Harlem Globetrotters On Tour
Bally, 1979You're currently viewing posts by Pinsider EEE.
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You may have a bad switch diode on the slam dunk that is causing the problem, so if you can replace that switch or its diode and put on a new capacitor, that might solve it. Make sure that it is wired up correctly too.
After that, it does sound like an mpu board issue. Perhaps a connection is really fatigued. I would pull & reseat the connectors, then I would check continuity from the switches to the board.
I cant wait to play it 
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Tucson, AZ