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| ![]() TM 11-5820-670-12
TROUBLESHOOTING PROCEDURES. (CONT)
3-9.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
If grounding and aircraft intercommunications system is checked and found
Step 3.
operating, receiver-transmitter is defective.
Remove and replace receiver-transmitter (para 3-11).
10. Squelch does not operate properly.
Step 1.
Check SQ ADJ on receiver-transmitter for proper setting,
Adjust SQ ADJ (para 3-4).
Step 2.
If adjusting SQ ADJ on receiver-transmitter does not correct malfunction,
receiver-transmitter or control unit is defective.
Remove and replace receiver-transmitter (para 3-11).
Step 3.
If squelch does not operate after replacement of receiver-transmitter, control
unit is defective.
Remove and replace control unit (para 3-11).
11. Radio set will receive but will not transmit.
Check settings on control unit for correct transmit/receive operation. If all settings are
correct, receiver-transmitter is defective.
Remove and replace receiver-transmitter (para 3-11).
12. Radio set will transmit but will not receive.
Step 1.
If signal can be heard with control unit SQUELCH control set at DIS but not at
CARR, check squelch adjustments (SQ ADJ) on receiver-transmitter.
Adjust SQ ADJ (para 3-4).
Step 2.
Check aircraft intercommunications system for discrepancies.
Refer to applicable aircraft electronic maintenance manual for checks
and corrective action.
Step 3.
Reset all controls on control unit for transmit/receive operation. If radio set still
does not receive, receiver-transmitter is defective.
Remove and replace receiver-transmitter (para 3-11).
3-19
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