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TROUBLESHOOTING CHART (Cont)
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TM-11-5805-387-34-2 Modem Radion Teletypewriter MD-522A/RC (NSN
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TROUBLESHOOTING CHART (Cont)
TM 11-5805-387-34-2
MALFUNCTION/SYMPTOM
PROBABLE CAUSE
TEST PROCEDURE
INDICATION
YES
NO
(10) NO RCV LEVEL READING ON METER
Defective: One way-duplex switch S1. Circuit
M1. RECEIVE CHANNEL
board A6. Connector J1 or J2.
MALFUNCTIONING.
NOTE
There will be no RCV LEVEL indication when using test cable No. 3.
Do all continuity and resistance checks with all power removed.
1. Check continuity of ONE WAY/DUPLEX
Continuity
Go to 2.
Replace
switch (fig. FO-8).
defective
switch S1
2. Connect ME-26B/U between pin C of
Continuity
Go to 3.
Replace
connector J3 and terminal 7 of board A6.
defective
board A6
3. Connect ME-26B/U between pin C of
Continuity
Go to 4.
Replace
connector J2 and terminal 4 of board A6.
defective
board A6
4. Connect ME-26B/U between pin A of
Continuity
Go to 5.
Replace
connector J1 and terminal 12 of board A6.
defective
connector J1
5. Connect ME-26B/U between pin A of
Continuity
------------
Replace
connector J2 and terminal 16 of board A6.
defective
connector J2
3-12

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