System Board Jumpers And Switches - Lenovo 3057 Maintenance Manual

21 Backplane power connector 1
22
Backplane power connector 2
Used to connect the power cables from the backplane.
24 26 28 30 System fan connectors
There are four hot-swap system fans and two dummy system fans installed in the system fan cage in your
server. Each system fan connector is used to connect a corresponding hot-swap system fan.
23 Microprocessor socket 2
27 Microprocessor socket 1
If the server has two microprocessors, each of the microprocessor is secured in the microprocessor socket
on the system board and a heat sink is installed above the microprocessor to provide cooling. If the server
has only one microprocessor, the microprocessor socket 2 is protected by a microprocessor socket cover.
25 29 Memory slots
There are 12 memory slots on the system board. For detailed information, see "Memory module installation
rules" on page 97.

System board jumpers and switches

This topic provides information about the jumpers and switches on the system board.
Note: Depending on the model, your server might look slightly different from the illustrations in this topic.
A jumper is a short length of conductor used to set up or adjust a printed circuit board, such as the system
board of a computer. A jumper usually is encased in a non-conductive block of plastic for convenient use
and to avoid any possible damage to a live circuit. Jumper pins arranged in groups on the system board are
called jumper blocks. When two or more jumper pins are capped with a jumper, an electrical connection is
made between them and the equipment is thus instructed to activate certain settings accordingly.
The following illustration shows a jumper in the default setting position (pin 1 and pin 2). This is the correct
position for normal operation.
Figure 39. Default jumper setting
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ThinkServer RD430 Hardware Maintenance Manual