| 摘要 |
PURPOSE:To obtain an inexpensive device and to eliminate the need of adjustment for detecting toner by writing an addition value in a non-volatile storage means as the new result of counting and clearing the contents of counting in the non-volatile storage means at the time of changing the recording material. CONSTITUTION:This device is equipped with a video black signal counter 309 and the non-volatile memory 311, and an area for storing a toner counter value is provided in the memory 311. When a user exchanges a cartridge for a new one, the counter value is usually cleared by the user. Then, the counter 309 counts the black dots of one page. After the number of black picture elements counted by the counter 309 is converted into toner consumption, it is added to be updated in a toner counter already stored in the memory 311. |
