Jumpers and connectors, Jumpers—a general explanation, System-board jumpers – Dell PowerEdge 500SC User Manual

Page 5: Jumpers

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Jumpers and Connectors

Dell™ PowerEdge™ 500SC Systems Installation and Troubleshooting Guide

Jumpers—A General Explanation

System-Board Jumpers

Disabling a Forgotten Password

This section provides specific information about the jumpers on the system board.

Jumpers—A General Explanation

Jumpers 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 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.

Figure A

-1

shows an

example of a jumper.

Figure A-1. Jumpers

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.

Figure A

-2

shows the location and default settings of the jumper blocks on the system board. See

Table A

-1

for the designations, default settings, and

functions of the system's jumpers.

System-Board Jumpers

Figure A

-2

shows the location of the configuration jumpers on the system board.

Table A