COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001CHAPTER 4 IMAGE FORMATION SYSTEM4-1 P1 Outline of Processes1.1 OutlineT04-101-01 shows the functions of and the methods used in the image formation system:Item DescriptionPhotosensitive drum OPC (30-mm dia.)drum cleaning cleaning bladeDeveloping assembly Developing cylinder (20-mm dia.)Development method:dry, 1-component, toner projectionToner:magnetic, negativePre-exposure (LAMP2) Fuse lamp (8 pc.)ON/OFF control (activated in sync with main motor)Drum sensor (U701) Primary charging roller DC bias corrected to temperature aroundphotosensitive drumEnvironment sensor (S3) Primary charging roller AC bias corrected to suit humidity readingPrimary charging roller auto Pad push-on typecleaningPrimary charging roller bias DC constant voltage control (-500 to -850 V)control AC constant current control (2000 to 2300 μA; about 1800 Hz)Developing bias control DC constant voltage control (0 to -650 V)AC constant voltage control (810 Vp-p; about 1800 Hz)Transfer charging roller bias Transfer bias:DC constant current control (switchingcontrol among +15 μA, +10 μA, +7 μA) + DC constant voltagecontrol (up to 7 kVmax)Cleaning bias: DC constant voltage control (-2.6 kV)Transfer guide bias control DC constant voltage (-600 v)Separation static eliminating DC constant voltage (switching between -2.3 KV and -3.0 KV)bias controlT04-101-01
