8R1U-01U
The definition of the printout is low
The dither pattern settings are not appropriate for the image being printed. Adjust the dither pattern settings.
Remedy
To improve this situation, change the dither pattern settings.
Press 
→ <Adjustment/Maintenance> → <Adjust Image Quality> → <Dither Settings> → decrease the setting value for <Gradation> and <Resolution>.
→ <Adjustment/Maintenance> → <Adjust Image Quality> → <Dither Settings> → decrease the setting value for <Gradation> and <Resolution>.
"Adjusting Print and Finish Quality"> "Setting the Dither Pattern" in the User's Guide