Mr. Pinball Tip:

On some electromechanicals, usually Williams, the credit unit can cause a blown fuse or cause the game to reset in the middle of a game. This can happen when the credit wheel over rotates past zero or past the maximum credits. This forces the zero-position switches to short against each other or against the maximum credit switch as shown in the figure below.

This problem usually doesn't happen, but sometimes does because somebody messes with the credit unit, incorrectly trying to set it for free play. The solution to this is to make sure the limit pegs/screws on the credit unit are in their proper positions, and if needed put something between the switches, such as electrical tape or fishpaper insulator.
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