Lenovo ThinkCentre M57e - Manual (Page 17)

Voltage-selection switch
Some computers are equipped with a voltage-selection switch located near the
power-cord connection point on the computer and some computers do not
have a voltage-selection switch. Before you install your computer or relocate
your computer to another country or region, you must be certain that you
have matched your computer to the voltage available at your electrical outlet.
CAUTION:
You must know the voltage of the electrical connection (outlet) where your
computer will be connected. If you do not know the voltage, contact your
local electric company or refer to official Web sites or other literature for
travelers to the country or region where you are located.
If your computer has a voltage-selection switch, you must set the switch to
match the voltage available at your electrical outlet. Setting the
voltage-selection switch incorrectly will cause the computer to malfunction and
might cause permanent damage to the computer. Do not connect the computer
to an electrical outlet until you have verified that the voltage-selection switch
setting matches the voltage available at the electrical outlets.
If your computer does not have a voltage-selection switch, inspect the
voltage-rating label on the bottom of the computer and note the following:
v If the voltage-rating label shows a range of either ″100-127 V ″ or ″200-240 V, ″
you must ensure that the voltage provided at the electrical outlet matches
the voltage rating on the computer label. If it does not match, do not
attempt to connect the computer to the electrical outlet, unless an external
device such as a voltage-converting transformer is used.
v If the voltage-rating label shows a dual range of ″100-127 V ″ and ″200-240
V, ″ this signifies that the computer is suitable for worldwide operation and
the computer will automatically adjust to the voltage at the electrical outlet
regardless of the country or region where the computer is being connected.
Extension cords and related devices
Ensure that extension cords, surge protectors, uninterruptible power supplies,
and power strips that you use are rated to handle the electrical requirements of
the product. Never overload these devices. If power strips are used, the load
should not exceed the power strip input rating. Consult an electrician for more
information if you have questions about power loads, power requirements, and
input ratings.
Plugs and outlets
If a receptacle (power outlet) that you intend to use with your computer
equipment appears to be damaged or corroded, do not use the outlet until it is
replaced by a qualified electrician.
Chapter 1. Important safety information
13