Don't waste time on the Sony site as you will find many, many outdated links. Best way to solve is replace as the processor's needed are long gone.
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I had several of them , they were good tables. About 1970 when they were current I decided to get another arm board, I couldn't find any so I went out to the huge Sony distribution center , in Queens I think. They looked all over the warehouse for some and finally found one, which they gave to me as they had no idea of the price and they said they would never get another one anyway. If that was their attitude when it was current what do you think to odds of finding parts today are. If you are really in love with it look at replacement motors but Buconero is right, it would be far easier to replace it.
The McGuyver answer is to put Scotch Tape around the path traveled by the belt at the platter end. That would either be around the sub-platter or the platter itself, depending on the design of your turntable, which I am not familiar with. If speed is constant, but off a bit, this is a surprisingly easy fix. Best of luck!