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Hardware Maintenance Manual
FRU replacement notices
This section presents 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 Lenovo computer, this
problem is addressed with special nylon-coated screws that have the following
characteristics:
• They maintain tight connections.
• They do not easily come loose, even with shock or vibration.
• They are harder to tighten.
• Each one should be used only once.
Do the following when you service this machine:
• Keep the screw kit in your tool bag.
• Carefully remove screws for reuse when replacing FRUs.
• Use a torque screwdriver if you have one.
Tighten screws as follows:
• Plastic to plastic
• Logic card to plastic
• Torque driver
• Make sure that you use the correct screws. If you have a torque screwdriver,
• Ensure torque screwdrivers are calibrated correctly following country
32
Turn an additional 90° after the screw head touches the surface of the
plastic part:
Turn an additional 180° after the screw head touches the surface of the
logic card:
If you have a torque screwdriver , refer to the "Torque" column for each step.
tighten all screws firmly to the torque shown in the table. Carefully remove
screws for reuse when replacing FRUs. Make sure that all screws are
tightened firmly.
specifications.
more than 90°
(Cross-section)
more than 180°
(Cross-section)
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