Jumpers and connectors, Overview, Jumpers — a general explanation – Dell PowerEdge 500SC User Manual
Page 14: System board jumpers, Jumpers
Back to Contents Page
Jumpers and Connectors
Dell™ PowerEdge™ 500SC Systems Service Manual
Overview
This section provides specific information about the jumpers on the system board. It also provides some basic information on jumpers and describes the
connectors and sockets on the various boards in the system.
Jumpers — A General Explanation
Jumpers provide a convenient and reversible way of reconfiguring the circuitry on a printed circuit board. When installing replacement parts or reconfiguring
the system, you may need to change jumper settings on the system board. You may also need to change jumper 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.
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.
System Board Jumpers
Figure 1 shows the location of the configuration jumpers on the system board.
lists the function of these jumpers.
Figure 1. System Board Jumpers
Table 1. System-Board Jumper Settings
Disabling a Forgotten Password
NOTICE:
Make sure the system is turned off before you change a jumper setting. Otherwise, damage to the system or unpredictable results may occur.
Jumper
Setting
Description
PASSWORD
(default)
The password feature is enabled.
The password feature is disabled.
NVRAM
(default)
The configuration settings are retained at system boot.
The configuration settings are cleared at next system boot. If the
configuration settings become corrupted to the point where the
system will not boot, install the jumper plug and boot the
system. Remove the jumper before restoring the configuration
information.
jumpered
unjumpered