I'm having a tourney/get together at my place this coming weekend and I've had a long intermittent issue with the vuk that is fed from the mystery scoop. The vuk sometimes will just start going nuts and kicking for no reason and not stop throughout the game and attract mode. Then suddenly it might not do it for weeks or months. I replaced both sides of the emitter on that vuk, repinned the headers on the 10sw opto and replaced all the idc with molex and it still happens intermittently.
I decided to get a Great Plains Electronics 10sw opto replacement from BAA. I thought maybe its my 10sw opto and its got extra test functions so that could help me figure out wtf is going on with my vuk. Plugged it in, all led indicators come on, start a game, seems to be working great until I start getting drained out for no reason after mist mb. So I go into switch test and #82 the long beam opto is getting rapidly switched on and off. If I block the beam the switch stayed closed by my hand but, you can still see #82 flickering away on the DMD.
I throw my old 10sw opto back in the game and #82 is fine. Solid as a rock in switch test no flickering weirdness. If you look in the manual the only thing that these two boards seem to share is power and ground from the driver board.