unplug
it
from
the
power
source
and
telecommunication
lines
until
you
can
speak
to
the
Customer
Support
Center
for
further
guidance.
See
“Information
resources”
on
page
xiii.
v
Power
cords,
plugs,
power
adapters,
extension
cords,
surge
protectors,
or
power
supplies
that
are
cracked,
broken
or
damaged.
v
Signs
of
overheating,
smoke,
sparks
or
fire.
v
Damage
to
a
battery
(such
as
cracks,
dents,
creases),
discharge
from
a
battery,
or
a
buildup
of
foreign
substances
on
the
battery.
v
A
cracking,
hissing
or
popping
sound,
or
strong
odor
that
comes
from
the
product.
v
Signs
that
liquid
has
been
spilled
or
an
object
has
fallen
onto
the
computer
product,
the
power
cord
or
power
adapter.
v
The
computer
product,
the
power
cord
or
power
adapter
has
been
exposed
to
water.
v
The
product
has
been
dropped
or
damaged
in
any
way.
v
The
product
does
not
operate
normally
when
you
follow
the
operating
instructions.
Note:
If
you
notice
these
conditions
with
a
product
(such
as
an
extension
cord)
that
is
not
manufactured
for
or
by
Lenovo,
stop
using
that
product
until
you
can
contact
the
product
manufacturer
for
further
instructions,
or
until
you
get
a
suitable
replacement.
General
safety
guidelines
Always
observe
the
following
precautions
to
reduce
the
risk
of
injury
and
property
damage.
Service
Do
not
attempt
to
service
a
product
yourself
unless
instructed
to
do
so
by
the
Customer
Support
Center.
Use
only
a
service
provider
who
is
approved
to
repair
your
particular
product.
Note:
Some
parts
can
be
upgraded
or
replaced
by
the
customer.
These
parts
are
referred
to
as
Customer
Replaceable
Units,
or
CRUs.
Lenovo
expressly
identifies
CRUs
as
such,
and
provides
documentation
with
instructions
when
it
is
appropriate
for
customers
to
replace
those
parts.
You
must
closely
follow
all
instructions
when
performing
such
replacements.
Always
make
sure
that
the
power
is
turned
off
and
that
the
product
is
unplugged
from
any
power
source
before
you
attempt
the
replacement.
If
you
have
any
questions
or
concerns,
contact
the
Customer
Support
Center.
Although
there
are
no
moving
parts
in
your
computer
after
the
power
cord
has
been
disconnected,
the
following
warnings
are
required
for
proper
UL
certification.
vi
User
Guide
Summary of Contents for 821524U
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