| 摘要 |
An image forming apparatus includes an image forming unit including a developing device, a toner cartridge to supply a toner to the developing device, a first memory which is provided in the toner cartridge and in which data of a toner characteristic is previously stored, a toner use amount detection mechanism to detect a parameter value for obtaining a toner use amount, a second memory which is provided in the image forming unit and in which the parameter value and a threshold of a toner use amount for performing a toner replacement operation are stored, and an arithmetic control mechanism which obtains the toner use amount based on the parameter value, compares the toner use amount with the threshold, determines necessity of the toner replacement operation, and executes the toner replacement operation based on the characteristic data.
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