the circuit breaker panel 49VU:

Do a reset of the MMR1 (40RT1) through the C/B 42RT1 for more than 10 seconds (open and close this C/B).

Subtask 34-36-00-740-100-A

B. Test
Do the BITE test of the MMR1 AMM 34-36-00-740-003.

4. Fault Isolation
Subtask 34-36-00-810-158-A ** ON A/C NOT FOR ALL

A. If the test does not give the maintenance message MMR1 (40RT1):

Subtask 34-36-00-810-102-A

B. If the test gives the maintenance message MMR1 (40RT1):

(1) If there is no ground signal:

Do a check and repair the wiring between the MMR receiver 1 and the first ground terminal : pin AC/7 of the MMR receiver 1 ASM 343601
Install the MMR-1 [40RT1] AMM 34-36-31-400-001.

(2) If there is a ground signal:

(a) If there is no 115VAC:

Do a check and repair the wiring between the circuit breaker (42RT1) and the MMR receiver 1: pin AC/9 of the MMR receiver 1 ASM 343601
Install the MMR-1 [40RT1] AMM 34-36-31-400-001.

(b) If there is 115VAC:

Subtask 34-36-00-740-101-A

C. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:00 UTC