Switches - Dell OptiPlex GXi Reference And Installation Manual

A jumper is referred to as open or unjumpered when the
plug is pushed down over only one pin or if there is no
plug at all. When the plug is pushed down over two pins,
the jumper is referred to as jumpered. In some docu-
ments, the jumper setting may be shown in text as two
numbers, such as 1-2. The number 1 is printed on the cir-
cuit board so that you can identify each pin number based
on the location of pin 1.
Figure 5-7 shows the location and default settings of the
jumper blocks on your system board. See Table 5-1 for
the designations, default settings, and functions of your
system's jumpers.

Switches

Switches control various circuits or functions in your
computer system. The switches you are most likely to
encounter are dual in-line package (DIP) switches, which
are normally packaged in groups of two or more switches
in a plastic case. Two common types of DIP switches are
slide switches and rocker switches (see the following
illustration).
slide switches
Each of these switches has two positions, or settings
(usually on and off). To change the setting of a slide
switch, use a small, pointed object such as a small screw-
driver or a straightened paper clip to slide the switch to
the proper position. To change the setting of a rocker
switch, use the screwdriver or paper clip to press down
on the appropriate side of the switch. In either case, do
not use a pen, pencil, or other object that might leave a
residue on the switch.
Working Inside Your Computer
rocker switches
5-5