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Thread: Green gun seems to keep firing

  1. #1
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    Green gun seems to keep firing

    Hey All,
    Anyone here know why this is happening and what the fix would be?
    My google-fu is failing me.

    Thanks!
    S64YOQoTQAi3%kc2c2yAaA.jpg

  2. #2
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    Spark gap on the green cathode has become partially conductive. If this is the case, removing the gap is easy and quick before checking other things in the green circuit. Mentioning the monitor model and posting a pic of the neckboard would help.

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    Thanks for the reply! Iíll be in a position to pull it apart on the weekend and confirm, this is in a Daytona USA.


    Sent from my iPhone using Tapatalk

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    Ok it is a nanao 05a0036261 chassis
    And a Toshiba A68KJU96X Tube

    Picture below





    TIA


    Sent from my iPhone using Tapatalk

  5. #5
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    It's a Nanao MS8-29. Desolder this component on the CRT board (lifting one leg would be enough):

    https://imgur.com/QEvFqVt

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    Thanks for the advise! Before I do it can you explain what this does exactly or share any links that may educate me?

    TIA


    Sent from my iPhone using Tapatalk

  7. #7
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    Your red/blue plug horizontal yoke is in the wrong section..Need to line up it next to the vertical plug.

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    Looks like I have a few more caps and resistors




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  9. #9
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    Those are not relevant. Desolder the brown spark gap closest to the blue cap. It's for protection. In case of a flashover inside the tube it attracts the spark that would otherwise damage the cathode and discharges it to ground. If it's defective it could leak to ground and that would explain the excess of green (a complete short across the cathode and ground would give a full green screen). So this is easy to check as a first step. If the green streak is still there you'll have to troubleshoot other components in the green circuit (diodes and transistors) and that's more complicated.

    Similar problem on a MS9:
    https://forum.arcadeotaku.com/viewto...31401&p=439663

  10. #10
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    Quote Originally Posted by dragonlee View Post
    Your red/blue plug horizontal yoke is in the wrong section..Need to line up it next to the vertical plug.
    Genuine questions: given there are visibly two whole yoke connectors on the board, why the double? Are they just vertical mirrors, for a complete 4-in-line plug that hasn't been snapped in half? If so, why does matter which way around the plugs are, as long as the image looks right (and of course, you never mix vertical and horizontal)?

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