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Safety Instructions
U
se the following safety guidelines to help protect
your computer system from potential damage and to
ensure your own personal safety.
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 five 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.
Protecting Against Electrostatic
Discharge
Static electricity can harm delicate components inside the
computer. To prevent static damage, discharge static
electricity from your body before you touch any of the
computer’s electronic components, such as the
WARNING: The power supplies in this computer
system produce high voltages and energy hazards,
which can cause bodily harm. Only trained service
technicians are authorized to remove the computer
covers and access any of the components inside the
computer.
WARNING: Before a trained service technician
accesses the inside of the computer, any and all
power supplies must be disconnected from their
power source, and the cables to the power supplies
must also be disconnected. If this computer has
more than one power supply, disconnect both
power supply cords before servicing to avoid
electrical shock.