How to calibrate Joystick Genie Z60-34 year 2002

Dear all, We have 1 issue with Genie Z60/34 year 2002. The main boom joystick has problem with boom up function. Other functions work normally. We tried to calibrate the joystick as mentioned in the manual. However, after calibrating, the joystick didn't work (all functions of the joystick didn't work).:Banghead We didn't hear any error alarm. We haven't checked the fault code yet. But we don't know how to check the fault code. To make short, as the moment we have the main boom joystick doesn't work. Other functions work normally. The ground control works normally. I hope someone can give us advice since our technicians have never worked on newer model before (most of our machines are year 2000 models). Regards, Nick,