METHOD FOR DETERMINING ABNORMALITY OF TEMPERATURE SENSOR AND IMAGE FORMING APPARATUS USING THE SAME

摘要

A method for determining abnormality of a temperature sensor and the image forming apparatus, the method comprises: detecting an actual temperature of a fixing apparatus and an input voltage; calculating an actual temperature variation amount in a predetermined time period; comparing the detected input voltage and a predetermined voltage; comparing the calculated actual temperature variation amount and a first reference temperature variation amount if the input voltage is greater than the predetermined voltage; determining that the temperature sensor is abnormal if the actual temperature variation amount is less than the first reference temperature variation amount; comparing the calculated actual temperature variation amount and a smaller second reference temperature variation amount if the input voltage is equal to or less than the predetermined voltage; determining that the temperature sensor is abnormal if the actual temperature variation amount is less than the second reference temperature variation amount.