Methods and apparatuses for sensing rotational position of a component in a printing device

A method for determining a threshold level and locating a home position of a rotatable element in a printing device, the method comprising;

• rotating the rotatable element in the printing device and an encoder disk coupled to the rotatable element;
• during the rotation, monitoring signals from a home position detector configured to detect a home position location on the encoder disk;
• during the rotation, determining maximum and minimum values of the home position detector signals by analyzing a plurality of signals received from the home position detector during the rotation and determining which of said plurality of signals is the maximum and which of said plurality of signals is the minimum;
• automatically determining a threshold level based upon the maximum and minimum values that are determined wherein the threshold level is automatically determined after a first state transition of the home position signal and during a second state transition of the home position signal, wherein the first state transition comprises a change over time of the monitored signals between two states and wherein the second state transition follows the first state transition and comprises an opposing change over time of the signals between the two states;
• and
• identifying when the home position signal reaches the threshold during the second state transition of the home position signal.