NO leave the VCO alone its not the problem SQ thershold setings maybe the the cause check the manual if you have it
I think you can have problems with the speaker, if you see the signal display working when you reiceve the VCO is working. If you could check (I dont remeber if this radio has audio connectors) external speaker. If this radio has an audio conector, this conector switches the internal and external speaker and could be dirt and is not switching to the internal spk.
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