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 TM 11-6625-1635-12
C1
Checks and corrective
Trouble symptom
measures
Probable trouble
(1) Test panel 5 Vac power
Set POWER switch to ON.
POWER switch set to OFF
Defective lamp. . . . . . . .
indicator lamp fails to
Replace lamp (para 3-13a).
light.
Defective 250 V 1A fuse
Replace fuse (para 3-13b).
(2) Test panel 27.5 Vdc
Defective 250 V 10A fuse
Replace fuse (para 3-13b).
POWER indicator lamp
Defective lamp. . . . . . .
Replace lamp (para 3-13a).
fails to light.
(3) AN/ARC-134 meter does
Set VHF COMM OFF PWR switch
VHF COMM OFF-PWR switch is at
to PWR. Set meter switch to LINE
not indicate 27.5 volts dc
OFF.
(-20 +10%).
V.
AN/ARC-134 meter switch not set
to LINE V.
(4) Radio control panel lamps
Radio control panel lamps defective.
Replace lamps (para 3-13c).
do not light.
Replace lamps (para 3-13d).
(5) VHF COMM frequency
Defective frequency counter dial
lamps.
counter
dials
not
illuminated.
b. Maintenance kit modified.
Checks and corrective
measures
Probable trouble
Trouble symptom
Replace fuse (para 3-13b).
(1) Test panel 28.7 Vdc B+
Defective 250 V 10A fuse
POWER indicator lamp
fails to light.
Replace lamp (para 3-13a).
(2) AN/ARC-134 meter does
Defective lamp VHF COMM OFF-
Set VHF COMM OFF-PWR switch
not indicate 27.5-volts dc
PWR switch is OFF.
(-20 +10%).
to PWR.
AN/ARC-134 meter switch not set
Set meter switch to LINE V.
to LINE V.
Replace lamps (para 3-l3c).
Defective panel lamps.
(3) Radio control or intercom
control panel lamps do not
light.
Replace lamps (para 3-13d).
Defective frequency counter dial
(4) VHF COMM frequency
lamps.
counter d i a l s d o n o t
illuminate.
3-13. Repairs
(1) Rotate lampholder (fig. 3-1) coun-
terclockwise until it separates from the test
a. Replacement of
T e s t Panel POWER
panel.
Indicator Lamps.
3-5
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