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I've got the non-HiFi model that Sony made for Zenith. Belt and idler slip and lack of lube on the threading mech can be issues, but these have electronic issues too.
The most common issue is the light blue sanyo caps going bad and causing the capstan to not run or be off speed. Those caps are between .1 and 1uF so I replaced mine with film caps instead of electrolytics and it works well (those film caps should last longer too).
Another issue is some of the switching transistors that control which mode (play, ff, rw, pause, record, stop, eject) the deck is in and what motors are running can fail...That happened on my deck and I had to buy the sams to figure out the circuit and troubleshoot it and I did get it working.
If you feel up to trying to understand the electronics I can email you my Sam's.
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