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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
(7) MODEM NOT TRANSMITTING TTY
Defective: Filter FL1.
WITH MODE SELECTOR SWITCH AT 85
HZ, 85 DIVERSITY, OR 85 HZ +
VOICE.
1. Connect TS-799A/UGM-1 (refer to para 2-4)
3.5 mv rms
Go to 2.
Replace
and test cable No. 3. Connect ME-30/U
1.5
defective
across terminal 2 of FL1.
filter FL1
2. Connect ME-301U across terminal 4 of FL1.
3.5 mv rms
------------
Replace
1.5
defective filter
(8) MODEM NOT TRANSMITTING TTY
Defective: Filter FL2.
WITH MODE SELECTOR SWITCH AT
850 Hz.
Connect TS-799A/UGM-1 (refer to para 2-4)
3 mv rms
------------
Replace
and test cable No. 3. Connect ME-30/U
1
defective
across terminal 3 of FL2.
filter FL2
3-10

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