Samsung CLP-775ND Series - LSU (Laser Scanner Unit)

2.Productspecandfeature
2.2.4.4.LSU(LaserScannerUnit)
ItisthecorepartoftheLBPwhichswitchesfromthevideodatareceivedtothecontrollertotheelectrostaticlatentimage
ontheOPCdrumbycontrollinglaserbeam,exposingOPCdrum,andturningprincipleofpolygonmirror.TheOPCdrumis
turnedwiththepaperfeedingspeed.The/HSYNCsignaliscreatedwhenthelaserbeamfromLSUreachestheendofthe
polygonmirror,andthesignalissenttothecontroller.Thecontrollerdetectsthe/HSYNCsignaltoadjusttheverticallineof
theimageonpaper.Inotherwords,afterthe/HSYNCsignalisdetected,theimagedataissenttotheLSUtoadjusttheleft
marginonpaper.Theonesideofthepolygonmirrorisonelineforscanning.
OPC Drum
Photo Diode
LD Driver circit
Protector panel
LD(Laser Diode)
Polygon Mirror
Polygon Motor
Motor Driver
TroubleFailureAnalysis
PolygonMotorErrorTheRotationofPolygonMotorcannotreachstable.
HsyncErrorThoughtherotationofPolygonMotorreachstable,thesignalofHsyncisnotoccurred.
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