Lenovo ThinkPad T520 User Manual page 162

Replacing memory
Note: If your computer is a dual-core processor model, two Dummy DIMM cards are preinstalled and do not
replace the Dummy DIMM cards with SO-DIMMs.
Replacing memory in the slot on the underside of the computer
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 details, refer to the instructions in "Replacing the battery" on page 119.
4. Loosen the two screws on the memory slot cover (1); then remove the cover (2).
5. Remove the SO-DIMM by pressing out on the latches on both edges of the socket at the same time. Be
sure to save it for future use.
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