Hopper reset circuit for Jon
The hopper reset generally only has 2 switches to operate the payout counter reset coil/solenoid (hopper reset)
They are the 'B' switch on the left of reel mech just above the clock and fan (horizontal switches), and the Hopper Zero switch, located on the hopper carriage.
It's a go, no go type circuit. First, the hopper only needs to be reset after a pay. This is done by the Zero switch, which only closes after coin paid out. Obviously, why pulse the reset solenoid when there has NOT been a pay? That would only wear out the solenoid and hopper parts unnecessarily. Now the machine will not reset if the zero switch remains open, because it will payout once but not reset, e.g. if you hit a cherry it will pay 2. If zero stays open, and you hit 2 cherry, it will only pay 3. Then if you hit oranges it will only pay 5. And then on plums only will pay 4. You see, as the wiper fingers keep moving up the board and not resetting, you will get short paid.
The machine will work fine however if the zero switch is stuck closed. Again, the only bad thing that will happen is that the hopper will reset on each and every new game, or, more technically every time the handle is pulled.
And that leads us to the 'B' switch, which is the one responsible for resetting the hopper when you play a new game. As the handle is pulled the reel mech variator (above fan) will pull back and mechanically close the B switch. As soon as that heppens, the pulse goes to the zero switch, and if it is closed, it resets hopper solenoid, and payboard goes back to zero. Only if these 2 switches close will the hopper reset.
Now, if the B switch remains closed, then you will have a runaway hopper, because, as soon as your pay starts, the zero sw. closes and immediately the hopper resets because the B switch is stuck closed. Then as the payboard resets, the machine says, well go ahead and pay, hopper, so hopper starts to pay again. But, woe, the zero closes and hopper resets again...over and over and over. So I used to tell my folks to BE careful with the B switch. Some folks got to be so good at this adjustment, that they could actually get the B switch soooooo close, that they could whack on the left side of the cabinet and get the B to close just momentarily. I have done it. The idea here is to wait until you hit a high pay (200 coins or so), and then after the payout, whack the machine, and reset the hopper and get it to pay again. And again. and again...and.......until the hopper runs dry and gets refilled by attendant. The bad guys used to drill the machine and stick in a wire to close the B switches, and we would hear the drills once in awhile on the casino floor.
Now there are other circuits that will also reset the hopper, most notably in the Continental type machines where 2nd coin pays require the hopper to reset, and 3rd, 4th, 5th and 6th coin resets also will allow for proper multi coin payouts. But that is different specialty circuitry only for those type of machines.
Hope that helps.
PS, BTW, now you should realize that the quickest and easiest way to reset your hopper when testing payouts, is to simply push back on the variator bar and that will reset payboard and restart the pay. Make sure you have your hand down there ready to catch coins coming out. No reason to recoin the machine and hold the reels to check the same pay, right?