(Topic ID: 231874)

No power on the 4MBC coin door. What do I check 1st


By embryonjohn

9 months ago



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  • 6 posts
  • 5 Pinsiders participating
  • Latest reply 9 months ago by embryonjohn
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    #1 9 months ago

    When I turn on my 4 Million B.C. there’s some humming but that’s about it.
    •pressing the left flipper doesn’t activate on the light (lock switch) but if done manually inside the game, it works.
    •pressing the start button doesn’t start a game but you can play it by activating the interlock
    •If you press the coin door, coin switch, nothing happens but you can credit it up manually inside.

    What do I check 1st?

    Thank you!IMG_2780 (resized).JPG

    #2 9 months ago

    Bally fuse holders are always suspect. That's where I'd start.

    #3 9 months ago

    I'd suspect the back box Jones plugs.

    #4 9 months ago

    Coin door and cabinet Jones plugs not fully seated on the bottom (insert) board? Or, diagnose & troubleshoot the lock/Anti-Cheat Relay to the left flipper button second switch circuit first. Bypass using alligator clip jumper wires if necessary.

    Then troubleshoot the Replay button circuit. Then the Coin Switch(es). The front door slam switch, if a "Normally closed" switch must be bypassed on the Insert board before doing anything else.

    If you don't have the wiring diagram, buy it if necessary.

    #5 9 months ago

    I would try reseating the coin door jones plug.This is next to Tilt Bob. The bally jones plug female connectors are prone to issues. Good luck.

    #6 9 months ago

    The front door slam switch, if a "Normally closed" switch must be bypassed on the Insert board before doing anything else.

    Bingo!
    The damn slam switch solder hub was broken off. I bypassed by connecting the two wires and the game is 100%

    Thanks to all!

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