AUSTRALIAN MONITOR ACM604 Operating and installation instructions

Australian Monitor
1 Clyde Street, Silverwater NSW 2128 Australia
[phone]
www.australianmonitor.com.au
SERVICE INFORMATION
ACM604
MIXER AMPLIFIER
CONTENTS:
OPERATION MANUAL
SCHEMATIC DIAGRAMS

ACM604
4 x 60w Mixer Amplifier
Operating Manual

ProductDescription
TheACM604isa4x60wattmixeramplifierdesignedforcommercialinstallations.Itfeatures4independent60wattmixer
amplifiers within the one 2 rack unit chassis. Each amplifier features 3 balanced microphone/line input channels and
outputs for either low impedance (8 ohm) or 70v/100v line speaker systems. A host of unique features including VOX
muting, VCA master level control and optional tone generator/VOX relay cards make the ACM604 a very flexible
amplifier. The unit can be mounted in a standard 19” equipment rack (rack ears supplied) or it can be used on a shelf or
table.
ACM604, 4 x 60 Watt Mixer Amplifier
Front Panel Features
Input Level Controls
Thefront panel is splitinto 4 sections, onefor each mixer amplifier.The level controls foreach amplifier are labelledMic-
Line 1 through to Mic-Line 3. These level controls are used to set up a suitable “mix” of all the various input sources
connected to each amplifier, for example microphones, CD players, cassette decks. If a master level control is desired per
amplifier, an external 500-1K ohm pot can be connected (per amplifier) to the rear panel for remote control of the master
levelof each amplifier.
Bass Control
Each amplifier within the ACM604 includes a recessed, screwdriver adjustable 2 band equalisation system. The Bass
control allows the user to increase or decrease the amount of bass in the system. The control allows for 12dB of cut or
boost at 100Hz. If no bass cut or boost is required, the control should be left in the centre position.
Treble Control
Each amplifier within the ACM604 includes a recessed, screwdriver adjustable 2 band equalisation system. The Treble
control allows the user to increase or decrease the amount of treble in the system. The control allows for 9dB of cut or
boostat 10kHz. Generally,a small increase of the treble control makes a system sound ‘brighter’. If notreble cut orboost
is required, the control should be left in the centre position.
VCA Master Control
For applications requiring remote level control, provision has been made on the rear panel of the ACM604 to connect an
external 500-1K ohm pot for remote control of the master level of each amplifier.
Power Switch & “On” LED
The black rocker switch on the right hand side of the front panel is used to switch the amplifier on and off. The ‘up’
position is on. When the amplifier is connected to an appropriate AC power source and is switched on, the blue on LED
willilluminate.
Signal LED’s
The four green “Signal” LED’s located next to the On LED indicates that the ACM604 is passing audio. One LED is
provided per amplifier. The signal LED is a simple method to trouble-shoot installations especially in multi-amplifier
projects.

Rear Panel Features
AC Power Inlet
The 3 pin IEC power inlet is located on the bottom left of the rear panel and accepts a standard mains power lead fitted
with an IEC connector. Before plugging in a power lead, please check the rear panel of the amplifier to ensure that the
voltage label shows the correct AC operating voltage for your part of the world. The inlet is equipped with an in-built AC
fuse holder fitted with a 5 Amp slow blow fuse plus a spare fuse. Please ensure that the mains power cord is discon-
nectedbeforeattempting tocheckor replace thisfuse.Power consumption is400 watts (max).
Mic/Line Input Terminal Strip
Locatedon the tophalf of therear panel arethe input connectionsfor all 4 amplifiers. Each amplifier will accept balanced
microphone or line inputs (selectable via an internal dip switch). Additionally, a remote pot can be connected to each
amplifier for external control of the master level.
The rear panel is split into four sections, one for each amplifier. Looking at the back panel and reading from left to right
the amplifiers are 4, 3, 2 and 1. In other words, the input and output section is directly behind the relevant front panel
controls.
The inputs are labelled Ch1, Ch2 and Ch3. All are balanced with the connection reading left to right as “Ground, +
positive, - negative”. Each input can be switched to be either mic or line level via a dip switch behind each input and
accessible through the top lid. Additionally, phantom power (+18v DC) is selectable per input. The dip switch settings
are: Balanced Mic Level - 1 and 2 On
Balanced Line Level - 1 and 2 Off
Phantom Power (+18v) - 3 ‘On’ to enable phantom power or ‘Off’ to disable phantom power
VCA Remote Master Level Control
Locatedon the rightside of each input terminal strip is a two positionscrew terminal blockfor an external pot. For remote
master level control, an external 500-1K ohm pot can be connected per amplifier.
Speaker Output Terminal Strip
Located on the bottom half of the back panel is the speaker output terminal strip. Four separate speaker output terminal
strips are provided, one for each amplifier. Looking at the back panel and reading from left to right the amplifiers are 4, 3,
2 and 1. In other words, the speaker output section is directly behind the relevant front panel controls.
Each of the four amplifiers in the ACM604 can work with 8 ohm and/or 70/100 volt line speakers systems.
Rack Mounting
The ACM604 is supplied with rack ears attached to allow mounting within a standard 19” equipment rack. As is the case
with almost all audio products, adequate ventilation and air flow is required. When installing multiple ACM amplifiers
within the one rack, it is recommended that at least 1 rack unit of ventilation space is left between every two amplifiers.
For table or shelf mounting, the rack ears can be removed using a screwdriver. Once the rack ears are removed, please
reinstall the screws.

The various outputs are marked as follows:
COM Common or “-” for low impedance speaker loads (8 ohms).
8Positive “+” for 8 ohm speaker loads (use with common)
COM Common or “-” for 70v or 100v speaker loads (maximum load of 160 ohms at 100v)
70 Positive “+” for 70v line speaker loads (use with common)
100 Positive “+” for 100v line speaker loads (use with common)
Please ensure that the correct “Common” is used. Low impedance and 70/100v loads can be used simultaneously but
please pay careful attention to the overall speaker load. When used individually, the low impedance load should be 8
ohms or higher while the 100v line load should not fall below 160 ohms. When both outputs are used simultaneously,
ensure that neither output is loaded to maximum.
VOX Muting
TheACM604 includes a VOX muting circuit which is independent for eachamplifier. The unit is factory set so that input
1 of each amplifier has VOX priority over inputs 2 and 3 for that amplifier. Basically, when signal is present on input 1,
audio from inputs 2 and 3 is muted. As mentioned, each amplifier is totally independent so the VOX circuit from one
amplifier does not affect any of the other amplifiers.
Muting can be defeated per amplifier via an internal jumper labelled JP2 (located on the top board behind inputs 1 and
2.The ACM604 is shipped withmuting enabled (jumper towards thefrontpanel of the amplifier).Todisable VOX muting
per amplifier, simply move the relevant jumper (from amplifiers 1, 2, 3 or 4) so that it is closest to the back panel.
Optional ATC5489 Tone Generator/Vox Relay Card
Anoptional Tone Generator/Vox Relaycard is availablefor the ACM604.Each card suitsone amplifier withinthe unit so
up to 4 cards can be installed. The card slots in between the input terminal strip and the output terminal strip on the rear
panel of the amplifier. Simply remove the two screws and blanking plate, slide in the ATC5489 and replace the screws.
The card provides a 4 tone generator module (Pre-Announce, Bell, Alert and Evacuate tones) per amplifier and also
provides a VOX triggered relay output per amplifier. Full installation and operation instructions are included with the
ATC5489.

1.Savethecartonandpackingmaterialeveniftheequip-
ment has arrived in good condition. Should you ever
need to ship the unit, use only the original factory pack-
ing.
2.Readalldocumentationbeforeoperatingyourequip-
ment.Retain all documentation for future reference.
3. Follow all instructions printed on unit chassis for
proper operation.
4.Donotspillwaterorotherliquidsinto orontheunit,
or operate the unit while standing in liquid.
5. Makesure poweroutlets conformto thepower re-
quirements listed on the back of the unit.
6. Do not use the unit if the electrical power cord is
frayed or broken. The power supply cords should be
routed so that they are not likely to be walked on or
pinched by items placed upon or against them, paying
particular attention to cords and plugs, convenience re-
ceptacles, and the point where they exit from the
appliance.
7. Always operate the unit with the AC ground wire
connected to the electrical system ground. Precautions
should be taken so that the means of grounding of a
piece of equipment is not defeated.
8.Mainsvoltage must becorrectand thesameas that
printed on the rear of the unit. Damage caused by
connection to improper AC voltage is not covered by
any warranty.
9.Havegaincontrolsonamplifiersturneddownduring
power-up to prevent speaker damage if there are high
signal levels at the inputs.
10.Powerdown&disconnectunitsfrommainsvoltage
beforemakingconnections.
11.Neverholda powerswitchinthe“ON”positionifit
won’tstaythereitself!
12.Donot usethe unitnear stoves,heat registers,ra-
diators,orotherheatproducingdevices.
13. Donotblock fanintake or exhaustports.Do not
operate equipment on a surface or in an environment
which may impede the normal flow of air around the
unit, such as a bed, rug, weathersheet, carpet, or com-
pletelyenclosedrack.Ifthe unit is used in an extremely
dusty or smoky environment, the unit should be peri-
odically “blown free” of foreign matter.
14. Donotremovethe cover.Removing the cover will
expose you to potentially dangerous voltages. There
are no user serviceable parts inside.
15.Donotdrivetheinputswithasignallevel greater
thanthatrequiredtodriveequipmenttofulloutput.
16. Donotconnectthe inputs /outputsofamplifiers
or consoles to any other voltage source, such as a
battery, mains source, or power supply, regardless of
whether the amplifier or console is turned on or off.
17. Donot run theoutput of anyamplifier channel
backintoanotherchannel’sinput.Donotparallel-or
series-connect an amplifier output with any other
amplifieroutput.
Audio Telex Communications Pty Ltd is not respon-
sible for damage to loudspeakers for any reason.
18. Donot groundany red (“hot”) terminal. Never
connecta“hot”(red)outputtogroundortoanother
“hot”(red)output!
19. Non-use periods. The power cord of equipment
should be unplugged from the outlet when left un-
used for a long period of time.
20.ServiceInformationEquipment should beserviced
by qualified service personnel when:
A. The power supply cord or the plug has been
damaged.
B. Objects have fallen, or liquid has been spilled into
the equipment
C. The equipment has been exposed to rain
D.The equipment does not appeartooperate normally,
or exhibits a marked change in performance
E. The equipment has been dropped, or the enclosure
damaged.
Important Safety Information

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Date: 16-Oct-2002 Sheet of
File: C:\Protel Files\CDTRAX\CD6258-1.DDB Drawn By:
C27
.1u
C26
.1u
R30
27K
R29
2K2
D3
C24
47u
C23
47u
C22
47u
C20
4u7
R27
10K
R16
10K
IC1B
R26
220K R25 680R
R24
220K R23 680R
C18
4u7
C17
4u7
C16 100P
C15
100P
C14
4u7
IC2B
R22
22K
R21
22K
SW3/1
SW3/2
SW3/3
C13
47u
R20
4K7 R19 4K7
R18
220K R15 680R
R14
220K R13 680R
C12
4u7
C11
4u7
C10 100P
C9
100P
C8
4u7
IC2A
R12
22K
R11
22K
SW2/1
SW2/2
SW2/3
C7
47u
R10
4K7 R9 4K7
R8
4K7
R7
4K7
C6
47u SW1/3
SW1/2
SW1/1
R6
22K
R5
22K
IC1A C5
4u7
C4
100P
C3 100P
C2
4u7
C1
4u7
R4
680R
R3
220K
R2
680R
R1
220K
R28
2K2 D1
R31
120K
R32
100K
C21
47u
D2
R33
2K2 C19 4u7
R17
1M
15VDC
MUTE
JP1
X3/1
X2/1
X1
GND
GND
11
10
9
8
7
6
5
4
DC MUTE
AG 9VDC
AG
CD6258-1
3
2
1
MASTER CONROL
CH 3
CH 2
CH 1
+VCC
TONE GENERATOR
AG
15VDC
11
RS
ACM604 MIC INPUT

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R22
10K
R21
22K
R16
4K7
IC6
LM741
R5
8K2
C5
47u
D4
1
2
3
4
5
6
7
8
910
11
12
13
14
15
16
17
18
IC1
16C54
IC4B
IC4A
V1
R1 1K8
R2 220R
R7 47K
R13
4K7
R10
18K
R3
1M
RN1A
10K
RN1B
10K
RN1C
10K
RN1D
10K
D1
D2
D3
C18 22P
C21 22P
XT1
R4
100R
C6
100u
IC5
R12
2K7
C7
.47u
R14
22K
C8
.47u
R17
10K
R6
10K
R11
10K
R18
10K
D5
R15
100K
V3
BC546
R19
10K
D7
R20
100R
D6
C9
.1u
RY1
IC2
LM78L09
IC3
LM78L05 R8 10R
R9
100K
C1
47u
C4
47u
C3
47u
C10
.1u
C2
.1u
C11
.1u
C12
4u7
C57
100u
ACM604 TONE GEN
9VDC
11
CD6264-1
11
10
9
X1
5
4
3
2
1
9VDC15VDC
X2/1
RS
TONE OUT
MUTE
VDD 5VDC
9VDC
LM358
LM358
4VDC
2V7
EVAC
BELL
ALERT
PRE AN
COM
NO
NC
GND
GND

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SW1 F3
VDD
VDD
VDD
VDD
D1
8V2
C20
15000u
C21
15000u
C18
100u
C17
47u
C16
47u C15 47u
C14
.1u
C13
.1u
C12
.1u
C11
.1u
C10
470u
C9
470u
F2
F1
BR1
T2
R18
1K
R17
47R
R16
330R
R15
1K
R14
10K
R13
47R
R11
10K
R12
10K/NTC
IC5
LM78L05
V1
BC640 IC3 LM7812
IC4
SFH615-A2
IC2
LM3876
R10
22K
RN1B
10K
R9
1K
R8
4R7
R7
22K
R6
1K
C8
4u7
C7
.1u
C6
100P
C5
220P
C4
.1u
C3
100P
C2
4u7
C1
220P
T1
OT60
R5
22K
R4
4R7
R3
22K
R2
1K
RN1A
10K
R1
1K
IC1
LM3876
FAN
RS
11
CD6251-1
ACM604 POWER AMP
ON PCB 6259
IC6
12C509A
240VAC
100V 70V COM
8 OHM
IN PUT
TO OTHER AMPS
8
7
6
54
3
2
1
-30VDC
+30VDC
-30VDC
+30VDC

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1n
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.1u
R29
10R
D6
R25
1K
R27
1K
V10
BC640
C5
120P
C6 120P
V12
BD139
D5
24
C7
10n
D4
D3
R16
3K3
R4
3K3
R1
1K
R2
1M
R6
10K
R7
47K
R5
100R
R9
3K3
R10
1K
R12
10K
R11
470R
R26
.15R
IC1A C1
.47u
C2
.47u
V2
BD139
V1
BD140
V3
TIP42C
V4
TIP36C
R3
1K
T1
R23
1K
V8
TIP36C
V7
TIP42C
V6
BD139
C3
.47u
C4
.47u
IC1B
R22
470R
R28
10K
R15
1K
R21
3K3
R17
100R
R18
47K
R19
10K
R14
1M
R13
1K V5
BD140
V9
BC639
R8
330R
R20
330R
R24
1K
D1
D2
F1
5A/SB
IC3
LM78L05
IC2
LM7818
R34
47R
C13
47u
C10
47u
R31
4K7
R33
10K
C11
100u
C12
47u
R30
10K
R32
10K/NTC
V11
BC546
R35
10R
R36
10R
C14
47u
C15
470u
C16
.1u
C17
.1u
R37
100R
C8
0.1u
RX1
1K
CKW 11
*
*
*SOLDERED UNDER PCB
33VDC
MUTE
LM1458
LM1458
INPUT
INPUT
PW5
COM
70
100
COM
8OHM
18VDC
ACM 604 POWER AMP
CD6285-1
1
2
3
45
6
7
8
12C509A
IC5
FAN
C
MUTE
HI TEMP
100DEG
PRE AMP
24VDC
2W 2W PW5