Dell Precision Workstation 690 User Manual page 122

6. Locate the three hinge tabs on the edge of the computer.
7. Grip the sides of the computer cover and pivot the cover up, using the hinges as leverage points.
8. Release the cover from the hinge tabs and set it aside in a secure location.
NOTICE: The computer cooling system cannot function properly while the computer cover is not installed. Do not attempt to boot the computer before
reinstalling the computer cover.
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