IBM 2388 Hardware Maintenance Manual - Page 67

Retaining, Reading, writing, information - disassembly

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FRU replacement notices 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. When you replace the system board, you must set the UUID on the new system board as follows: 1. Install the ThinkPad Hardware Maintenance Diskette Version 1.69 or later, and restart the computer. 2. From the main menu, select 4. Assign UUID. A new UUID is created and written. If a valid UUID already exists, it is not overwritten. Reading or writing the ECA information Information on Engineering Change Announcements (ECA) are stored in the EEPROM of the system board. The electronic storage of this information simplifies the procedure to check if the ECA has been previously applied to a machine. The machine does not need to be disassembled to check for the ECA application. To check what ECAs have been previously applied to the machine, use the ECA Information Read/Write function on the ThinkPad Hardware Maintenance Diskette Version 1.69 or later. 1. Insert the ThinkPad Hardware Maintenance Diskette Version 1.69 or later, and restart the computer. 2. From the main menu, select 6. Set ECA Information. 3. To read ECA information, select 2. Read ECA/rework number from EEPROM and follow the instruction. 4. To read box build date, select 5. Read box build date from EEPROM, and follow the instruction on the screen. After an ECA has been applied to the machine, the EEPROM must be updated to reflect the ECA's application. Use the ThinkPad Hardware Maintenance Diskette Version 1.69 or later to update the EEPROM. Note: Only the ECA number is stored in the EEPROM. The machine type of the ECA is assumed be the same as the machine type of the machine that had the ECA applied to it. 1. Insert the ThinkPad Hardware Maintenance Diskette Version 1.69 or later, and restart the computer. 2. From the main menu, select 6. Set ECA Information. ThinkPad G40, G41 63

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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.
When
you
replace
the
system
board,
you
must
set
the
UUID
on
the
new
system
board
as
follows:
1.
Install
the
ThinkPad
Hardware
Maintenance
Diskette
Version
1.69
or
later,
and
restart
the
computer.
2.
From
the
main
menu,
select
4.
Assign
UUID
.
A
new
UUID
is
created
and
written.
If
a
valid
UUID
already
exists,
it
is
not
overwritten.
Reading
or
writing
the
ECA
information
Information
on
Engineering
Change
Announcements
(ECA)
are
stored
in
the
EEPROM
of
the
system
board.
The
electronic
storage
of
this
information
simplifies
the
procedure
to
check
if
the
ECA
has
been
previously
applied
to
a
machine.
The
machine
does
not
need
to
be
disassembled
to
check
for
the
ECA
application.
To
check
what
ECAs
have
been
previously
applied
to
the
machine,
use
the
ECA
Information
Read/Write
function
on
the
ThinkPad
Hardware
Maintenance
Diskette
Version
1.69
or
later.
1.
Insert
the
ThinkPad
Hardware
Maintenance
Diskette
Version
1.69
or
later,
and
restart
the
computer.
2.
From
the
main
menu,
select
6.
Set
ECA
Information
.
3.
To
read
ECA
information,
select
2.
Read
ECA/rework
number
from
EEPROM
and
follow
the
instruction.
4.
To
read
box
build
date,
select
5.
Read
box
build
date
from
EEPROM
,
and
follow
the
instruction
on
the
screen.
After
an
ECA
has
been
applied
to
the
machine,
the
EEPROM
must
be
updated
to
reflect
the
ECA's
application.
Use
the
ThinkPad
Hardware
Maintenance
Diskette
Version
1.69
or
later
to
update
the
EEPROM.
Note:
Only
the
ECA
number
is
stored
in
the
EEPROM.
The
machine
type
of
the
ECA
is
assumed
be
the
same
as
the
machine
type
of
the
machine
that
had
the
ECA
applied
to
it.
1.
Insert
the
ThinkPad
Hardware
Maintenance
Diskette
Version
1.69
or
later,
and
restart
the
computer.
2.
From
the
main
menu,
select
6.
Set
ECA
Information
.
FRU
replacement
notices
ThinkPad
G40,
G41
63