Lenovo 59404953 Datasheet download pdf (Page 35)

Lenovo Yoga 2 11

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 rmly to the torque shown in the table. Carefully remove

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

tightened rmly.

• Ensure torque screwdrivers are calibrated correctly following country

specications.

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Lenovo 59404953 Datasheet Page 35