Samsung ML-451 Series - 4.2.3. Image Quality Problems; Vertical Black Line and Band; Vertical White Line

4.AlignmentandTroubleshooting
4.2.3.Imagequalityproblem
1)VerticalBlackLineandBand
Description:Straightthinblackverticallineoccursintheprintedimage.
CheckandcauseSolution
•DamageddeveloprollerintheImagingUnit.
DeformedDoctor-bladeorcleaning-blade.
•Scratchedsurfaceofthechargerollerintheimaging
unit.
Replacetheimagingunit.
Partlydepressionordeformationonthesurfaceofthe
transferroller.
Replacethetransferroller.
2)VerticalWhiteLine
Description:Whiteverticalvoidsoccursintheprintedimage.
CheckandcauseSolution
Foreignmatterstucksontothewindowofinternallensesof
LSUmirror.
CleantheLSUwindowwithrecommendedcleaner(IPA).
Cleanthewindowwithacleancottonswab.
ThelifeoftheimagingunithasbeenexpiredReplacetheimagingunit.
Someforeignsubstancesareonthewindowoftheimaging
unitframe.
Removetheforeignmatteroftheexposurewindow.
Ifthefuserisdefective,voidsoccurperiodicallyatthetop
ofablackimage.
Opentherearcover.Reinstallthefuserunit.
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