Epson LQ-670 User Manual page 112

2. Remove the screws securing the shield plate to the back of the
printer and remove the plate.
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 card is fully inserted into the
printer's internal socket. Then reinsert 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.
To remove the interface card, reverse the steps above.
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Using Printer Options