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 "Manual Feeder Cleaning."
If you are using the imageRUNNER ADVANCE 4235/4225, this mode can be set when the DADF-AG1 is attached. (See "DADF-AG1.")
1.
Press 
(Settings/Registration).
(Settings/Registration).2.
Press [Preferences] → [Display Settings] → [Display Original Scanning Cleaning 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].