Lenovo 28762JU User Manual - Page 100
System board, fan assembly, and backup battery, Important notices for handling the system board
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1120 System board, fan assembly, and backup battery Important notices for handling the system board: When handling the system board, bear the following in mind. v The system board has an accelerometer, which can be broken by applying several thousands of G-forces. 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. v Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or composite. v If a system board is dropped, you must test it, using PC-Doctor for DOS, to make sure that the HDD Active Protection still functions (see below). Note: If the test shows that HDD Active Protection is not functioning, be sure to document the drop in any reject report, and replace the system board. v Avoid rough handling of any kind. v At every point in the process, be sure not to drop or stack the system board. v If you put a system board down, be sure to put it only on a padded surface such as an ESD mat or conductive corrugated material. After replacing the system board, run PC-Doctor for DOS to make sure that HDD Active Protection 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. Note: The fan assembly and the backup battery are attached to the system board. For access, remove these FRUs in order: v "1010 Battery pack" on page 71 v "1020 Bottom door" on page 73 v "1030 Hard disk drive (HDD)" on page 75 v "1080 Keyboard" on page 82 v "1090 Palm rest assembly, power-on board assembly (with cable), and microphone" on page 85 92 ThinkPad X100e Hardware Maintenance Manual