Samsung MultiXpress K7 Series - Horizontal Periodic Black Band or Dot

4.Troubleshooting
4.7.3.HorizontalperiodicBlackBandorDot
A.Typicalfaultyimages
B.Troubleshootingprocedure
StepCauseAction
1Checkifthehorizontalbandorspotoccursatapprox.
38mmperiod.
•Checkifthesurfaceofthechargerolleris
contaminatedorscratched.
1)Cleanthecontaminatedsurfaceonthecharge
rollerwithasoftcloth.
2)Ifthesurfaceisscratched,replacethedrumunit.
2Checkifthehorizontalbandorspotoccursatapprox.
188mmperiod.
•CheckifthesurfaceoftheOPCdrumis
contaminatedorscratched.
1)CleanthecontaminatedsurfaceontheOPCdrum
withasoftcloth.
2)Ifthesurfaceisscratched,replacethedrumunit.
3Checkifthechargerollercontactplateiscontaminated
orhasthedebris.
1)Cleanthechargerollercontactplate.
2)Iftheproblempersists,replacethedrumunit.
3)Iftheproblempersistsafterreplacingthedrum
unit,replacetheHVPSboard.
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