User Manual

4. Detach the connector 1 , and then remove the coin-cell battery 2 .

5. Install the new coin-cell battery 1 , and then attach the connector 2 .

6. Reinstall the base cover assembly.

7. Connect the ac power adapter and all disconnected cables to the computer.

8. Reset the system date and time in the UEFI BIOS menu. See “Set the system date and time” on page 46.

Wireless WAN card (for selected models)

The following information is only for the computer with user-installable modules. Ensure that you use only a

Lenovo-authorized wireless module specifically tested for this computer model. Otherwise, the computer will

generate an error-code beep sequence when you turn on the computer.

Prerequisite

Before you start, read Appendix A “Important safety information” on page 85 and print the following

instructions.

Attention: Do not touch the contact edge of the wireless-WAN card. Otherwise the wireless-WAN card

might get damaged.

Replacement procedure for wireless-WAN card with two antenna cables

1. Disable the built-in battery. See “Disable Fast Startup and the built-in battery” on page 51.

T490, T590, P43s, and P53s User Guide