Brother HL-7050N - Manual (Page 131)

4 - 4 OPTIONS
HL7050_US_UG_FM5.5
Duplex unit (DX-7000)
The Duplex unit is an optional device that allows you to print on both
sides of a piece of paper. When it is installed, you can select either
duplex printing or simplex printing on the control panel or with a
software command. For more information about the control panel,
see PAPER menu in Chapter 3.
To install the duplex unit, please see the User's Guide that we have
supplied with the Duplex unit.
Figure 4-2
Guidelines for printing on both sides of the paper
■ If the paper is thin, it may wrinkle.
■ If paper is curled, straighten it, and then place it in the paper
tray.
■ If the paper is not feeding correctly, it may be curled.
Remove the paper and straighten it.