Canon MX490 Series Online Manual page 835

When performing duplex printing, the inside of the machine may become stained with ink, causing the printout to
become smudged.
Perform the Bottom Plate Cleaning to clean the inside of the machine.
Cleaning the Inside of the Machine (Bottom Plate Cleaning)
Note
• To prevent the inside of the machine from stains, set the paper size correctly.
Set the time to dry the printed surface longer.
Check10
Doing so gives the printed surface enough time to dry so that paper smudged and scratched are prevented.
1. Make sure that the machine is turned on.
2. Open the printer driver setup window.
How to Open the Printer Driver Setup Window
3. Click the Maintenance tab and then Custom Settings.
4. Drag the Ink Drying Wait Time slide bar to set the wait time, and then click OK.
5. Confirm the message and click OK.
835