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(Topic ID: 276095)

Bally won't boot . 4 flashes?


By the96stang

3 months ago



Topic Stats

  • 6 posts
  • 4 Pinsiders participating
  • Latest reply 3 months ago by Billc479
  • Topic is favorited by 1 Pinsider

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    #1 3 months ago

    I have a Mr and Ms Pac man that will not boot. I've confirmed its not an MPU problem as that will boot in another game.

    When I got it the 5v fuse was blown. Isolated that issue down to the sound board which has currently been removed and the fuse no longer blows.

    Now when it goes to boot it flashes 4 times and stops about half the time. The other half of the time it flashes 8 times, all the displays and insert lights flash for a split second, and then it locks up with no playfield lights on and no action from the LED.

    Where do I start on this? Would a connector issue cause this behavior?

    #2 3 months ago
    Quoted from the96stang:

    ould a connector issue cause this behavior?

    Yes, as well as other issues. Connectors are a common problem.

    #3 3 months ago

    Sounds like you are counting the flicker as you mention eight flashes. Since no 4th flash make sure MPU j1 and one of the lamp driver connectors are not mixed up. They are same pin count and key in the same position.

    #4 3 months ago
    Quoted from barakandl:

    Sounds like you are counting the flicker as you mention eight flashes. Since no 4th flash make sure MPU j1 and one of the lamp driver connectors are not mixed up. They are same pin count and key in the same position.

    Connectors are correct.

    #5 3 months ago
    Quoted from the96stang:

    Connectors are correct.

    unplug mpu j1, the sound board, driver j4 and see if reliably boots every time. if so put MPU j1 back on and unplug all the displays, lamp driver board, leave driver j4 and sound unplugged and try again. Then slowly add connectors back one at at a time and see if one of the other boards is causing 4th flash to fail.

    check good +5v and good +21v test point on mpu

    #6 3 months ago

    As Barakandl said, check your voltages at the MPU. If you have an analog meter or an O'scope, use them while monitoring those voltages. I've seen the voltages dip below the threshold during start up, which causes the MPU to crash. Finding the cause can be a bear, but usually it turns out to be a connector issue.

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