| 摘要 |
Provided is an electrophotographic image forming apparatus. The electrophotographic forming apparatus includes a light-emitting portion, a light-receiving portion, a waste toner sensing unit which is pivotably installed in a main body where the waste toner container is attachably and detachably mounted between the light-emitting portion and the light-receiving portion, intercepts light irradiated from the light-emitting portion when the waste toner container is not mounted in the main body, and does not intercept light when the waste toner container is mounted in the main body, such that a voltage output from the light-receiving portion is compared with a preset voltage and whether the waste toner container is mounted, the replacement time of the waste toner container can be sensed.
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