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W
hen Working Inside the
Computer
Before taking the covers off of the computer, perform the
following steps in the sequence indicated:
1. Turn off the computer and any peripherals.
2. Disconnect the computer and peripherals from
their power sources. Also, disconnect any tele-
phone or telecommunications lines from the
computer.
Doing so reduces the potential for personal injury or
shock.
3. Touch an unpainted metal surface on the com-
puter chassis, such as the power supply, before
touching anything inside the computer.
While you work, periodically touch an unpainted
metal surface on the computer chassis to dissipate
any static electricity that might harm internal
components.
In addition, take note of these safety guidelines when
appropriate:
•
To help avoid possible damage to the system board,
wait 5 seconds after turning off the system before
removing a component from the system board or dis-
connecting a peripheral device from the computer.
•
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. Don’t 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.
P
rotecting Against Electrostatic
Discharge
Static electricity can harm delicate components inside the
computer. To prevent static damage, discharge static elec-
tricity from your body before you touch any of the
computer’s electronic components, such as the micro-
processor. You can do so by touching an unpainted metal
surface on the computer chassis.
As you continue to work inside the computer, periodi-
cally 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’s
antistatic packing material until you are ready to
install the component in the computer. Just before
unwrapping the antistatic packaging, be sure to dis-
charge 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 caution may appear throughout this docu-
ment to remind you of these precautions:
WAR NI NG
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.
CAUTION: See “Protecting Against Electrostatic
Discharge” in the safety instructions at the front of
this guide.