Lenovo 3000 N500 Manual Do Utilizador
FRU
replacement
notices
This
section
contains
notices
related
to
removing
and
replacing
parts.
Read
this
section
carefully
before
replacing
any
FRU.
Screw
notices
Loose
screws
can
cause
a
reliability
problem.
In
the
Lenovo
3000
computer,
this
problem
is
addressed
with
special
nylon-coated
screws
that
have
the
following
characteristics:
v
They
maintain
tight
connections.
v
They
do
not
easily
come
loose,
even
with
shock
or
vibration.
v
They
are
harder
to
tighten.
v
Each
one
should
be
used
only
once.
Do
the
following
when
you
service
this
machine:
v
Keep
the
screw
kit
(for
the
P/N,
see
in
your
tool
bag.
v
Always
use
new
screws.
v
Use
a
torque
screwdriver
if
you
have
one.
Tighten
screws
as
follows:
v
Plastic
to
plastic
Turn
an
additional
90
degrees
after
the
screw
head
touches
the
surface
of
the
plastic
part:
90 degrees more
(Cross-section)
v
Logic
card
to
plastic
Turn
an
additional
180
degrees
after
the
screw
head
touches
the
surface
of
the
logic
card:
180 degrees more
(Cross-section)
v
Torque
driver
If
you
have
a
torque
driver,
refer
to
the
“Torque”
column
for
each
step.
v
Make
sure
that
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
that
all
of
the
screws
are
tightened
firmly.
v
Ensure
torque
screw
drivers
are
calibrated
correctly
following
country
specifications.
Lenovo
3000
N500
49