Lenovo ThinkPad T420si (English) User Guide - Page 131
If your computer has a MIMO Multiple Input Multiple Output feature
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11. Put the memory slot cover back in place (1), close the cover (2), and then tighten the screws (3). 12. Reinstall the battery. For more information about how to reinstall the battery, refer to "Replacing the battery" on page 97. 13. Turn the computer over again. Connect the ac power adapter and cables to the computer; then turn it on. Replacing a PCI Express Mini Card with three connectors If your computer has a MIMO (Multiple Input Multiple Output) feature, a PCI Express Mini Card that has three connectors comes with the computer. To replace the card for the MIMO feature, do as follows: 1. Turn off the computer; then disconnect the ac power adapter and all cables from the computer. Wait for a few minutes, till the inside of the computer cools, before you start the following procedures. 2. Close the computer display, and turn the computer over. 3. Remove the battery. For more information about how to remove the battery, refer to "Replacing the battery" on page 97. 4. Loosen the screws on the memory slot cover (1), then remove the cover (2). Chapter 6. Replacing devices 115