(2)
The MMR has an internal failure.

B. Possible Causes
(1) Multi-Mode Receiver, M2104 (No. 1) or M2105 (No. 2).
C. Circuit Breakers
(1) This is the primary circuit breaker related to the fault:
CAPT Electrical System Panel, P18-1
Row Col Number Name
A 2 C01479 RADIO NAVIGATION MMR 1

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

(2)
(SSM 34-31-21).

(3)
(WDM 34-31-11).

(4)
(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 red LRU STATUS light comes on after approximately 15 seconds, then do the Fault Isolation Procedure below.

(b)  
If the green LRU STATUS light comes on after approximately 15 seconds, then there was an intermittent fault.

F. Fault Isolation Procedure
(1) Replace the MMR, M2104 (No. 1) or M2105 (No. 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)  If the green LRU STATUS light comes on after approximately 15 seconds, then you corrected the fault.
-------------------------END OF TASK ---------------------------
813. ILS Tuning Port-B Missing Input -Fault Isolation
A. Description
(1) The task is for this maintenance message:
(a)  CONTROL FAIL
EFFECTIVITY

34-31 TASKS 812-813
SIL ALL
Page 219 D633A103-SIL Jun 15/2010

(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)  This is the primary circuit breaker related to the fault:
CAPT Electrical System Panel, P18-1
Row Col Number Name
A 2 C01479 RADIO NAVIGATION MMR 1

D.  Related Data
(1)
(SSM 34-31-11).

(2)
(SSM 34-31-21).

(3)
(WDM 34-31-11).

(4)
(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 red CONTROL FAIL light comes on after approximately 15 seconds, then do the Fault Isolation Procedure below.

(b)  
If the green LRU STATUS light comes on after approximately 15 seconds, then there was an intermittent fault.

F.  Fault Isolation Procedure
(1)  
Do this check of the navigation control panel:

(a)  
Make sure that the navigation control panel does not display FAIL on the ACTIVE or STANDBY frequency indicators.

(b)  
If the navigation control panel display FAIL on the ACTIVE or STANDBY frequency indicators, then do these steps: 1) Replace the navigation control panel, P8-25 (captain’s) or P8-26 (first officer’s). These are the tasks: Navigation Control Panel Removal, AMM TASK 34-31-52-000-801, Navigation Control Panel Installation, AMM TASK 34-31-52-400-801. 2) Do
this
task:
ILS
or
Multi-Mode
Receiver
BITE
Procedure,
34-31
TASK
801.

3)  If the green LRU STATUS light comes on after approximately 15 seconds, then you corrected the fault.

(c)  
If the navigation control panel does not display FAIL on the ACTIVE or STANDBY frequency indicators, then continue.

(2)  
Do this check of the wiring:

EFFECTIVITY SIL ALL  34-31 TASK 813 
　
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