I have a Sony mini-disc player for my car that has been working great. for some reason the tuner went out recently. none of the radio stations are working. i know its not the antenna or adapter i tried another car stereo and it works fine. I never heard of a tuner going bad on a stereo. the cd player and MD works fine but it wont tune into a station. Is there any part or chip i can check inside the unit to fix it. please let me know at mike_vega63@yahoo.com thanks