Lenovo 3000 C200 User Manual download pdf (Page 48)

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 Lenovo 3000 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 92) 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.

v Make sure that you use the correct screw. 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 of the screws are

tightened firmly.

v Ensure torque screw drivers are calibrated correctly following country

specifications.

Retaining serial numbers

This section includes the following descriptions:

v “Restoring the serial number of the system unit” on page 43

FRU replacement notices

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Lenovo 3000 C200 User Manual Page 48