| 摘要 |
An image forming apparatus includes: a developing device; a toner supply device that supplies toner to the developing device; and a toner supply detecting sensor that detects whether toner is supplied into the developing device; and a toner empty determination controller for determining that the toner inside the toner supply device is used up. Toner empty determination controller, based on the output result from the toner supply detecting sensor, modifies the toner empty determining threshold, based on which toner empty is determined.
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