8R0Y-021
When printing on coated paper, uneven glossiness that looks like rain fall appears on the leading edge of the image
The toner cannot fix to the paper because too much water vapor is evaporating from the surface of the paper.
← Feeding Direction
Remedy
Locate the machine in a room that has consistent and suitable temperature and humidity. Keep the paper in the same environment as that where the machine is located. For the appropriate temperature and humidity, see other guides such as the User's Guide.
To improve this situation, adjust the value for <Adjust Gloss> to match the specific characteristics of the paper.
Press 
→ <Preferences> → <Paper Settings> → <Paper Type Management Settings> → select the type of paper you are using that is having this problem → press <Details/Edit> → <Change> for <Adjust Gloss> → adjust the value for Gloss toward the minus end.
→ <Preferences> → <Paper Settings> → <Paper Type Management Settings> → select the type of paper you are using that is having this problem → press <Details/Edit> → <Change> for <Adjust Gloss> → adjust the value for Gloss toward the minus end.
"Managing the Machine" > "Paper Type Management Settings" in the User's Guide > see the subsection "Adjust Gloss"