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AUSTRALIAN MONITOR AM3002 にも： 仕様 (2 ページ)
ページを印刷するControls
& Connectors
7
Front
Panel
Figure
t
shows
the panel layout
of the AN30O2.
The
funclions
ofthe controls
and indicators
are
as
follows:
l.
Attenuator
Level
controlforyouramplifier
is
provided
by
a
21
position detented
potentiomelerand
indicates
gain
reduction
in
decibels from
the
0
dB
position
(maximum
gain,
no
attenualion).
2.
VU Meter
-
Status
Indicator
Level Indication
(see
inselt
-
l)
Each channel
featuresa variable
1
0segmentdisplay
showing
lhe actual power/volume level available
before
clipping (taking
mains supply
and load
duty
into
account).
The
display
is
colourcoded,
and
calibrated
in
3dB
increments.
The
10
LEDS
are:
Green
=
-27dBlo-21d8
Yellow
=
-18d8
to
-6dB
Red
=
-3dB
andthetwo
LEDS
indicating
the
clipping point.
Power
On
Indication
Two Green
LEDS
either side
of
the mains switch
(above the "ON" legend)
are used to
indicate
that
the unit
is
on.
The
first
Green LED
indicatesthe
15
Volt preamp supply
is
present (the len
hand
side
display
shows -15V,
andthe
right hand
sideshows
the +15V).
The next LED outwards
is
also
a
supply
indicator
and
shows
that the Positive High Current
Outpul
Rail
is
available
to
the
corresponding channel.
NOTE:
Theamplifieris
notdamaged
by
running
into
clipping,
but
speakers may
be.
To
maximisethe life
ofyourspeekers,
try
lo
keep
clipping infrequent.
3. Power Switch
Pressthe switch DOWN for
power ON
and
!,Pfor
power
OFF. At start-up (turn-on) the
input
to
the
amplifier
is
muted
by 30dB
for approximately two
seconds.
4. Thennal Indicator
When switching
the
amplifieron, this
red
LED
will
flash momentarily, indicating conect operation
of
the Mains ln-Rush Currenl
Suppression circuit.
Aft
erestablishment
of lnrush
Currenl Suppression
circuil the LED will extinguish. This LED will not
illuminate during
normal
use
of
the
amplifier.
ln
the advent of
a
thermal overload this LED will
illuminate
red indicating that the
internaloperating
temperature ofone
or
both
amplifierchannels has
exceeded
a
safe
levelofoperation andthe
amplifier
will
be
shutdown.
The
fanswill continueto
run
and
oncethe amplifierhascooled
down
sufliciently,
the
amplifierwill
s{art
up
automatically providing lnrush
Current Suppression
and input
signal muting until
establishment
of the amplifier afler which it will
retum to
normaloperating mode.
NOTE:You
should always
ensurethatthe
fan
grille
is
kept clean
and
free from the build
up
ofdust
and
lint.
Thiswill
ensure
longeroperation
of
youramplifier
and
reduce
the possibility of
it
prematurely going
intothermal shutdown mode.
5.
Fault Indicator
ThisamberLEDwill
illuminatewhen
a
fauttcondition
exists-
The fault
detection circuit monitors
the
d
ifference
between drive and
output
in
youramplifier.
lfyou
have
a
short circuit
on
the
speakeroutput (or
a
blown
negative
railfuse)the LEDwillflash brightly
in sync
with the programme. This LED will also
flashwith programme peeksfor
gross
overloads
or
if
lhe load
is
2
ohms or
less.
The circuit
hastwo stages
of
operation:
1 .
ltwillprovide indication
(e.9.
grossoverload) but
does not
affect the
input
signal
(a
faint flash).
2. lt will indicate and mute the input signal (e.9.
shorted
outpul) (brightly flashing or permanently
on).
ln
the
advent ofa
failurethe
display
panelrevertsto
a
faull display to assist
in
diagnosis
of
the
fault.
-
The VU
meterwill light
up
fully
and
the
Positive
Output Rail LED
will
extinguish
if the
positive
supply
rail
is not
available
(check rear
rail
breaker).
- The fault Led will glow brightly if the Negative
output
Railis
nol
available (check
rea
r
ra il
breaker).
-
Failure
of the
pre-amp supply
will
cause the
amplifier
to
be muted and indicator
LEDS
to
be
extinguished
Australian Mon'rtor
/tu