Dell PowerVault 735N (Rackmount NAS Appliance) - Manual (Page 72)

Jumpers, Switches, and Connectors: Dell Powervault 735N Systems Service Manual
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Jumpers, Switches, and Connectors: Dell™ PowerVault™ 735N
Systems Service Manual
Overview SCSI Backplane Boards
Jumpers and Switches—A General Explanation Interposer Board Connectors
System Board Jumpers Disabling a Forgotten Password
System Board Labels
Overview
This section provides specific information about the jumpers on the system board. It also provides some
basic information on jumpers and switches and describes the connectors and sockets on the various boards
in the computer.
Jumpers and Switches—A General Explanation
Jumpers and switches 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 and/or switch 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.
NOTICE: Make sure 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.