Canon LBP-5100 User Manual page 146

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From [Output Size], select the size of the loaded paper as
needed.
Leave the setting at [Match Page Size] when the paper size specified for [Page
Size] and that of the paper loaded in the paper cassette 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.
4
Make sure that the setting in the [Register Paper Size in
Cassettes] dialog box in the Printer Status Window and the
paper size in [Output Size] match when printing from the
paper cassette.
For displaying the [Register Paper Size in Cassettes] dialog box, see "Loading
Paper in the Paper Cassette," on p. 3-17.
Setting Up the Printer Driver and Printing
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