COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)I. BASIC OPERATIONSA. Functional ConstructionThe printer unit consists of four functional blocks: pick-up/feeding system, laser expo-sure system, image formation system, and control system.CHAPTER 2 BASIC OPERATION2-1Video interface PCBLaser driver PCB Laser scannerImage formation systemPrinter unitDelivery Fixing Separation RegistrationCassette 1Cassette 2Pick-up control MultifeederPick-up/feeding systemSecondary pre-transfer chargingITD cleaningroller chargingPre-exposurePrimary transferLaser exposureLaser exposure systemPhotosensitivedrum cleaningDevelopmentITD cleaningPrimary chargingSecondarytransferDuplexing unitReader unitPS/PCL boardControl systemDC controller PCBFigure 2-101Download free service manual at http://printer1.blogspot.com