in my life time i fixed over 45000 cassette players... it is either one of 2 things... 1 there s tape stuck on the flywheel, just remove it and clean the fly wheel with alcohol. if it clean and no take stuck on it, then it is the mother itself, there is adjustment on it , but likely the servo system is damages so it will need to be replaced, once you install a new one you will need a speed adjustment tape. like 333 HZ or 1 kHZ and a frequency counter to calibrate the new motor
Tony
Btw, I’m available to help over the phone in case u need at
https://www.6ya.com/expert/tony_a41fa0b801734e2f
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