(Topic ID: 169404)

Stern MPU 100 jumps to test mode while playing


By 80spit

2 years ago



Topic Stats

  • 4 posts
  • 3 Pinsiders participating
  • Latest reply 2 years ago by 80spit
  • Topic is favorited by 1 Pinsider

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    #2 2 years ago

    Pretty sure I had something like this happen when one of the small caps on the switch matrix lines was bad. I'm not sure if I ever logged that repair anywhere. May have been C32 (390pf) which is the cap on the SELF TEST SWITCH line. I think it was happening when I'd hit a switch, but it may have been random.

    Does it still happen after you start a game if you unplug J3 (cabinet switches & self test)?

    To rule that cap out you could try desoldering one lead on the cap to break the connection and see if it still does the same thing.

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