Install A Memory Module - IBM ThinkPad X20 Supplementary Manual

Replacing the battery
6. Turn the computer right side up. Connect the ac adapter and the cables to
the computer.

Install a memory module

To install the DIMM, do the following:
1. Turn off the computer, then disconnect the ac adapter and all cables from
the computer.
2. Close the computer display, and turn the computer upside down.
3. Remove the battery pack.
4. Loosen the screw on the memory slot cover; then remove the cover..
5. Find the notch on the side of the DIMM.
Attention: To avoid damaging the DIMM, do not touch its contact edge.
6. With the notched end of the DIMM toward the right side of the socket,
insert the DIMM, at an angle of about 20 degrees, into the socket 1 ; then
press it firmly 2 .
7. Pivot the DIMM until it snaps into place.
Make sure that the card is firmly fixed in the slot and not moved easily.
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ThinkPad X Series Service and Troubleshooting Guide