Canon LASER SHOT LBP3500 User Manual page 127

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2-84 2-sided Printing
From [Output Size], select the size of the loaded paper as
needed.
Leave the setting at [Match Page Size] when the page size and the size of the
paper loaded in the multi-purpose tray are the same, since there is no need to
change the setting.
IMPORTANT
The print will be automatically reduced or enlarged to fit on the page when the
settings for [Page Size] and [Output Size] are different.
Display the [Paper Source] sheet and set [Paper Source] to
[Multi-purpose Tray].