• “1010 Removable battery” on page 64 • “1020 Nano-SIM card” on page 65 • “1030 Base cover assembly” on page 65 • “1040 Memory module” on page 68 • “1050 Internal storage drive” on page 69 • “1060 Wireless-WAN card” on page 73 or “1080 M.2 solid-state drive in the Wireless-WAN-card slot” on page 74 • “1070 Wireless-LAN module” on page 73 • “1090 Keyboard” on page 75 • “1100 Coin-cell battery” on page 77 • “1110 Speaker assembly” on page 78 • “1120 Built-in battery” on page 79 • “1140 I/O bracket and RJ45 bracket” on page 81 • “1150 Thermal fan assembly” on page 82 The following components soldered on the top side of the system board are extremely sensitive. When you service the system board, avoid any kind of rough handling. a Graphics processing unit (GPU) b Central processing unit (CPU) c Embedded controller TM d Accelerometer chip for the hard disk drive Active Protection System Note: The graphics chip a is only for discrete-graphics models. c d 86 T480 Hardware Maintenance Manual