Epson LQ-500 User Manual page 108

The interface Boards
4. Secure the board with the three screws provided.
5. For all interface boards except the #8143 new serial interface
board, set the DIP switches the interface board according to
on
the manual accompanying your interface board. (If you have the
#8143 board, see page A-12.)
6. Reattach the upper case as described in the following section.
Appendix A-9