Before you open the computer cover, perform the following steps in the sequence
indicated.
NOTICE: Do not attempt to service
the computer yourself, except as explained in your online Dell documentation or otherwise
provided to you. 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.
Perform an orderly computer shutdown using the operating
system menu.
Turn off your computer and any devices.
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.
Disconnect your computer and devices from their power
sources. 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:
When you disconnect a cable, pull on its connector or on its strain-relief loop, not on
the cable itself. Some cables have a connector with locking tabs; if you are disconnecting
this type of cable, press in on the locking tabs before disconnecting the cable. As you
pull connectors apart, keep them evenly aligned to avoid bending any connector pins. Also,
before you connect a cable, make sure both connectors are correctly oriented and aligned.
Handle components and cards with care. Do not touch the components or contacts on a
card. Hold a card by its edges or by its metal mounting bracket. Hold a component such as
a microprocessor chip by its edges, not by its pins.
CAUTION: There is a danger of
a new battery exploding if it is incorrectly installed. Replace the battery only with the
same or equivalent type recommended by the manufacturer. Discard used batteries according
to the manufacturer's instructions.
Static electricity can harm delicate components inside your computer. To prevent static
damage, discharge static electricity from your body before you touch any of your
computer's electronic components, such as the microprocessor. You can do so by touching an
unpainted metal surface on the computer chassis.
As you continue to work inside the computer, periodically touch an unpainted metal
surface to remove any static charge your body may have accumulated.
You can also take the following steps to prevent damage from electrostatic discharge
(ESD):
When unpacking a static-sensitive component from its shipping carton, do not remove the
component from the antistatic packing material until you are ready to install the
component in your computer. Just before unwrapping the antistatic packaging, be sure to
discharge static electricity from your body.
When transporting a sensitive component, first place it in an antistatic container or
packaging.
Handle all sensitive components in a static-safe area. If possible, use antistatic floor
pads and workbench pads.
The following notice may appear throughout this document to remind you of these
precautions:
NOTICE: See "Protecting
Against Electrostatic Discharge" in the safety instructions at the front of this
guide.
CAUTION: Improper or prolonged
keyboard use may result in injury.
CAUTION: Viewing the monitor
screen for extended periods of time may result in eye strain.
For comfort and efficiency, observe the following ergonomic guidelines when setting up
and using your computer:
Position your computer so that the monitor and keyboard are directly in front of you as
you work. Special shelves are available (from Dell and other sources) to help you
correctly position your keyboard.
Set the monitor at a comfortable viewing distance (usually 510 to 610 millimeters [20 to
24 inches] from your eyes).
Make sure the monitor screen is at eye level or slightly lower when you are sitting in
front of the monitor.
Adjust the tilt of the monitor, its contrast and brightness settings, and the lighting
around you (such as overhead lights, desk lamps, and the curtains or blinds on nearby
windows) to minimize reflections and glare on the monitor screen.
Use a chair that provides good lower back support.
Keep your forearms horizontal with your wrists in a neutral, comfortable position while
using the keyboard or mouse.
Always leave space to rest your hands while using the keyboard or mouse.
Let your upper arms hang naturally at your sides.
Sit erect, with your feet resting on the floor and your thighs level.
When sitting, make sure the weight of your legs is on your feet and not on the front of
your chair seat. Adjust your chair's height or use a footrest, if necessary, to maintain
proper posture.
Vary your work activities. Try to organize your work so that you do not have to type for
extended periods of time. When you stop typing, try to do things that use both hands.
1
Monitor screen at or below eye level
4
Arms at desk level
2
Monitor and keyboard positioned directly in front of the
user
