Control device for an image recorder

Claim 1

A control system for an image recorder having components including a replaceable photoconductive element and means for feeding sheets to the photoconductive member to thereby print images on said sheets comprising: first detecting means for detecting selected kinds of failures in the operation of selected ones of said components and for providing failure signals related to the detected failures; second detecting means for detecting the replacement of said photoconductive member in said image recorder and for providing replacement signals indicative of the replacement of said photoconductive member; a counter counting the number of sheets fed to said photoconductive member and for providing a corresponding count signals; a history data memory coupled to said first and second detecting means and to said counter to receive said failure signals, said replacement signals and said count signals and to store history data related to (i) the frequency of the replacement of photoconductive members; (ii) the respective number of sheets fed to each of a plurality of photoconductive members used in said image recorder, including the current photoconductive member and at least one previously used and now replaced photoconductive member; (iii) the number of failures of components which have occurred for each different photoconductive member comprised within said plurality of photoconductive members used in said image recorder; and (iv) the frequency of occurrence of each different kind of a selected plurality of kinds of failures; and display means coupled to said history data storing means for selectively displaying at any one time selected subsets of the history data stored therein.