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There are some transistors attached to heatsinks (small heatsinks) on the left portion of the chassis. this board that has the input board attached to it is the signal board. those transistors are regulators they are labled 7809 or 7805 depeding if they are 9 or 5 volt regulators. use a multimeter to determine if one pin has 9v (or 5v) coming from it. if not this is your problem. i see alot 9v regulators going bad, some take the cap attached to the 3rd leg with it so check that too. if this sounds overwhelming it might be a job for a repair tech.