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Restoring the serial number of the system unit, Retaining the uuid, Reading or writing the eca information – Lenovo Z61e User Manual

Page 61: Restoring, Serial, Number, System, Unit, Retaining, Uuid

background image

v

“Retaining

the

UUID”

v

“Reading

or

writing

the

ECA

information”

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.

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

1.73

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.

FRU

replacement

notices

ThinkPad

Z61e,

Z61m,

and

Z61p

55

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