FAILURES, then you corrected the fault.

(h)  
If you find a problem with the antenna, then do these steps:

1) Replace the ILS GS antenna, M40. These are the tasks: ILS Glide Slope Antenna Removal, AMM TASK 34-31-21-000-801, ILS Glide Slope Antenna Installation, AMM TASK 34-31-21-400-801.
2) Do
this
task:
ILS
or
Multi-Mode
Receiver
BITE
Procedure,
34-31
TASK
801.

EFFECTIVITY SIL ALL  34-31 TASK 817 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 227 Feb 15/2010 

3)  If the LCD display on the multi-mode receiver shows MMR TEST COMPLETE NO FAILURES, then you corrected the fault.
-------------------------END OF TASK ---------------------------
SIL ALL
818. MMR No Response to TEST Switch -Fault Isolation
A.  Description
(1) MMR does nothing when you push the TEST switch.
B.  Possible Causes
(1)
MMR-1, M2104 or MMR-2, M2105.

(2)
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 MMR does nothing, then do the Fault Isolation Procedure below.

(b)
If the MMR indicates that there are no fault, 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 MMR indicates that there are no fault, then you corrected the fault.

EFFECTIVITY

34-31 TASKS 817-818
SIL ALL
Page 228 D633A103-SIL Feb 15/2010

(c)  If the MMR does nothing, then continue.
(2) Do this check of the wiring between the MMR and the MMR circuit breaker:
(a)  
Remove the applicable MMR. To remove it, do this task: Receiver for ILS -Removal, AMM TASK 34-31-42-000-801.

(b)  
Do a continuity check between the specified pins for the applicable MMR FAULT:

MMR CIRCUIT  MMR
BREAKER  CONNECTOR

MMR 1 C1479  D10719C
pinA2 ------------------pin9

MMR 2 C1480  D10721C
pinA13 -----------------pin9

(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) Do
this
task:
ILS
or
Multi-Mode
Receiver
BITE
Procedure,
34-31
TASK
801.
4) If the MMR indicates that there are no fault, then you corrected the fault.
(d)  If there is continuity between the pins, then continue.
1) Replace these applicable circuit breakers:

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
　
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