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|  TM 11-5821-277-20
Probable trouble
Remove and replace control unit (para
Primary power shorted in control unit
Aircraft 27.5-volt dc circuit
2
416). If trouble is not corrected.
or transceiver.
breaker opens when control
remove and replace transceiver
unit OFF-PWR switch in
set to PWR.
If trouble is not corrected refer to
higher category maintenance for check
of aircraft wiring connecting control
unit and mounting.
Replace transceiver (para 4-17).
Defective blower motor -----------------
Transceiver blower does not
8
operate when push-to-talk
switch is pressed (radio ant
operates properly other-
wise) .
Replace transceiver (pare 4-17).
Transceiver circuitry ---------------------
4
Monitor meter indications are
abnornmal.
a. Tighten setscrews that secure tuning
a. Tuning controls loose on mounting
Tuning controls do not op-
5
controls to their respective mount-
shaft.
erate VHF COMM fre-
ing shafts. Replace if necessary
quency indicator as speci-
fied.
b. Replace control unit (para 4-16).
b. Control unit defective ------------
a. Replace control unit (para 416).
a Control unit defective ------------
Radio set will not tune to se-
6
lected frequency (tuning
controls operate properly).
b. Replace transceiver (para 4-17)
b. Transceiver defective ------------
c. Refer to higher category maintenance
C. Interconnecting cabling ----------
for isolation and repair of defective
cabling.
a. Remove control unit from instrument
a. Connectors not securely mated ----
7
Radio set inoperative (air-
panel (para 4-16) and check to
craft circuit breaker sup-
see that aircraft wiring harness
plying power to radio set
connector is securely mated with
energized).
connector J1 at rear of control
unit. Also check to see that con-
nectors on transceiver and mount-
ing are securely mated.
b. Replace control unit (pars 4-16).
b. Control unit OFF-PWR is defective
a. Connect headset and microphone di-
8
a. Aircraft C1611D/AIC defective ---
Radio set transmits but no
rectly to PHONE and MIKE jacks
sidetone signal heard in
on transceiver and operate radio
headset.
set. If equipment operates properly,
trouble is isolated to aircraft C-
1611D/AIC. Refer C-1611D/AIC
to higher category maintenance re-
pair.
b. Replace transceiver (para 4-17).
b. Transceiver defective ------------
a. Connect headset and microphone di-
9
Radio set operates properly
a. Aircraft C-1611D/AIC defective __
rectly to transceiver and operate
in mode but will not trans-
mit,
radio set. If equipment operates
properly, trouble is isolated to air-
craft C-1611D/AIC. Refer C-
1611D/AIC to higher category
maintenance for repair.
b. Replace transceiver (para 4-17),
b. Transceiver defective ------------
10
Radio set operates properly
a. Transceiver squelch control not
a. Press COMM TEST switch on control
in transmit mode but will
properly adjusted.
unit during periods of signal recep-
not receive.
ion. If signal is received, squelch
control is not properly adjusted.
Replace the transceiver (pare
4-17).
b. Aircraft C-1611D/AIC defective ---
b. Connect headset to PHONE jack on
transceiver. If audio is received,
trouble is isolated to the aircraft
C-1611D/AIC. Refer C-1611D/
AIC to higher category mainte-
nance for repair.
c. Transceiver defective -------------
c. Replace transceiver (para 4-17).
4-8
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