Shadow, The
Bally, 1994You're currently viewing posts by Pinsider supermoot.
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I would just pull the diodes and test them and plop in some new lm339s at u2 and u3. I've accidentally used lm339's as fuses in a situation similar to yours on doctor who.
Find a pinball nerd nearby who is good at soldering, this is like two bucks in parts.
ps you did a really good job at diagnosing this! The reason its those three is they go through the chips at u2 and u3. the working switches go through u1. they are numbered a little funny on the schematic.
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