Image Adjustments; Image Parallelism Adjustment - Canon imageRUNNER 1019J Service Manual

12.1 Image Adjustments

12.1.1 Image parallelism adjustment

1) Create a test chart, load it in the ADF, and make a
copy of it.
Test Sheet
10mm
(feeding direction)
10mm
F-12-1
2) Compare the lines at the end of the test chart with
those on the copy for parallelism. Measure
dimensions A and B at the end of the copy and
adjust the amount of skew (the range shown in the
table) to within the spec.
Standard: A-B within ±1.7 mm
Test Sheet
(feeding direction)
F-12-2
<Adjustment method>
This machine allows parallelism between the leading
and trailing edges of the image to be adjusted by
changing the positions where the front and rear
springs of the registration unit are hooked.
There are five types of spring hooking positions.
(One step = Approx. 0.6 mm)
T-12-1
Settings Spring positions at
the back of host
machine
1 +1
2 +1
3 0
4 -1
5 -1
0014-5881
because they are the same as the spring position
position "0t the front of the host machine
10mm
m
m
0
1
A
Rear side
B
Front side
Spring positions at
the front of host
machine
-1
0
0
0
1
MEMO:
Parallelism varies depending on the difference in the
spring pressure between the front and rear springs.
For example, the spring position "0"at the back of the
host machine and the spring position "-1"at the front
of the host machine are not shown in this document
"+1"at the back of the host machine and the spring
respectively.
-1
0
+1
-1
0
+1
Front
F-12-3
1) Check the current hooking positions of the left and
right springs of the registration roller. Change the
spring hooking positions in reference to the table
below. (They are adjustable in five steps. One step
= Approx. 0.6 mm)
Chapter 12
Rear