IBM 2681 Hardware Maintenance Manual - Page 65

Retaining, serial, numbers

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FRU replacement notices 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" v "Retaining the UUID" 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 1.69, 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 for each device is displayed. Write down the serial number of the system unit, designated as follows: 20: System unit serial number After you have replaced the system board, restore the serial number by doing the following: 1. Install the ThinkPad hardware maintenance diskette version 1.69, 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. Note: The serial number of the system unit is written on the label attached on the bottom of the computer. Retaining the UUID The Universally Unique Identifier (UUID) is a 128-bit number uniquely assigned to your computer at production ThinkPad R40 61

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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
”
v
“
Retaining
the
UUID
”
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
1.69,
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
for
each
device
is
displayed.
Write
down
the
serial
number
of
the
system
unit,
designated
as
follows:
20:
System
unit
serial
number
After
you
have
replaced
the
system
board,
restore
the
serial
number
by
doing
the
following:
1.
Install
the
ThinkPad
hardware
maintenance
diskette
version
1.69,
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.
Note:
The
serial
number
of
the
system
unit
is
written
on
the
label
attached
on
the
bottom
of
the
computer.
Retaining
the
UUID
The
Universally
Unique
Identifier
(UUID)
is
a
128-bit
number
uniquely
assigned
to
your
computer
at
production
FRU
replacement
notices
ThinkPad
R40
61