User manual
Amplifier
Status
Display
Window:
The status
display window highlights
the operating
conditions
of the DCM500.
Please
refer
to Figwe #1
on the back
page
of this
instruction
sheet with numerical
reference
as follows:
High Temperature:
firis
red LED
glows
if
the fan has failed
and the amplifio
has
been shut down
by its'
temperature
control
circuity. If
this LED is
glowing
and the fans
have not failed, it
means
that
the amplifier is
operating in
an
ambient
environment
that it naturally
too hot for
fan
cooling
to make
any difference
to the temperature
of
the amplifier.
PoWef: This
LED
glows
green
if AC
power
is
switched
on to the DCM500.
Note
that
this
LED
does not indicate
the
pres€nce
ofa DC
supply
voltage
lUlains
Failure: The LED
glows
red if
there is
a failure in
the AC mains
power
supply. However,
this
LED
will
only
glow
if
there is a DC
supply
voltage
present.
If no DC
supply voltage
is
present
then this LED
will not
glow.
Output
Level
VU lleter: A 10
segment LED
W
meter
is
provided
to
give
an indication
of the
output
signal level
of
the
DCM500
from -25
to
+3
dB. For
normal
operation
the LED's
should oscillate in
and
out of the red zone.
If the
LED's
in
the red
zone
are lit
continually,
the,n the
output level
control
(or
the level
of the input
signal to the
DCM500)
should
be
adjusted
to reduce
the output level.
Too
much
output level
can cause
distortion and
possible
damage
to the connected
speaker
qystem.
Rear
Panel
Connections
Please
refer
to Figure
#2
on the
back
page
of these
instructions
with numerical
references
as follows:
3
pin
lEC,
AC
mains
power
inlet. The
operating voltage
is 240
VAC
@
50llzor
l t0 vtc
@
60 rIz.
The
AC
power
voltage level
is
not
externally
user
selectable
but
is
ftctory
pre-set (via
transformo
selection).
The inl* is
equipped
with
an inbuilt
AC
fuse holder
fitted
with
a l0 Amp
slow blow
fuse
plus
one spare
fuse. Power
consumption
is
800
VA.
Please
ensure
that
the mains
power
cord is
disconnected
before
attempting
to check
or replace
this fuse.
Output
terminal
strip . Reading
from
left
to right
these connections
are as follows:
Common
for
low impedance
4
Ohms
Common
for
constant
voltage
systems
70 volts
100
volts
24
VDC
power
connectio[.
The left
side red
post
is
the
+
(positive)
terminal
while the right
side
black
posr
is
the
-
(negative)
terminal.
The DC
current
drain is
30 Amps, maximum
at full
power.
This
socket
also
provides
trickle
charge
to
a
DC
battery
supply
(if
connected)
when the
DCM500
is
operated from AC
mains
power.
The
level
of
trickle charge is
30b
me"
maximum.
Twin
DC
low
voltage,
fuse
receptacles.
Access the
DC tuses
is by
turning
the cap
half a turn
count€r-
clockwisewith
a screwdriver.
The
value
of the
fuses is 35 Amps.
Pleasc
ensure
that the AC
powerswitch
is in
the.ofr
position
and that
the
mains
power
cord is
disconnected
before
attenpting
to
check or
replace
this frrse
lnput
(& parallel_output)
XLR
signal
connectiolr.
The input
to
the DCM500
is
ransformer
balanced
@
10K
ohms. The
pin
configuration
of both
sockets
is
as
follows:
pin
#l-earth;
pin
#2-active (high,
+);
pin
#3-active
(lol",
-j.
The
output
socket is
to
allow the
original input
signal to
be
fed
on to
another
amplifier.
As these
trvo sockets
are wired
in
passive
parallel,
the
failure
of any
one
amplifier
will not
affect
the sigrral
flowing
through
that
amplifier
to anotho
amplifier.