Jumpers And Connectors; System Board Jumpers - Dell PowerVault 775N Installation And Troubleshooting Manual

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Jumpers and Connectors

Dell™ PowerVault™ 775N Systems Installation and Troubleshooting Guide
Jumpers—A General Explanation

System Board Jumpers

System Board Connectors
Expansion-Card Riser-Board Components and PCI Buses
SCSI Backplane 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. Example 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.
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
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.
Figure A-2. System Board Jumpers
Figure A-1 shows an example of a jumper.
Table A-1 for the designations, default
Table A-1 lists the jumpers settings.