Canon imageRUNNER ADVANCE C2030, Service Manual

Page: 78 / 968

2
2
2-44
2-44
Process/Operation > Image Formation System > Overview > Print Process
Process/Operation > Image Formation System > Overview > Print Process
Static latent image
formation block
1 Primary
charging
The surface of the Photosensitive Drum is charged to make a
uniform negative potential.
2 Laser
exposure
Emission of the laser light forms a static latent image on the
surface of the Photosensitive Drum.
(Image exposure: laser exposed area becomes image area)
Developing block 3 Developing With the non-magnetic, 2-component AC developing method,
toner that has been negatively charged by the Developing
Cylinder is attached to the Photosensitive Drum.
Transfer block 4 Primary
transfer
Toner on the surface of the Photosensitive Drum is transferred
to the ITB by applying positive potential from back side of the
ITB.
5 Secondary
transfer
Toner on the ITB is transferred to the paper by applying
positive potential to the Secondary Transfer Outer Roller.
6 Separation With the curvature separation method, the paper is separated
from the ITB. In the case of thin paper which has low elastic
force, the Static Eliminator reduces potential on the back side
of paper to make the thin paper to be separated easily.
Fixing block 7 Fixing The toner on the paper is fixed on the paper by heat and
pressure.
ITB cleaning block 8 ITB cleaning The Cleaning Blade removes the residual toner attached on
the ITB.
Drum cleaning
block
9 Drum
cleaning
As well as removing potential on the Drum by the Upstream
Brush and the Downstream Brush, character of residual toner
on the Drum is adjusted so that residual toner on the Drum is
collected in the Developing Assembly.
T-2-21
● Bias Types
The following 9 types of bias are used with this machine.
Bias name Bias types
Bias value
(Reference value)
Application location
Primary charging bias (DC) DC Approx. --600V Primary Charging Roller
Primary charging bias (AC) AC Approx. 1.5kVpp
Developing bias (DC) DC Approx. -450V Developing Cylinder
Developing bias (AC) AC Approx. 1.7kVpp
Upstream Brush bias (DC) DC Approx. 200V Upstream Brush
Upstream Brush bias (AC) AC Approx. 400Vpp
Downstream Brush bias (DC) DC Approx. -1000V Downstream Brush
Primary transfer bias DC Approx. 300V Primary Transfer Roller
Secondary transfer bias DC Approx. 2.5kV Secondary Transfer Outer
Roller
The abovementioned biases are generated by the 5 High Voltage PCBs and are also supplied
to the loads used in printing process.
Secondary Transfer
Outer Roller
Charging AC+DC
Developing
AC+DC
Primary
transfer DC
Secondary
transfer DC
Y
Y
M
C
Bk
M
Bk
C
DC controller
PCB (UN9)
Primary
charging
PCB (UN6)
Upstream
/downstream
auxiliary
high voltage
PCB (UN8)
Secondary
transfer
high-voltage
PCB (UN5)
Primary
transfer
high-voltage
PCB (UN4)
Photosensitive
Drum
Primary
Charging
Roller
Developing
Cylinder
Secondary Transfer
Inner Roller
Brush
Charging
AC+DC
Developing
high-voltage
PCB (UN7)
Primary Transfer
Outer Roller
T-2-22
F-2-60