| 摘要 |
<p>A detector (200) for detecting an abnormality in the developer passage (111) includes a sensing unit (131) for detecting a rotational speed of the developer pump (118), a rotational speed storage (151) for storing rotational speed reference of the developer pump (118), and a controller (125) for controlling the driving of the developer pump (118) and detecting the abnormality in the developer passage (111) on the basis of a comparison between a rotational speed calculation of the developer pump (118) according to a detection signal from the sensing unit (131) and a rotational speed reference of the developer pump (118) stored in the rotational speed storage (151). The detector (200) can be advantageously used for detecting a leak and/or a clogging in the developer passage (111) caused by a manufacture/assembly defect, or sediment of the developer sludge, and can inform the user about the abnormal state of the developer passage (111).</p> |
