JVC Multi-Play CD Player Changer

This unit was fully functional...until I accidentally got it mixed up with another CD changer

It shipped to the wrong buyer, and by the time it made it back to me it was broken

Seems like it was dropped, and now it doesn't register the disc cartridge being inserted, and makes weird noises when hitting stop

It may be just be a jammed gear, or could be something more critical, either way, I can't get it to work