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 the IBM
ThinkPad computer, this problem is addressed 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 Each one should be used only once.

Do the following when you service this machine:

v Keep the screw kit (for the P/N, see “Miscellaneous
parts” on page 265) 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:

90degrees more

(Cross-section)

v Logic card to plastic

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

180degrees more

(Cross-section)

v Torque driver

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

ThinkPad R50/R50p and R51 Series 63