Canon PIXMA G620 Printer - Manual (Page 285)

Back of Paper Is Smudged
Check1 Check paper and print quality settings.
Printout (Copy) Results Are Unsatisfactory
Check2 Perform bottom plate cleaning to clean inside of printer.
Cleaning Inside the Printer (Bottom Plate Cleaning)
Note
• During borderless printing, duplex printing, or too much printing, ink may stain the inside of the printer. •
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