TM 55-1510-222-MTF
TROUBLESHOOTING GUIDE K -
COMMUNICATION/NAVIGATION EQUIPMENT
K1.
K2.
K3.
K4.
K5.
K6.
K7.
K8.
Interphone system: No audio signals heard in
headset.
a. No power to audio system.
b. Defective microphone, control wheel micro-
phone switch, or foot microphone switch.
c. Defective headset-microphone cord or jack.
d. Defective microphone jack.
e. Defective audio control panel.
Interphone system: Audio signals can be heard
at other headset stations when transmitter selec-
tor switches at audio control panels are at differ-
ent positions and receiver monitor switches are
pulled out.
a. Defective audio control panel.
b. Defective wiring.
UHF VOL control has no effect on receiver
noise or incoming signal.
a. Defective UHF command set.
UHF channeling tone not heard.
a. Defective UHF command set.
UHF squelch switch has no effect on receiver
noise.
a. Defective UHF command set.
b. Defective static wicks.
UHF guard receiver noise not audible.
a. Defective UHF command set.
Cannot establish UHF two-way communications.
a. Defective audio distribution channels.
b. Defective antenna or antenna cabling.
Cannot establish VHF two-way communications.
3-30
