IBM 802.11B - Manual (Page 13)

7. Attach the Mini-PCI guide that comes with the option package.
8. Reinstall the battery and the keyboard. (For information on reinstalling the
battery and the keyboard, refer to theThinkPad X30 Series Service and
Troubleshooting Guide.)
For ThinkPad T30 Series computer
If you are using ThinkPad T30 Series computer, do as follows:
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 over.
3. Remove the battery. (For information on removing the battery, refer to the
ThinkPad T30 Series Service and Troubleshooting Guide.)
About the Cisco Aironet Wireless 802.11b Mini PCI by IBM ® 1-7