85CR-01Y
Text and images do not print clearly
There is a high probability that condensation may be occurring on the photoconductor drum because the printer is installed in a hot or humid environment. Increase the temperature of the drum.
Remedy
When printing in black and white, increase the temperature of the photoconductor drum.
IMPORTANT
Be sure to contact your local authorized Canon dealer before adjusting the photoconductor drum temperature. Increasing the drum temperature may cause the developer to deteriorate.
Press 
→ [Adjustment/Maintenance] → [Adjust Image Quality] → [Adjust Drum Temperature] → select [High].
→ [Adjustment/Maintenance] → [Adjust Image Quality] → [Adjust Drum Temperature] → select [High].
"Adjusting Print and Finish Quality" > "Adjust Image Quality" > "Adjusting Drum Temperature" in the User's Guide