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 TM 11-5805-387-34-2
MALFUNCTION/SYMPTOM
PROBABLE CAUSE
TEST PROCEDURE
INDICATION
YES
NO
(7) MODEM NOT TRANSMITTING VOICE.
Defective: Mode selector switch S5. Connectors J3, J4, J2.
50-ohm mike keying circuitry.
Filter FL3.
Transmitter module A3.
Do all continuity and resistance checks with all power removed.
1. Check continuity of MODE SELECTOR
Continuity
Go to 2.
Replace
switch wafers S4B, S4C, S4G (fig.
defective
switch S4
2. Check continuity of connector J3 (local
Continuity
Go to 3.
Replace
operation), connectors J4 or J2 (remote
defective
connector
2-15
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