IBM A21e Hardware Maintenance Manual - Page 52

Retaining serial numbers, for each step. - drivers

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FRU replacement notices 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 reference the P/N, see "Miscellaneous parts" on page 96) 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: v Logic card to plastic Turn an additional 180 degrees after the screw head touches the surface of the logic card: v Torque driver If you have a torque driver, refer to the "Torque" column for each step. v Make sure you use the correct screw. If you have a torque screwdriver, tighten all screws firmly to the torque shown in the table. Never use a screw that you removed. Use a new one. Make sure the screws are tightened firmly. Retaining serial numbers This section includes the following descriptions: v "Restoring the serial number of the system unit" on page 49 v "Retaining the UUID" on page 49 48 ThinkPad A21e

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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 reference the P/N, see
“Miscellaneous parts” on page 96) 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:
v
Logic card to plastic
Turn an additional
180 degrees
after the screw head
touches the surface of the logic card:
v
Torque driver
If you have a torque driver, refer to the “Torque” column
for each step.
v
Make sure you use the correct screw. If you have a
torque screwdriver, tighten all screws firmly to the torque
shown in the table.
Never use a screw that you
removed. Use a new one. Make sure the screws are
tightened firmly.
Retaining serial numbers
This section includes the following descriptions:
v
“Restoring the serial number of the system unit” on
page 49
v
“Retaining the UUID” on page 49
FRU replacement notices
48
ThinkPad A21e