I have a Williams Time Warp with stuck switches. When I run a switch test (http://www.pinwiki.com/wiki/index.php?title=Williams_System_3_-_7#Switch_Problems) without the switch wiring (2P2 and 2P3) plugged into the driver board, the switch test indicates that switch 37,5,13,21 and 29 are closed. The entire matrix line on the green/white row is not working. I know there is a problem with the board. I have checked voltage on the green/white and it appears to be correct.

This machine has not worked in 30 years. I had the board repaired from battery damage and also replaced some bad capacitors on some switches (one of those being switch 21 (left bottom jet bumper)) that were pulling in solenoids and burning out the soloed fuse. The machine wiring now appears to be good. Machine now plays, just some of the switches don't work.

Guy who repaired the driver board has offered to repair again (dude has been very helpful), but I have to mail the board back. There is a chance I could damage the board again if the issue is intermittent. Would hate to mail this thing back more than twice.

He thinks 4049 hex buffer on the driver board may be bad. Can anyone tell me how to test? Or point me to a resource? ... or have any other ideas on why the switches are not working and how I can track down the issue. I am an fairly new at this, but really enjoy. I may be coming addicted.

I have a logic probe, but have never used. Any good links or advice on how to use? I the meanwhile I'll google.

I need some help interpreting the results of the logic probe. In game mode I get a high signal out of the 4049 for the offending circuit and nothing in. If I hit a switch on the circuit, I get a very dimly lit low signal on the logic tester. If I check a non-offending circuit across 4049, I get high out and low in. Both are strong. Nothing changes if I push in a switch on the good circuit. Does that mean 4049 is bad?

Have not checked the PIA. Not sure where it is at yet.

Need some guidance on the logic pin results. See above, Please help.