Canon imageRUNNER ADVANCE C5255 Series Service Manual page 109

2
Technology > Image Formation System > Controls > Image stabilization control
● Color displacement correction control
This control corrects uneven exposure of the laser scanner unit or color displacement caused
by uneven rotation of the drum or ITB
Patch sensor
(front)
(UN47)
2 Technology > Image Formation System > Controls > Image stabilization control
ITB belt
Registration sensor
(rear)
(UN48)
Patch sensor
(Center)
(UN49)
DC controller(UN1)
F-2-103
Control detail
1) DC Controller creates the patch pattern of each color on the ITB.
2) DC Controller compares those patterns with the standard value backed up in the DC
Controller by reading the patch sensor (front, center, rear) (UN47 to 49) and detects the
color displacement amount.
3) Based on the detected result as above, the DC Controller executes correction depending
on the color displace amount.
Timing to start
During
print
At for
Control type
power every
ON 360
prints
in total
Correction in Write-start
Yes
main scanning correction
direction
Correction
of overall Yes
magnification ratio
Correction of odd
magnification ratio Yes
Correction in Write-start
Yes
sub scanning correction
direction
Correction of
Yes
skewed image
During
print
for
Control description
every
100
prints
in total
Change write-start timing in main
Yes Yes
scanning direction
Increase/reduce the number of pixels in
Yes No main scanning direction (at both edges
of image)
Increase/reduce the number of pixels
Yes No in main scanning direction (at center of
image)
Change write-start timing in sub
Yes No
scanning direction
Change position of laser exposure by
Yes No
the laser scanner unit
2-71
T-2-39
2-71