I’m new to WPC games and I need some help. My trough optos were acting glitchy (kicking out an extra ball sometimes) so I ordered a new set and installed them. Powered her up and got the error in the picture. Checked the connections they appear fine but I reseated them on the trough optos and the opto PCB anyway. Checked the fuses and found a blown 4A fuse in F11B replaced it, turned it back on and it did not blow but I get the same error. Put the old boards back in and get the same error. Put another set of new boards in, same error. Something is wrong somewhere else but I can’t track it down.

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So I finally had some time to do some testing on it. I have 12v (14.02) all the way to the trough optos. So I pulled the trough assembly out and took the boards off. Then I held them pretty close together and it would start a game. Next I put it in switch test and here is where this gets odd, they only seem to work when they are about an inch or less apart. If I move them any further apart then that they don’t work, which is a problem because they mount on the ball trough at a further distance. Additionally if I shine a flash light at the receiver board it reacts from a distance of about 5 inches, which leads me to believe that the problem is with the transmitter board. Further complication is that I have 3 sets of boards (2 new and 1 original) and any combination of them seems to behave the same way.