Canon MG5100 series On-Screen Manual page 845

Advanced Guide >
Troubleshooting
U318
Back of the Paper Is Smudged
Check 1: Did you confirm the paper and print quality settings?
Print Results Not Satisfactory
Check 2: Perform the Bottom Plate Cleaning to clean the inside of the
machine.
Cleaning the Inside of the Machine (Bottom Plate Cleaning)
Note
When performing borderless printing, duplex printing, or too much printing, the inside may
become stained with ink.
> Print Results Not Satisfactory > Back of the Paper Is Smudged
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