sansui sm-3000 schematic

[felicia]

i have a sansui sm-3000 i acquired free because it makes a whirring noise when hooked up. i am thinking it has a bad cap or resister or noise blocker or something that is going to require a walkthrough and a multimeter. i am thinking also that this is an old amp because i cant find a schematic no where, just wondering if anyone has one or knows what the problem might be, thanks in advance. i cant remember exactly but i am pretty sure it does the sound even with the car off. Also i have tested another amp with the same car, radio, speaker setup and it works fine.

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[Timmothy Web 10+ year member]

Got a picture of the board?