Epson EPL-N3000 Reference Manual page 231

1. Turn the printer off and unplug the power cord and interface
cable.
2. Remove the screws and the Type B interface card slot cover
as shown below.
w
Note:
Keep the slot cover in a safe place. You will need to reattach it if you
remove the interface card later.
218
Installing Options
Warning:
Removing screws and covers that are not described in the
following instructions will expose high voltage areas.