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FRU replacement notices
This section contains notices related to removing and replacing parts. Read this
section carefully before replacing any FRU.
Screw notices
Loose screws can cause a reliability problem. In the ThinkPad computer, this
problem is addressed with special nylon-coated screws that have the following
characteristics:
v They maintain tight connections.
v They do not easily come loose, even with shock or vibration.
v They are harder to tighten.
v Each one should be used only once.
Do
the following when you service this machine:
v Keep the screw kit (for the P/N, see “Miscellaneous parts” on page 159) in your
tool bag.
v Always use new screws.
v Use a torque screwdriver if you have one.
Tighten
screws as follows:
v Plastic to plastic
Turn an additional 90 degrees after the screw head touches the surface of the
plastic part:
90 degrees more
(Cross-section)
v Logic card to plastic
Turn an additional 180 degrees after the screw head touches the surface of the
logic card:
180 degrees more
(Cross-section)
v Torque driver
If you have a torque driver, refer to the “Torque” column for each step.
v Make sure that you use the correct screw. If you have a torque screwdriver,
tighten all screws firmly to the torque shown in the table. Never use a screw
that you removed. Use a new one. Make sure that all of the screws are
tightened firmly.
v Ensure torque screwdrivers are calibrated correctly following country
specifications.
Retaining serial numbers
This section includes the following descriptions:
v “Restoring the serial number of the system unit” on page 53
FRU replacement notices
52 MT 8747, 8749, 9440, 9441, 9442, 9443, and 9448