Lenovo
YOGA
BOOK
with
Windows®
25
This
section
presents
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
computer,
this
problem
is
addressed
with
special
nylon
‐
coated
screws
that
have
the
following
characteristics:
•
They
maintain
tight
connections.
•
They
do
not
easily
come
loose,
even
with
shock
or
vibration.
•
They
are
harder
to
tighten.
•
Each
one
should
be
used
only
once.
Do
the
following
when
you
service
this
machine:
•
Keep
the
screw
kit
in
your
tool
bag.
•
Carefully
remove
screws
for
reuse
when
replacing
FRUs.
•
Use
a
torque
screwdriver
if
you
have
one.
Tighten
screws
as
follows:
•
Plastic to plastic
Turn
an
additional
90°
after
the
screw
head
touches
the
surface
of
the
plastic
part:
•
Logic card to plastic
Turn
an
additional
180°
after
the
screw
head
touches
the
surface
of
the
logic
card:
•
Torque driver
If
you
have
a
torque
screwdriver,
refer
to
the
“Torque”
column
for
each
step.
•
Make
sure
that
you
use
the
correct
screws.
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 screws are
tightened firmly
.
•
Ensure
torque
screwdrivers
are
calibrated
correctly
following
country
specifications.
FRU replacement notices
more than 90°
(Cross-section)
more than 180°
(Cross-section)
