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Quoted from zacaj:I'd definitely check the voltage then.
Check the logic voltage DC, should be 4.8VDC-5.2VDC. Check the logic voltage with a meter set to AC to check the ripple voltage. If you've never replaced C15 12000uf, chances are high you have high ripple as the game warms. Check logic supply at pin 3J6-7 on the power supply.
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Berea, OH