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Pioneer SX 550 troubleshooting

Purchased a Pioneer SX-550 from a pawn shop for $25 bucks yesterday. Dusty as hell. Brought it home, cleaned it up, plugged it in. Lights! Hooked up a turntable. Barely audible static. Tried a cassette player in Tape One and Aux ports. Barely audible static. Tried the tuner. Signal strength meter works but only barely audible static. I'm sensing a trend here. Any ideas on troubleshooting?

Re: Pioneer SX 550 troubleshooting

Clean the tape monitor switch. Could be a dirty protection relay if it uses one.
BTW, the regulator (2SD313) can be a problem; they get hot.