Canon Satera LBP3900 User Manual page 21

IMPORTANT
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When changing the size of the paper to be loaded, adjust the
length of the paper cassette and change the positions of the
paper guides.
● When loading paper in Cassette 1, adjust the length of the paper
cassette according to the paper to be loaded.
When loading paper at sizes of A4, B5, A5, Letter, and Executive, shorten the
paper cassette.
When loading paper at sizes of A3, B4, A4R, Ledger (11 x 17), Legal, and
LetterR, extend the paper cassette.
To adjust the length of the paper cassette, align the lock release lever with "
to release the lock, slide the paper cassette by holding the rear portion of the
paper cassette, and then align the lock release lever with "
cassette.
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CAUTION
Be sure to take the paper cassette out of the printer before loading paper.
If paper is loaded while the paper cassette is partially pulled out, the paper
cassette may drop or the printer may become damaged resulting in
personal injury.
The paper cassette cannot be pulled out horizontally. If you try to pull it out
forcefully, this may result in damage to the paper cassette.
Hold the paper cassette with both hands securely because the cassette is heavy.
Place the removed paper cassette on a flat and stable surface.
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" to lock the