Lenovo ThinkPad L420 User Manual page 116

Replacing the solid state drive
To replace the solid state drive, do the following:
1. Turn off the computer, then disconnect the ac power adapter and all cables from the computer.
2. Close the computer display, and turn the computer over.
3. Remove the battery. See "Replacing the battery" on page 89.
4. Loosen the screws, and then remove the cover.
Attention: Do not touch any exposed parts other than those referred to in this procedure. Unnecessary
contacts with the electric and electronic components might cause your computer to malfunction.
5. Pull the solid state drive to the right.
6. Remove the solid state drive by lifting its left side.
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User Guide