NAD 7125 Instructions For Installation And Operation Manual page 8

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.