Canon ImageRunner iR8500 Series, Руководство по обслуживанию, Страница: 348 / 1122

Chapter 8
8-8
F-8-8
T-8-3
8.3.3 Basic Sequence
0008-8688
iR85+
Figure shows the basic sequence (timing) of operations related to potential control.
F-8-9
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
Copy Start
key ON Potential
control Potential
control Potential
control
Fixing assembly temperature at 195˚C
(end of fixing assembly warm-up)
Copy Start
key ON
WMUPR WMUP STBY
195˚C 200˚C
Drum motor(M0)
Primary
charging bias
(DC)
Developing bias
AC bias (AC)
Developing bias
(DC)
Grid bias
Laser
Potential stabilization sequence
Fixed value
Optimum grid bias
determined Optimum laser output
determined
Potential control
Potential control is as when the main power switch is turned on.
A series of charging operations is executed to
stabilize the potential of the drum.
To prevent stray toner, the developing bias
is turned off for non-image areas.
Optimum laser output
determined
Transparency mode
potential control