Point Pleasant, NJ
Probably time to post some pics of the switch in question. The problem at least appears to be playfield-related so far...
(Topic ID: 270879)
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Williams, 1980
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Quoted from robm:So is it normal to have the 38VDC at those switches?
No, and that's where you're problem must lie. Unfortunately those circuits are designed only to handle 5vdc, 38vdc is definitely frying stuff. You'll have to figure out where the wiring got mixed up or shorted on the pop bumper coil and/or switch(es) that's causing the issue. 38vdc should *only* be at the coil. 5vdc at both of the switches.
Damn, good catch. In case you're interested, connector keys can be added to the connector to prevent this type of thing from happening again. You'll just need a key/plug for 0.156" pins like they have here at GPE: https://www.greatplainselectronics.com/proddetail.asp?prod=15-04-0297-STRIP
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