Dell Precision 330 - Manual (Page 56)

56 Installing Upgrades
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Re m o v i n g t h e C o v e r ( M i n i To w e r C h a s s i s )
d Lift the cover away from the chassis.
e Turn the computer on its right side before you begin working
inside the chassis.
If your computer is a desktop chassis, perform the following steps:
a Press the two cover release buttons located on the left and right
sides of the cover (see the following figure).
b Rotate the back of the cover upward, away from the chassis.
cover release button