Dell T3400 manual Removing the Computer Cover, 145

3Disconnect all telephone or network cables from the computer.

NOTICE: To avoid damaging the system board, you must remove the main battery before you service the computer.

4Disconnect your computer and all attached devices from their electrical outlets.

5Press the power button to ground the system board.

CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the display.

NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the computer. While you work, periodically touch an unpainted metal surface to dissipate static electricity, which could harm internal components.

Removing the Computer Cover

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before removing the cover.

1Follow the procedures in "Before You Begin" on page 143.

NOTE: Ensure that sufficient space exists to support the removed cover.

2Remove the security cable from the security cable slot (if installed).

3Lay your computer on its side with the computer cover facing up.

4Pull back on the cover release latch.

5With the cover release latch pulled back, lift the top of the cover up and away from the computer.

6Slide the cover forward to remove it from the hinge slots, then set the cover aside in a secure and protected location.

Adding and Replacing Parts

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