Awesome thread.. Thanks to all who contributed ideas and tech info.. I had no idea there were so many fundamental flaws in my Black Knight.. As someone who had a house fire because of an electrical problem about 18 months ago, I know now I'm not going to leave the room with my BK plugged in at least until I get my fuse kit I just ordered! (No, the fire wasn't pinball related!)

-Steve

http://home.kpn.nl/p.koch3/bridge_board.htm

Available on Big Daddy Enterprises in the USA..

Working on a Williams Gorgar.. Done all the basic bulletproofing stuff as documented in this awesome thread, and was testing my CPU/Driver board on the bench, and notice with my light test fixture, that the lights which are OFF are really very slightly still on.. I have done the "upgrade" of replacing the TIP42s with IRF9Z34N, and have replaced the old power resistors with wires.. Should I worry about what appears to be slight current leak though some part of this circuit, or is this not going to be noticeable when running in the machine? I have used the test rom to verify the actual control of each light works properly. If each row/column looked all the same, I probably wouldn't worry about it, but as you can see in the picture, it's different for each row or column. Am I being too picky? If not, what should I try to replace? Thanks!! (This picture is while the test ROM is running, and was randomly snapped while one LED which was flashing, happened to be off)

IMG_6315 (resized).JPG