wanted, and re-ENTER it into the pre-set. If you accidentally
press ENTER, you can force the tuner
to
back out of the
ENTER mode by tapping the manual
TUNING rocker
or
by
switching luning bands (i.e. from
FM
to AM and back).
MONO. The ENTER button has two additional special
functions.
One of these is a mono/stereo switch for the
FM
tuner. If a stereo broadcast signal
is
too weak for reasonably
noise-free reception, the receiver
is
designed to switch
automatically into mono. But if you disagree with the factory
setting of this stereo switching threshold, or if varying
recep-
tion
conditions
cause
the
tuner
to
switch
in
and
out
of
stereo,
or
if the signal is strong but severely distorted because of
multipath interference, you can lock the tuner
in
mono by
pressing the ENTER button, holding
it
in for at least two
seconds.
Under
adverse
conditions
mono
reception
will
normally be quieter and more distortion-free than stereo.
(Of course using the ENTER/MONO button to switch
into mono also engages the ENTER mode. The ENTER
mode will automatically disengage within ten seconds. Do
not press any of the station pre-sets during that interval:
if
you do, the currently-tuned frequency will be programmed
into that pre-se!.)
The
ENTER/MONO button switches only the
FM
tuner
into mono. The Phono, Aux, and
Tape
inputs are unaffected.
If you re-tune to a different frequency,
or
switch to a
different input and then back to
FM
, or turn the receiver off
and later turn it on again, the tuner automatically returns
to
its
normal
operating
mode
in
which
stereo
or
mono
reception
is selected automatically.
You
can also return it
to
automatic
mode by again depressing the
ENTER/MONO button for at
least two seconds.
FAST
SCAN. The ENTER/MONO button also serves as
an "accelerator" for the
Up
/Down Tuning rocker. If you press
both the
ENTER/MONO button and the TUNING rocker, the
tuner
will scan up
or
down
in
frequency approximately five
times faster than normal, moving through the entire FM
tuning band in a few seconds. The usual caution applies,
however: if you press any of the station pre-sets within ten
seconds after pressing ENTER, you
will re-program that
pre-set-unless
you first disengage the ENTER mode by
using the
TUNING rocker in its normal slow-scan mode.
14.
TUNING DISPLAY. The display shows the broad-
cast frequency to which the receiver
is
tuned. (When you
select
the AUX
or
PHONO input the display is turned oft.) On
the FM band the fifth digit will be either a
or
5 since tuning
occurs
in
increments of 0.05 MHz. The decimal point in the
display blinks to indicate off-center tuning. (See paragraph
12.
UP/DOWN TUNING)
15.
FM
STEREO BEACON. This
red
LED illuminates
when a stereo
FM
broadcast
is
being received and decoded
by
the
receiver's
mulliplex
decoder
circuit.
If
a
station
is
broadcasting in mono, or
if
a stereo broadcast signal
is
too
weak for reasonably noise-free reception in stereo, then the
receiver 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 illuminates
whenever
the
receiver
is
turned
on
.
A
Note
on
Overload Protection. Because the NAD
7125
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 wilh 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.
But if you overdrive the receiver continuously rather
than only on brief musical peaks, the output transistors may
overhea!. 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
.
If this occurs, you should examine
whethe'
a oattern
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 4
OHMS.
You
may be
combining maximum bass boost with high volume settings.
Or
you may simply be playing Ihe music at continuously
high power levels that demand a larger amplilier.
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