IMAGE FORMING APPARATUS AND METHOD FOR DETERMINING MALFUNCTION OF TEMPERATURE SENSOR IN THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of more accurately determining whether malfunction occurs or not in a temperature sensor detecting a surface temperature of a heat roller in a non-contact manner, and to provide a method for determining malfunction of temperature sensor in the image forming apparatus.;SOLUTION: A control portion determines whether a malfunction occurs or not in the roller temperature sensor and an ambient temperature sensor by comparing a trajectory (temporal behavior) actually created by two-dimensional data on a temperature table with a target trajectory. In other words, the control portion successively integrates a prescribed weight for each transition from one element to the adjacent element corresponding to a trajectory of two-dimensional data on the temperature table, and determines whether or not a malfunction occurs in the roller temperature sensor and the ambient temperature sensor, based on the integrated weight.;COPYRIGHT: (C)2009,JPO&INPIT