Brother HL-6050DN - Manual (Page 46)

ABOUT THIS PRINTER 1 - 38
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For the PCL (standard) printer driver
Open the Properties dialog box in the printer driver. Choose the General tab and click the Printing
Preferences icon. Choose the Duplex mode in the Advanced tab, make sure that Use Duplex
Unit has been selected, and then click the OK button. The printer will print on both sides of the paper
automatically.
For the BR-Script printer driver
Open the Properties dialog box in the printer driver. Choose the General tab and click the Printing
Preferences icon. In the Layout tab, select Orientation, Print on Both Sides (Duplex) and Page
Order, and then click the OK button. The printer will print on both sides of the paper automatically.