Dell OptiPlex 9020 (Mid 2013) - Manual (Page 8)

6. drive cage
7. optical drive
8. power switch
9. input/output (I/O) Panel
1. memory module
2. speaker
3. front bezel
4. system fan
Removing the Cover
1. Follow the procedures in Before Working Inside Your Computer .
2. Pull-up the cover-release latch and lift the cover. Lift the cover upward to a 45–degree angle and remove it from the
computer.
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