Setting Auto Gradation Correction; Checking The Image/Operation; Adjusting The Horizontal Registration - Canon iR C6800 Series Service Manual

Chapter 2
2.2.20 Setting Auto
Gradation Correction
1) Clean the reading glass surface of the machine's
copyboard.
2) Press the User Mode key.
3) Make the following selections: adjust/cleaning>
auto gradation correction>full correction>test print 1.
In a while, the machine prints out Test Print 1.
4) Place the printout (Test Print 1) on the copyboard
glass as indicated on the control panel.
5) Press [read start].
The machine will read the printout of Test Print 1.
When a message has appeared asking you to remove
the printout, remove it from the copyboard glass.
6) Press [test print 2].
In a while, the machine prints out Test Print 2.
7) Place the printout of Test Print 2 on the copyboard
glass as indicated on the control panel.
8) Press [read start].
The machine will read Test print 2.
When a message has appeared asking you to remove
the printout, remove it from the copyboard glass.
9) Press [test print 3].
In a while, the machine prints out Test Print 3.
10) Place the printout of Test Print 3 on the copyboard
as indicated on the control panel.
11) Press [read start].
The machine will read Test Print 3.
When a message has appeared asking you to remove
the printout, remove it from the copyboard.
12) Press the Reset key to end User mode.
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2.2.21 Checking the Image/
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1) Place the Test Chart on the copyboard glass, and
make copies using the cassettes and the deck as the
source of paper; then, check the output images.
be sure there is no abnormal noise.
be sure that
magnifications are all correct.
be sure that as many copies as specified are made.
be sure that the images are all correct regardless of
the source of paper used.
The output must satisfy the following standards:
horizontal registration (margin on image left edge):
2.5 +/ 1.5 mm
leading edge (margin on image leading edge): 4 +1.5,
1.0 mm
If the output is not as indicated, see the instructions on
how to adjust the horizontal registration and leading
edge registration.
2.2.22 Adjusting the
Adjust the horizontal registration as follows according
to the source of paper:
Cassette 3
1) Press the cassette release button, and slide out the
cassette 3 to the front.
2) Open the upper right cover and the lower right
cover.
3) Insert a screwdriver through the hole in the front
right stay; then, loosen the screw [1] to adjust the
position of the adjusting plate [2].
Operation
images
Horizontal Registration
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produced at different
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