Abstract: A developer unit according to one example embodiment includes a housing having a reservoir for storing a developer mix that includes toner and magnetic carrier beads. A magnetic roll is mounted on the housing. An outer surface of a sleeve of the magnetic roll is positioned to carry the developer mix from the reservoir through a front portion of the magnetic roll that is exposed from the reservoir to permit transfer of toner from the outer surface of the sleeve to a photoconductive drum and back to the reservoir as the sleeve rotates in an operative rotational direction. An air vent is positioned along a rear portion of the magnetic roll for exiting air in the reservoir from the housing. An entire opening of the air vent is positioned vertically higher than the rotational axis of the sleeve when the developer unit is in an operative orientation.

Abstract: The invention is directed to a tamper-evident method of encrypting data relating to one or more print cartridges installed in an imaging device that includes triggering a gathering of data relating to the one or more print cartridges installed in the imaging device; recording a number of instances the triggering is performed; retrieving a previously encrypted data relating to the one or more print cartridges installed in the imaging device, the previously encrypted data gathered at a time prior to the triggering; and encrypting the gathered data using the previously encrypted data.

Abstract: The invention is directed to a method for performing failure analysis on an imaging device that includes retrieving an encrypted error log containing one or more error conditions that occurred on the imaging device, decrypting the retrieved encrypted error log, determining if the retrieved encrypted error log has been altered based on the decrypted error log, and upon determining that the retrieved encrypted error log has not been altered, performing failure analysis on the imaging device using the decrypted error log.

Abstract: The invention is directed to a tamper-evident method of encrypting data relating to one or more print cartridges installed in an imaging device that includes triggering a gathering of data relating to the one or more print cartridges installed in the imaging device; recording a number of instances the triggering is performed; retrieving a previously encrypted data relating to the one or more print cartridges installed in the imaging device, the previously encrypted data gathered at a time prior to the triggering; and encrypting the gathered data using the previously encrypted data.

Abstract: The invention is directed to a method for performing failure analysis on an imaging device that includes retrieving an encrypted error log containing one or more error conditions that occurred on the imaging device, decrypting the retrieved encrypted error log, determining if the retrieved encrypted error log has been altered based on the decrypted error log, and upon determining that the retrieved encrypted error log has not been altered, performing failure analysis on the imaging device using the decrypted error log.