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If the following symptoms are present, they may indicate
damage caused by non-warranted activity:
Missing parts may be a symptom of unauthorized
service or modification.
HDD spindles can become noisy if subjected to
excessive force or by being dropped.
Screw Notices
The 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 the 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 logic card.
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.
ThinkPad i Series 1400
3