Acer Altos R520 M2 Series User Manual page 68

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To remove an optical drive:
1 Perform the pre-installation instructions described on page 35.
2 Remove the front bezel. Perform the instructions described in "To
remove the front bezel" section on page 37.
3 Remove the access panel.
(1) Remove the four screws that secure the access panel to the
chassis.
(2) Slide the access panel to disengage from the chassis, then lift
the access panel off the chassis.
(3) Put the access panel aside for reinstallation later.
3 System upgrade