CHAPTER 4 IMAGE FORMATION SYSTEMCOPYRIGHT © 1999 CANON INC. CANON NP6320 REV.0 DEC. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-1I. IMAGE FORMATION SYSTEMA. OutlineThe basic structure of the image formation system is as shown below.• Scanning lamp control system• Primary/transfer corona current and grid bias voltage control system• Controlling developing bias• Document density measurement system• Developing assembly/Drum cleaner• BlankingFigure 4-101Scanning lampAE sensorLampdriverPCBLensHigh-voltagetransformer(HVT)DC controllerPCBGRID ON signal (GRDON)Blank exposure shutterPre-exposure lampPhotosensitivedrumHVTON command (HVTON*)(ACBON*)(DCBC)DC BIAS control commandGRID BIAS control signal (GRBC)AC BIAS ON command(PEXP)PRE-EXPOSURE LAMP DRIVE command(LAON)Lamp check signalLAMP ON commandStatic charge eliminator bias(LIC)AELIGHT INTENSITYCONTROL commandTransfer corona assemblyhigh voltageDeveloping bias
