Clean the Original Scanning Area Screen Prompt
You can set the machine to display the message that prompts you to clean the scanning area when the machine detects streaks or stains. If the feeder is not clean, the machine will scan and print dust and grime on the output. The Clean the Original Scanning Area Prompt appears when originals are placed in the feeder. For instructions on cleaning the feeder's scanning area, see "Originals Loaded in the Feeder and Prints Become Dirty (Manual Feeder Cleaning)."
1.
Press 
(Settings/Registration).
(Settings/Registration).2.
Press [Preferences] → [Display Settings] → [Notify to Clean Original Scanning Area].
3.
Press [On] → [OK].
If you do not want to set the machine to display the message that prompts you to clean the scanning area, press [Off].