I have 3 machines that are currently experiencing this issue. I have two AP 112's, and an FSI/USI 3076 with this problem. I just barely purchased a new bill validator for the FSI/USI 3076 and also recently upgraded the control board with an inone kit. The AP 112's have original parts.
Basically, the machines accept one bill just fine, but then will not accept any subsequent bills for the same purchase. Basically, anything that is priced over a dollar, the difference must be made up in coins. Why is this happening and how do I fix it?