Canon iP4700 SERIES On-Screen Manual page 376

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Advanced Guide Troubleshooting
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
printer.
Cleaning Inside the Printer
Note
When performing borderless printing, duplex printing, or too much printing, the inside may
become stained with ink.
> > Back of the Paper Is Smudged
Print Results Not Satisfactory
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