2/2000Repair Analysis Procedures (RAP) 7-66 DocuPrint N24, N32, N40, N3225, and N4025RAP 7.44 BackgroundPROBLEMThere is toner contamination on all or part of the page. The contaminationappears as a very light gray dusting.1 Install a new EP Cartridge (PL 7.2). The problem is still present.Y N| Problem solved.2 Remove the Upper Rear Cover Assembly (REP 4.1.3). Generate a System Controller Test Print(5.5.2.2.2) for Version 1.7X and below, (5.6.2.2.2) for Version 1.8X, or (5.7.2.12.2) for Version 2.0and switch OFF printer power halfway through the print cycle. Open the Left Upper Cover. Openthe Drum Shutter. Hand rotate (counterclockwise) the Main Drive Motor to advance the Drum farenough so you can see the developed image area on the Drum before it reached Transfer. Theimage on the drum is completely clean; without any noticeable background toner.Y N| Replace the Laser Assembly (REP 4.6.1).3 Generate a System Controller Test Print and switch OFF printer power halfway through the printcycle. Open the Left Upper Cover. Inspect the image on the paper. The image on the paper iscompletely clean; without any noticeable background toner.Y N| Replace the BTR Assembly (REP 4.5.2).4 Generate another System Controller Test Print and switch OFF printer power when the print ishalfway through the Fuser. Open the Left Upper Cover. Examine the paper areas before theimage enters the Fuser and after the image exits the Fuser. The paper is clean before it entersthe Fuser, but there is background on the paper when it exits the Fuser.Y N| Replace each component listed below, one at a time, until the problem disappears.HVPS Assembly (REP 4.10.4)Printer Engine Controller PWB (REP 4.10.6)System Controller PWB (REP 4.10.7)5 Replace the Fuser Assembly (REP 4.7.1).
