Patent ID: 8385756

Claim:
A failure diagnosis device for a failure of a fixing section of an image forming device, comprising: a first feature quantity computing unit that computes a first feature quantity representing an average of a plurality of driving loads of the fixing section recorded by a driving load recording unit that records the driving load acquired by a driving load acquiring unit that acquires the driving load; a second feature quantity computing unit that computes a second feature quantity representing a deviation of the plurality of the driving loads recorded by the driving load recording unit; a diagnosis unit that performs failure diagnosis including estimation of a cause of the failure of the fixing section using at least the first feature quantity computed by the first feature quantity computing unit and the second feature quantity computed by the second feature quantity computing unit; and a third feature quantity computing unit that computes a third feature quantity representing a maximum value among the plurality of the driving loads recorded by the driving load recording unit, wherein the diagnosis unit performs failure diagnosis using at least the first feature quantity computed by the first feature quantity computing unit, the second feature quantity computed by the second feature quantity computing unit, and the third feature quantity computed by the third feature quantity computing unit.