I just pulled up a photo as I was wondering what the unit is. Looks like a reel to reel that also plays cassettes and 8 tracks! Wow!
They probably used the same motor in many different units, so you'll have to do some research if the motor is found to be bad.
But, in a complicated electromechanical machine like this, there's a greater chance the motor is good and the fault is a belt, rubber drive tire, micro switch, capacitor, etc.
Even old dried up grease on mechanical linkages or a broken or worn plastic part will cause issues.