Lenovo ThinkPad T520 User Manual page 156

4. Remove the keyboard. For details, refer to the instructions in "Replacing the keyboard" on page 130.
5. 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. Be sure to save it for future use.
6. Find the notch on the contact edge side of the SO-DIMM you are installing.
Attention: To avoid damaging the SO-DIMM, do not touch its contact edge.
7. With the notched end of the SO-DIMM toward the contact edge side of the socket, insert the SO-DIMM
(1) into the socket at an angle of about 20 degrees; then press it in firmly (2).
Note: If you install a memory module in only one of the two memory slots, install it in the slot under the
keyboard.
8. Pivot the SO-DIMM downward until it snaps into place.
9. Make sure that the SO-DIMM is firmly fixed in the slot and cannot be moved easily.
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