An apparatus includes a member, a head including a plurality of emitting units disposed and configured to expose the member, a generation unit configured to generate image data, and output the image data as serial data, a conversion unit configured to receive the serial data, and convert the serial data into parallel data, a drive unit configured to drive the plurality of emitting units based on the parallel data, a reset unit configured to reset the conversion unit to an initial state, an output unit configured to output an enable signal, 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.