Patent ID: 7650088
Filing Date: 2010-01-19
Classification: G03G

Abstract:
1. An apparatus for recognizing error factors of a toner sensor for a developing device, the apparatus comprising: a toner container to hold toner; at least one developing device main body detachably provided to the toner container to receive the toner supplied from the toner container; at least one developing device toner amount detector including a toner sensor to sense an amount of the toner filled in the developing device main body and to output a sensor value corresponding to the sensed amount; a controller to compare the output sensor value with one or more of a plurality of set values, to identify one of a plurality of error types associated with the toner sensor in accordance with the comparison result, each of the plurality of error types indicated by error information associated with a respective predetermined relationship between a sensor value and one of the plurality of set values, and to control a display of the recognized error information; and a display unit controlled by the controller to display the recognized error information.