Epson 24-Pin User Manual page 190

3. Slide the interface card along the slots on both sides of the
interface compartment. Firmly push in the card to make sure
the connector at the back of the interface card is fully inserted
into the printer's internal socket. Then replace the screws and
tighten them.
Note:
Store the shield plate in a safe place; you will need to reattach it if
you remove the interface card later.
To remove the interface card, perform the procedure above in
reverse order.
A-30
Enhancing Your Printer With Options