737-600/700/800/900 FAULT ISOLATION MANUAL 故障隔离手册 导航(94)

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4)  If the flags does not show on the captain’s display, then you corrected the fault.
(e)  If there is continuity between the pins, then continue.
1)  Re-install the MMR-1, M2104. To install it, do this task: Receiver for ILS -Installation, AMM TASK 34-31-42-400-801.
2)  Re-install the DEU, M1808. To install it, do this task: Display Electronic Unit Installation, AMM TASK 31-62-21-400-801.
SIL ALL
(4) 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: 1) Replace the DEU, M1808.

EFFECTIVITY SIL ALL  34-31 TASK 806 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 207 Oct 10/2006 

 

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.

-------------------------END OF TASK ---------------------------
807.  LOC And G/S Flags Show On The F/O’s Display -Fault Isolation
A.  Description
(1)  The localizer (LOC) and glideslope (G/S) receiver functions have a failure.
B.  Possible Causes
(1)
MMR-2, M2105.

(2)  
VHF NAV switch S2, P5-28.

(3)
Wiring problem.

(4)
Display electronic unit (DEU), M1809.

C.  Circuit Breakers
(1)  This is the primary circuit breaker related to the fault:
F/O Electrical System Panel, P6-1
Row Col Number Name
A 13 C01480 RADIO NAVIGATION MMR 2

D.  Related Data
(1)
(SSM 34-31-21).

(2)
(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 flags show on the F/O’s display, then do the Fault Isolation below.

(b)  
If the flags do not show on the F/O’s display, then there was an intermittent fault.

F.  Fault Isolation Procedure
(1)  Do this task: Instrument Landing System -Operational Test, AMM TASK 34-31-00-710-801.
(a)  
If the flags show on the captain’s and F/O’s displays while the VHF NAV switch is in the BOTH ON 2 position, then do these steps: 1) Replace the MMR-2, M2105. 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.

2)  If the flags do not show on the captain’s and F/O’s displays, then you corrected the fault.

(b)  
If the flags show just on the captain’s or F/O’s displays, then do these steps: 1) Replace the VHF NAV switch S2, P5-28. 2) If the flags do not show on the captain’s and F/O’s displays, then you corrected the

fault.

EFFECTIVITY

34-31 TASKS 806-807
SIL ALL
Page 208 D633A103-SIL Oct 10/2006

3)  If the flags show on the captain’s or F/O’s displays, then continue.
(c)  If the flags only show on the F/O’s display while the VHF NAV switch is in the BOTH ON 2 position, then continue.
(2) Do this check of the wiring between the VHF NAV switch and the DEU, M1809:
(a)  
Set the VHF NAV switch to the BOTH ON 2 position.

(b)  
Remove the DEU, M1809. To remove it, do this task: Display Electronic Unit Removal, AMM TASK 31-62-21-000-801.

(c)  
Do a continuity check between pin G10 of the connector D3975B and structure ground.

(d)  
　
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