| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrophotographic printing device capable of normally operating a transfer device even when air pressure in the installation place of the printing device is fluctuated. SOLUTION: This device is equipped with an air pressure sensor for measuring the air pressure around an image carrier, an abnormal state detection means applying specified voltage to a transfer means and detecting the occurrence of abnormality in the transfer means when the voltage is equal to or above previously set reference voltage or equal to or under the reference voltage, and a reference voltage changing means changing the value of the reference voltage based on output from the air pressure sensor. |
