Printing quality deteriorates if the Print Head Glass is dirty. If this occurs, clean the Print Head Glass according to the following procedure.
Open the Lower Front Door or Front Door of the machine.
Release the Waste Toner Box Lock Lever, then remove the Waste Toner Box.
Remove the Printhead Cleaner from the Lower Front Door or Front Door of this machine.
Slowly insert the Printhead Cleaner all the way to the back end of the Print Head Glass, and then slowly pull it out.
Repeat this operation approximately three times for all the Print Head Glass sections.
Mount the Printhead Cleaner onto the Lower Front Door or Front Door of this machine.
Install the Waste Toner Box.
Close the Lower Front Door or Front Door of the machine.