Been restoring my twilight zone pinball ( http://pinside.com/pinball/forum/topic/tz-full-restoration-in-20-days ) and when I fired her up I have ground shorts on ros 1, 2, 3, 4, 7, and 8, at least 5 and 6 are working I guess. Whats the best way to trace the problem down, also replaces the rom to 9.4h I case that makes any difference.
Go over all of your work. You have something ( ground ) shorted to a heck of a lot of switch rows.
Since it is so many, I don't know where to even start.
I think I'd look for big things first like metal parts or bits behind or on boards. Then go over all the wiring wondering WTF did I do.
LTG : )
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Medina, OH