| 摘要 |
A device for detecting a life of a developer that is used in an image forming apparatus includes a sensor that detects a toner density of the developer and provides an output. The device also includes a control unit, coupled to the sensor, that is configured to determine a toner density recovery time, the toner density recovery time being a length of time from a first time that a new toner source is added to the image forming apparatus to a second time that the sensor output reaches a predetermined value. The control unit determines whether the developer has reached a predetermined replacement point based on the toner density recovery time.
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