Quoted from dinot:
I finished (almost...as I am waiting on a few more mods) setting up my NIB Pro that I received last week. I noticed that the "O" right orbit doesn't always advance the CHAOS (when it is flashing).
In switch test mode, it registers 4 switches. I've tried flinging the ball fast and I still count 4 switches (I just realized that I can slo-mo video the screen to see if it registers every switch...I can try that tomorrow).
During the game, it seems to never advance the O shot unless the jeep is to the right and the ball hits the up post and feeds into the pops. I can fling the ball through rapidly and doesn't advance the O. If that jeep is to the right, the O advances. It is late tonight and I haven't performed extensive testing. (Wife goes to work early and the pin will wake her...gggrrrrrr)
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I assume the 4 switches you are seeing are 52 Right Orbit Enter, 53 Right Orbit Exit, 63 Left Orbit Exit and 62 Left Orbit Enter. Switches 52 and 63 are optos, while 53 and 62 are rollovers. With the orbit post up (truck facing right) it would only need to see switches 52 and 53 activate to award the O shot, but I'm wondering if when the post is down it needs to see the ball make a full orbit?? In which case it possibly needs to see all four switches. Maybe test this in a game with the glass off, get the O flashing and see if you can get it to register with just switches 52 & 53 regardless of the truck position. If it will only register with the truck facing right (post up), try again with the truck facing left (post down) and manually passing the ball across all 4 switches - similar to what you did in test mode.
If it needs to see all 4 switches with the post down, I wonder whether a fast flipper hit ball is potentially getting some air and causing switch 63 not to register. Try putting some black tape over the lower half of the opto hole on switch 63 (just left of the spinner exit into the orbit), this will ensure that the beam will be fully broken by an air-ball (rather than only partially which the game won't recognise). Worth a try at least.
Hope this helps and let us know how you get on