Dell Inspiron 11z (1120, Mid 2010) - Manual (Page 8)

4. Press and eject any installed cards from the 7-in-1 Media Card Reader.
5. Disconnect your computer and all attached devices from their electrical outlets.
6. Disconnect all attached devices from your computer.
7. Remove the battery (see Removing the Battery ).
8. Turn the computer top-side up, open the computer, and press the power button to ground the system board.
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CAUTION: To help prevent damage to the system board, remove the main battery (see Removing the Battery ) before working inside the
computer.