Lenovo ThinkPad X22 ThinkPad X20, X21, X22, X23, X24 Hardware Maintenance Manu - Page 58
FRU replacement notices, Screw notices, degrees more, Cross
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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. The IBM ThinkPad computer addresses this problem 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 They should be used only once. Do the following when you service this machine: v Keep the screw kit (P/N 05K4841) 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 54 ThinkPad X20, X21, X22, X23, X24