AUSTRALIAN MONITOR AMC+120 Installation And Operation Manual
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AUSTRALIAN MONITOR AMC+120 Installation And Operation Manual

Mixer amplifier
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SERVICE INFORMATION

AMC+120
MIXER AMPLIFIER
CONTENTS:
OPERATION MANUAL
SCHEMATIC DIAGRAMS
COMPONENT OVERLAYS
TEST PROCEDURE
REPLACEMENT PARTS LIST
SERVICE BULLETIN
Australian Monitor
1 Clyde Street, Silverwater NSW 2128 Australia
+61 2 9647 1411
www.australianmonitor.com.au

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Summary of Contents for AUSTRALIAN MONITOR AMC+120

  • Page 1: Service Information

    SERVICE INFORMATION AMC+120 MIXER AMPLIFIER CONTENTS: OPERATION MANUAL SCHEMATIC DIAGRAMS COMPONENT OVERLAYS TEST PROCEDURE REPLACEMENT PARTS LIST SERVICE BULLETIN Australian Monitor 1 Clyde Street, Silverwater NSW 2128 Australia +61 2 9647 1411 www.australianmonitor.com.au...
  • Page 2 SERIES 30W/60W/120W/250W MIXER AMPLIFIERS INSTALLATION AND OPERATION MANUAL...

  • Page 3: Important Safety Information

    Do not parallel- or series-connect an amplifier output with any other amplifier output. Australian Monitor Inc is not 7. Always operate the unit with the AC ground wire connected to the responsible for damage to loudspeakers for any reason.

  • Page 4: Table Of Contents

    INTRODUCTION AND CONTENTS INTRODUCTION The Australian Monitor AMC series of amplifiers takes the heritage and reliability of our famous AMIS series amplifiers and integrates these features into low cost amplifiers for applications where reliability is everything, but the FRONT PANEL more elaborate features of our AMIS series are not required.

  • Page 5: Front Panel

    FRONT PANEL CH 1–4 These control the levels for each channel input. Bass There is 12dB of cut and boost at 100Hz. Treble There is 9dB of cut and boost at 10kHz. Master This controls the overall mixed output level. This LED indicates the unit is powered “on”.

  • Page 6: Rear Panel

    (LINE). 70V out is available on 115V models. 100V out is available on 230V/240V models. (Optional) Tone Module These terminals are for use with an optional tone module (not supplied). Use Australian Monitor ATC5488 module. Phantom Power 12V phantom power is available for condenser or electret microphones on the XLR input when this switch is pushed in.

  • Page 7: Installation

    INSTALLATION Mounting Direct Output When rack mounting, it is advisable to allow 1 rack space above and below the The output terminal strip accepts wire sizes from 16-22AWG amplifier. When multiple amplifiers are mounted in a rack, exhaust fans should (1.5mm2 –...

  • Page 8: Troubleshooting And Block Diagram

    120 AMC 250 only) Make sure the amplifier is well ventilated DC fuse(s) blown Refer product to local Australian Monitor dealer Remove signal (disconnect input) from channel 1 OR No sound from channels 2 and 3 Priority function is being used...

  • Page 9: Functional Notes And Internal Adjustments

    FUNCTIONAL NOTES AND INTERNAL ADjUSTMENTS PRIORITY Channel 1 will mute channels 2, 3 and 4. This will only occur when signal appears on channel 1, irrespective of the channel volume control. Priority can be disabled. (See below). The release time is approx. 3 secs and is NOT adjustable. The mute depth is approx. 40dB and is not adjustable. PAGE 8 SERIES INSTALLATION AND OPERATION MANUAL...

  • Page 10: Dimensions

    DIMENSIONS SERIES INSTALLATION AND OPERATION MANUAL PAGE 9...

  • Page 11: Specifications

    SPECIFICATIONS POWER OUTPUT (0.5%THD, 1kHZ) 120W 250W S/N RATIO > 75dBr > 75dBr > 80dBr >85dBr POWER BANDWIDTH (-3dB +1dB) 85Hz-15kHz 75Hz-15kHz 75Hz-15kHz 30Hz-20kHz FUSES MAINS (115V) 1.0A 3.15A 6.3A MAINS (230/240V) 0.5A 1.6A 3.15A 1.6A (x2) 10A (x2) OUTPUT REgULATION SIZE (WXHXD) 482 x 88 x 190mm 482 x 88 x 281mm...
  • Page 12 SPECIFICATIONS COMMON TO ALL MODELS THD (1kHz, -1dB) Better than 0.5% MIC INPUT SENSITIVITY 1mV @ 200ohm IMPEDANCE 1k3 ohm HEADROOM 77mV (37dB) AUX INPUT SENSITIVITY 0.5V+/@100kohm IMPEDANCE >200kohm HEADROOM > 15V (>30dB) TONE CONTROL BASS @ 100HZ +/- 12 dB TREBLE @ 10KHZ +/- 9 dB LINE OUT...
  • Page 13 AUSTRALIA AND NEW ZEALAND www.australianmonitor.com.au SYDNEY MELBOURNE BRISBANE ADELAIDE PERTH AUCKLAND (SA & NT SALES) (NSW & ACT SALES) (VIC & TAS SALES) (QLD SALES) (WA SALES) (NZ SALES) 1 Clyde Street 22/277 42 Commercial Road 31 Walsh Street 3/11 Howe Street 9C Piermark Drive Silverwater Middleborough Road...
  • Page 14 330K 330K 10/25 NP 470p 680R 10/25 NP XLR4 680R 10/25 NP IC2B XLR-FEMALE LM833 470p AUSTRALIAN MONITOR REVISION NOTE: DATE DRAWING No: SIL/16/0339 4.7u DESCRIPTION: AMC 120/60/30 MIC INPUT SW1A Added 4th channel & P/P 14/02/08 DATE: 2009-5-5 DRAWN BY:...
  • Page 15 BD139 TIP41C TIP35C TIP35C C1815 BIAS 1N4007 100R 100R Model Variations *** AMC+60 / AMC+120 D4, D6 AMC60 - N/C AMC120 - 6A04 T13, T14 AMC60 - N/C AMC120 - TIP35C R37, R38 AMC60 - N/C AMC120 - 0.39R/5W AMC60 - N/C HRC 120W-2A/60W-1.6A...
  • Page 16 230VAC T2A 115V T4A 125 C 115V 6A04 (150R/5W) X 2 115V PRIM1(39.5V) Mains 230/115V 6A04 BD139 2200u/63V 2200u/63V 6A04 SW DPDT 230V 6A04 115V PRIM2(39.5V) 47u/50 47u/50 Title Size Number Revision Date: 4/29/2012 Sheet of File: \\..\AMC+120.SCH Drawn By:...
  • Page 17 IC4B 100K LM358 47/25 220E C1815 TO AMP 220E/2W 1000/25 LED1 Changed gain R16 22k->12k, C12 220p->100p, R19 1k->4k7 22/05/08 AUSTRALIAN MONITOR REVISION NOTE: DATE 12V1W DRAWING No: SIL/16/0345 DESCRIPTION: AMC Mixer DATE: 2009-5-5 DRAWN BY: SHEET Changed to 4 channels...
  • Page 18 R28 R29 1/2 VCC OUT- OUT+ TAPE OUT R32 R33...
  • Page 19 1/2 VCC OUT+ OUT- TAPE OUT PRIORITY SIG+ SIG- +VCC +VCC MUTE TONE OUT...
  • Page 20 +24V...
  • Page 21 TEST PROCEDURE XXXX-1 MODEL: AMC+120P Rev A 22/09/08 Original Outline 1. Physical checks 2. Set up amplifier for test 2.1. Fuse check 2.2. Connections 2.3. Reset controls 3. Power up 3.1. Voltages 3.2. Bias setup 4. Initial AC Checks 4.1. Signal check and gain of amp 4.2.
  • Page 22 Test Procedure VISUAL INSPECTION STAGE Physical checks • All screws for tightness (esp. bridge rectifier and transistor bolts), referring to the torque setting of the manufacturing tools • Capacitors for polarity • Earth connection for good contact, using multimeter (XLR GND to AC earth) •...
  • Page 23 (P/F) Slowly adjust the preset PR1 so that you get 4.5mVDC (+/-0.5mVDC) reading. Check Quiescent Voltage across all Emitter resistors. (P/F) The emitter resistor voltages shall be 4.5mVDC (+/-2.0mVDC). [Setup for next test] Initial AC Checks : 4.1. Signal check and gain of amp Setup Signal generator = 260mVAC, 1kHz Signal in = XLR...
  • Page 24 FINAL TESTING REQUIREMENTS FOR FINAL TESTING: a) THD meter b) Load 80Ω c) Multimeter d) Oscilloscope e) Microphone f) Variac Setup Signal generator = 260mVAC, 1kHz Signal in = XLR Master pot = min (CW) Output metering = 100Vout Load = 80ohm Procedure Turn up master pot to 70VAC (+/-1.0VAC) on output.
  • Page 25 Values to be recorded Value Pass Range Bandwidth - low <75Hz Bandwidth - high >20kHz Phase Setup Signal generator = 260mVAC, 1kHz Signal in = XLR Master pot = max (CW) Output metering = 100Vout Load = 80ohm Procedure Attach channel 2 of the CRO to the input. Make sure the CRO is being triggered by the input.
  • Page 26 Load = 80ohm Procedure Adjust volume pot to an output reading of 70VAC. Connect a thermometer to the temperature sensor. Wait the unit to heat up. A heat gun may be used to speed up the heating of the heatsink. (P/F) The output shall mute to <...
  • Page 27 LISTENING TEST REQUIREMENTS FOR LISTENING TEST SETUP: a) CD Player b) mixer c) Speaker 14. Listening Test Connect amplifier to the setup Keep all pots full, tone at center. 14.1. Switch on thump Switch on the set and check for any ON Thump. Ensure unit does not thump. Check that no low frequencies are audible.
  • Page 28 Mixer board AMC+120MB B06044 AMC+30 output board AMC+30OPB B03048 AMC+60 output board AMC+60OPB B06047 AMC120+ mixer board AMC+120MB B06044 AMC+120 output board AMC+120OPB B012046 AMC+250 output board AMC+250OPB BR025001 Transformers AMC+30 mains transformer AMC+30TX BR030123 AMC+30 output transformer AMC+30OT BR030124...

  • Page 29: Service Bulletin

    Mains Fuses 20 February 2012 Applicable Models This bulletin applies to AMC+30, AMC+60, AMC+120 and AMC+250 Mixer Amplifiers and the AMC+120P, AMC+1202P and AMC+250P Booster Amplifiers manufactured prior to 2012. Known Issue The AMC+ range of mixer amplifiers and AMC+ booster amplifier have experienced a higher than acceptable incidences of mains fuse failures at turn on.

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