Lenovo ThinkPad T42 Hardware Maintenance Manual - Page 144

Important, remove, security, system, board, cannot

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Removing and replacing a FRU v System board without the security chip (bottom view) Begin by checking the FRU number of the system board, and be sure to use the correct system board for the computer. For the FRU numbers, see "Parts list" on page 190. Important If the ThinkPad computer you are servicing has a security chip, bear the following in mind: v Do not remove the security chip from the system board. If the security chip is removed by accident, reinstall it on the system board immediately. Make sure that it is firmly fixed on the system board and does not move easily. v The security chip cannot be used with any other system board. v The system board cannot be used with any other security chip. v The system board cannot be used without the security chip. v If you return a defective system board, you must check whether the security chip is embedded. If it is not, the board may not be covered under warranty. 138 T40/T40p, T41/T41p, T42/T42p

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v
System
board
without
the
security
chip
(bottom
view)
Begin
by
checking
the
FRU
number
of
the
system
board,
and
be
sure
to
use
the
correct
system
board
for
the
computer.
For
the
FRU
numbers,
see
“Parts
list”
on
page
190.
Important
If
the
ThinkPad
computer
you
are
servicing
has
a
security
chip,
bear
the
following
in
mind:
v
Do
not
remove
the
security
chip
from
the
system
board
.
If
the
security
chip
is
removed
by
accident,
reinstall
it
on
the
system
board
immediately.
Make
sure
that
it
is
firmly
fixed
on
the
system
board
and
does
not
move
easily.
v
The
security
chip
cannot
be
used
with
any
other
system
board.
v
The
system
board
cannot
be
used
with
any
other
security
chip.
v
The
system
board
cannot
be
used
without
the
security
chip.
v
If
you
return
a
defective
system
board,
you
must
check
whether
the
security
chip
is
embedded.
If
it
is
not,
the
board
may
not
be
covered
under
warranty.
Removing
and
replacing
a
FRU
138
T40/T40p,
T41/T41p,
T42/T42p