COPYRIGHT © 1997 CANON INC. CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 4IMAGE FORMATION SYSTEMThis chapter discusses the principles of how images are formed. It also explains the timing at whichthe various units involved in image formation are operated, and shows how they may bedisassembled/assembled and adjusted.I. PROCESSES .....................................4-1A. Controlling the Drum SurfacePotential .......................................4-1B. Controlling the Intensity of theScanning Lamp .............................4-6C. Controlling the Primary/TransferCorona Current..............................4-11D. Controlling the Separation/Pre-Transfer Corona Current ...............4-15E. Controlling the Blank ExposureLamp (LED) ...................................4-19F. Drum Heater Circuit.......................4-22G. Cleaning the Primary ChargingWire ...............................................4-25H. Pre-Transfer/Transfer/SeparationCharging Wire AutomaticCleaning Mechanism .....................4-26II. DRUM CLEANING ASSEMBLY/DEVELOPING ASSEMBLY ...............4-28A. Outline ...........................................4-28B. Detecting the Level of Toner andControlling the Supply Operation ..4-30C. Controlling the DevelopingBias/Roller Electrode .....................4-32D. Detecting the Waste TonerFeeding Screw (locking)................4-38III. DISASSEMBLY AND ASSEMBLY......4-39A. Scanning Lamp Assembly.............4-39B. Standard White Plate ....................4-41C. Pre-Exposure Lamp Unit ...............4-43D. Blanking Exposure LampAssembly .......................................4-44E. Photosensitive Drum .....................4-45F. Potential Sensor Assembly ...........4-48G. Primary Charging Assembly..........4-48H. Pre-Transfer Charging Assembly ..4-49I. Transfer/Separation ChargingAssembly .......................................4-49J. Charging Wire ...............................4-53K. Developing Assembly ....................4-60L. Hopper Assembly ..........................4-66M. Drum Cleaner ................................4-67N. Separation Claw/SeparationClaw Drive Assembly ....................4-71O. Waste Toner Feeding Assembly....4-72Download service manual and resetter printer at http://printer1.blogspot.com
