Dell XPS M140, Service Manual

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Before You Begin
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Before You Begin
Preparing to Work Inside the Computer
CAUTION:
Before you perform any of the procedures in this section, follow the safety instructions in the
Product Information Guide
.
NOTICE:
Only a certified service technician should perform repairs on your computer. Damage due to
servicing that is not authorized by Dell is not covered by your warranty.
NOTICE:
To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically
touching an unpainted metal surface (such as the back panel) on the computer.
NOTICE:
Handle components and cards with care. Do not touch the components or contacts on a card.
Instead, hold a card by its edges or by its metal mounting bracket. Hold a component such as a
microprocessor by its edges, not by its pins.
NOTICE:
When disconnecting a cable, pull on the cable’s connector or on its strain-relief loop, not on the
cable itself. Some cables have connectors with locking tabs; before disconnecting this type of cable, press
inward on the locking tabs to release the connector. When connecting or disconnecting a cable, ensure that
the connectors are correctly oriented and aligned to avoid damage to the connector and/or the connector’s
pins.
NOTICE:
To avoid damaging the computer, always perform the following steps before you begin working
inside the computer.
1 Ensure that the work surface is flat and clean to prevent scratching the computer cover.
2 Save any work in progress and exit all open programs.
3
Turn off the computer and all attached devices.
NOTE:
Ensure that the computer is off and not in a power management mode. If you cannot shut down
the computer using the operating system, press and hold the power button for 4 seconds.
4 Disconnect the computer from the electrical outlet.
NOTICE:
To avoid damaging the system board, wait 10 to 20 seconds before disconnecting any attached
devices.
5 Disconnect all attached devices.
6 Disconnect all external cables from the computer.
7 Close the display and turn the computer upside down on a flat work surface.
NOTICE:
To avoid damaging the system board, you must remove the main battery before servicing the
computer.