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SERVICE INFORMATION ACM604 MIXER AMPLIFIER CONTENTS: OPERATION MANUAL SCHEMATIC DIAGRAMS Australian Monitor 1 Clyde Street, Silverwater NSW 2128 Australia +61 2 9647 1411 www.australianmonitor.com.au ACM604 4 x 60w Mixer Amplifier Operating Manual ACM604, 4 x 60 Watt Mixer Amplifier Product Description The ACM604 is a 4 x 60 watt mixer amplifier designed for commercial installations. It features 4 independent 60 watt mixer 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. Front Panel Features Input Level Controls The front panel is split into 4 sections, one for each mixer amplifier. The level controls for each amplifier are labelled MicLine 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 level of 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 boost at 10kHz. Generally, a small increase of the treble control makes a system sound ‘brighter’. If no treble cut or boost 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 will illuminate. 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. 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. 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 disconnected before attempting to check or replace this fuse. Power consumption is 400 watts (max). Mic/Line Input Terminal Strip Located on the top half of the rear panel are the input connections for 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 Located on the right side of each input terminal strip is a two position screw terminal block for 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. The various outputs are marked as follows: COM 8 Common or “-” for low impedance speaker loads (8 ohms). Positive “+” for 8 ohm speaker loads (use with common) COM 70 100 Common or “-” for 70v or 100v speaker loads (maximum load of 160 ohms at 100v) Positive “+” for 70v line speaker loads (use with common) 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 The ACM604 includes a VOX muting circuit which is independent for each amplifier. 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 with muting enabled (jumper towards the front panel of the amplifier). To disable 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 An optional Tone Generator/Vox Relay card is available for the ACM604. Each card suits one amplifier within the 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. Important Safety Information 1. Save the carton and packing material even if the equipment has arrived in good condition. Should you ever need to ship the unit, use only the original factory packing. 2. Read all documentation before operating your equipment. Retain all documentation for future reference. 3. Follow all instructions printed on unit chassis for proper operation. 4. Do not spill water or other liquids into or on the unit, or operate the unit while standing in liquid. 5. Make sure power outlets conform to the power requirements 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 receptacles, 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. Mains voltage must be correct and the same as that printed on the rear of the unit. Damage caused by connection to improper AC voltage is not covered by any warranty. 9. Have gain controls on amplifiers turned down during power-up to prevent speaker damage if there are high signal levels at the inputs. 10. Power down & disconnect units from mains voltage before making connections. 11. Never hold a power switch in the “ON” position if it won’t stay there itself! 12. Do not use the unit near stoves, heat registers, radiators, or other heat producing devices. 13. Do not block fan intake or exhaust ports. 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 completely enclosed rack. If the unit is used in an extremely dusty or smoky environment, the unit should be periodically “blown free” of foreign matter. 14. Do not remove the cover. Removing the cover will expose you to potentially dangerous voltages. There are no user serviceable parts inside. 15. Do not drive the inputs with a signal level greater than that required to drive equipment to full output. 16. Do not connect the inputs / outputs of amplifiers 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. Do not run the output of any amplifier channel back into another channel’s input. Do not parallel- or series-connect an amplifier output with any other amplifier output. Audio Telex Communications Pty Ltd is not responsible for damage to loudspeakers for any reason. 18. Do not ground any red (“hot”) terminal. Never connect a “hot” (red) output to ground or to another “hot” (red) output! 19. Non-use periods. The power cord of equipment should be unplugged from the outlet when left unused for a long period of time. 20. Service Information Equipment should be serviced 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 appear to operate normally, or exhibits a marked change in performance E. The equipment has been dropped, or the enclosure damaged. 1 2 3 4 5 6 8 7 C4 100P 15VDC SW1/1 X1 1 2 C1 4u7 R1 220K 22K R2 680R C24 IC1A 3 D D3 R5 C2 4u7 R3 220K C5 4u7 C26 C27 .1u .1u 47u D X2/1 +VCC R4 680R GND SW1/2 R6 R7 4K7 C6 47u MASTER CONROL 22K R8 4K7 C3 AG 9VDC AG 100P CH 3 SW1/3 CH 2 CH 1 R16 10K C20 4u7 GND DC MUTE R17 1M TONE GENERATOR MUTE JP1 R32 100K R28 2K2 IC1B D1 C R31 120K C21 47u C X3/1 R27 10K C9 100P SW2/1 R12 4 5 C12 4u7 R18 220K 22K R15 680R IC2A 6 C11 4u7 R14 220K R13 680R SW2/2 R11 R10 4K7 B C8 4u7 C7 47u 22K R9 4K7 C10 AG B 100P SW2/3 C15 100P SW3/1 15VDC R22 7 8 C18 4u7 R26 220K 22K R25 680R IC2B 9 C17 4u7 R24 220K R29 2K2 R23 680R D2 SW3/2 R21 R20 4K7 C13 47u A C14 4u7 22K R19 4K7 C16 C22 47u R30 27K R33 2K2 C19 4u7 100P A SW3/3 C23 47u Title Size 10 A3 11 Date: File: 1 2 3 4 5 6 ACM604 MIC INPUT CD6258-1 Number 16-Oct-2002 Sheet of C:\Protel Files\CDTRAX\CD6258-1.DDB Drawn By: 7 Revision 1 1 RS 8 1 2 3 4 5 6 IC3 LM78L05 IC2 LM78L09 8 7 R8 10R 9VDC C3 47u C4 47u C1 47u D VDD 5VDC D C12 4u7 C11 .1u D5 R18 10K X1 R2 220R 47u D1 X2/1 LM358 IC4A D2 C GND 1 2 IC1 16C54 18 R7 17 3 16 4 15 5 14 EVAC 2 6 13 BELL 3 7 12 ALERT 4 8 11 PRE AN 5 9 10 1 1K8 C18 R3 1M 22P R6 10K C21 R4 100R R15 100K C7 .47u TONE OUT R12 2K7 9VDC IC5 LM358 IC4B 22P R5 8K2 D3 R10 18K C8 .47u 100K R9 GND R17 10K V1 R14 22K R13 4K7 C6 15VDC MUTE D4 XT1 100u B 47K 4VDC RN1A 10K RN1B 10K RN1D 10K C RN1C 10K C5 R1 R11 10K C2 .1u 9VDC B R20 100R COM 9 NO 10 NC 11 RY1 D6 R23 10K IC6 V3 BC546 C57 100u 2V7 R16 4K7 D7 LM741 R22 10K R19 10K C9 .1u 22K R21 C10 .1u A A Title Size A3 Date: File: 1 2 3 4 5 6 ACM604 TONE GEN CD6264-1 Number 16-Oct-2002 Sheet of C:\Protel Files\CDTRAX\CD6264-1.DDB Drawn By: 7 Revision 1 1 RS 8 1 2 3 4 5 6 8 7 D R17 47R D IC5 LM78L05 VDD SW1 ON PCB 6259 C17 47u V1 BC640 IC3 LM7812 R13 47R F3 T2 BR1 +30VDC 240VAC C18 100u FAN R14 10K C16 47u C15 47u C13 C21 15000u .1u VDD R11 10K C R15 1K IC6 VDD 12C509A 1 2 3 4 R12 10K/NTC C14 C20 15000u .1u D1 8V2 8 7 6 5 -30VDC C R18 1K VDD R16 330R IC4 SFH615-A2 F1 +30VDC F2 C9 TO OTHER AMPS 8 OHM IN PUT RN1A 10K T1 OT60 IC1 C1 220P C2 4u7 RN1B C5 220P LM3876 C3 100P .1u B IC2 R3 22K C12 R6 1K LM3876 R2 1K .1u 470u R10 22K 100V R1 1K R5 22K 70V C19 .1u COM B 470u -30VDC C11 C10 10K R7 22K R4 4R7 C4 .1u C6 100P R8 4R7 C7 .1u R9 1K C8 4u7 A A Title Size A3 Date: File: 1 2 3 4 5 6 ACM604 POWER AMP CD6251-1 Number 16-Oct-2002 Sheet of C:\Protel Files\CDTRAX\CD6251-1.DDB Drawn By: 7 Revision 1 1 RS 8 1 2 3 4 5 6 8 7 33VDC R36 10R 2W C15 470u C14 47u PRE AMP R26 .15R R34 47R 2W IC2 LM7818 R6 10K C10 47u D C13 47u R7 47K LM1458 IC1A INPUT R3 1K C1 .47u * C18 1n R4 3K3 R2 R5 100R 1M V11 BC546 D5 24 C11 100u 24VDC FAN D4 C5 120P R11 470R C8 0.1u R25 1K D V10 R10 1K BC640 R8 330R R24 1K D6 R12 10K V1 BD140 C2 .47u MUTE T1 COM R35 IC3 LM78L05 R27 1K TIP36C D1 R33 10K C V4 V3 TIP42C V2 BD139 V12 BD139 R31 4K7 C17 .1u R9 3K3 F1 5A/SB PW5 10R 70 R1 1K V9 BC639 C16 .1u V5 BD140 C COM 8OHM PW5 R13 1K C12 47u 100 C7 10n 10K R28 C3 .47u C6 10K R30 HI TEMP 100DEG 1 2 3 4 IC5 12C509A RX1 1K 8 7 6 5 R14 R29 10R 1M 18VDC R37 100R IC1B C9 .1u R32 120P MUTE INPUT D3 D2 R15 1K R20 330R R17 100R R16 3K3 1n C19 * C4 R23 1K V6 BD139 .47u 10K/NTC V7 TIP42C R18 47K LM1458 B 10K R19 B V8 TIP36C 3K3 R21 470R R22 *SOLDERED UNDER PCB A A Title Size A3 Date: File: 1 2 3 4 5 6 ACM 604 POWER AMP CD6285-1 C Number 14-Feb-2003 Sheet of C:\Protel Files\CDTRAX\CD6285-12.DDBDrawn By: 7 Revision 1 CKW 8 1