PEM Curve vs. Worm Gear Position


I just started doing some astrophotography with my new 1100 and I have been reading up on PEM. Since I'm new to PEM and I cannot seem to find an answer to my simple question, I figured I would just ask it here. I'm curious if there is anything about the PEM curve application that is affected when the worm gears are disengaged from the RA/DEC drive gears for checking balance etc.? Does the mount's servo system have sensors to know the exact position of the worm gears such that there are no phasing issues?

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