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Section IV TROUBLESHOOTING
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TM-11-5820-670-12 Radio Set AN/ARC-131(NSN
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TROUBLESHOOTING PROCEDURES-continued - TM-11-5820-670-120046


TM 11-5820-670-12
3-9. TROUBLESHOOTING PROCEDURES. (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. Blower fan at rear of receiver-transmitter does not operate when radio set is turned on and
receiver-transmitter is keyed to transmit.
Turn radio set off, check/reset circuit breaker, and turn radio set back on and key
transmitter. If blower fan does not operate, blower motor is defective.
Remove and replace receiver-transmitter (para 3-11).
4. Receiver-transmitter TEST METER reading is not within tolerances as specified in operational
Turn radio set on, rotate TEST SWITCH to six positions, and determine out of tolerance
readings. If readings are not as specified, receiver-transmitter is defective.
Remove and replace receiver-transmitter (para 3-11).
5. Frequency selector switches do not work properly.
Manually turn frequency selector switches on control unit, checking for smooth operation.
If switches do not work smoothly and do not properly set frequency, control unit is defective
or frequency selector switch knobs are loose.
Check knobs for security of attachment. Tighten or replace knobs as
necessary. If necessary, remove and replace control unit.
6. With frequency selector switches on control unit working properly, radio set does not tune to
desired frequency.
Step 1.
Set frequency selector switches to desired frequency and check that desired
frequency has been selected. If frequency set is not achieved, receiver-
transmitter or control unit is defective.
Remove and replace receiver-transmitter (para 3-11).
Step 2.
After replacing receiver-transmitter, check frequency selected with frequency
obtained. If frequencies do not agree, control unit is defective.
Remove and replace control unit (para 3-11).
3-17


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