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Page Title:
MODEM BENCH TEST SETUP AND TEST CONDITIONS |
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 TM 11-5805-387-34-2
3-4. MODEM BENCH TEST SETUP AND TEST CONDITIONS
General support maintenance requires the same modem bench test setup and test conditions as for direct support
3-5. TROUBLESHOOTING SYMPTOM INDEX
Use this index to quickly find procedures in the troubleshooting chart.
TROUBLESHOOTING SYMPTOM
PROCEDURE NO.
PAGE
MODEM
Does not key transmitter
5
Does not transmit tty
7
(MODE SELECTOR switch 85 HZ, 85 HZ DIVERSITY,
85 HZ + VOICE)
Does not transmit tty
8
(MODE SELECTOR switch 850 HZ)
Does not transmit voice
17
Does not transmit voice
9
(MODE SELECTOR switch VOICE, 85 HZ +
VOICE)
Does not transmit voice or tty
6
Incorrect scope display
18
(all M1 indications except DISCRIMINATOR)
ON/OF F switch continues to trip
1
Receive tty malfunction
13
(RCV LEVEL reading)
MODEM TEST METER
Low or high REGULATED DC reading
4
No DISCRIMINATOR reading
12
(RCV LEVEL reading and abnormal scope
display)
No RCV LEVEL reading
11
(receive channel functioning)
No RCV LEVEL reading
10
(receive channel malfunctioning)
No reading
2
No receive DC LOOP current in mark-hold
14
condition
No send DC LOOP current
16
No 60 MA LOOP current
15
(with 20 MA LOOP current)
No + 20 volt dc reading
3
3-2
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