(a)  
Remove the navigation control panel. To remove it, do this task: Navigation Control Panel Removal, AMM TASK 34-31-52-000-801.

(b)  
Remove the MMR. To remove it, do this task: Receiver for ILS -Removal, AMM TASK 34-31-42-000-801.

(c)  
Do a continuity check between the MMR and the applicable navigation control panel:

NAV MMR CONNECTOR CONNECTOR CAPTAIN (P8-25) D303 D10719B
pin28 -------------------pinJ1 pin29 -------------------pinK1

FIRST OFFICER D305 D10721B (P8-26)
pin28 -------------------pinJ1 pin29 -------------------pinK1

(d)  If there is not continuity, then do these steps: 1) Repair the wiring. 2) Re-install the navigation control panel. To install it, do this task: Navigation Control
Panel Installation, AMM TASK 34-31-52-400-801. 3) Re-install the MMR. To install it, do this task: Receiver for ILS -Installation, AMM
TASK 34-31-42-400-801. 4) Do
this
task:
ILS
or
Multi-Mode
Receiver
BITE
Procedure,
34-31
TASK
801.
5) If the green LRU STATUS light comes on after approximately 15 seconds, then you
corrected the fault.
-------------------------END OF TASK ---------------------------
SIL 001-003
814.  MMR Failed -Fault Isolation
A. Description
(1)
The task is for this maintenance message:

(a)  MMR FAILED

(2)
The multi-mode receiver (MMR) has an internal failure.

B. Possible Causes
(1) Multi-mode receiver, M2104 (MMR-1) or M2105 (MMR-2).
C. Circuit Breakers
(1) These are the primary circuit breakers related to the fault:
CAPT Electrical System Panel, P18-1
Row Col Number Name
A 2 C01479 RADIO NAVIGATION MMR 1

EFFECTIVITY

34-31 TASKS 813-814
SIL ALL
Page 221 D633A103-SIL Jun 15/2010

F/O Electrical System Panel, P6-1
Row Col Number Name
A 13 C01480 RADIO NAVIGATION MMR 2

D. Related Data
(1)
(SSM 34-31-11, SSM 34-31-21).

(2)
(WDM 34-31-11, WDM 34-31-21).

E. Initial Evaluation
(1) Do
this
task:
ILS
or
Multi-Mode
Receiver
BITE
Procedure,
34-31
TASK
801.

(a)
If the maintenance message shows, then do the Fault Isolation Procedure below.

(b)
If the maintenance message does not show, then there was an intermittent fault.

F. Fault Isolation Procedure
(1) Replace the multi-mode receiver, M2104 (MMR-1) or M2105 (MMR-2), These are the tasks: Receiver for ILS -Removal, AMM TASK 34-31-42-000-801, Receiver for ILS -Installation, AMM TASK 34-31-42-400-801.
(a)
Do
this
task:
ILS
or
Multi-Mode
Receiver
BITE
Procedure,
34-31
TASK
801.

(b)
If the maintenance message does not show, then you corrected the fault.

-------------------------END OF TASK ---------------------------
815. ILS Tuning Port-B Missing Input -Fault Isolation
A. Description
(1)
The task is for this maintenance message:

(a) TUNING PORT-B MISSING INPUT

(2)
MMR receives no input data from the navigation control panel.

B. Possible Causes
(1)
Wiring problem.

(2)
Navigation control panel, P8-25 (captain’s) or P8-26 (first officer’s).

C. Circuit Breakers
(1) These are the primary circuit breakers related to the fault:
CAPT Electrical System Panel, P18-1
Row Col Number Name
A 2 C01479 RADIO NAVIGATION MMR 1
　
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