Find and repair/correct any mechanical issues with the Ball Count Unit.
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Find the Ball Count Unit. It should be marked. It is a stepper unit that only increments 5 steps. Usually only three fingers on the wiper blade stack.
One solenoid resets it to Ball 1, the other solenoid increments the wipers and gear by 1 ball each step. Start game and if the unit only resets to "Ball 2"; study the unit and eliminate the bind preventing it from zeroing. It is probably gummed up. Clean the rivets with alcohol (game unplugged, wait for alcohol to boil/dry completely before turning machine on). Conversely, you can sand the contact rivets with fine sandpaper to remove the gumming stuff.
If this fails, add tension to the clock spring.
Verify that the ball count unit operates quickly to reset. Then trace the circuit and determine why the ball count step up coil energizes when it isn't supposed to.
It sounds like the Ball Count Unit has a mechanical bind. Verify proper operation by manually operating the step up solenoid and then the reset solenoid plungers.
If there isn't smooth operation, remove the wiper finger assembly and clean the rivets, replace, and don't tighten down the locking screw & washer as tight as it was.
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