Brother HL-7050N - Manual (Page 143)

4 - 16 OPTIONS
HL7050_US_UG_FM5.5
6 Press the DIMM straight into the slot (press firmly). Make sure
the locks on each side of the DIMM click into place. (To remove
a DIMM, you must release the locks.)
Figure 4-13
7 Secure the metal plate with the three screws.
Figure 4-14
8 Put the side cover back on.
9 Reconnect the interface cable to your printer.
Plug the printer back in, and then turn on the printer power
switch.
10 To check whether the DIMM has been installed properly, you
can print the Print Settings listing that shows the current
memory size. To print the Print Settings listing, see Chapter 3.