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NO RCV LEVEL READING ON METER M1. RECEIVE CHANNEL MALFUNCTIONING
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TM-11-5805-387-34-2 Modem Radion Teletypewriter MD-522A/RC (NSN
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NO CURRENT IN RECEIVE DC LOOP MODEM IN MARK-HOLD CONDITION.
TM 11-5805-387-34-2
MALFUNCTION/SYMPTOM
PROBABLE CAUSE
TEST PROCEDURE
INDICATION
YES
NO
(9) RCV LEVEL READING ON TEST METER,
Defective: Circuit board A7.
BUT NO DISCRIMINATOR READING.
ABNORMAL SCOPE DISPLAY.
Set MODE SELECTOR switch to 850 HZ.
Input signal
-----------
Replace
Check for signal continuity across terminal
present
defective
8 or 9 of board A7 (fig. FO-8).
board A7
(10) RECEIVE TTY MALFUNCTION
Defective: Mode selector switch S4. Filter FL4.
Relay K1. Filter FL6. Filter FL7.
Recover module A4.
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. Connect TS-799A/UGM-1 (para 2-4)
and test cable No. 3.
Set MODE SELECTOR switch to 85 HZ
Input signal
Go to 3.
Replace
DIVERSITY. Check for signal continuity
present on
defective
across terminal 2 of filter FL4 (fig.
AN/USM-281A
filter FL4
3. Check for signal continuity across terminal
Input signal
Go to 4.
Replace
4 of filter FL4.
present on
defective
ANIUSM-281A
filter FL4
2-17

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