Version 2.0.0 of the MAC 550 CPU software fixes a bug that allowed the head to tilt more to one side than the other. As a result of the fix, the tilt home position will not be completely vertical after updating to version 2.0.0 software.

We recommend that you calibrate the tilt to the fully vertical position with the tilt offset command (UTIL > CAL > T_OF) after updating to version 2.0.0 software.