|
Jumpers, Switches, and Connectors: Dell PowerEdge 1400 Systems Service Manual
Back to Contents Page
Jumpers, Switches, and Connectors: Dell™ PowerEdge™ 1400
Systems Service Manual
This section provides specific information about the jumpers on the
system board. It also provides some basic information on jumpers and switches and
describes the connectors and sockets on the various boards in the computer.
Jumpers and switches provide a convenient and reversible
way of reconfiguring the circuitry on a printed circuit board. When reconfiguring the
system, you may need to change jumper settings on the system board. You may also need to
change jumper and/or switch settings on expansion cards or drives.
Jumpers
Jumpers are small blocks on a circuit board with two or
more pins emerging from them. Plastic plugs containing a wire fit down over the pins. The
wire connects the pins and creates a circuit. To change a jumper setting, pull the plug
off its pin(s) and carefully fit it down onto the pin(s) indicated.
NOTICE: Make sure the system is turned off before you change
a jumper setting. Otherwise, damage to the system or unpredictable results may occur.
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. The jumper setting is often
shown in text as two numbers, such as 1-2. The number 1 is printed on the circuit board so
that you can identify each pin number based on the location of pin 1.
Switches
Switches control various circuits or functions in the
computer system. While the system board does not have switches, PCI
expansion boards installed in your system may have switches. The switches that 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).
 |
1 |
Rocker switch |
2 |
Slide switch |
|
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 screwdriver 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.
Figure 1 shows the location of the components on the system
board. The connector or socket labels are given in parentheses and upper case, for
example: (FANS).
Figure 1. System Board
Components
Figure 2 shows the
location of the configuration jumpers on the system board. Table 1 lists the function of
these jumpers.
Figure 2. System Board
Jumpers
Back to Contents Page
| 
jumpered
unjumpered