
Chapter 8
8-9
F-8-10
T-8-4
8.3.4 Determining the Optimum Grid Bias
0006-9596
iR105i/iR105+ / iR9070 / iR85+ / iR8070
A grid bias is selected so that the surface potential of the drum will be identical to the target potential (the primary charging bias is fixed).
F-8-11
8.3.5 Grid Bias Corrective Control
0006-9598
iR105i/iR105+ / iR9070 / iR85+ / iR8070
Related Service Mode
COPIER> OPTION> BODY> PO-CNT
(potential control on/off)
0: disable potential control.
1: enable potential control. (default)
COPIER> ADJUST> V-CONT> EPOTOFST
(potential sensor offset value input)
If you have replaced the image processor
PCB or initialized the RAM on the image
processor PCB, enter the value recorded on
the service label.
COPIER> ADJUST> V-CONT> VL-OFST
(VL target potential offset input)
COPIER> ADJUST> V-CONT> VD-OFST
(VD target potential offset value input)
COPIER> FUNCTION> DPC> OFST
(potential sensor offset adjustment)
For adjustments, see descriptions on
electrical parts.
[1] The control panel power switch is turned on.
[2] The front door is opened/closed.
10 min
60 min
The charging characteristics are likely to have
stabilized at this point, and potential control will
not be executed after this point.
Potential control is executed 10 min and 60
min after the temperature of the fixing
assembly has reached 195˚C.
Main power
switch ON
Potential
control for
transparency
Print com-
mand
Potential
control
Potential
control
Potential
control
Fixing assembly temperature at 195˚C
(end of fixing assembly warm-up)
Print com-
mand
WMUPR
WMUP
STBY
195˚C
200˚C
Potential sensor
Grid bias
500 V
600 V
700 V
Measurement
(VD1)
Measurement
(VD2)
Measurement
(VD3)
Vg
500V 600V 700V
VD1
VD2
VD3
Grid bias
If the target VD is attained basde on this
measurement, control is ended; otherwise,
corrective control will start.
The relationship between the surface potential of
the drum (VD) and the gird bias is obtained based
on measurements taken several times.
Charging
characteristic curve
A grid bias (VG) needed to attain the
target VD is selected.
Potential control
sequence started
Primary charging
bias (DC)
Measurement
(targetVD)
Содержание ImageRunner iR8500 Series
Страница 1: ...Apr 5 2005 Service Manual iR8500 Series ...
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