Posted Sat Jul 23, 2011 8:38 AM
5200 is a tricky beast when it comes to calibrating controllers. The first thing is to get a controller that you know the potentiometers are properly calibrated and use it as the baseline to adjust the console pot. You are going to have to open the console case to adjust the controller pot on the motherboard.
Also, make sure you have Missile Command, Super Breakout, Gyruss, and Popeye games handy. IMO those are the big four games for properly calibrating the controller and console pots.
If you have controllers needing refurbished/calibrated and are unsure of how to do it, send them to me and I will make them like new. You will still need to check the console calibration when you get them back, but at least you will have good controllers to work with. The console pot calibration will be easy at that point. It is next to impossible to get this sorted out with both controllers and the console out of calibration.