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Fru replacement notices, Screw notices – Lenovo Y50-70 User Manual

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Lenovo Y40-70/Y40-80/Y50-70/Y50-80/Y50-70 Touch/ Y50-80 Touch

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.

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

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

plastic part:

more than 90°

(Cross-section)

Logic card to plastic

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

logic card:

more than 180°

(Cross-section)

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.

Carefully remove

screws for reuse when replacing FRUs. Make sure that all screws are

tightened firmly.

• Ensure torque screwdrivers are calibrated correctly following country

specifications.

This manual is related to the following products: