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Important
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 --> Other Devices --> HDD
Active Protection Test.
Attention: Do not apply physical shock to the
computer while the test is running.
Removing and replacing a FRU
ThinkPad T43/T43p Series 135