Canon Laser Class 700 Series Reference Manual page 174

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6-12 Periodic Cleaning
CF-PL Reference Guide_USEN HT1-2187-000-V.1.0
Using a dry, lint-free cloth, wipe any dust off the black plate of
the transfer guide.
Transfer Guide
While holding the green label, flip the transfer guide up to its
full extent. Wipe the edge of the transfer guide with a soft,
clean cloth, to remove toner and paper dust from both sides of
the transfer guide.
Green Label
Transfer Guide