User Guide

6. Install a new wireless-WAN card by doing the following:

a. Align the contact edge of the new wireless-WAN card with the key in the slot. Then, carefully insert

the card into the slot at an angle of about 20 degrees

1 . Pivot the card downward 2 .

b. Install the screw to secure the wireless-WAN card in place

3 . Connect the antenna cables to the

card

4 . Ensure that you connect the orange cable to the main connector on the card, and the blue

cable to the auxiliary connector on the card.

7. Reinstall the base cover assembly.

8. Turn the computer over. Connect the ac power adapter and all disconnected cables to the computer.

Keyboard (for ThinkPad X390 only)

Prerequisite

Before you start, read Appendix A “Important safety information” on page 71 and print the following

instructions.

Replacement procedure

Note: You might be instructed to slide the keyboard frame forward or backward in some of the following

steps. In this case, ensure that you do not press or hold the keys while sliding the keyboard frame.

Otherwise, the keyboard frame cannot be moved.

1. Disable the built-in battery. See “Disable Fast Startup and the built-in battery” on page 49.

2. Turn off the computer and disconnect the computer from ac power and all connected cables.

T490s and X390 User Guide