| 摘要 |
PROBLEM TO BE SOLVED: To display a dew condensation state without need of a humidity sensor. SOLUTION: In a control part 10, a 'dew condensation' signal is transmitted to a display part 12 when it is confirmed based on the output of a sensor 9 detecting the bias voltage of an electrostatic charge roller 3 that an impressing bias value is suddenly reduced to the impressing bias value 1200Vp-p corresponding to high temperature and high humidity from the impressing bias value 1400Vp-p corresponding to normal temperature and normal humidity in a short time, for example. On the other hand, when a BD(beam detection) error is caused because of the dew condensation or the like of a BD mirror, a BD error signal is inputted to the control part 10 from a BD detection part 11. Besides, a BD error state is also transmitted to the display part from the control part 10. |
