Epson 24-PIN DOT MATRIX PRINTER LQ-570+ - Manual (Page 98)

3. Be sure to set any switches and jumpers on the card. See the
interface card's manual for details. Make sure that you set
jumper JG to on, or the card will not work properly.
4. Slide the interface card along the slots on both sides of the
interface compartment. Push in firmly to make sure you
fully insert the connector at the rear of the interface card
into the printer's internal socket.
5. Re-insert the screws and tighten to complete installation of
the optional interface.
Removal of the interface card is the reverse of the steps above.
Using Printer Options 4-15