180 degrees more
(Cross-section)
Notes:
• Ensure that you use the correct screw. It is recommended to use new screws for replacements. If you
have a torque screwdriver, tighten all screws firmly to the torque specified in the screw information
table for each step.
• Ensure that torque screwdrivers are calibrated correctly following country specifications.
Retaining serial numbers
This topic provides instructions on the following:
•
“Restoring the serial number of the system unit” on page 56
•
“Retaining the UUID” on page 57
Restoring the serial number of the system unit
When the computer was manufactured, the EEPROM on the system board was loaded with the serial
numbers of the system and all major components. These numbers need to remain the same throughout
the life of the computer.
If you replace the system board, you must restore the serial number of the system unit to its original value.
The serial number of the system unit is written on the label attached to the bottom of the computer.
If you can not find the serial number of the system unit on the bottom of the computer, try the following
method to get the number:
Note:
Before you perform the operation, ensure that the UEFI/Legacy setting within the
Startup
menu in
the ThinkPad Setup program is set to
UEFI Only
.
1.
Connect
a
USB
memory
key
to
the
computer.
Note:
Only
an
authorized
Lenovo
service
technician
can
access
the
above
Web
site.
2.
Restart
the
computer.
3.
When
the
logo
screen
is
displayed,
press
Esc.
The
ThinkPad
Config
Information
Update
Utility
interface
is
displayed.
4.
Type
1
under
Enter
the
action
desired
,
then
press
Enter.
The
ThinkPad
Serial
Number
Update
Utility
for
Asset
ID
screen
is
displayed.
5.
Type
2
under
Enter
the
action
desired,
then
press
Enter.
The
serial
number
of
each
device
in
your
computer
is
displayed;
the
serial
number
of
the
system
unit
is
listed
as
follow:
20-
Serial
number
6.
Record
the
serial
number
of
the
system
unit.
After you replace the system board, do the following to restore the serial number of the system unit:
1. Connect the Maintenance Key to the computer.
56
ThinkPad E460 and E465 Hardware Maintenance Manual