(2)
Navigation Control Panel, P8-25 (Captain) or P8-26 (F/O).

(3)
Display Electronic Unit (DEU), M1808 (No. 1) or M1809 (No. 2).

(4)
Wiring.

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:
ILS
or
Multi-Mode
Receiver
BITE
Procedure,
34-31
TASK
801.

(a)  
If the frequency show dashes on the captain’s or F/O’s displays, then do the Fault Isolation Procedure below.

(b)  
If the frequency do not shows dashes on the captain’s or F/O’s displays, then there was an intermittent fault.

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

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

(b)  
If the NAV control panel does display FAIL on the ACTIVE or STANDBY frequency indicators, then do these steps: 1) Replace the NAV control panel, P8-25 (Captain) or P8-26 (F/O). 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.

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

(2)  
Do this check of the display electronic unit (DEU):

(a)  
Do
this
task:
DEU
Self-Test
Procedure,
31-62
TASK
802.

(b)  
If the DEU shows FAILED, then do these steps:

EFFECTIVITY SIL ALL  34-31 TASK 810 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 214 Feb 15/2010 

1) Replace the DEU, M1808 (No. 1) or M1809 (No. 2). These are the tasks: Display Electronic Unit Removal, AMM TASK 31-62-21-000-801, Display Electronic Unit Installation, AMM TASK 31-62-21-400-801.
2) Do
this
task:
ILS
or
Multi-Mode
Receiver
BITE
Procedure,
34-31
TASK
801.
3) If the ILS frequency do not show dashes on the display, then you corrected the fault.
(c)  If the DEU shows PASSED, then continue.
SIL ALL; AIRPLANES WITH MULTI-MODE RECEIVERS (MMR)
(3)  Do this check of the wiring between the MMR and the NAV control panel:
(a)  
Remove the applicable Navigation Control Panel. To remove it, do this task: Navigation Control Panel Removal, AMM TASK 34-31-52-000-801.

(b)  
Remove the applicable 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 pins specified for the applicable MMR FAULT:

NAV  MMR 
CONNECTOR  CONNECTOR 
MMR 1  D303  D10719B 
pin 28  ------------------- pin J1 
pin 29  ------------------- pin K1 
MMR 2  D305  D10721B 
pin 28  ------------------- pin J1 
pin 29  ------------------- pin K1 
　
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