RCA/Radio Shack STA3850 Stereo Receiver - Need schematic

I have searched on the model number and found one post, about a transistor type in the receiver. In my case, the receiver simply quit in the middle of a song. The remote works, the relays click, but that's about it. I'd like to attempt a repair, but I'm lost w/o some information. Does anyone have a suggestion about where to get a schematic? Or in lieu of that, an approach that that might get me started? I have moderate electronics skills.