I finished the upgrade of my WPC driver board today. It was fairly simple despite Williams using a crappy circuit design; instead of using vias to carry power from one side of the board to the other, they rely on component leads to do that, presumably to save cost.

If you do this yourself, after you remove the component make sure to tin the ring on the component side with solder and overdo the amount of solder you use if you can’t see the component side; I had to redo several of the big capacitors because they had great solder joints on the bottom but not enough solder to grab onto the other side. So, on those components, jam more solder in there than you would normally do, and I also recommend grabbing the schematics, an ohmmeter, and checking for continuity through the hole.

WCS Power Driver Board Voltages

I measured the board voltage for future reference, both with only the input power connected to the board and the game in attract mode, using a quality Fluke voltmeter.

AC is measured to look for poor filtering by the large capacitors on the board; as the capacitors degrade there will be more AC present on the voltages.