Hopper short and long change
I too have had this problem and found this issue. If its a 1005
changer you may find that the hopper is gradually changing position on its base and the
coins are coming out properly but not making it to the
coin tray on the outside. Frequently they will land on the diverter rail at an odd angle and either fall inside the
changer box, (see if you have loose
coins on the bottom of the box, by pulling out the hopper, make sure to look under the hopper mounting plate), and the
coins could actually remain on the diverter plate and therefore fall out with the next vend. This would account for the overpay on occasions.
I fixed the issue by mounting an angle iron, (90%), on the wall of the
changer box on the inside with one of the arms of the angle iron pushed up tight against the hopper thereby keeping it in tight against the electrical connection and square with the front face plate of the base.
Just a thought.
Good luck.