I think you're over thinking this, I highly doubt there's any analog trickery going on with the LED boards, that just seems like it would just way over complicate things and open it up to falling out of calibration way too easily. The Circuit design on the LED board should be easy to determine, as it's a single layer/single sided PCB with mostly obvious traces. I originally assumed that this was just for the analog output voltage since it works within a 0-5V range, it seems odd to me that it would use this on the LED matrix, even more strange that it would use it in addition to 12V. The Gun I/O has a 12V input for power, and then it uses a Voltage converter to create 5V. or pedals and steering, again because the game doesn't know the difference. technically you could even play an analog based game like Super Monkey ball or even a racing game and just tilt the gun around instead of using an analog stick. Sega was pretty brilliant in the design because it means that you could swap out the IR guns for a set of mounted guns with POTs for X and Y and the game wouldn't know the difference. The Games that use this each have their own internal calibration, which really just adjusting how the game interprets to whatever output voltage the Gun I/O is providing. That's what makes this system so beautiful for use with a PC. The thing is this whole gun assembly is self-contained, it doesn't need to be attached to anything at all to function, the output pins will happily provide whatever X and Y voltage coordinates that match where the gun is pointing. and again I've been told to never EVER EVER touch these, they're set from the factory and shouldn't ever need to be changed. The sensor in the gun itself has 3 adjustment screws, again these look like adjustable caps, not pots. each one of these sits next to a tiny 50Hz inductor. The position of these on the board leads me to believe that there are 2 of these per gun, probably an X and Y adjustment. everything I've read has said to never EVER EVER touch these, they're set from the factory and shouldn't ever need to be changed.
There are 4 adjustment screws on the Gun I/O board I believe they're adjustable caps, not pots.
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