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:
• They m aintain tight connections.
• They do not easily come loose, even with shock or
vibration.
• They are harder to tighten.
• They should be used only once.
Do the following when you service this machine:
• Keep the screw kit (for the P/N, see “Miscellaneous
parts” on page 169) in your tool bag.
• Always use new screws.
• Use a torque screw driver if you have one.
Tighten screws as follows:
• P la s tic to p la s tic
Turn an additional 90 degrees after the screw head
touches the surface of the plastic part:
90 degrees more
7 7 7
/
7 7 7 7
/
(Cross-section)
L o g ic card to p la s tic
Turn an additional 180 degrees after the screw head
touches the surface of the logic card:
180 degrees more
/ / / 7 l
r~r— i
V / / /
(Cross-section)
Torq ue d rive r
If you have a torque driver, refer to the “Torque” column
for each step.
6 0 ThinkPad R40
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