Back Of The Paper Is Smudged - Canon MB5000 Series Online Manual

Back of the Paper Is Smudged

Did you confirm the paper and print quality settings?
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Print Results Not Satisfactory
Perform the Bottom Plate Cleaning to clean the inside of the machine.
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Cleaning the Inside of the Machine (Bottom Plate Cleaning)
Note
• When performing duplex printing or too much printing, the inside may become stained with ink.
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