Samsung CLP-775ND Series - Image Quality and Other Operational Issues

4.AlignmentandTroubleshooting
4.2.3.Imagequalityproblems
1)VerticalBlackLineandBand
•Description
a)Straightthinblackverticallineoccursintheprintedimage.
b)Darkblackverticalbandsoccursintheprintedimage.
CauseandCheckPointSolution
Checkifthesurfaceofthechargerollerisscratchedor
contaminated.
Replacethetonercartridgeandtestagain.
CheckiftherearegroovesonthecircumferenceoftheOPC
drum.
Replacethetonercartridgeandtestagain.
CheckifthecleaningbladeisdamagedReplacethetonercartridgeandtestagain.
IsthechargerollerofPTBunitdamaged?CleanthechargerollerofPTBunit,orreplacethePTBunit.
Checkifpapertransferbeltisdamagedorcontaminated.ReplacethePTBunitandtestagain.
2)VerticalWhiteLine
•Description:Whiteverticalvoidsintheimage.
CauseandCheckPointSolution
CheckiftheLSUwindoworinternallensesofLSUis
contaminated.
CleantheLSUwindowwithrecommendedcleaner(IPA).
Cleanthewindowwithacleancottonswab.Ifdirtisinside
theLSU,replacetheLSU.
Checkiftherearescratchesonthecircumferenceofthe
OPCdrum.
Replacethetonercartridge.
Checkiftherearescratchesonthecircumferenceofthe
developingroller.
Replacethetonercartridge.
Foreignobjectsinsidethetonercartridge.Replacethetonercartridge.
Checkifthereareverticalscratchesonthetransferunit.ReplacethePTBunit.
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