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 TM 1-1510-223-MTF
h.
Headset-oxygen mask switch set in wrong position.
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 control panel.
K4.
UHF channeling tone not heard.
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.
Defective UHF command set.
K7.
Cannot establish UHF two-way communications.
a.
Defective audio distribution channels.
b.
Defective antenna or antenna cabling.
c.
Defective UHF command set.
K8.
Cannot establish VHF two-way communications.
a.
Defective audio distribution channels.
b.
Defective antenna or cabling.
c.
Defective VHF command set.
K9.
VHF volume control does not affect received audio level.
a.
Defective VHF control panel.
b.
Defective antenna or antenna cabling.
3-26
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