Patent ID: 8819498

Claim:
A method for determining an end of life condition for at least one replaceable unit in a multifunction device comprising: with a processor, initiating an operations counter associated with the at least one replaceable unit to generate a number of operations for the unit; storing, in an associated memory, fault code occurrences generated by the multifunction device; calculating a rate of fault code occurrences for the at least one replaceable unit; comparing the calculated rate of fault code occurrences to a preselected fault code threshold in response to the number of operations relative to a preselected operations threshold; determining the existence of an end of life condition for the at least one replaceable unit in accordance with the number of operations and a result of the comparison of the rate of the fault code occurrences for the replaceable unit; and generating a notification indicative of an end of life condition of the at least one replaceable unit.