Brother HL-7050N - Manual (Page 137)

4 - 10 OPTIONS
HL7050_US_UG_FM5.5
5 Put the network board connector firmly into the connector of the
main controller board, and then secure it with the two screws.
Figure 4-7
6 Secure the metal plate with the three screws.
Figure 4-8
7 Close the side cover.
8 Connect one end of the Ethernet Cable to the Network port of
the printer.
9 Plug the printer back in, and then turn on the power switch.
10 For details about how to use the Network board, please see the
Network User's Guide on the CD-ROM that we have supplied
with this printer.