Sharp Digital Copier, AL-840, AL-800 service manual OPC drum surface potential and developing bias

Page 25

d. OPC drum surface potential	<2> OPC drum surface potential and developing bias
<1> OPC drum surface potential shift in printing	voltage during developing
<1> OPC drum surface potential shift in printing

-850V V)-(

-310V potentialsurface drumOPC

Laser

beams Dark area potential

Toner attraction	Developing
potential	bias

Light area potential

Charging/	Exposure Residual toner Transfer			Charging
cleaning	collection/
	Development

Time (OPC drum rotating angle)

-310V

OPC drum surface potential (-V)

Start

During developing

End

Dark area potential

Developing bias

Light area potential

Time (OPC drum rotating angle)

1 – 24

Image 25

Contents Model AL-800/840 Operating Principle High voltage power PWB Fusing/paper exit sectionPower PWB Scanner read sectionPaper path and imaging Copy modeImage process and data flow Printer mode Data Flow DiagramOutline Paper feed, paper transport sectionMajor parts PUSPUS PE Sensor PempPIN Sensor Paper SizeOperation Paper release operation Scanner reading section CCD CCD OUT MhpsCCD SensorAsic IC8 Mcupcu PWB Wiring diagramScanner writing section Block diagramMcupcu PWB LSU PWB SyncICU PWB Image process section Image forming process diagram OPC Photoconductor sectionDevelopment section Transfer/separation section CPU IC5 System diagramDeveloping unit Photoconductor drum unitTransfer charger roller Separation electrodeActual image forming process Paper Transfer roller Residual toner OPC drum OPC drum surface potential OPC drum surface potential and developing biasModel Fusing/paper exit sectionRTH Hlon HLL AC PowerComp AMP CN2Drive section Wiring diagramAsic CPU IC5 MEN MMT0 MMT1Major sections operations and functions Electrical sectionPower PWB High voltage power PWBCopy lamp control PWB Operation PWB Copyright 1998 by Sharp Corporation

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