Quoted from HowardR:If the Game Over (X) relay on the control bank doesn't activate when the 5th ball drains (and I'm reading my crappy copy of the schematic correctly), inspect and diagnose this circuit with alligator clip jumper wires.
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usually the wiper on the ball count unit, you'll see a lead under a lug of the solenoid, this can get broken off. if its there, clean the rivets
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