Kodak Carousel 760H wont advance or reverse. I think I pushed the reverse button while the

Question

I think I pushed the reverse button while the projector was advanceing and now the projector will not advance or reverse the slide tray. I can hear it try to move the tray but nothing happens.

Bought a used 800carousel projector and it won't forward or reverse. Since I am doing a large project, I'd like to be able to do more than process one slide at a time. It's not my carousel nor my stack viewer. Hope you can help.