(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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    #1 2 years ago

    I have a MPU-100 that will randomly jump into test mode while playing, have narrowed it down that it is a MPU problem, swapped in a good mpu and it plays fine, swapped PIA's, no change, just wondering if anyone else has seen this happen, its like the matrix is getting a signal from somewhere. figured I would ask here first , never seen this issue before

    #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.

    #3 2 years ago

    Hot Hand?

    #4 2 years ago

    I just replaced the mpu with a bally -35 and its now folded ready to go to the new owner, I'll bet it is a cap, hard to check on the bench, I have a eightball I can try it in once I pull it out
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