OPC drum surface potential | Sharp Digital Copier, AL-840, AL-800

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

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

Contents

Model AL-800/840 Operating Principle High voltage power PWB Fusing/paper exit sectionPower PWB Scanner read section Paper path and imaging Copy modeImage process and data flow Printer mode Data Flow Diagram Outline Paper feed, paper transport sectionMajor parts PUS PUS PE Sensor PempPIN Sensor Paper Size Operation Paper release operation Scanner reading section CCD CCD OUT MhpsCCD Sensor Asic IC8 Mcupcu PWB Wiring diagram Scanner writing section Block diagram Mcupcu PWB LSU PWB SyncICU PWB Image process section Image forming process diagram OPC Photoconductor section Development section Transfer/separation section CPU IC5 System diagram Developing unit Photoconductor drum unitTransfer charger roller Separation electrode Actual image forming process Paper Transfer roller Residual toner OPC drum OPC drum surface potential OPC drum surface potential and developing bias Model Fusing/paper exit sectionRTH Hlon HLL AC PowerComp AMP CN2 Drive section Wiring diagramAsic CPU IC5 MEN MMT0 MMT1 Major sections operations and functions Electrical section Power PWB High voltage power PWBCopy lamp control PWB Operation PWB Copyright 1998 by Sharp Corporation