White Water
Williams, 1993You're currently viewing posts by Pinsider dbeeson.
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I have a strange switch matrix issue with the MPU that came out if my WH20. I have a loaner in there for the time being, but I'd really like to get this one working so I can give the other one back.
Basically, all playfield switches don't work. Test report comes up with "GND row short" for a bunch of different row #s.
Following the guides I've replaced U20 (ULN2803) and U14 (74LS374). Where do I go from here?
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Guelph, ON
Asheville, NC