GB
times the Protection mode may be activated by
severe overheating, short-circuited speaker wiring, or
an internal fault.
If the Status light continues to glow red, switch the
Power OFF. When the output stage cools, relays will
automatically re-connect the speakers, and normal
operation can be resumed. In most cases a very
slight reduction in volume level will prevent further
interruptions.
If the protection relays interrupt the sound frequent-
ly, several possible causes should be considered: a
loose strand of wire causing a partial short-circuit
between speaker terminals, or continuous high-power
operation into a very low impedance in the Bridged
mode, or any obstruction of the free flow of air that is
needed to ventilate the amplifier and dissipate its
heat.
If the protection system interrupts the sound even
when the amplifier is cool, return the amplifier to your
NAD dealer for service. The protection relays may be
disengaging to protect your speakers from a circuit
fault, such as an improper DC voltage at the speaker
terminals.
3. BRIDGE MODE INDICATOR.
This amber LED glows when the Bridging switch is
set to ON (Mono).
4. SOFT CLIPPING INDICATOR.
This amber LED glows when the Soft Clipping
switch (on the rear panel) is ON.
NA
D
7
IN CASE OF DIFFICULTY:
A TROUBLE-SHOOTING GUIDE
PROBLEM CAUSE REMEDY
No sound.
Power not on. AC line cord unplugged, either at the wall The Protection mode has been engaged
or at the rear of the amplifier. to protect the amplifier from short-circuit
ed speaker wires or from overheating
caused by overdriving the amplifier into
a too low impedance To resume opera
tion, switch the Power OFF and allow
the amplifier to cool.
No sound in Speaker cable pulled loose. Check all connections, both at the
one channel. speakers and at the amplifier.
Input cable pulled loose or making poor Rotate RCA phono plugs in input sock-
contact in socket. ets to restore good contact.
Short-circuit or broken wire in a defective Wiggle cables, especially where they
input cable. enter plugs (at the preamp and at the
amplifier).
Weak bass; Loudspeakers wired out of phase. Swap connections at the back of ONE
poor stereo imaging. speaker.
Bridging switch set to ON (MONO) while Re-set the Bridging switch to OFF
speakers are connected for stereo (STEREO).
operation.
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