Patent ID: 8548340

Claim:
An image-forming device comprising: N photoconductors, the N being equal to or greater than 2; N chargers opposed to the N photoconductors, respectively, each of the N chargers charging the opposed photoconductor with a discharge; a voltage applying unit configured to apply voltages to the N chargers, individually; an abnormal discharge detecting unit configured to detect an occurrence of an abnormal discharge at at least one of the N chargers; and a processor configured to: detect first voltages applied to the N chargers before the occurrence of the abnormal discharge is detected, and second voltages applied to the N chargers after the occurrence of the abnormal discharge is detected; calculate a difference between the first voltage and the second voltage for each of the N chargers; and identify one charger as a charger at which the abnormal discharge is occurring, the difference between the first voltage and the second voltage applied to the one charger being the greatest among the differences.