Quoted from Frax:Check out Pinwiki for the WPC section...pretty sure they cover this. If I remember right it was something dumb and/or easy.
http://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Check_fuses_F114_and_F115_messagey..
PinWiki has come a long way since I last looked ...!! Good work someone!
I have found this issue is usually a blown chip at U20. Caused by voltage going into the switch network.
My Champion Pub had this issue. Coil voltage had entered the switch matrix through the speed bag mechanism (not unusual evidently) It took out 3 chips ... U20, the one above it and also the security chip.
If you have another machine, try swapping the U20 chip and see what happens.
And of course, if this fixes it you need to find out where your short is and stop it. Or else it will happen again.
Good luck!
Las Vegas, NV
Vancouver, BC
