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How to discharge a picture tube (youtube link)


After installing a switching power supply my coin door and/or control panel buttons don't work. What happened?


Fixing your blooming problem on your XY monitor


Installing a CR2032 battery kit onto a Williams CPU board


I'm getting a 1-3-1 RAM error message but replacing the RAM chip didn't fix the problem (rug test looks OK).


Williams Soundboard issues


Is your Williams ROM board giving you problems?


Williams Decoder Chips replacement


How to replace your ribbon cables on your ROM and wedge board


I'm Getting a bunch of ?????? on my Defender setup menu screen


Williams Joust 2 Information


Asteroids and Asteroids Deluxe ROM chip locations.


Need to replace your 18,000uf cap on the Williams PS?


4 LEDs on the Defender ROM board are on but no game play


I'll be adding items to this page as time goes on.