IBM A22M, A21M FRU replacement notices, Screw notices, Plastic to plastic, Logic card to plastic

FRU replacement notices

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 IBM ThinkPad computer, 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.

vThey 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 145) in your tool bag.

vAlways use new screws.

vUse a torque screwdriver if you have one.

Tighten screws as follows:

vPlastic to plastic

Turn an additional 90 degrees after the screw head touches the surface of the plastic part:

90 degrees more

(Cross-section)

vLogic card to plastic

Turn an additional 180 degrees after the screw head touches the surface of the logic card:

180 degrees more

(Cross-section)

vTorque driver

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

56ThinkPad A20m/p, A21m/p, A22m/p