(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


Linked Games

No games have been linked to this topic.

    #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
    Of my stash

    Promoted items from the Pinside Marketplace
    $ 84.95
    Playfield - Toys/Add-ons
    PinBoss Mods
    $ 49.99
    Playfield - Toys/Add-ons
    Lighted Pinball Mods
    From: $ 5,599.00
    Pinball Machine
    Music City Pinball
    $ 750.00
    Flipper Parts
    $ 45.00
    Playfield - Toys/Add-ons
    Sparky Pinball
    $ 96.95
    Cabinet - Shooter Rods
    Super Skill Shot Shop
    $ 29.99
    Cabinet - Sound/Speakers
    Lighted Pinball Mods
    £ 29.00
    Lighting - Led
    $ 369.00
    Cabinet - Decals
    $ 125.00
    Cabinet - Toppers
    Sparky Pinball
    $ 79.95
    Cabinet - Shooter Rods
    Super Skill Shot Shop
    $ 495.00
    Cabinet - Armor And Blades
    MI Pinball Refinery
    $ 140.00
    Playfield - Toys/Add-ons
    $ 15.00
    From: $ 6.00
    Playfield - Toys/Add-ons
    ModFather Pinball Mods
    $ 79.00
    € 8.10
    Flipper Parts
    From: $ 175.00
    Gameroom - Decorations
    Pinball Photos
    From: $ 42.00
    Cabinet - Shooter Rods
    ModFather Pinball Mods
    $ 38.99
    Lighting - Interactive
    Lee's Parts
    $ 84.95
    Cabinet - Shooter Rods
    Super Skill Shot Shop
    From: $ 5,799.00
    Pinball Machine
    Great American Pinball
    $ 7,499.00
    Pinball Machine
    Gulf Coast Pinball, LLC

    Hey there! Got a moment?

    Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside