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MODEM NOT TRANSMITTING EITHER VOICE OR TTY.
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TM-11-5805-387-34-2 Modem Radion Teletypewriter MD-522A/RC (NSN
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MODEM NOT TRANSMITTING VOICE.
TM 11-5805-387-34-2
MALFUNCTION/SYMPTOM
PROBABLE CAUSE
TEST PROCEDURE
INDICATION
YES
NO
(6) MODEM NOT TRANSMITTING TTY.
Defective: Loop battery module A5. Transmitter
module A3.
1. Set METER FUNCTION switch to DC LOOP
Direct current
Go to 2.
Replace
NO. 1. Check test meter reading during
flow in dc loop
defective
transmission.
No. 1.
module A5
2. With TS-799A/UGM-1 and test cable no. 3
+0.6 vdc
Go to 3.
Replace
connected (para 2-4) connect
defective
ME-26B/U across SEND PULSE of loop
module A5
battery module A5.
3. Connect ME-26B/U across terminal 7 of
+22 vdc
Replace
Go to 4.
XA5; measure voltage.
defective
module A5
4. Connect ME-26B/U across terminal 11 of
+20 vdc
Replace
Go to 5.
XA5; measure voltage.
defective
module A5
5. With TS-799A/UGM-1 and test cable no. 3
------------
Replace
connected (para 2-4) make the
defective
following tests across test points of
module A3
transmitter module A3 (internal NORM/REV
switch at NORM) with the AN/USM-207:
221.0-KHZ OSC
221.0 kHz
227.8-KHZ OSC
227.8 kHz
OUTPUT (MODE SELECTOR switch at
SPACE: 2,425 Hz 25
850 HZ)
MARK: 1,575 Hz 25
OUTPUT (MODE SELECTOR switch at
SPACE: 2,847.5 Hz 2
85 HZ modes)
MARK: 2,762.5 Hz 2
OUTPUT (MODE SELECTOR switch at
200-2,400 Hz
VOICE)
MIXER OSC (MODE SELECTOR switch at
26,050 Hz
850 HZ)
MIXER OSC (MODE SELECTOR switch at
23,800 Hz
85 HZ DIVERSITY)
2-14

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