Lenovo ThinkPad T400s 2823 Hardware Maintenance Manual

Contents

1160 System board, fan assembly, and 34-mm ExpressCard slot frameImportant 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 applyingseveral thousands of G-forces.Note: Dropping a system board from a height of as little as 6 inches so that itfalls flat on a hard bench can subject the accelerometer to as much as 6,000 G’sof shock.v Be careful not to drop the system board on a bench top that has a hardsurface, such as metal, wood, or composite.v If a system board is dropped, you must test it, using PC-Doctor for DOS, tomake sure that the HDD Active Protection still functions (see below).Note: If the test shows that HDD Active Protection is not functioning, be sureto 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 surfacesuch as an ESD mat or conductive corrugated material.After replacing the system board, run PC-Doctor for DOS to make sure thatHDD 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 isrunning.For access, remove these FRUs, in order:v “1010 Battery pack” on page 83v “1020 Ultrabay Slim Media Bay device or travel bezel” on page 84v “1030 Solid state drive (SSD) or hard disk drive (HDD)” on page 85v “1050 PCI Express Mini Card for wireless LAN” on page 89v “1060 PCI Express Mini Card for wireless WAN” on page 92v “1070 Keyboard” on page 95v “1090 Wireless USB adapter or Intel Turbo Memory” on page 101v “1100 Palm rest or palm rest with fingerprint reader” on page 103v “1110 Bluetooth daughter card (BDC-2)” on page 105v “1120 Keyboard bezel and speaker assembly” on page 106v “1130 5-in-1 Media Card Reader adapter” on page 110v “1140 Bluetooth–wireless radio switch FPC” on page 111v “1150 LCD unit” on page 113Removing and replacing a FRU 117