Lenovo C3 Series User Manual page 49

3. Disconnect all cables attached to the computer. This includes power cords,
input/output (I/O) cables, and any other cables that are connected to the
computer. Refer to "Left and right views" and "Rear view" for help with locating
the various connectors.
4. Remove the stand base. Refer to "Removing the stand base".
5. Remove the foot cover. Refer to "Removing the foot cover".
6. Push out the latches on both sides of the memory socket to release the
memory module and gently pull the memory module upward to remove it
from its socket. All of the memory modules can be removed using the same
procedure.
7. To install a memory module:
Align the new memory module with the memory socket, then insert it and push
down on the top edge. Make sure the latches lock the memory module in place.
8. Reattach the foot cover and stand base.
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User Guide