Lenovo ThinkPad T40 Hardware Maintenance Manual page 146

Removing and replacing a FRU
Important
When handling the system board in ThinkPad T41
series, bear the following in mind.
v The system board of the ThinkPad T41 series
has an accelerometer, which can be broken by
applying several thousands of G-forces.
Note: Dropping a system board from a height of
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
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 --> Other Devices --> HDD
Active Protection Test.
Attention:
computer while the test is running.
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T40/T40p, T41/T41p, T42/T42p
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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.
Protection is not functioning, be sure to
document the drop in any reject report,
and replace the system board.
Do not apply physical shock to the