Instructions on how to install the Image Transfer Unit, (ITU) kit.br 83 ITU Maintenance is displayed at each 120,000 copies whenbr the ITU Assembly needs to be replaced to maintain the print qualitybr and reliability of the printer. There are two assemblies, ITU assemblybr and Second Transfer Roll, in a maintenance kit.br Both should be replaced at the same time.br Maintenance warningbr in the Lexmark C770 and C780 series printers. Order all your Lexmarkbr printers, parts and supplies online at:br fastprinters.