Patent ID: 6538453
Filing Date: 2003-03-25
Classification: G03G

Abstract:
In a reproduction apparatus having a logic and control unit, and a fuser assembly including a heated fuser roller and a temperature sensing system having a resistance type temperature sensor for sensing the temperature of such fuser roller by utilizing heat to change sensor resistance to provide an electrical signal corresponding to the fuser temperature, for the logic and control unit, a method for detecting erratically acting resistance in the resistance type temperature sensor, said method comprising the steps of:at preselected time intervals, taking temperature sensor readings and comparing one temperature reading to the previous temperature reading; determining, on the basis of a difference in such compared temperature sensor readings, if the temperature sensing system indicates that the temperature has changed by more than a predetermined amount that would be expected based on known operating characteristics of said fuser assembly; if the temperature sensing system indicates, from the determining step, that the temperature has changed by more than such predetermined amount, indicating that an error in the resistance of the resistance type temperature sensor has occurred; recording such error indication in an error log of the logic and control unit; and providing a response strategy for such an error.