Lexington, KY
start by disconnecting the gi. j120 and j121. retest with coin door open
(Topic ID: 127882)
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Twilight Zone
Bally, 1993
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test again with coin door open (which disables high voltage output to playfield). Leave in attract mode. If it still stays hot after a couple hours, then it's probably bad traces in the power driver board.
Next option is to disconnect the plasma and video driver board. Those can get pretty hot and an old plasma could require a lot of current.
Normally, transformers are designed to run warm, but never hot. You're sinking too much current somewhere and surprisingly not popping fuses (assuming someone did not put 20amp ones in).
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