Trying to finish up my KISS game but having an issue. I can start a game and it will kick the ball into play and everything seems to be playing correctly except that when the ball drains the trough switch doesn't realize it. I've cleaned the switch and checked for continuity, it seems to be working fine. I noticed that the diode is snipped off so I replaced it. With a new diode the game will not start at all and pressing the trough switch turns on various playfield lights.
I traced both the wires off the switch and tried to check their diodes along each switch they are connected. I also checked continuity from both wires to the mpu. By the way, I'm running a new alltek mpu board.
I can't find a switch matrix that tells me what switches are related. Any suggestions? Thanks.