Samsung ML-451 Series - Light Image; Dark or Black Page; Uneven Density

4.AlignmentandTroubleshooting
5)Lightimage
Description:Theprintedimageislight,withnoghost.
CheckandcauseSolution
Tonercartridgelifeisexpired.Replacethetonercartridge.
HVPSterminaliscontaminated.Cleanthecontaminatedterminal.
TheoutputfromtheHVPSisabnormal.ReplacetheHVPSboard.
6)DarkorBlackpage
Description:Theprintedimageisdarkorblack.
CheckandcauseSolution
Checkifthehighvoltageterminaliscontaminated.Cleanthehighvoltageterminal.
Thechargingrollerisdefective.Replacetheimagingunit.
TheoutputfromtheHVPSisabnormal.ReplacetheHVPSboard.
7)UnevenDensity
Description:Printdensityisunevenbetweenleftandright.
CheckandcauseSolution
•Thepressureforceontheleftandrightspringsofthe
transferrollerisnoteven.
•Thespringsaredamaged.
•Thetransferrollerisimproperlyinstalled.
1)RemovethetransferrollerAssy.
2)CheckifthetransferrollerAssyhasanywrongpart.
3)ReplacethetransferrollerAssy.
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