Korg Microarrranger joystick test mode?

I have a Korg Microarranger here the joystick was broken . i was able to fix it with some epoxy and its holding well. The pitchshift works but the other mode not sure what its supposed to do.
I am not a player but rather a repairer and would like to find out how to enter diagnostics to make sure joystick is fully functional.