If the radio has been in storage long, take a can of canned air and blow all the dust off all of the tuner caps. That might help you hear something.
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I have an FRG-7 that was in storage for maybe 10 years and when I first turned it on, everything worked but it wouldn't tune anything.?
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Blowing out the dust from the preselector, MHz, and main tuner caps started it receiving.
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Also, exercise all the bandswitches.
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At least that would be a good start, if you haven't done those things already.
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Hope it helps.
