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CAUTION: Some Dell systems can be serviced only by trained service tech-
nicians because of high voltages and energy hazards. Do not attempt to
service the computer system yourself, except as explained in this guide and
elsewhere in Dell documentation. Always follow installation and service
instructions closely.
NOTICE: To help avoid possible damage to the system board, wait 5 sec-
onds after turning off the system before removing a component from the
system board or disconnecting a peripheral device from the computer.
1. Turn off your computer and any devices.
2. 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.
3. Disconnect
your computer and devices from their power sources. Also, discon-
nect 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 dis-
connecting 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 bend-
ing any connector pins. Also, before you connect a cable, make sure that both
connectors are correctly oriented and aligned.
• Handle components and cards with care. Don’t touch the components or con-
tacts 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 recom-
mended by the manufacturer. Discard used batteries according to the
manufacturer’s instructions.
Protecting Against Electrostatic Discharge
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.