Determining The Developing Bias - Canon iR5000 Service Manual

2.4 Determining the Developing Bias

The developing bias (Vdc) is determined as follows based on the drum surface potential
(VL2):
Vdc = VL2 + Vdc
In terms of copying potential, Vdc = 110 V
In terms of printing potential, Vdc = 85 to 110 V
(The potential for printing varies in keeping with the reading of the environment sensor to
ensure the reproduction of appropriate line widths.)
Potential sensor
Laser
Primary charging
Selected potential
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Fixing assembly temperature 195
WMUP
Primary current
level determined
Potential control sequence start
F04-204-01
2000 2000 2000 2000 CANON iR5000/iR6000 REV.0 JULY 2000
CHAPTER 4 IMAGE FORMATION SYSTEM
Potential sensor
Vpc
VD
Photosensitive drum
Developing
cylinder
˚C
WMUPR
VD VL1
VL2
Laser output
determined
Vpc Vpc
LP0
LP
Vdc
Vdc
200˚C
STBY
4-13 P