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IBM THINKPAD T500 Hardware Maintenance Manual: Fru Replacement Notices; Screw Notices

15.4-inch widescreen.
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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
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
tool bag.
Turn an additional 90 degrees after the screw head touches the surface of the
plastic part:
Turn an additional 180 degrees after the screw head touches the surface of the
logic card:
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
tightened firmly.
90 degrees more
180 degrees more



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