Sony Beta SL-5200 Doesn't Do Anything

[ESigma25]

I recently got a Sony SL-5200 Beta Hi-Fi deck that seems to have some problems. Tapes will not play or fast-forward (pressing each button does nothing at all), rewind at least tries. Sometimes the tape even gets stuck trying to eject and I have to push a plastic wheel against a rubber idler on the right side to force the tape to thread back into the cassette. The belts on this machine seem fine but is this behavior a sign they aren't as fine as they seem?