Since you didn't even identify what "recorder" you are talking about we don't have a clue if it's a mechanical or electronic button transport you damaged. Kinda hard to suggest a fix other than - don't drop it in the past.
rickajho
January 2016
Well you take it apart and examine it to see why it's misbehaving - nobody here can see what's happening . Nobody here knows the make & model.
It is not wise to drop sensitive electronic devices - even less wise to do it repeatedly.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix cassette recorders.