Dell PowerVault 715N (Rackmount NAS Appliance) - Manual (Page 33)

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Jumpers, Switches, and Connectors
Dell™ PowerVault™ 715N Systems Service Manual
Overview System Board Jumpers
Jumpers — A General Explanation System Board Features
Overview
This section provides specific information about the jumpers on the system board. It also provides some basic information
about jumpers and describes the connectors and sockets 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 installing
replacement parts or reconfiguring the system, you might need to change jumper settings on the system board. You
might 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 (see Figure 1 ). 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 1. Jumpers
NOTICE: Make sure the system is turned off before you change a jumper setting. Otherwise, damage to the
system or unpredictable results might 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.
Switches
Switches control various circuits or functions in the system. The switches that you are most likely to encounter are dual
in-line-package (DIP) switches, which are normally packaged in groups of two or more switches in a plastic case. Two
common types of DIP switches are slide switches and rocker switches (see Figure 2 ). The setting of the rocker type DIP
switches at SW3 on the system board are not to be changed from their open or off setting (see Figure 4)
NOTICE: All DIP switch (SW3) positions must remain in the OFF position. Do not change these DIP switch settings.
Figure 2. Switches
1 Rocker switch
2 Slide switch