Canon 7086 Series Service Manual - page 256
Chapter 7
7-10
F-7-14
SERVICE MODE:
- COPIER> OPTION> BODY> CNT-W/PR (enabling/disabling density variable mode during printing)
0: corrects the target value to permit variation of density during printing. (default)
1: does not permit variation of density during printing.
F-7-15
2. Adjustment of Density During Printing (scanner input)
WMUPR
WMUP
STBY
193
198
Potential sensor
Laser
Grid bias
Vg
Vg
Pw
Pw Vdc
Potential control
sequence started
VD
VL
Selected potential
VD
correction
value
Vdc
correction
value
1
2
3
4
5
6
7
8
9
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.2
1.2
+40V
+20V
F
value
Density
Darker
Lighter
Increases the laser power
(i.e., increasing the contrast)
to enable reproduction of fine lines,
each as wide as the diameter of a
single toner particle.
Laser power
correction
value
The laser power reaches the upper limit,
causing the machine to correct the
developing bias and to increase the
contrast.
Corrects the laser power/developing
bias to suit the F value setting.
COPIER > OPTION > BODY > CNT-W/PR
Set
Potential
control
Printing
started
Main power switch
OFF/ON
F value
changed
A laser power output Vdc
suited to the F value setting
is used.