Lenovo ThinkPad T500 Hardware Maintenance Manual - Page 67

Retaining, serial, numbers

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Retaining serial numbers This section includes the following descriptions: v "Restoring the serial number of the system unit" v "Retaining the UUID" v "Reading or writing the ECA information" on page 61 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. Before replacing the system board, save the original serial number by doing the following: 1. Install the ThinkPad Hardware Maintenance Diskette Version 1.73 or later, and restart the computer. 2. From the main menu, select 1. Set System Identification. 3. Select 2. Read S/N data from EEPROM. The serial number of each device in your computer is displayed; the serial number of the system unit is listed as follows: v 20: Serial number Write down that number. Note: The serial number of the system unit is also written on the label attached to the bottom of the computer. After you have replaced the system board, restore the serial number by doing the following: 1. Install the ThinkPad Hardware Maintenance Diskette Version 1.73 or later and restart the computer. 2. From the main menu, select 1. Set System Identification. 3. Select 1. Add S/N data from EEPROM. Follow the instructions on the screen. If the MTM and Product ID numbers differ from each other on the rear label, use what is shown for the Product ID field. See example below: MTM on rear label: TTTT-CTO S/N SSSSSSS Product ID on rear label: TTTT-MMM (Use this number when setting Serial Number) In the example, the Serial Number to be input is '1STTTTMMMSSSSSSS'. Retaining the UUID The Universally Unique Identifier (UUID) is a 128-bit number uniquely assigned to your computer at production and stored in the EEPROM of your system board. The algorithm that generates the number is designed to provide unique IDs until the year A.D. 3400. No two computers in the world have the same number. ThinkPad T500 and W500 (15.4-inch widescreen) 59

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Retaining
serial
numbers
This
section
includes
the
following
descriptions:
v
“Restoring
the
serial
number
of
the
system
unit”
v
“Retaining
the
UUID”
v
“Reading
or
writing
the
ECA
information”
on
page
61
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.
Before
replacing
the
system
board,
save
the
original
serial
number
by
doing
the
following:
1.
Install
the
ThinkPad
Hardware
Maintenance
Diskette
Version
1.73
or
later,
and
restart
the
computer.
2.
From
the
main
menu,
select
1.
Set
System
Identification
.
3.
Select
2.
Read
S/N
data
from
EEPROM
.
The
serial
number
of
each
device
in
your
computer
is
displayed;
the
serial
number
of
the
system
unit
is
listed
as
follows:
v
20:
Serial
number
Write
down
that
number.
Note:
The
serial
number
of
the
system
unit
is
also
written
on
the
label
attached
to
the
bottom
of
the
computer.
After
you
have
replaced
the
system
board,
restore
the
serial
number
by
doing
the
following:
1.
Install
the
ThinkPad
Hardware
Maintenance
Diskette
Version
1.73
or
later
and
restart
the
computer.
2.
From
the
main
menu,
select
1.
Set
System
Identification
.
3.
Select
1.
Add
S/N
data
from
EEPROM
.
Follow
the
instructions
on
the
screen.
If
the
MTM
and
Product
ID
numbers
differ
from
each
other
on
the
rear
label,
use
what
is
shown
for
the
Product
ID
field.
See
example
below:
MTM
on
rear
label:
TTTT-CTO
S/N
SSSSSSS
Product
ID
on
rear
label:
TTTT-MMM
(Use
this
number
when
setting
Serial
Number)
In
the
example,
the
Serial
Number
to
be
input
is
’1STTTTMMMSSSSSSS’.
Retaining
the
UUID
The
Universally
Unique
Identifier
(UUID)
is
a
128-bit
number
uniquely
assigned
to
your
computer
at
production
and
stored
in
the
EEPROM
of
your
system
board.
The
algorithm
that
generates
the
number
is
designed
to
provide
unique
IDs
until
the
year
A.D.
3400.
No
two
computers
in
the
world
have
the
same
number.
ThinkPad
T500
and
W500
(15.4-inch
widescreen)
59