Samsung CLX-8640ND - 4.7. Image quality problems and solutions

4.Troubleshooting
4.7.Imagequalityproblemsandsolutions
Print-qualitydefectscanbeattributedtoprintercomponents,consumables,media,internalsoftware,externalsoftware
applicationsandenvironmentalconditions.
Tosuccessfullytroubleshootprint-qualityproblems,asmanyvariablesaspossiblemustbeeliminated.
Therststepistogenerateprintsusingprintablepagesembeddedintheprinteronlaserpaper.Thepapershouldbefrom
anunopenedreamthathasbeenacclimatedtoroomtemperatureandyoushouldensurethatgenuineSamsungToner
isinstalledintheprinter.
1)VerticalwhitebandandDarkband
StepSectionCheckitemResultAction
1ThesurfaceoftheOPCdrumisscratched.YesReplacethedrumunit.
2Dirtyontheoutside.YesClean.
3Contactterminalsmakegoodconnection
betweeneachdrumunitandmachine.
NoCleancontactterminals.
4
DrumUnit
Developingbiascontactterminalmakes
goodconnection.
NoCleancontactterminalandcheck
terminalposition.
5ThesurfaceoftheLSUwindowisdirty.Y esCleantheLSUwindow.
6
LSU
Theproblemhasbeeneliminatedthrough
thechecksofstepsupto5.
NoReplacetheLSU.
7Originalisdamagedordirty.YesChangeoriginal.
8Scannerglasswhitesheetisdirty.YesCleanorreplacethepad.
9Originalglassisdirty.YesWipethesurfacecleanwithasoft
cloth.
10Removethescannerglass.Checkthe
followings.
•Mirrorisdirty.
•Lampisdirty.
•Reectorsaredirty.
YesCleanthecontaminatedpart.
CAUTION
Fragileparts!
11
Scanner
CheckCCDlenssurfaceagainst
contaminationorforeignobjects.
YesCleanthecontaminatedpart.
CAUTION
Fragileparts!
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