| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus where the unauthorized use of a cartridge is prevented. <P>SOLUTION: The memory 21 of the cartridge possesses a ROM area Ra where the ID of the cartridge 20 is previously recorded and an EEPROM area Rc where the use information of the cartridge 20 including a printing feasible sheet number corresponding to a toner use quantity is recorded, and by the CPU 21 of a main body part 200, coding processing by a common key system is applied to the printing feasible sheet number by taking the ID of the cartridge 20 as a key for coding at the time of rewriting the printing feasible sheet number in the EEPROM area Rc. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
