Canon MF229dw User Manual page 43

You can print on the back side of printed paper. Flatten any curls on the printed paper and insert it into the manual feed slot
( Loading Paper in the Manual Feed Slot), with the side to print face up (previously printed side face down).
Load one sheet at a time per each print.
You can use only the paper printed with this machine.
You cannot print on the side that has previously been printed on.
If you are using A5 paper, the reverse side may not be printed correctly.
LINKS
Paper
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