System 3 Multiple Switch Closures

bridgeda

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I have tried absolutely everything that I can think of. I have a Wipeout machine that when the trough switch (switch 34) is activated the upkicker switch (# 35) also activates. When you activate the upkicker it works as it should. #34 is the only switch that is displaying this problem.

I have tried everything I can think of. Checked the diodes on the diode board checked all the light sockets on the #3 strobe line. Replaced the transistors on both the strobe and the return, but the problem persists. Anyone have any other ideas of what this could be?

Thanks!
 
For anyone interested the problem was found. Two diodes on the #4 and #5 returns that tested good with the machine off actually would fail when the light attached to it would illuminate. It would have a good deal of resistance still but it was allowing current to flow in both directions. This caused all sorts of crazy switch matrix problems when the bulb in question would be on.
 
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