Epson EPL-8000 User Manual page 225

Now slide the controller board into the printer. The
3.
lever pivots outward. Firmly press up on the lever to lock the
board into place.
If the controller board does not fit smoothly into the printer,
do not force it. Remove it and make sure the edges fit properly
into the grooves in the slot.
Gently press in on the board to make sure it is fully seated.
4.
Then secure the board with the four screws you removed
previously.
Replace the optional interface card, if you removed one.
5.
Connect any interface cables you removed.
6
Be sure the power is turned off and then plug the power cord
7.
into the printer and into an electrical outlet.
Memory Options
Options 7-35