| 摘要 |
PROBLEM TO BE SOLVED: To appropriately display the replacing time, on deciding new/old of a unit by providing controlling means capable of performing the generation of image forming material replacement signal indicating that the image forming unit reaches the replacement time when count by counting means becomes to a specified value. SOLUTION: When a power is supplied on the device main body 1B fitted with the drum unit 30, the color developing unit 40(A) and the black developing unit 40(B) there, potential to be input to input terminals IP 31 to IP 310, IP 3 and IP 4 of an interface 81 is severally read. When the respective potential is entirely low level, the every unit is decided as the fresh. Next, when the printing is performed, the print number is severally memorized by a counter A84A or B84B. A CPU 82 on finding that the print number of the counter A84A or B84B severally reached the specified number, performs the display on a display section 85 for requesting replacement of the color developing unit 40(A), or the replacement of the black developing unit 40(B). |
