| 摘要 |
A load current flowing in a charger in a printer of electrophotographic system is detected through resistors, a masking process is performed to a differentiated part of a waveform of the load current, and then the obtained current is compared with a reference value. If the load current is norma, the masking process is performed to a peak portion of the differential waveform. However, if the load current is abnormal because of abnormal discharge or the like, the masking process is not performed to the peak portion of the differential waveform. Thus, in the latter case, since the load current is larger than the reference value, driving of the charger is temporarily stopped.
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