Sharp AR-5132 copier won't copy, no error message

Question

I've got a sort of odd problem, and was wondering if anyone had run into anything like this. I've got a Sharp AR-5132 copier and it won't start copying. No error message, the LCD says "Ready to copy", it'll respond to keypresses on the keypad, but it just doesn't do anything when I press Start. I've got it to try and start a few times by pressing Start when it's doing its initial power on tests, but then it gives my a paper feed error. I've been racking my brain over this but I just can't think of anything. Thanks--Richard