Xerox 820-II Word Processing Applications And Reference Manual page 266

Now you're ready to install the "jumpers" (shown in the first illustration below) on the pins
on the 820-II's board (as shown in the second illustration below). The pins on the board are
sharp, so take
CAUTION
to to prick your fingers on them.
LOCATE the three small, black "jumpers" that came in the printer kit.
LOCATE the pins that stick up near the back of the 820-11, as shown in the
illustration below.
WARNING: Computer components and comectors are delicate. Care
should
be
taken not
to
bend
or damage these parts.
SYSTEM COMPONENTS
14-48