Fixing up a Gottlieb Flipper Fair and everything works except this odd behavior on ball count. In reset and game over mode, start game and it will count 5 balls. If I manually advance the bumpers and hit the center target I can add balls up to 8 and no more. I can drain from the max of 8 and get back to game over state (game over light on and flippers dead).

The stepper seems to not make the last 2 positions. If I mess with the set screw and the screw adjustments on the wiper I can affect change but usually it makes it not get to ball 1 or zero and game over. There is a stop pin on the stepper gear.

First pic is reset, second is fully stepped, next is internal reset, final is internal fully stepped

Any ideas or help welcomed. Remove the stop and adjust the gears so I get to 10? That + adjustments on set screw and wiper screws?

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MarkG the best I got adjusting the wiper was 9 balls max. But I did not check if game over works right.

I messed with it a bunch. When I get it to 9 then it ends on ball one and the flippers go dead. So put it back to 8 ball max and to me it seems like a # of teeth and stop issue. I have a max of 8 positions so I dont ever see how to get to 10 unless I have 10 teeth. It does not matter what I do to the wiper, if I dont have 10 steps I will never get there.

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I cannot move the switch stop and the resistance from that keeps me from getting 2 extra teeth. Cannot move the switch stack unless I add spacers.

Could the switch stack be in there incorrectly? Like not in the right order or orientation? It works as is goes to game over correctly, counts up 5 balls to start, and goes to max of 8. No teeth are broken

Only good news is I cleaned the pivot screw for those arms on the teeth and did not snap the screw

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MarkG How about that, with the stack out of the way it resets an extra 2 spots. Now counts up to 10, then resets back. Game over switch stop moves to like the middle of the switch stack.

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I have not messed with the wipers, they are attached, but likely need adjustment once the reset position is sorted

Excellent! Thank you MarkG for the help! I was struggling as I knew what it needed to do just it physically couldn’t get it to do it. Will see if I can get some pics but will start with adding some spacers. Like I said it operates the way the switches are configured I just need it to go further to stop.

Thank you underdog I would love to see if the stack can be fixed without a spacer. For now, 2 spacers off a switch, longer screws, and she finally goes to 10! Thanks again for everyone's help!

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Thank you @undrdog! I did not think you could but perhaps the mounting on my mech is bent and on yours that makes up the ~1/2 inch needed for the 2 teeth. The switch stack orientation is all the same.

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