| 摘要 |
An image forming apparatus has a photoconductive drum which carries an electrostatic latent image, a developer supply unit which supplies a developer to the photoconductive drum, an image carrier which carries a developer image, and a density sensor which measures a density of a test print on the image carrier. The image forming apparatus carries out a second image quality maintenance operation for lowering a contrast potential when the density of the test print is higher than a predetermined value. When the test print is still dense even if the contrast potential reaches a lower limit value, the image forming apparatus carries out a first image quality maintenance operation for discharging the developer, then supplying a fresh developer to the developer supply unit, and causing the developer to be stirred and thus charged.
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