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OPERATIONAL CHECK. - TM-11-5820-670-120051
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TM-11-5820-670-12 Radio Set AN/ARC-131(NSN
Next
REPAIR OR REPLACEMENT.


TM 11-5820-670-12
OPERATIONAL CHECK. (CONT)
3-12.
NOTE
If aircraft engines are operated during operational check, an authorized crewmember
will start and operate engines. If aircraft engines are not operated, use an auxiliary
power source to prevent excessive drain on aircraft battery. Refer to the applicable
aircraft manuals for connections and power requirements.
RESULT
ACTION
Control unit panel should light. If panel does not
a.
Perform starting procedures
a.
and two-way voice communica-
light, see troubleshooting (para 3-9) items 1 and 2.
tion in accordance with para-
Depress XMTR TEST pushbutton
b.
b.
Blower fan at rear of receiver-transmitter should run.
and key receiver-transmitter
If blower motor does not run, see troubleshooting
for a transmit operation.
Set TEST SWITCH to position
c.
c.
TEST METER should indicate regulated 24-volt dc
1 and observe TEST METER.
supply to radio set (TEST METER indicates this by
needle at center scale, 50 30). If not, see
troubleshooting (para 3-9) item 4.
Set TEST SWITCH to position
TEST METER should indicate 16-volt dc supply to low-
d.
d.
2 and observe TEST METER.
voltage transistor circuit (TEST METER indicates this
by needle at center scale, 50 30). If not, see
troubleshooting (para 3-9) item 4.
Set TEST SWITCH to position
TEST METER should indicate low on scale (20
e.
e.
3. Observe TEST METER. De-
10) unless a signal is being received on the tuned
press SQ DIS pushbutton and
channel. If not, see troubleshooting (para 3-9)
monitor headset to determine
item 4.
if another station is trans-
mitting on that frequency.
(TWO people may be required
for this check.)
Depress XMTR TEST pushbutton
f.
f.
TEST METER should indicate 80 10 on scale
and observe TEST METER.
indicating that transmitter oscillator and afc sys-
(Radio set must be receiving
tems are normal. If not, see troubleshooting (para
an fm signal to perform this
3-9) item 4.
check.)
TEST METER should indicate center scale (50
Set mode control switch on
g.
g.
10) if sufficient signal strength is being received.
control unit to HOME and ob-
serve TEST METER.
If not, see troubleshooting (para 3-9) item 4.
3-24


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