Lenovo ThinkPad T420 (English) User Guide - Page 142
Replacing memory in the slot on the underside of the computer
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Replacing memory in the slot on the underside of the computer Your computer has two memory slots: one under the keyboard and another on the underside of the computer. To replace the SO-DIMM, follow the procedure below: 1. Turn off the computer; then disconnect the ac power adapter and all cables from the computer. 2. Close the computer display, and turn it over. 3. Remove the battery. For more information, refer to "Replacing the battery" on page 111. 4. Loosen the screw on the memory slot cover (1), and then remove the cover (2). If an SO-DIMM is already in the memory slot, remove it to make room for the new one by pressing out on the latches on both edges of the socket at the same time (1). Be sure to save it for future use (2). 5. Find the notch on the contact edge side of the SO-DIMM you are installing. Note: To avoid damaging the SO-DIMM, do not touch its contact edge. 124 User Guide