Canon C850 Practical Manual page 142

When Your Printouts Look Like���
Uneven glossiness that is perpendicular to
the direction of feed occurs�
On the first sheet, there is a color difference
in an area reaching 174 mm (6 7/8") from the
leading edge caused by uneven glossiness�
174 mm (6 7/8")
Color difference
← Feeding Direction
On the second and following sheets, there
is a bar of uneven glossiness within an area
reaching 174 mm (6 7/8") from the leading
edge�
174 mm (6 7/8")
Bar of uneven glossiness
← Feeding Direction
140 140
imagePRESS C850/C750/C650/C65
Check the Cause and Remedy Below
Cause
Temperature for fixing toner does not match the specific
characteristics of the paper�
Remedy
To improve this situation, adjust the value for <Adjust
Gloss/Fine Black> to match the specific characteristics of
the paper�
→ [Preferences] → [Paper Settings] → [Paper
Press
Type Management Settings] → select the type of paper
you are using that is having this problem → press
[Details/Edit] → [Change] for <Adjust Gloss/Fine Black>
→ adjust the value for [Gloss] toward the minus end if
the area is too glossy or toward the plus end if it is not
glossy enough�
"Paper Type Management" > "Adjusting the Gloss
and Fine Black" in the User's Guide