| 摘要 |
An object of the invention is to provide an image forming apparatus capable of judging whether an expendable member such as a toner box mounted thereto is proper or not without reading all of specific information previously stored in a storing section of the expendable member. The image forming apparatus comprises a toner box removably mounted to a main body thereof, having an IC chip including a memory for storing the information specific to the toner box, and a CPU for judging whether a toner box mounted thereto is proper for the image forming apparatus or not. When a proper toner box is mounted to the main box for the first time, a random number is generated and stored in the memory of the IC chip and a memory of the main body, to carry out subsequent judgements of whether a toner box is proper or not using the random number.
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