A method and apparatus for prioritizing source Media Access Control address miss processing is described. Furthermore it includes a device signal for adding the adding output signals from the amplifying devices in phase, a device for detecting the average phase error of the amplified signals and for providing a compensating control signal. The second conductive layer is partially removed by a wet etching process to form a second conductive layer pattern over the second channel. This allows formation of fine halftone dots consisting of the halftone cells in the first and second groups, and it is possible to reduce banding appearing in a main scan direction during recording of the halftone dots, with low-frequency components in spatial frequency of the halftone dots caused by the halftone cells in the first group.