Symptom:
Any of the following: Cannot change band to UHF, no UHF volume or squelch control, no UHF tuning, or strange-sounding beep tone.
Cure:
Rework bad soldering at J3 on display unit and replace the SW-B board with a factory-modified flex PC board.
Symptom:
No audio output from receiver.
Cure:
Remove excessive solder on the Main-A unit near the audio amp.
Symptom:
Howling if volume is turned up when using UHF.
Probable Cause:
Microphonics in VCO section. Resolder the ground spring at the UHF VCO shield. You may also add a second spring for further improved resistance to microphones.
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