| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming device by which the defect of voltage application of an electrifying charger is easily detected. SOLUTION: When several developing material images successively fed are fed at specified intervals, it is judged whether a toner stuck amount sensor measures an off-image area existing between the developing material images or not, and in the case of measuring the off-image area, it is judged as the malfunction of the electrifying charger when toner density is equal to or above a stipulated value. |
