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Fru replacement notices, Screw notices – Lenovo G505 Notebook User Manual

Page 38

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Lenovo G400/G500/G405/G505/G410/G510 Hardware Maintenance
Manual

34

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.
• Remove screws carefully for reuse.
• Use a torque screwdriver if you have one.

Tighten screws as follows:
• Plastic to plastic

Turn an additional 90° after the screw head touches the surface of the plastic
part:

• Logic card to plastic

Turn an additional 180° after the screw head touches the surface of the logic
card:

• Torque driver

If you have a torque screwdriver , refer to the “Torque” column for each step.

• Make sure that you use the correct screws. 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 screws are
tightened firmly

.

• Ensure torque screwdrivers are calibrated correctly following country

specifications.

FRU replacement notices

more than 90°

(Cross-section)

more than 180°

(Cross-section)

This manual is related to the following products: