Brother MFC-8420 User Manual page 412

2
Remove the side cover. Loosen the two screws, and then
remove the metal shield plate.
3
Unpack the DIMM and hold it by the edges.
WARNING
DIMM boards can be damaged by even a small amount of static
electricity. Do not touch the memory chips or the board surface.
Wear an antistatic wrist strap when you install or remove the board.
If you do not have an antistatic wrist strap, frequently touch the bare
metal on the printer.
4
Hold the DIMM with your fingers on the side edges and your
thumb on the back edge. Line up the notches on the DIMM with
the DIMM slot. (Check that the locks on each side of the DIMM
slot are open or facing outwards.)
OPTIONAL ACCESSORIES 23 - 3