Jumpers and connectors, Jumpers—a general explanation, System board jumpers – Dell PowerEdge SC1420 User Manual

Page 2: Jumpers

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Jumpers and Connectors

Dell™ PowerEdge™

SC1420 Systems Installation and Troubleshooting Guide

Jumpers—A General Explanation

System Board Jumpers

System Board Connectors

Disabling a Forgotten Password

This section provides specific information about the system jumpers. It also provides some basic information on jumpers and switches and describes the
connectors 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 reconfiguring the system, you may need to
change jumper settings on circuit boards 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. Example 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 system jumper blocks. 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