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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
Do all continuity and resistance checks with all power removed.
4. Remove receiver module A4 (para 2-8).
Continuity
Go to 5.
Replace
Check continuity of relay K1 with
defective
MODE SELECTOR switch at positions
850 HZ and 85 HZ (fig. FO-8).
5. Replace module A4, set MODE SELECTOR
Input signal
Go to 6.
Replace
switch at 85 HZ DIVERSITY. Check for
present on
defective
signal continuity across terminal 1 of filter
AN/USM-281A
filter FL6
FL6 (fig. FO-8).
6. Set MODE SELECTOR switch at 850 HZ.
Input signal
--------------
Replace
Check for signal continuity across terminal
present on
defective
3 of filter FL7 (fig. FO-8).
AN/USM-281A
filter FL7
(14) NO CURRENT IN RECEIVE DC LOOP,
Defective: Meter function switch S3. Connector
MODEM IN MARK-HOLD CONDITION.
J7. Circuit board A8.
Do all continuity and resistance checks with all power removed.
1. Check continuity of METER FUNCTION
Continuity
Go to 2.
Replace
switch (fig. FO-8).
defective
switch S3
2. Connect ME-26B/U between pin A of
Continuity
Go to 3.
Replace
connector J7 and terminal 10 of board A8.
defective
Check for continuity.
connector J7
3. Connect ME-26B/U between pin C of
Continuity
Go to 4.
Replace
connector J7 and terminal 11 of board A8.
defective
Check for continuity.
connector J7
3-15

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