2/2000Repair Analysis Procedures (RAP) 7-60 DocuPrint N24, N32, N40, N3225, and N4025RAP 7.38 Horizontal Band DeletionsPROBLEMThere are areas of the image that are extremely light or missing entirely. Thesemissing areas form wide bands that run horizontally across the page,perpendicular with the direction of paper travel.1 The paper is smooth (not wrinkled) and undamaged.Y N| Replace with fresh, dry paper.2 Install a new EP Cartridge (PL 7.2). The problem is still present.Y N| Problem solved.3 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.Before Transfer, the toner image on the drum was normal and without horizontal band deletions.Y N| Replace the HVPS Assembly (REP 4.10.4). If the problem is still present, refer to the wiringdiagrams Section (6) and check for a broken wire or loose connection betweencomponents in the Xerographic sections of the printer.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. The image on the paper is normal before it enters the Fuser (nohorizontal band deletions).Y N| Replace each component listed below, one at a time, until the problem disappears.Replace the BTR assembly (REP 4.5.2).EP Cartridge Connector and Contact Springs (PL 7.2)Printer Engine Controller PWB (REP 4.10.6).5 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 after the imageexits the Fuser. There are horizontal band deletions visible when it exits the Fuser.Y N| Problem solved.6 Replace the Fuser Assembly (REP 4.7.1).
