Canon Satera LBP-3910 User Manual page 29

● Adjust the paper size register dial (B) to set the dial to the size of the
loaded paper.
IMPORTANT
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28
Cassette 1
(B)
Make sure that the paper size the paper size register dial is indicating corresponds
with the size of the loaded paper before setting the paper cassette in the printer. If
the paper size that the paper size register dial is indicating does not correspond
with the size of the loaded paper, this may result in printer malfunction.
Do not use the "16K" and "8.5 x 13" position.
Cassette 2, 3, and 4
(B)