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:
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 (for the P/N, see “Miscellaneous
parts” on page 164) 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
Turn an additional 180 degrees after the screw head
touches the surface of the logic card:
180 degrees more
(Cross-section)
v
Torque driver
If you have a torque driver, refer to the “Torque” column
for each step.
FRU replacement notices
60
ThinkPad R40
Summary of Contents for ThinkPad R40
Page 1: ...IBM Mobile Systems ThinkPad Computer Hardware Maintenance Manual IBM...
Page 6: ...2 ThinkPad R40...
Page 46: ...Checkout guide 42 ThinkPad R40...
Page 88: ...3 Removing and replacing a FRU 84 ThinkPad R40...
Page 93: ...Modem daughter card MDC 3 4 5 continued Removing and replacing a FRU ThinkPad R40 89...
Page 105: ...7 7 Removing and replacing a FRU ThinkPad R40 101...
Page 132: ...5 6 7 8 10 11 12 13 14 9 1 2 3 4 15 16 Locations 128 ThinkPad R40...
Page 160: ...LCD FRUs 1 2 3 5 6 4 Parts list 156 ThinkPad R40...
Page 178: ...IBMR Part Number 92P1332 Printed in U S A 1P P N 92P1332...