AACCTTIIOONN YYEESS NNOOExtended exposure tolight may cause printquality problems.WWaarrnniinngg:: Do nottouch thephotoconductor drumunder the colorimaging kit and blackimaging unit. Doingso may affect thequality of future printjobs.2 Insert the black imaging unit,and then insert the colorimaging kit.3 Print the document.Do horizontal dark lines appear onprints?Vertical Dark LinesNote: Before solving the problem, print the Print Quality Test Pages. From the control panel, navigate toSSeettttiinnggss >> TTrroouubblleesshhoooottiinngg >> PPrriinntt QQuuaalliittyy TTeesstt PPaaggeess. For non-touch-screen printer models, press OOKK tonavigate through the settings.210 Xerox® C410 Color Printer User GuideTroubleshooting