FRU replacement notices
This section contains notices related to removing and replacing parts. Read this
section carefully before replacing any FRU.
Loose screws can cause a reliability problem. In the ThinkPad computer, this
problem is addressed with special nylon-coated screws that have the following
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 161) in your
v Always use new screws.
v Use a torque screwdriver if you have one.
Tighten screws as follows:
v Plastic to plastic
v Logic card to plastic
v Torque driver
v Make sure that you use the correct screw. If you have a torque screwdriver,
v Ensure torque screw drivers are calibrated correctly following country
ThinkPad T500 and W500 (15.4-inch widescreen) Hardware Maintenance Manual
Turn an additional 90 degrees after the screw head touches the surface of the
Turn an additional 180 degrees after the screw head touches the surface of the
If you have a torque driver, refer to the "Torque" column for each step.
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
90 degrees more
180 degrees more