| 摘要 |
A toner is locally concentrated on a portion of the interior of an image forming apparatus when, e.g., a door of the apparatus is opened/closed or its power source is switched on, resulting in a nonuniform toner concentration. This nonuniform toner concentration is uniformized by consuming the toner within a predetermined time period by forced printing. A variation in toner concentration can be restored at a high speed, thereby preventing formation of a defective image caused by a variation in toner concentration.
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