Canon imageRUNNER ADVANCE C350 series Service Manual page 99

2
Technical Explanation > Image Formation System > Overview > Print Process
Static latent image 1 Primary To charge the surface of photosensitive drum to be uniformed
formation block charging negative potential
2 Laser To create static latent image on the surface of photosensitive
exposure drum by emitting laser light (image exposure: laser exposure
area becomes image area)
Developing block 3 Developing To attach negatively-charged toner from the developing
cylinder to the photosensitive drum by Dry, 2-component AC
developing.
Transfer block 4 Primary To apply positively-charged potential from the back surface of
transfer ITB to transfer toner on the surface of photosensitive drum to
ITB.
5 Secondary To apply positively-charged potential to the secondary
transfer transfer outer roller to transfer toner on the ITB to the paper.
6 Separation To separate paper from the ITB by curvature separation
method. In the case of thin paper which has low elastic force,
the static eliminator reduces potential on the surface of paper
to separate thin paper more easily.
Fixing block 7 Fixing To fix toner on the paper with heat and pressure.
ITB cleaning block 8 ITB cleaning To remove residual toner on the ITB by the cleaning blade.
Drum cleaning 9 Drum To remove residual toner on the photosensitive drum by the
block cleaning cleaning blade.
2 Technical Explanation > Image Formation System > Overview > Print Process
● Bias Types
The following 5 types of bias are used with this machine.
Bias
Bias name
types
Primary charging bias DC
(DC)
Developing bias (DC) DC
Developing bias (AC) AC
Primary transfer bias DC
Secondary transfer DC
bias
The abovementioned biases are generated by the 3 High Voltage PCBs and are also supplied
to the loads used in printing process.
T-2-23
Y
M
Bias value
Application location
(Reference value)
-1600 to 0 V Primary Charging Secondary Transfer
Roller High-voltage PCB
(UN02)
-700 to 0 V Developing Cylinder Developing High-
voltage PCB
Amplitude: 1750 V
(UN06)
0 to 3500 V Primary Transfer Primary Transfer
Roller High-voltage PCB
(UN03)
-1600 to 6000 V Secondary Transfer Secondary Transfer
Outer Roller High-voltage PCB
(UN02)
Primary
Primary Transfer DC
Transfer
High-voltage
PCB (UN03)
Secondary
C
Bk Transfer
High-voltage
Secondary
PCB (UN02)
Transfer DC
Charging DC
Developing
High-voltage
PCB (UN06)
Developing AC+DC
2-56
Control PCB
T-2-24
DC Controller
PCB (UN04)
F-2-72
2-56