Chesterfield, MO
C2 has leaked.
It has corroded the parts to it's left, which are the zero cross circuit parts.
The top, very thin trace, just to the right of the fuse holder, is corroded too.
My guess is that there is additional corrosion, perhaps under U1, that is severing the communication to the satellite device buffers.
Better send it to a pro for corrosion abatement.
Removing the 74LS374s (like U1) is not trivial.
BTW, this has cropped up at least twice in the last two weeks. Interesting trend.
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Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact ... for board repairs
http://www.PinWiki.com - The Place to go for Pinball Repair Info
Hamilton, ON
