Tracking down intermittent problems may be made easier with this trick. For a
machine that went into a slam mode, I wondered if there could be a specific
combination of events that caused the problem. I couldn't follow the ball as
it moved too fast so I caught the problem on video by taping play with a
camcorder mounted on a tripod and playing the tape in slow motion. I was
able to determine that when the right flipper was energized, a target switch
was closed and another target was hit, closing another switch the switch
matrix would erroneously read a slam because of a bad diode on one switch. I
was able to reproduce the "intermittent" problem and correct it.
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