Apparatus

An apparatus comprising:

• a member;
• a head including a plurality of emitting units disposed along a rotational axis direction of the member and configured to expose the member;
• a generation unit configured to generate image data for controlling ON and OFF states of the plurality of emitting units, and output the image data as serial data;
• a conversion unit configured to receive the image data as serial data output by the generation unit, and convert the serial data into parallel data;
• a drive unit configured to drive the plurality of emitting units based on the image data as parallel data converted by the conversion unit;
• a reset unit configured to reset the conversion unit to an initial state;
• an output unit configured to output an enable signal indicating a state where the conversion unit is able to receive the serial data;
• and
• a power source configured to supply power to the conversion unit,
• wherein, after the power source supplies power to the conversion unit, the output unit outputs the enable signal, and
• wherein, after the output unit outputs the enable signal, the reset unit resets the conversion unit.