After having made a first calibration print, I tried to make a new one with adjuted parameters but the servo is no more working. It was no more able to turn to select the Hotend #1. So, I turned off the printer and made again the calibration procedure for the servo. I discovered that it can turn to select the Hotend #2 but it can no more turn in the other way.
Is the servo already broken?
How can I solve this problem?