5.
Lift the board straight up out of the computer (4)
Reverse this procedure to install the USB board.
System board
NOTE: All system board spare part kits include replacement thermal material.
Description Spare part number
System boards for use in all countries and regions except for Russia and the
People's Republic of China:
For use in UMA models with WWAN 646325-001
For use UMA models without WWAN 646326-001
System boards for use in only in Russia and the People's Republic of China:
For use in UMA models with WWAN 655567-001
For use UMA models without WWAN 655568-001
90 Chapter 4 Removal and replacement procedures