The Simpsons Pinball Party
Stern, 2003You're currently viewing posts by Pinsider ChrisHibler.
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Does the MPU board have any alkaline corrosion?
Power is not the issue.
The issue is MPU to Dot controller communication.
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Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact/
http://www.PinWiki.com - The new place for pinball repair info
Oops. Typo. Corrected. MPU to Dot Controller. I’ve fixed quite a few of these. There is a 74HCT273 that interfaces the 68B09EP to the plasma controller outputs. For whatever reason, that IC seems to fail on WhiteStar boards more than any other.
You could diode test it via the PinWiki procedure. But I’ve had that fail to indicate a failed IC.
I’ve seen corrosion on the dual headers cause the same behavior and corrosion on the dot controller itself too.
Those boards are not trivial to work on. I’d engage a pro before trying it yourself.
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Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact/
http://www.PinWiki.com - The new place for pinball repair info
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Chesterfield, MO