| 摘要 |
PROBLEM TO BE SOLVED: To improve usability by providing replaceable consumables with a non-volatile memory, storing the attribute information of the consumables and changing the information. SOLUTION: By a CPU 14 incorporated in the signal processing part 4 of a printer engine, a control signal is exchanged between a printer controller by executing serial communication 15. Besides, the communication is executed among the memories 203-206 for the respective developing units of M, C, Y and Bk, the memory for a photoreceptor drum 207 and the backup memory 230 by the CPU 14. In the memories 203-206, color information, a reutilizing frequency, the name of a maker, an ID number, the threshold value of a service life and the counter value of the service life are stored. In the memory 207, the name of the maker, the ID number, the threshold value of the service life and the counter value of the service life are stored. The counter value of the service life is the information counted up based on the number of printed sheets used by the developing unit and up-dated every print. Then, when the counter value of the service life becomes over the threshold value of the service life, the service life is informed. |
