Epson EPL-N1200 User Manual page 86

Then insert the SIMM at an angle and rotate the top until it
is vertical and clicks into place. (Do not push too hard.)
6. Follow the steps on pages 4-7 to 4-8 to reinstall the controller
board in the printer.
If you ever need to remove a SIMM, pull back the metal clips
on each side of the slot; then grasp the SIMM and pull it out.
To verify that the SIMM is working properly, print a status
sheet and make sure the correct memory amount is listed
under "Hardware Configurations." To do this, wait until the
printer warms up (Ready appears on the control panel display
and the On Line light is on); then press the Enter button twice.
Installing Options
4-15