Dell 3 - Manual (Page 5)

3
NOTE: The voltage
selection switch must be
set to the 115-V position
even though the AC power
available in Japan is
100 V.
• 100 V/50 Hz in eastern Japan and 100 V/60 Hz in western Japan
• 230 V/50 Hz in some regions in the Caribbean and South America and
most of Europe, the Middle East, and the Far East
Also, ensure that your monitor and attached devices are electrically rated to
operate with the AC power available in your location.
• Before working inside the computer, unplug the computer to help
prevent electric shock or system board damage. Certain system board
components continue to receive power any time the computer is
connected to AC power.
When Working Inside Your Computer
Before you open the computer cover, perform the following steps in the
sequence indicated.
CAUTION: Do not attempt to service the computer yourself,
except as explained in your online Dell™ documentation or in
instructions otherwise provided to you by Dell. Always follow
installation and service instructions closely.
NOTICE: To help avoid possible damage to the system board, wait 5 seconds
after turning off the computer before removing a component from the system
board or disconnecting a device from the computer.
1 Perform an orderly computer shutdown using the operating system
menu.
2 Turn off your computer and any devices connected to the computer.
3 Ground yourself by touching an unpainted metal surface on the
chassis, such as the metal around the card-slot openings at the back of
the computer, before touching anything inside your computer.
While you work, periodically touch an unpainted metal surface on the
computer chassis to dissipate any static electricity that might harm
internal components.
4 Disconnect your computer and devices, including the monitor, from
their electrical outlets. Also, disconnect any telephone or
telecommunication lines from the computer.
Doing so reduces the potential for personal injury or shock.
In addition, take note of these safety guidelines when appropriate: