Lenovo 019726U FRU replacement notices

FRU replacement notices

This chapter presents notices related to removing and replacing parts. Read this

chapter carefully before replacing any FRU.

Loose screws can cause a reliability problem. In the ThinkPad Notebook, this

problem is addressed with special nylon-coated screws that have the following

characteristics:

vThey maintain tight connections.

vThey do not easily come loose, even with shock or vibration.

vThey are harder to tighten.

vEach one should be used only once.

Do the following when you service this machine:

vKeep the screw kit (for the P/N, see “Miscellaneous parts” on page 130) in your

tool bag.

vAlways use new screws.

vUse a torque screwdriver if you have one.

Tighten screws as follows:

vPlastic to plastic

Turnan additional 90 degrees after the screw head touches the surface of the

plastic part:

90degrees more

(Cross-section)

vLogic card to plastic

Turnan additional 180 degrees after the screw head touches the surface of the

logic card:

180degrees more

(Cross-section)

vTorquedriver

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

vMake 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.

vEnsure torque screw drivers are calibrated correctlyfollowing country

specifications.