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Sorry to hear of your difficulty. There are a few things which come to mind. First, if you have only two radios, check the good radio to see if anything is plugging or covering the mic hole. Then if the good radio is not the problem, check the bad radio for debris or something covering the speaker holes. If this does not reveal a problem, the next issues are possible, but not resolveable: You either have a bad volume potentiometer (internal volume device) or your speaker is bad.