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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 characteristics:

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.

the following when you service this machine:

v Keep the screw kit (for the P/N, see “Miscellaneous

parts” on page 217) in your tool bag.

v Always use new screws.

v Use a torque screwdriver if you have one.

Tighten

screws as follows:

v Plastic to plastic

Turn an additional 90 degrees after the screw head

touches the surface of the plastic part:

90 degrees more

(Cross-section)

v Logic card to plastic

Turn an additional 180 degrees after the screw head

touches the surface of the logic card:

180 degrees more

(Cross-section)

v Torque driver

If you have a torque driver, refer to the “Torque” column

for each step.

FRU replacement notices

62 R50/R50p, R51 Series

Lenovo ThinkPad R50e Series Hardware Maintenance Manual

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