Hopper high pays and the CO (Carry Over) circuit.

[OldReno]

Because of the slop in the outboard wiper assembly (driven by the spiral cam), it is impossible to accurately get a high pay (50, 100, 200 coins) to stop at exactly that amount.  Try it, it might do it once if you're lucky but not twice.
Therefor Bally designed in the carryover circuit. 
Anytime the machine is paying the CO is hot.  The reason it isn't used all the time, is that the lower pay inner wiper fingers never reach to the CO area during low pays.
If you pull off the spiral cam, you will see several CO circuits on the board.
You want to adjust your high pay outboard wiper fingers, so that they go off the tab after the inner spiral wiper fingers have gotten well onto the CO circuit.
In the case of a 100 coin pay, adjust your outboards to go off the 100 tab when the inner spiral fingers are at about 75 steps. Do a similar adjust on the 50 pay and the 200 pay  with their CO circuits respectively.
If you look at your board, you will see the CO tab stops at exactly 100 coins.  Same with the 50, etc.
Just step your board once, to lock it in, and then rotate the inner wipers up 75 steps. Then you can adjust.
You can actually meter this with your ohm-meter if you want to get fussy, but there's really no reason to get that precise.
If you are moving off short, then just pull slightly on the horseshoe shaped carriage (holding the outboards), and you will often notice that the pay will continue, showing that it's maladjusted (like me).
Hope that is some help.
The CO provides for a very accurate and precise count, and if the outboards step off before the inboards reach it, you'll never finish that high pay.