Lenovo ThinkPad T420si Hardware Maintenance Manual - Page 99
System board, fan assembly, 34-mm ExpressCard reader, and base cover
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a 1150 System board, fan assembly, 34-mm ExpressCard reader, and base cover Important notices for handling the system board: When handling the system board, read the following: • 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 6 inches so that it falls flat on a hard bench can subject the accelerometer to as much as 6,000 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. • If a system board is dropped, test it using PC-Doctor for DOS if the system supports PC-Doctor for DOS, to make sure that the HDD Active Protection™ still functions. Note: If the test shows that the HDD Active Protection system is not functioning, be sure to document the drop in any reject report, and replace the system board. • 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. If the system supports PC-Doctor for DOS, after replacing the system board, run PC-Doctor for DOS to make sure that HDD Active Protection system still functions. The procedure is as follows: 1. Place the computer on a horizontal surface. 2. Run Diagnostics ➙ ThinkPad Devices ➙ HDD Active Protection Test. Attention: Do not apply physical shock to the computer while the test is running. For access, remove these FRUs, in order: • "1010 Battery pack" on page 68 • "1020 Serial Ultrabay Slim device or travel bezel" on page 69 • "1030 Solid state drive (SSD) or hard disk drive (HDD)" on page 70 • "1040 DIMM" on page 72 • "1050 PCI Express Mini Card for wireless LAN" on page 74 • "1060 PCI Express Mini Card for wireless WAN" on page 77 Chapter 8. Removing and replacing a FRU 93