Construction; Outline; Outline Of The Image Formation System(Ir105) - Canon ImageRunner iR8500 Series Service Manual

8.1 Construction

8.1.1 Outline

iR105i/iR105+ / iR9070 / iR85+ / iR8070
Table shows the major functions of the image formation system.
Item
Pre-exposure
Primary charging
Grid bias
Developing bias
Dust-collecting roller bias DC constant voltage control (ON/OFF control only; +1000
Pre-transfer charging
Transfer guide bias control DC constant voltage control (switched according to
Transfer charging
Separation charging
Potential
Wire auto cleaning

8.1.2 Outline of the Image Formation System(iR105)

iR105
The major changes made to the image formation system are as follows:
- photosensitive drum
- pre-transfer exposure LED (added)
- measures against overheating of developing unit
- measures for enhanced image quality for developing unit
- measures against overheating of cleaning blade
For others, see T02-502-01 for a table of differences.
T-8-1
Pre-exposure
LED array (64 LEDs)
ON/OFF control
DC constant current control (switched among 3 settings in
service mode)
DC constant voltage control (determined by potential control)
AC constant voltage control (ON/OFF control only)
DC constant voltage control (determined by potential control)
V)
AC constant current control (fuzzy control by an environment
sensor)
DC constant voltage control
temperature/humidity)
DC constant current control (fuzzy control by an environment
sensor)
DC constant current control (fuzzy control by an environment
sensor and toner deposit)
AC constant voltage control
[1] Setting the optimum grid bias.
[2] Setting the optimum laser output.
[3] Setting the optimum developing bias (DC).
[1] Primary charging wire
[2] Pre-transfer charging wire
Chapter 8
0006-9551
0006-9709
8-1