When I bought this one the left speaker didn’t work, but with some repetitive toggling of the line in/radio/tape selector I can persuade it to. Play function doesn’t work on the tape deck, but it does FF and REW. One thing I noticed was the REC. light was always on, with the button in or not, and what sounded like a motor running whenever it had AC power or batteries installed. I reached in to physically turn the capstan myself counter clockwise which made a click and the REC. light finally turned off. Now when I press play I can hear the same motor start and can stop it by, you guessed it, pressing stop. The head and pinch roller won’t raise up to engage a tape though.
In your opinions does this just sound like a belt problem? Or is it more mechanical than that? Will slowly and cautiously try to take it apart today. The only other box I’ve opened up is the RX-5150, which also has a sick deck. The play speeds fluctuate, usually starting at a normal speed and getting slower and slower while periodically screeching? Anyways, that’s a whole other post I’ll make another time. Pictures below!