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
1.73
or
later.
1.
Insert
the
ThinkPad
Hardware
Maintenance
Diskette
Version
1.73
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
1.73
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
1.73
or
later,
and
restart
the
computer.
2.
From
the
main
menu,
select
6.
Set
ECA
Information
.
3.
To
write
ECA
information,
select
1.
Write
ECA/rework
number
from
EEPROM
,
and
follow
the
instruction.
4.
To
write
box
build
date,
select
4.
Write
box
build
date
from
EEPROM
,
and
follow
the
instruction
on
the
screen.
If
the
system
board
is
being
replaced,
try
to
read
the
ECA
information
from
the
old
system
board
and
transfer
the
information
to
the
new
system.
If
the
system
board
is
inoperable,
this
will
not
be
possible.
ThinkPad
T400
and
R400
(14.1-inch
widescreen)
61
Summary of Contents for XT904UT
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