TM 55-1510-221-MTF
TROUBLESHOOTING GUIDE K -
COMMUNICATION/NAVIGATION EQUIPMENT
CONDITION
PROBABLE CAUSE
K1.
Interphone system: No audio signals heard in headset.
a.
No power to audio system.
b.
Defective microphone, control wheel microphone switch, or
foot microphone switch.
c.
Defective headset-microphone cord or jack.
d.
Defective microphone jack.
e.
Defective audio control panel.
K2.
Interphone system: Audio signals can be heard at other
headset stations when transmitter selector switches at
audio control panels are at different positions and receiver
monitor switches are pulled out.
a.
Defective audio control panel.
b.
Defective wiring.
K3.
UHF VOL control has no effect on receiver
noise or
incoming signal.
a.
Defective UHF command set
K4.
UHF channeling tone not heard.
a.
Defective UHF command set
K5.
UHF squelch switch has no effect on receiver noise.
a.
Defective UHF command set.
b.
Defective static wicks
K6.
UHF guard receiver noise not audible.
a.
Defective UHF command set
K7.
Cannot establish UHF two-way communications.
3-30
