Cassette player on mx-d302t
As you know cassette decks have been around along time, and as such they are fairly robust.
The vast majority of the time, problems like you are describing are the result of a broken drive belt, or bad capstan motor. This is not true for all, but if you have favorite tapes you wish to play, you need the deck fixed, and if the problem is drive belt or motor, the repair normally should not be hugely expensive.
Hope this helps, good luck!