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Wednesday 21 March 2018 at 07:26
1) Is the ball tilt switch wired up correctly? If it's wired up incorrectly, the game can go a bit haywire.
2) Have you done a switch test to check for stuck switches or switches that get incorrectly triggered?
3) Have you tested the strips of diodes under the playfield and inside the cabinet? (note...
Source: http://pinside.com/pinball/forum/topic/close-encounters-number-of-the-beast-score-runs-away#post-4292041