User`s manual

If the FG wire is not attached, follow these steps:
1.
Set the DIP switches on the interface board according to the
manual accompanying your interface board. (If you are
installing the #8143 board, see the next section, #8143 New Serial
Interface.)
2.
Use the CG screw to attach the round end of the FG wire to the
main board and position the other end as shown.
5-56 Using the Printer Options