Adjustment of voltage manner and the image formation device to the main charger in work image unit and work image unit

摘要

PPROBLEM TO BE SOLVED: To provide a developing unit and an image forming apparatus in which electrification is excellently adjusted even when individually replacing the developing unit or a single photoreceptor. PSOLUTION: By arranging a unit sensitivity adaptable adjusting means for adjusting voltage to a main charger given to a feed part in accordance with discharge characteristic caused by the attaching position of the main charger provided in the developing unit, and a photoreceptor sensitivity adaptable adjusting means for adjusting the voltage to the main charger given to the feed part in accordance with the sensitivity of the photoreceptor, the developing unit is replaced without performing difficult adjustment. Furthermore, when replacing only the single photoreceptor, the developing unit where the photoreceptor is replaced is adjusted by an easy method. PCOPYRIGHT: (C)2004,JPO&NCIPI