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COPYRIGHT
©
2001 CANON INC. 2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001
CHAPTER 4 IMAGE FORMATION SYSTEM
4-1 P
1 Outline of Processes
1.1 Outline
T04-101-01 shows the functions of and the methods used in the image formation system:
Item Description
Photosensitive drum OPC (30-mm dia.)
drum cleaning cleaning blade
Developing assembly Developing cylinder (20-mm dia.)
Development method:dry, 1-component, toner projection
Toner:magnetic, negative
Pre-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 around
photosensitive drum
Environment sensor (S3) Primary charging roller AC bias corrected to suit humidity reading
Primary charging roller auto Pad push-on type
cleaning
Primary 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 (switching
control among +15 µA, +10 µA, +7 µA) + DC constant voltage
control (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 control
T04-101-01