My 1982 Supra has an OEM Fujitsu Ten CE-4234-TL2 AM/FM sterio system. The radio has begun to sputter (motor boat) with little audio in the back ground. The condition started when the unit was turned on but now it alwas sputters and the only way to stop it is to dissconnect it? I would like a schematic to help trouble shoot it and or some advice as to what tha problem may be. Thanks. Graham. Engineering Electronis Tech.