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Chapter 5, Upgrading Your Computer
Page 42
Precautions to Follow Before Upgrading
Observe the following precautions when you perform any upgrades on your
computer.
Avoiding Electronic Injuries
To avoid receiving any electrical shocks when you upgrade your computer, you
should take the following precautions in advance:
• Turn off the computer and any attached peripherals.
• Disconnect the computer and any attached peripherals from their power
sources.
• Disconnect any telephone or telecommunications lines from the computer.
• Wear a wrist grounding strap and clip it to an unpainted metal surface, such as
the security cable ring on the back of the chassis. If a wrist grounding strap is
not available, touch an unpainted metal surface on the back of the computer to
discharge any static charge from your body.
When you finish the upgrade, always make sure all other system cables are
connected before connecting the computer to its power source.
Antistatic Grounding
Your computer contains many sensitive components that are prone to damage from
static electricity. A static-electric charge is present in your body. In addition, your
body can pick up static electricity especially in carpeted rooms and/or in dry
weather.
When your body touches an object with an opposite charge, the static electricity is
discharged and you feel a “shock.” This shock can severely damage your
computer’s components. Even a mild static shock can damage the sensitive
electronics of your computer. Therefore, before you touch the inside of your
computer, touch a metal part on the outside of the computer several times to
remove the static-electric charge from your body. Also avoid touching any
exposed integrated circuitry or connectors inside your computer or inside the
individual components installed in your computer.
To further reduce the chance of danger from static electricity, wear a grounding
strap around your wrist. (See the preceding section.)