| 摘要 |
A developing unit mountable to an image forming apparatus having mounting slots is disclosed. The image forming apparatus includes a first mounting slot for mounting a yellow toner developing unit, a second mounting slot for mounting a magenta toner developing unit, a third mounting slot for mounting a black toner developing unit and a fourth mounting slot for mounting a cyan toner developing unit. The image forming apparatus is capable of determining whether a developing unit with a specific color toner is mounted to a proper one of the mounting slots.
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