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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.
2. Remove module A4 (para 2-8).
Continuity
Go to 3.
Replace
Check continuity of relay K1 with MODE
defective
SELECTOR switch at positions 850 HZ
relay K1
and 85 HZ (fig. FO-8).
3. Replace module A4; set MODE SELECTOR
Input signal
Go to 4.
Replace
switch at 85 HZ DIVERSITY. Connect
present on
defective
TS-799AIUGM-1 (para 2-4) and test
AN/USM-281A
filter FL6
cable No. 3. Check for signal continuity
across terminal 1 of filter FL6 (fig. FO-8).
4. 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
(13) RCV LEVEL READING ON METER M1.
Defective: Mode selector switch S4. Filter FL4.
RECEIVE TTY MALFUNCTION
Relay K1. Filter FL6. Filter FL7.
Do all continuity and resistance checks with all power removed.
1. Check continuity of MODE SELECTOR
Continuity
Go to 2.
Replace
switch wafer S4D (fig. FO-8).
defective
switch S4
2. Set MODE SELECTOR switch at 85 HZ
Input signal
Go to 3.
Replace
DIVERSITY. Connect TS-799A/UGM-1 (para
present on
defective
2-4) and test cable No. 3. Check for
AN/USM-281
filter FL4
signal continuity across terminal 2 of filter
FL4 (fig. FO-8).
3. Check for signal continuity across terminal
Input signal
Go to 4.
Replace
4 of filter FL4 (fig. FO-8).
present on
defective
AN/USM-281
filter FL4
3-14

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