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Jumpers, Switches, and Connectors
Dell™ PowerEdge™ 1600SC 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
-1
lists the jumpers settings.
Figure A-2. System Board Jumpers
CAUTION:
Ensure that the system is turned off before you change a jumper setting. Otherwise, damage to the system or unpredictable results
may occur.
