COPYRIGHT © 1999 CANON INC. CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.CHAPTER 6IMAGE FORMATION SYSTEMThis chapter provides descriptions on the copier's image processing operations,functions of each operation, relationships between electrical and mechanicalsystems, and timing at which each associated part is turned on.I . PROCESSES ............................. 6-1A. Outline ................................... 6-1B. Basic Sequence of Operations(image formation) .................. 6-3II . POTENTIAL CONTROL ............. 6-5A. Outline ................................... 6-5B. Determining the Optimum GridBias ....................................... 6-8C. Grid Bias Corrective Control .. 6-8D. Determining the Optimum LaserOutput.................................... 6-9E. Laser Output Corrective Control.............................................. 6-9F. Determining the OptimumDeveloping Bias .................. 6-10G. Potential Control forTransparency Mode ............ 6-11H. Target Potential Correction inEach Mode .......................... 6-12III . CONTROLLING THE CHARGINGMECHANISMS ......................... 6-16A. Controlling the Primary ChargingMechanism .......................... 6-16B. Dust-Collecting Roller Bias .. 6-20C. Controlling the Pre-TransferCharging Mechanism .......... 6-21D. Controlling the Transfer GuideBias ..................................... 6-25E. Controlling the Transfer ChargingMechanism .......................... 6-27F. Controlling Separation Charging............................................ 6-32IV . DEVELOPING ASSEMBLY ...... 6-36A. Outline ................................. 6-36B. Controlling the DevelopingAssembly ............................. 6-37C. Controlling the Toner CartridgeDrive Mechanism ................. 6-38D. Controlling the Developing Bias............................................ 6-39E. Detecting the Toner Level andControlling the Toner SupplyMechanism .......................... 6-41V . DRUM CLEANER UNIT ........... 6-45A. Outline ................................. 6-45B. Detecting the Waste Toner (casefull condition) ....................... 6-46VI. CONTROLLING THE DRUMHEATER ................................... 6-48A. Outline ................................. 6-48VII .DISASSEMBLY/ASSEMBLY .... 6-49A. Photosensitive Drum Unit .... 6-50B. Parts Associated with theProcess Unit ........................ 6-55C. Charging Wire ..................... 6-60D. Process Unit ........................ 6-66E. Developing Assembly .......... 6-69F. Drum Cleaner Unit ............... 6-75G. Separation Claw/SeparationClaw Drive Assembly........... 6-79
