(a)  If the ILS, GLS and GPS lights do not come on, on the IRS Mode Select Unit, then you corrected the fault.
-------------------------END OF TASK ---------------------------
824. ILS, GLS and GPS Lights All Come On When Master Caution Pushed -Fault Isolation
A.  Description
(1)  The ILS, GLS and GPS lights come on, on the IRS Mode Select Unit, when the RECALL annunciator on the IRS Master Caution Unit is pushed.
B.  Possible Causes
(1)  
Multi-Mode Receiver (MMR-1), M2104 or (MMR-2), M2105.

(2)  
IRS Mode Select Unit, P5–69.

(3)  
IRS Master Caution Unit, M1206.

(4)  
GPS antenna connection (M2102), D2947 or (M2103), D2941.

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 34-58-11).

(2)
(SSM 34-58-21).

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

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

(5)
(WDM 34-58-11).

(6)
(WDM 34-58-21).

E.  Initial Evaluation
(1)  Do
this
task:
ILS
or
Multi-Mode
Receiver
BITE
Procedure,
34-31
TASK
801

(a)  If the ILS, GLS and GPS lights come on, on the IRS Mode Select Unit, when the RECALL annunciator on the IRS Master Caution Unit is pushed, then do the Fault Isolation Procedure below.
EFFECTIVITY

34-31 TASKS 823-824
SIL ALL
Page 241 D633A103-SIL Jun 15/2010

(b)  If the ILS, GLS and GPS lights do not come on, on the IRS Mode Select Unit, when the RECALL annunciator on the IRS Master Caution Unit is pushed, then there was an intermittent fault.
F. Fault Isolation Procedure
(1)
Replace the MMR, (M2104 and M2105).
These are the tasks:
AMM TASK 34-31-42-000-801
AMM TASK 34-31-42-400-801

(a)  
If the ILS, GLS and GPS lights do not come on, on the IRS Mode Select Unit, when the RECALL annunciator on the IRS Master Caution Unit is pushed, then you corrected the fault.

(b)  
If the ILS, GLS and GPS lights come on, on the IRS Mode Select Unit, when the RECALL annunciator on the IRS Master Caution Unit is pushed, then continue.

(2)
Do this check of the wiring:

(a)  
Remove the MMR. To remove it, do this task: AMM TASK 34-31-42-000-801.

(b)  
Do a MMR continuity check:

MMR A/C CONNECTOR REFERENCE D10719B DC Ground
pinD5 ------------------DCGround =<10Ohms pinD7 ------------------DCGround =<10Ohms pinH5 ------------------DCGround =<10Ohms pinJ5 -------------------DCGround =<10Ohms
MMR MMR CONNECTOR CONNECTOR D10719B D10719B
pinB5 ------------------pinK4 >100KOhms
MMR A/C CONNECTOR REFERENCE D10721B DC Ground
pinD5 ------------------DCGround =<10Ohms pinD7 ------------------DCGround =<10Ohms pinH5 ------------------DCGround =<10Ohms pinJ5 -------------------DCGround =<10Ohms
MMR MMR CONNECTOR CONNECTOR D10721B D10721B
pinB5 ------------------pinK4 >100KOhms

(c)  If the result is not as expected, then do these steps: 1) Repair the wiring. 2) Re-install the MMR. To install it, do this task: AMM TASK 34-31-42-400-801.
EFFECTIVITY SIL ALL  34-31 TASK 824 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 242 Jun 15/2010 

 
　
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