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Hi, my name is John. Try a external speaker, plug it in the back of radio, turn the RF GAIN to MAX. Turn the SQUELCH all the way to left, make sure the select knob is on CB, and on AM...try all this and if that's does not do it, let me know, I will post other steps here,.... hope this was very helpful....
adjusting the receive is something you don't want to touch unless you know a radio.....and for the rci2990 without looking at it I'd say you have a bad soilder on the voltage regulaor or the voltage reg, died.
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