NAV MMR CONNECTOR CONNECTOR CAPTAIN (P8-25) D303 D10719B
pin28 -------------------pinJ1 pin29 -------------------pinK1
FIRST OFFICER D305 D10721B
(P8-26)
pin28 -------------------pinJ1 pin29 -------------------pinK1
(d) If there is not continuity, then do these steps: 1) Repair the wiring. 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 localizer and glideslope pointers show on the captain’s or F/O’s displays, then
you corrected the fault.
(e) If there is continuity, 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.
EFFECTIVITY SIL ALL 34-31 TASK 809
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(3) Use a time domain reflectometer (TDR) test set to do an electrical check of the coaxial cable and antenna:
CAUTION: YOU MUST PUT RF ABSORBENT MATERIAL ON THE ANTENNA BEFORE YOU USE THE TDR TEST SET. YOU CAN DAMAGE THE TEST SET IF A HIGH POWER TRANSMITTER OPERATES WITHIN 500 FEET OF THE ANTENNA.
(a)
Cover the applicable MMR antenna with RF absorbent material.
(b)
Connect the TDR test set at pins 13 and C13 of connector D10719C or D10721C as applicable at the MMR receiver (WDM 34-31-11).
(c)
Do an electrical check of the coaxial cable and the antenna.
LOCALIZER TDR TEST SET TDR --------------------TDR -------------------- MMR CONNECTOR D10719C pin 13 pin C13
GLIDE/SLOPE TEST SET TDR --------------------TDR -------------------- D10719C pin 12 pin C12
NOTE: The TDR test set has instructions which tell how to do the check of the cable and antenna.
(d)
Disconnect the TDR test set.
(e)
Re-install the MMR. To install it, do this task: Receiver for ILS -Installation, AMM TASK 34-31-42-400-801.
(f)
If you find a problem with the coaxial cable, then do these steps: 1) Replace the coaxial cable (WDM 34-31-11). 2) Do
this
task:
ILS
or
Multi-Mode
Receiver
BITE
Procedure,
34-31
TASK
801.
3) If the localizer and glideslope pointers show on the captain’s or F/O’s displays, then
you corrected the fault.
(g) If you find a problem with the antenna, do these steps:
1) Replace the MMR antenna, M40 (G/S) or M1102 (LOC). 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.
3) If the localizer and glideslope pointers show on the captain’s or F/O’s displays, then you corrected the fault.
SIL ALL -------------------------END OF TASK ---------------------------
EFFECTIVITY SIL ALL 34-31 TASK 809
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810. ILS Frequency Shows Dashes -Fault Isolation
A. Description
(1) There are no computed data (NCD) for the ILS frequency.
B. Possible Causes
(1)
MMR-1, M2104 or MMR-2, M2105.
