G. Controlling Blank Exposure1. OutlineThe copier uses the reflecting plate to direct the light of the pre-exposure lamp to thephotosensitive drum by way of executing blank exposure, thereby blanking (whiting) outthe non-image areas and areas between copies.The area of blank exposure is controlled by the two slide shutters and one open/closeshutter.Figure 4-115COPYRIGHT © 1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 4 IMAGE FORMATION SYSTEM4-18Lens motor MChange solenoid (SL1)Slide shutter (rear)Reflectiong platefor size blankingGear AGear BReflectiong platefor full blankingBlank shuttersolenoid(SL3)Pre-exposure lampOpen/close shutterBlanking shutter homeposition sensor (PS3)Slide shutter(front)DC controller PCBBlank shutter solenoid drive signal(BSSLD*)Blank shutter home positiondetection signal (BSHP)Change solenoid drive signal (CHSLD*)
