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The only display I am having problems with is the credit/match display. The missing segments are “B” and “C”. So I changed out the Z2 (UDN6118) chip with a new one. But no change, I am still missing the same two segments. After looking at the schematic, I am starting to think it could be...

I am trying to get my brother-in-law’s pinball machine working. The pinball machine is a Gottlieb 1980 Spider-Man. The problem is the machine will never kick the ball back into play. The machine just keeps resetting. While the ball is in play the machine seems to be working perfect. I have...