I believe an 85s is some sort of yamaha.
My view, which some peope don't like, is that this general type of turntable wasn't very good when it was new and i can't see it being any better now that its old.
Still it will play and one mans laidback and warm is another mans dull and boring.
I would however change the cartridge first it is ancient. I reckon the audio technica at95e is and always has been a cracker.
I'm assuming the belt is ok the pulley and subplatter are clean and the main bearing has oil in it. You could probably carefully oil the dc motor. If you then think its ok replace any parts in the pwr supply.