Canon imageRUNNER ADVANCE 4551i III Guía De Preguntas Frecuentes página 23

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Solution
Make sure that the original size and
output paper size are correct.
1.
Check the original size and possible output
sizes on the [Printing Preferences] screen of the
printer driver.
2.
Load paper of the size matching the original size
setting.
P O I N T
To print on paper of a size different from that
of the original, manually specify the paper size
to print on with [Output Size].
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