Lenovo ThinkCentre M55 (English) User guide - Page 8

General, safety, guidelines, Service - power supply replacement

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In the unlikely event that you notice any of the following conditions, or if you have any safety concerns with your product, stop using the product and unplug it from the power source and telecommunication lines until you can speak to the Customer Support Center for further guidance. 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, power cord, or power adapter. v The computer product, 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 or your documentation. Only use a service provider who is approved to repair your particular product. Note: Some computer 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. For more information on CRUs, refer to the warranty and safety information that is provided with your computer. 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

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In
the
unlikely
event
that
you
notice
any
of
the
following
conditions,
or
if
you
have
any
safety
concerns
with
your
product,
stop
using
the
product
and
unplug
it
from
the
power
source
and
telecommunication
lines
until
you
can
speak
to
the
Customer
Support
Center
for
further
guidance.
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,
power
cord,
or
power
adapter.
v
The
computer
product,
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
or
your
documentation.
Only
use
a
service
provider
who
is
approved
to
repair
your
particular
product.
Note:
Some
computer
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.
For
more
information
on
CRUs,
refer
to
the
warranty
and
safety
information
that
is
provided
with
your
computer.
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