Cleaning and maintenance, Using headphones or earphones, Additional safety information – Lenovo ThinkCentre M57e Manuel d'utilisation
Page 24: Cleaning, Maintenance, Using, Headphones, Earphones, Additional, Safety
Cleaning
and
maintenance
Keep
your
computer
and
workspace
clean.
Shut
down
the
computer
and
then
disconnect
the
power
cord
before
cleaning
the
computer.
Do
not
spray
any
liquid
detergent
directly
on
the
computer
or
use
any
detergent
containing
flammable
material
to
clean
the
computer.
Spray
the
detergent
on
a
soft
cloth
and
then
wipe
the
computer
surfaces.
Using
headphones
or
earphones
If
your
computer
has
both
a
headphone
connector
and
an
audio
line-out
connector,
always
use
the
headphone
connector
for
headphones
(also
called
a
headset)
or
earphones.
CAUTION:
Excessive
sound
pressure
from
earphones
and
headphones
can
cause
hearing
loss.
Adjustment
of
the
equalizer
to
maximum
increases
the
earphones
and
headphones
output
voltage
and
therefore
the
sound
pressure
level.
Excessive
use
of
headphones
or
earphones
for
a
long
period
of
time
at
high
volume
can
be
dangerous
if
the
output
of
the
headphone
or
earphone
connectors
do
not
comply
with
specifications
of
EN
50332-2.
The
headphone
output
connector
of
your
computer
complies
with
EN
50332-2
Sub
clause
7.
This
specification
limits
the
computer’s
maximum
wide
band
true
RMS
output
voltage
to
150
mV.
To
help
protect
against
hearing
loss,
ensure
that
the
headphones
or
earphones
you
use
also
comply
with
EN
50332-2
(Clause
7
Limits)
for
a
wide
band
characteristic
voltage
of
75
mV.
Using
headphones
that
do
not
comply
with
EN
50332-2
can
be
dangerous
due
to
excessive
sound
pressure
levels.
If
your
Lenovo
computer
came
with
headphones
or
earphones
in
the
package,
as
a
set,
the
combination
of
the
headphones
or
earphones
and
the
computer
already
complies
with
the
specifications
of
EN
50332-1.
If
different
headphones
or
earphones
are
used,
ensure
that
they
comply
with
EN
50332-1
(Clause
6.5
Limitation
Values).
Using
headphones
that
do
not
comply
with
EN
50332-1
can
be
dangerous
due
to
excessive
sound
pressure
levels.
Additional
safety
information
CAUTION:
Plastic
bags
can
be
dangerous.
Keep
plastic
bags
away
from
babies
and
children
to
avoid
danger
of
suffocation.
20
Safety
and
Warranty
Guide