Brother HL-S7000DN - Manual (Page 19)

Printing Methods
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1
c
Put paper in the MP tray and make sure:
 The paper stays under the maximum paper mark (1).
 The side to be printed on must be face up with the leading edge (top of the paper) in first.
d
While pressing the gray paper-guide release lever (1), slide the paper guide to fit the paper size.
1
1