Lenovo ThinkPad T550 (English) Hardware Maintenance Manual - ThinkPad T550, W5 - Page 86
bracket on are applied.
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• The system board has an accelerometer, which can be broken when several thousands of G-forces are applied. Note: Dropping a system board from a height of as little as six inches so that it falls flat on a hard bench can subject the accelerometer to as much as 6000 G's of shock. • Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or composite. • Avoid rough handling of any kind. • At every point in the process, be sure not to drop or stack the system board. • If you put a system board down, be sure to put it only on a padded surface such as an ESD mat or a corrugated conductive material. For access, remove these FRUs in order: • "1010 Removable battery" on page 57 • "1020 Base cover assembly" on page 57 • "1040 Storage-drive stabilizer bar, internal storage drive, hard disk drive cable, and hard disk drive bracket" on page 64 • "1060 Wireless LAN card" on page 66 • "1070 Wireless WAN card" on page 67 • "1130 Thermal fan" on page 73 • "1140 Speaker assembly" on page 75 Attention: The microprocessor a and GPU b soldered on the system board are extremely sensitive. When you service the system board, avoid any kind of rough handling. a b 80 Hardware Maintenance Manual