This computer uses special nylon-coated screws with the
following characteristics:
They maintain tight connections.
They do not easily come loose, even with shock or
vibration.
They need additional force to tighten.
They should be used only once.
Do the following when you service this machine:
Keep the screw kit (P/N 05K4841) in your tool bag.
Always use new screws if you are instructed.
Use a torque screwdriver if you have one.
Loose screws can cause a reliability problem. The IBM
ThinkPad computer addresses this problem with nylon-
coated screws. Tighten screws as follows:
Plastic to plastic
Turn an additional 90 degrees after the screw head
touches the surface of the plastic part:
Logic card to plastic
Turn an additional 180 degrees after the screw head
touches the surface of the plastic part:
Torque driver
If you have a torque driver, refer to the "Torque"
column with each step.
Make sure you use the correct screw, and tighten all
screws firmly to the torque shown in the table if you
have a torque screwdriver. Never use a screw that
you removed. Use a new one. Make sure the
screws are tightened firmly.
108 ThinkPad i Series 1400 HMM