(c)
Do a continuity check between these pins of connector D3623B for the VOR/marker beacon receiver and connector D2501A for the remote electronics unit:
D3623B D2501A
pinC4 ------------------pinA15 pinD4 ------------------pinA14
(d)
If there is not continuity, then do these steps: 1) Repair the wiring. 2) Re-install the remote electronics unit. To install it, do this task: Remote Electronics
Unit (REU) Installation, AMM TASK 23-51-01-000-802. 3) Re-install the VOR/marker beacon receiver. To install it, do this task: VOR/MKR Receiver Installation, AMM TASK 34-51-01-400-801. 4) Do this task: Marker Beacon System -System Test, AMM TASK 34-32-00-730-801. a) If the audio tone is normal, then you corrected the fault for the audio tone, continue for the indications problem.
(e)
If there is continuity, then do this step and continue:
1) Re-install the remote electronics unit. To install it, do this task: Remote Electronics Unit (REU) Installation, AMM TASK 23-51-01-000-802.
(4) Do this check of the wiring between the DEU and the VOR/marker beacon receiver:
(a)
Remove the applicable DEU, M1808 (No. 1) or M1809 (No. 2). To remove it, do this task: Display Electronic Unit Removal, AMM TASK 31-62-21-000-801.
(b)
Remove the VOR/marker beacon receiver, M1724. To remove it, do this task: VOR/MKR Receiver Removal, AMM TASK 34-51-01-000-801.
(c)
Do a continuity check between these pins of connector D3623B for the VOR/marker beacon receiver (VOR 1) and the connector for the DEU:
EFFECTIVITY SIL ALL 34-32 TASK 802
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 203 Jun 15/2009
DEU VOR
CONNECTOR CONNECTOR
DEU 1 D3973B D3623B
pin C3 ------------------ pin B13
pin D3 ------------------ pin C13
DEU 2 D3975B D3623B
pin C3 ------------------ pin B13
pin D3 ------------------ pin C13
(d) If there is not continuity, th en do these steps:
1) Repair the wiring.
2) Re-install the VOR/marker beacon receiver. To install it, do this task: VOR/MKR Receiver Installation, AMM TASK 34-51-01-400-801.
3) Re-install the DEU. To install it, do this task: Display Electronic Unit Installation, AMM TASK 31-62-21-400-801.
4) Do this task: Marker Beacon System -System Test, AMM TASK 34-32-00-730-801.
a) If the indications are normal, then you corrected the fault for the indications problem.
(e) If there is continuity, then do these steps and continue:
1) Re-install the VOR/marker beacon receiver. To install it, do this task: VOR/MKR Receiver Installation, AMM TASK 34-51-01-400-801.
2) Re-install the DEU. To install it, do this task: Display Electronic Unit Installation, AMM TASK 31-62-21-400-801.
(5) Do this check of the display electronics unit (DEU) if there are still indications problem:
(a)
For
the
applicable
DEU,
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 (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: Marker Beacon System -System Test, AMM TASK 34-32-00-730-801. a) If the indications are normal, then you corrected the fault.
(6) Replace the remote electronics unit, M1353 if there are still audio tone problems. These are the tasks: Remote Electronics Unit (REU) Removal, AMM TASK 23-51-01-000-801, Remote Electronics Unit (REU) Installation, AMM TASK 23-51-01-000-802.
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