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ACMa5OP
Power
Amplifier
3
Ouditv
Endorse6
"ffiiH
Audio
Telex
Communications
Pty Ltd
ACN 00134S82
lncorporated
in NSW
NSW & ACT
149
Beaconsfield
Street
Private
Bag 149
Silverwater
NSW
2128
Australia
Ph 02 96/.71411
FaxO2 9648 3698
42 CommercialRoad
PO Box
871
Fortitude Valley
QLD
4006
Ph 07
38521312
Fax
07 32521237
221277
Middleborough
Road
Box
HillVlC 3128
PO Box 151
Blackburn
South VIC
3130
Ph 03 98907477
Fax 03 9890
7977
299
Fitzgerald
Street
West Perth
WA 6005
PO Box
404
North Perth
WA
6906
Ph 08
9228 4222
Fax 08
9228 4233
Electronic
Concepts
Pty Ltd
76 George
Street
Thebarton
SA 5031
PO Box
7034 Hutt
Street
Adelaide
SA 5000
Ph 08
82349444
Fax 08
823494/.1
K W McCulloch
Pty Ltd
54a Albert Road
MoonahTAS
7009
Ph 03
62286373
Fax
03 6278 1063
Unit B, 11 Piermark
Drive
PO
Box 512
Albany
NZ 1331
Ph 09 4159426
Fax
09 415 98il
ACM250P
Power
Amplifier
Product
Description
The ACM250P
is
a 250 watt
power
amplifier
with
outputs for 4
ohms, 70 and 100
volt line. It
may be
desk or rack mounted
but
comes standard
as self standing
with rubber
feet. The
ACM250P features
a flat
screwdriver
accessible
gain
control on the
rear
panel.
The
factory
setting for the
front
panel gain
control
is I volt
RMS.
Front Panel
[[UDlOIirr$r
ACM25OP
o
I
POWef
BUttOn:
This
switch controls
the switching
of AC
power
to
the amplifier.
Rocking
this switch turns
the AC
power
to the
amplifrer
on and
off. When
in the on
position,
the red neon
in the
body of the switch
will
glow.
Protect
LED: A feature
of
the ACM250P
is high
temperature
protection.
In most
applications,
the internal
cooling fan
will most
probably
never
switch on.
When used
with demanding
speaker
loads
or in difficult
operating
environments,
the fan may
regularly
switch
on to
cool the amp
down and then
switch
offagain. This
switching
on and
switching
offis
quite
normal.
The "Protect"
function
is
there to
protect
the
amplifier from
a high
temperature
problems
which
would
only occur
if the fan
stopped working
or
became
clogged
up. In this
very rare
occurance,
the amplifier
will shut
down and the
protect
LED
will illuminate.
The
amplifier
will
automatically
restart
once it's internal
temperature
has
fallen within
"safe" limits. If the
protect
LED
illuminates, it
is best
to switch
the amplifier
off, let it
cool down
and then try
it again. If the
protect
LED
illuminates
again,
please
contact either Audio
Telex
or the
company
who supplied
or installed
the equipment.
Rear Panel
+c-l
o:,Iy,r'
oo
AC FUSE
6A 58
llr:EimEffii
lvftrorru02l
UXUFACTURO WAUOIO TEg COIIUNICANOXS N lTD
SYONil UATM
3 Pin IEC
Mains Power lnlet
The operating voltage is 240 VAC
@
50 Hz or I l0 VAC
@
60
Hz
(special
order). The AC
power
voltage level is not
extemally
user adjustable
but
is
factory
pre-set.
The inlet is
equipped with an inbuilt AC fuse holder
fitted
with
a 6 amp fuse
plus
a spare found within
the holder. Power
consumption is 400VA.
I
Please
ensure that the mains
power
cord
is disconnected
before attempting
to check
or replace this fuse.
Direct
Output
Terminal
Strip: These
screw terminals
allow access to the
direct outputs of the amplifier.
Reading from
left
to right
the terminals
are-
.
Low Impedance
Common
.
4
Ohms
I
Spare
r
Constant Voltage
Common
.
70 Volt Line
'
100
Volt Line
TWin
DG fuse receptacles:
Access the DC
fuses is by tuming
the cap half
a tum counter-clockwise with
a screwdriver.
The value
of the fuses is 10
Amps slow
blow. I Please
ensure that the AC
power
switch
is in the
'oI?
position
and that
the
mains
power
cord
is
disconnected
before
attempting to
check or replace this fuse.
Signal
lnpUt
SOCketS:
Signal input
to the ACM250P
is via a 3
pin
XLR
socket
and is rated
at
lOK
Ohms and is
active
balanced. The two
sockets
are
provided
for
bridged in/out
connection. Pin
connections
are Pin l:Earth.
Pin 2=Active Positive (+).
Pin
3:Active Negative
(-).
Gain
COntfOl LeVel:
A recessed
(screwdriver
adjustable)
gain
control is located
on the back
panel.
Tuming
the
control
clockwise
will increase
the
output of the ACM250P
towards it's
maximum output
level while
turning the control
counter-clockwise
will
decrease the
output level. Adjust
this control
for the desired
output level depending
on the level
of the input signal
(from
a mixer
or other signal source). The
factory
default setting for
this control
is such that a I volt input
will
give
a
100
volt output.
Fuse Sizes
Mains 240
VAC:
6 Amperes Slow
Blow
DC: Z x 10
Amperes
Slow Blow
Notes
There
are no user
adjustable controls
inside the
amplifier
so the cover should
only be removed
by
qualified
service
personnel.
In all
cases
the mains
power
lead
should
be disconnected
before the
cover
is
removed.
1 2 3 4 5 6 78
A
B
C
D
8
7654321
D
C
B
A
Title
Number RevisionSize
A3
Date: 16-Oct-2002 Sheet of
File: C:\Protel Files\CDTRAX\CD6241-1.DDB Drawn By:
IC1
LM741
R1
10K
R2
10K
R3
10K
R4
10R
R5
10K
C1
100P
C2
4u7
C3
4u7
C4
4u7
R6
50K
R7
1K
C5
100P
C6
.1u
1
2
3
4
5
6
7
8
9 10
11
12
13
14
15
16
17
18
IC2
16C54
C7
22P
C8
22P
XT1 R8
1M
R9
560R
R10
1K
R11
1K
V1
BD139
V2
BC546
V3
BC546
R12
100R
C9
4u7
R13
4K7
D1
20V
C10
100u
C11
100u
R14
4K7
R15
4K7
C12
4u7
C13
47u
R16
4K7
R17
10K
R18
1K
IC3
78L05
R19
10R
C14
47u
C15
4u7
45VDC
INPUT
12
3
X1/1
GND
FAN
INPUT
1/2 VCC
GND
19V VCC
FAN PTC
HI TEMP PTC
NC
HI TEMP LED
6X 10K
ACM250-P INPUT
CD6241-1
11
RS
1 2 3 4 5 6 78
A
B
C
D
8
7654321
D
C
B
A
Title
Number RevisionSize
A3
Date: 16-Oct-2002 Sheet of
File: C:\Protel Files\CDTRAX\CD6240-11.DDBDrawn By:
R42
1K
R37
1K
R36
100K
C7
4u7
D1
R35
100R
R32
1K5
R28
.1R
R27
.1R
C10
.1u
C9
.1u
D7
R1
68K
R2
68K
R3
10K
R4
10K
R5
680R
R6
680R
R7
100R
R8
100R
R9
100R
R10
100R
R13
1K
R14
1K
R15
150R
R16
150R
R17
1K
R18
1K
R19
470R
R20
470R
R21
10R
R22
10R
R23
470R
T3A
T3B
V1
V2
V3
V4
V10
V15
V11
V16
V5
V6
P1
500R
D4
R39
150R
C5
820P
R50
.22
R51
.22
C1
2u2
C2
2u2
R55
.22
R56
.22
R38
150R
D5
P2
500R
C6
820P
IC2
78L05
T2
V7
BC640
D6
T1
S1
C1. C2.
D8
D9
F3
4A SB
F2
10A SB
N1
R31
1K
IC1A
LM833
IC1B
LM833
R11
1K
R12
1K
R24
10K
R25
10K
R26
10K
R40
10K
R41
47K
R43
10K
C3
.47
C4
100P
C11
100P
V8
BD139
R45
4K7
D15
12V
V9
BC546
C13
2u2
C14
47u
R46
4K7
R47
2K2
D16
4V7
R48
70DEG
R49
100DEG
BR1
F1
10A SB
IC3
7818
C8
4u7
C15
100u
R44
470R
D2
C12
.47u
1/2 VCC
CD6240-1
ACM250 POWER AMP
GND
INPUT
X3/1
X1/1
4 OHM
X2/9
X2/7
XT/5
X2/4
X2/2
X2/1
X2/3
X2/8
X2/6
240VAC
COM
COM
70VAC
100VAC
11
RS
FAN
TEMP FAN
TEMP CUTOUT
+45VDC
+45VDC
NC
FAN
V10-V19=TIP35C
R50-59=.22R
PLEASE NOTE:
BC639
BC639
1 2 3 4 5 6 78
A
B
C
D
8
7654321
D
C
B
A
Title
Number RevisionSize
A3
Date: 14-Apr-2004 Sheet of
File: C:\PDF CCT\CD6240-12.DDB Drawn By:
C12
.47u
D2
R44
470R
C15
100u
C8
4u7
IC3
7818
F1
10A SB
BR1
R49
100DEG
R48
70DEG
D16
4V7
R47
2K2
R46
4K7
C14
47u
C13
2u2
V9
BC546
D15
12V
R45
4K7
V8
BD139
C11
100P
C4
100P
C3
.47
R43
10K
R41
47K
R40
10K
R26
10K
R25
10K
R24
10K
R12
1K
R11
1K
IC1B
LM833
IC1A
LM833
R31
1K
N1
F2
10A SB
F3
6.3A-SB
D9
D8
C2.C1.
S1
T1
D6
V7
BC640
T2
IC2
78L05
C6
820P
P2
500R
D5
R38
150R
R56
.22
R55
.22
C2
2u2
C1
2u2
R51
.22
R50
.22
C5
820P
R39
150R
D4
P1
500R
V6
V5
V16
V11
V15
V10
V4
V3
V2
V1
T3B
T3A
R23
470R
R22
10R
R21
10R
R20
470R
R19
470R
R18
1K
R17
1K
R16
150R
R15
150R
R14
1K
R13
1K
R10
100R
R9
100R
R8
100R
R7
100R
R6
680R
R5
680R
R4
10K
R3
10K
R2
68K
R1
68K
D7
C9
.1u
C10
.1u
R27
.1R
R28
.1R
R32
1K2
R35
100R
D1
C7
4u7
R36
100K
R37
1K
R42
1K
A
BC639
BC639
PLEASE NOTE:
R50-59=.22R
V10-V19=TIP35C
FAN
NC
+45VDC
+45VDC
TEMP CUTOUT
TEMP FAN
FAN
SBG
11
100VAC
70VAC
COM
COM
240VAC
X2/6
X2/8
X2/3
X2/1
X2/2
X2/4
XT/5
X2/7
X2/9
4 OHM
X1/1
X3/1
INPUT
GND
ACM250 POWER AMP
CD6240-1
1/2 VCC
-
1
-
2
-
3
-
4
-
5
-
6
-
7
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