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 ILS frequency do not show dashes on the display, then you corrected the fault.
(e)  If there is continuity between the pins, then continue.
1)  Re-install the Navigation Control Panel. To install it, do this task: Navigation Control Panel Installation, AMM TASK 34-31-52-400-801.
(4)  Do this check of the wiring between the DEU and the MMR:
(a)  Remove the applicable DEU. To remove it, do this task: Display Electronic Unit Removal, AMM TASK 31-62-21-000-801.
EFFECTIVITY SIL ALL  34-31 TASK 810 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 215 Feb 15/2010 

(b) Do a check for an open circuit between the pins specified for the applicable MMR FAULT:

MMR 1  DEU CONNECTOR D3973A pin C15 -----------------pin D15 ----------------- MMR CONNECTOR D10719B pin G1 pin H1 
D3973E pin G3 ------------------pin H3 ------------------ D10719B pin G1 pin H1 
D3975A pin C15 pin D15  ---------------------------------- D10719B pin G1 pin H1 
D3975E pin G3 ------------------pin H3 ------------------ D10719B pin G1 pin H1 
MMR 2  D3973D pin C15 pin D15  ---------------------------------- D10721B pin G1 pin H1 
D3973E pin G3 ------------------pin H3 ------------------ D10721B pin G1 pin H1 
D3975D pin C15 pin D15  ---------------------------------- D10721B pin G1 pin H1 
D3975B pin G3 ------------------pin H3 ------------------ D10721B pin G1 pin H1 
(c)  If there is an open circuit, then do these steps: 
1) Repair the wiring. 

2)  Re-install the MMR. To install it, do this task: Receiver for ILS -Installation, AMM TASK 34-31-42-400-801.
3)  Re-install the DEU. To install it, do this task: Display Electronic Unit Installation, AMM TASK 31-62-21-400-801.
4)  Do
this
task:
ILS
or
Multi-Mode
Receiver
BITE
Procedure,
34-31
TASK
801.

5)  If the ILS frequency do not show dashes on the display, then you corrected the fault.
SIL ALL -------------------------END OF TASK ---------------------------
EFFECTIVITY SIL ALL  34-31 TASK 810 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 216 Feb 15/2010 

811. Audio Tone Problem -Fault Isolation
A. Description
(1)  Audio tone does not occur or is weak.
B. Possible Causes
(1)
MMR-1, M2104 or MMR-2, M2105.

(2)  
Remote electronics unit (REU), M1353.

(3)
Wiring.

(4)  
Nose Radome moisture.

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

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).

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

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

(4)
(WDM 34-31-21).

E. Initial Evaluation
(1)  Do this task: Instrument Landing System -System Test, AMM TASK 34-31-00-730-801.
　
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