Quantcast NO CURRENT IN RECEIVE DC LOOP MODEM IN MARK-HOLD CONDITION.

 

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RECEIVE TTY MALFUNCTION
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TM-11-5805-387-34-2 Modem Radion Teletypewriter MD-522A/RC (NSN
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TUNING MALFUNCTION IN 850 HZ MODE
TM 11-5805-387-34-2
MALFUNCTION/SYMPTOM
PROBABLE CAUSE
NO
TEST PROCEDURE
INDICATION
YES
4. With receiver module A4 removed (para
Continuity
Go to 5.
Replace
2-8), 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
ANIUSM-281A
filter FL6
FL6 (fig. FO-8).
6. Set MODE SELECTOR switch at 850 HZ.
Input signal
Replace
Replace
Check for signal continuity across terminal
present on
defective
defective
3 of filter FL7 (fig. FO-8).
ANIUSM-281A
module A4
filter FL7
(11) NO CURRENT IN RECEIVE DC LOOP
Defective: Meter function switch S3. Receiver
MODEM IN MARK-HOLD CONDITION.
Module A4. Loop battery module A5.
Do all continuity and resistance checks with all power removed.
1. Check continuity of METER FUNCTION
Continuity
Go to 2.
Replace
switch S3 (fig. FO-8).
defective
switch S3
2-18

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