Lenovo 2904G2U User Manual - Page 128
System board, fan assembly, and 34-mm ExpressCard slot frame
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1160 System board, fan assembly, and 34-mm ExpressCard slot frame 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. For access, remove these FRUs, in order: v "1010 Battery pack" on page 85 v "1020 Serial Ultrabay Slim device or travel bezel" on page 86 v "1030 Solid state drive (SSD) or hard disk drive (HDD)" on page 87 v "1050 PCI Express Mini Card for wireless LAN" on page 92 v "1060 PCI Express Mini Card for wireless WAN" on page 95 v "1070 Keyboard" on page 98 v "1090 Wireless USB adapter or Intel Turbo Memory" on page 104 v "1100 Palm rest or palm rest with fingerprint reader" on page 106 v "1110 Bluetooth daughter card (BDC-2)" on page 108 v "1120 Keyboard bezel and speaker assembly" on page 109 v "1130 5-in-1 Media Card Reader adapter" on page 113 v "1140 Bluetooth-wireless radio switch FPC" on page 114 v "1150 LCD unit" on page 116 120 ThinkPad T400s, T410s, and T410si Hardware Maintenance Manual