If the back side of the paper is dirty, clean the platen inside the front cover.
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Do not touch the metal shaft or encoder sheet behind the platen.
Clean the platen at least once a month.
Platen
Metal shaft
Encoder sheet
Open the front cover.
Wipe the platen with a damp and tightly wrung cloth.
Close the front cover.
After cleaning the platen, make sure the platen dries, and then turn on the main power.