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  1. Need guidance on what the problem might be

    Have you checked the power supply voltage? a service bulletin is posted regarding the 5v. https://www.arcade-museum.com/manuals-videogames/J/Johnny_Nero_Action_Hero_Tech_Bulletin.pdf

  2. Carnival PCB alteration

    According to the pinout that is available on the International Arcade Museum website. The -5 volt is required for the board to function.
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