Brother MFC-J3540DW Online User's Manual page 43

4. Gently press and slide the paper width guides (1) and then the paper length guide (2) to fit the paper size.
Make sure the triangular mark (3) on the paper width guide (1) and paper length guide (2) line up with the
marks for the paper you are using.
1
3
3
2
5. Fan the stack of paper well to avoid paper jams and misfeeds.
Always make sure the paper is not curled or wrinkled.
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