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15.
FM STEREO
BEACON.
This
red LED ittuminates
when
a
stereo
FM
broadcast
is
being
received and decoded
by
the receiver's
multiplex
decoder circuit.
lf a
station
is
broadcasting
in
mono, or
if a
stereo
broadcast
signal
is
too
weak
for reasonably noise-free reception
in stereo, then the
7120
will automatically switch into
mono and
this
light will
not
illuminate. Also,
if
you
have mistuned
the
receiver away
from
the center of
a
station's
broadcast channel,
the
stereo
decoding circuits may not
lock onto
the
signal
and
it may be
received in
mono.
16.
POWER INDICATOR.
This
green
LED iiluminates
whenever lhe
7120
is
turned
on.
A
Note
on Overload
Protection.
Because
the
NAD
7120
sounds
so
clean and
musical
when driven beyond
its
nominal power
rating
and
when used
to drive
low-imped-
ance loudspeakers, you
may be
tempted to stress
it beyond
its
design
capacity. For example
this
receiver
can safely
and
cleanly drive
a
2-ohm
load
impedance,
reproducing wide-
range
musical signals with
peak levels of 50
watts or
more.
Thus
it is
permissible to
play music at
volume
levels which
cause
the transient
peaks and
climaxes
to exceed the
receiver's rated power
by a
considerable margin,
and with
Soft Clipping the
music will
continue to
sound
good
at
those
high
peak
levels.
But if
you overdrive the
receiver
continuously
rather
than only on brief musical
peaks,
the
output
transistors
may
overheat. This is particularly
likely if
you
set
the
SPEAKER
IMPEDANCE
switch
to
8
OHMS
and then
try
to
drive very
low
impedances at
high
volume levels.
Severe abuse
of
this
type could
cause
internal
fuses
to blow
in
order to
protect
the
receiver.
These fuses
are not intended
to be
replaced
by
the user; if the receiver
shuts down you
should
return
it
for service.
lf this occurs, you should
examine
whether
a pattern
of unintended abuse
may have
contributed
to the failure.
For example
you
may have a loose
strand
of speaker wire
causing
a partial short-circuit either
at
the speakers
or at the
receiver's speaker terminals. The
impedance of
your
speak-
ers may
be
lower
than you
think;
if
you
are not
sure,
set the
SPEAKER IMPEDANCE
switch
to NORMAL
(4 OHMS).
You
may be
combining maximum bass
boost
with
high
volume
settings. Or you
may
simply
be playing
the
music at
continu-
ously high power
levels
that demand
a larger amplifier.
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