Samsung ML-4550 Service Manual

Also see for ML ML-4551N: Specifications Solution guide Quick install guide User guide Declaration of conformity

Contents

6.2 The cause and solution of Bad image6.2.1 Vertical Black Line and Band• Description 1. Straight thin black vertical line occurs in the printing.2. Dark black vertical band occur in the printing.Digital PrinterDigital PrinterDigital PrinterDigital PrinterDigital PrinterCheck and Cause Solution1. Deformed Doctor-blade or cleaning-blade,in print cartridge2. Scratched surface of the charge roller inthe print cartridge.3. Partly depression or deformation on thesurface of the transfer roller.1. If causes 1 and 2 occur in the printcartridge, replace the print cartridge andtry to print out.2. Replace the transfer roller if occurred asNo. 3.6.2.2 Vertical White Line• Description White vertical voids in the image.Digital PrinterDigital PrinterDigital PrinterDigital PrinterDigital PrinterCheck and Cause Solution1. Foreign matter stuck onto the window ofinternal lenses of LSU mirror.2. Foreign matter or toner particles betweenthe print cartridge roller and blade.(In case the life of the print cartridge hasbeen expired, white lines or light imageoccur in front of the image.)3. It may occur when Burr and foreignsubstances are on the window of theprint cartridge frame.4. If the fuser is defective, voids occurperiodically at the top of a black image.5. It may occur when foreign substancesare on the OPC Drum.6. Partly depression or deformation on thesurface of the transfer roller1. Foreign matter stuck onto the window :Clean the LSU window with recommend-ed cleaner(IPA) Clean the window with aclean cotton swab.2.. Replace the print cartridge.3. No 3. : Remove the foreign matter andburr of the exposure window.(print cartridge)4. No. 4. : Open the front cover and checkribs that corresponds to the position ofthe voids. Remove if found.5. If the problems are not solved, replacethe print cartridge.6. Replace the transfer roller if occured asNO.6Service ManualTroubleshooting6 -2 Samsung Electronics