AUSTRALIAN MONITOR AMIS120XL Series Service Manual
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AUSTRALIAN MONITOR AMIS120XL Series Service Manual

Acm120xl is a 120 watt mixer amplifier
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AMIS120XL Series Service Manual

Product Description

Set-Up/Test Procedures
Component Lists
Full Schematics
PCB Overlays
Australian Monitor. Private Bag 149 Silverwater NSW 1811. Australia
www.australianmonitor.com.au

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Summary of Contents for AUSTRALIAN MONITOR AMIS120XL Series

  • Page 1: Product Description

    AMIS120XL Series Service Manual Product Description Set-Up/Test Procedures Component Lists Full Schematics PCB Overlays Australian Monitor. Private Bag 149 Silverwater NSW 1811. Australia www.australianmonitor.com.au...

  • Page 2: Circuit Description

    AMIS120XL Circuit Description The ACM120XL is a 120 watt mixer amplifier designed for commercial installations. It features 8 microphone/line input channels and can be used for either low impedance (4 or 8 ohm) or [70v/100v] (240V version)/[25v/70v] (115V version) line speaker systems. A host of unique features including multiple levels of muting, a VOX relay output, 24 VDC operation and VCA master level control make the AMIS120XL a very flexible amplifier.
  • Page 3 distortion. This makes for nice sounding current limit that allows for soft distorted peaks to get through but limits continuous excessive current while maintaining thermal stability. Speaker Output Terminal Strip (240V version) The screw terminals on the left hand side of the strip allow access to the direct speaker outputs of the amplifier.

  • Page 4: Phantom Power

    The balanced XLR line level output provides a maximum of 700mV to allow for the connection of up to 6 power amplifiers. Pin connections are: pin 1-earth; pin 2-signal (hot +); pin 3-signal (cold -). The output is electronically balanced with an inverting op-amp and buffered with voltage follower op amps.
  • Page 5 The switched contacts are used to break the signal internally. When an external processor is used via the insert point, it only affects the power amplifier section and line output of the AMIS120XL. The tape output remains unprocessed. VOX Relay Output The terminal strip to the immediate right of the AC inlet features a relay output.
  • Page 6 Tone Generators Four separate tones are available from the in-built tone generator board. All four tones can be activated individually via a contact closure connected to the screw terminals on the rear of the amplifier. When any tone is activated, all inputs (except for inputs 1, 2 and 3) will automatically mute. The level of the tone generator is controlled by the pot labeled R63 (located behind the Bass adjustment pot).
  • Page 7 (47uF) through R69 (100k) and the release by the discharge if C4 through R92 (2k2). The other channels operate in a similar manner. Note that VCA will mute at 250mV (-80dB) below the reference voltage so the muting will occur only over the range of approximately (depends on VCA production batch) 7.2V to 7.5V. The charging of the capacitor occurs from approximately 1V to 8.1V.
  • Page 8 TEST PROCEDURE MODEL - AMIS 120 1. Perform physical inspection (Visual Inspection stage). 1.1 Check: • Earth connection for good contact (XLR GND to AC earth), • All wiring points for good contacts (soldering and crimping) PRETESTING PRE TESTING SETUP REQUIREMENT Oscilloscope.
  • Page 9 4.5 Check the output of all channels. 4.6 Measure 25V line 70V LINE, 8ohm (32Vac) tol.5%. 4.7 Check tape outputs (L and R) 250mV (+50mV) (Measure on RCA socket). 4.8 Check line outputs. Approx. (2.7V ± 1.5V). Function Checks : 5.1 Check that you have the header link’s on to a) Vox muting enabled (Right Side).
  • Page 10 on the sine wave if it is there then reduce the voltage to 35V out and then short output. Release the shorting and check for the output. 11 Remove input signal and check for Hum & Noise (<20mVrms). 12 Reset volumes to minimum. 13 Disconnect from test bench and inspect for scratches on external paint.
  • Page 11 35VDC 0R22 0R22 0R22 560R 470R TIP36C TIP36C TIP36C TIP42C IC1A LM1458 BC639 BC640 X1/10 330P 100R 330R 1N4004 BATTERY TERM BD140 24VAC 1N4004 120p BAV21 BAV21 470n BC639 FROM MIXER PCB BC639 BAV21 TEMP CUTOUT 470k X1/7 100K 1N4004 X1/8 CT OUTPUT TR BC546...
  • Page 12 X1/1 X2/1 +VCC +VCC AG(1/2 VCC) AG(1/2 VCC) TAPE OUT TAPE OUT 150P 680R CH 1 OUT CH 1 OUT 680R IC1B SW1/1 SW1/2 CH 2 OUT CH 2 OUT LM1458 CH 3 OUT CH 3 OUT CH 4 OUT CH 4 OUT 150P CH 5 OUT...
  • Page 13 TELEPHONE INPUT TAPE OUT 600:600ohm 100K TELEPHONE INPUT A X1/1 +VCC AG(1/2 VCC) TAPE OUT 150P 680R CH 1 OUT 680R IC1B SW1/1 SW1/2 CH 2 OUT LM1458 CH 3 OUT CH 4 OUT 150P TELEPHONE INPUT B SW1/3 150P 680R 680R SW2/1...
  • Page 14 TAPE OUT 100K IC1A .033u 120K C9 22P R17 47K IC1B 100P 100K TONE GEN 100K 220p IC12A M5222 IC2A 100n IC12B 120K IC4B 470n C7 100P TO AMP IC10 R100 R12 47K RN2A 330R IC2B REMOTE CONTROL TO LINE OUT RN2B INSERT POINT IC16B...

  • Page 15: Tone Generator

    MUTE VDD 5VDC 100K 15VDC IC 8,18 R68 1K8 IC8A LM358 R34 220R IC17 .47u 16C54 R49 100K LM78L05 5VDC C18 22P X3/1 IC18 IC8B LM358 .47u EVAC C21 22P BELL 100R TONE OUT ALERT PRE AN IC14 LM7815 X1/1 BC546 470u 100R...
  • Page 20 AMIS120 Power amplifier Component list Designator Part Type Description Manufacture code Order code 470n Metalised Polyproplyene 63V 2125270477 47uF electrolytic 35V 2121230470 100n 100n Metalised Polyester 100v 2124282101 Multi layer ceramic 100V 2127181220 Multi layer ceramic 100V 2127181220 47uF electrolytic 35V 2121230470 47uF electrolytic 35V 2121230470...
  • Page 21 1/2 W Metal film resistor 9111590103 1/2 W Metal film resistor 9111590105 1/2 W Metal film resistor 9111590102 1/2 W Metal film resistor 9111590222 1/2 W Metal film resistor 9111590102 0R22 PW5 5W wire wound resistor 2111450228 0R22 PW5 5W wire wound resistor 2111450228 1/2 W Metal film resistor 9111590102...
  • Page 22 TIP42C Transistor 2141300042 TIP42C SIL6 SIL2...
  • Page 23 AMIS120XL Mixer Component List Designator Part Type Description Manufacturer's Code Electrolytic capacitor 35V 2121230479 Electrolytic capacitor 35V 2121230479 Electrolytic capacitor 35V 2121230479 470n Metalised Poly Capacitor 100V 2124262472 .033u Metalised Poly Capacitor 100V 2124282330 Multi layer ceramic 100V 2127181279 Electrolytic capacitor 35V 2121230479 100n Metalised Poly Capacitor 100V...
  • Page 24 IC13 LM1458 Dual op amp DIP8 2152810458 IC16A LM1458 Dual op amp DIP8 2152810458 IC16B LM1458 Dual op amp DIP8 2152810458 IC1A LM1458 Dual op amp DIP8 2152810458 IC1B LM1458 Dual op amp DIP8 2152810458 IC2A LM1458 Dual op amp DIP8 2152810458 IC2B LM1458...
  • Page 25 Potentiometer linear 2021000503 Resistor Metal film 1/2W 2021000503 Resistor Metal film 1/2W 9111590562 Resistor Metal film 1/2W 9111590393 Resistor Metal film 1/2W 9111590103 100K Cermet Horizontal 2002211104 Resistor Metal film 1/2W 9111590103 Resistor Metal film 1/2W 9111590103 100K Resistor Metal film 1/2W 9111590104 Resistor Metal film 1/2W 9111590682...
  • Page 26 AMIS120 Mic input Component List Designator Part Type Description Manufacturer's Code XLR Socket female PCB mount 2587210266 XLR Socket female PCB mount 2587210266 XLR Socket female PCB mount 2587210266 XLR Socket female PCB mount 2587210266 Dual RCA Dual RCA socket PCB mount 2581210102 Dual RCA Dual RCA socket PCB mount...
  • Page 27 Dual RCA Dual RCA socket PCB mount 2581210102 680R Metal film resistor 1/2w 9111590681 Metal film resistor 1/2w 9111590223 Metal film resistor 1/2w 9111590123 Metal film resistor 1/2w 9111590223 680R Metal film resistor 1/2w 9111590681 680R Metal film resistor 1/2w 9111590681 680R Metal film resistor 1/2w...
  • Page 28 SW4/1 Dip Switch 3 position 2510315003 SW4/2 Dip Switch 3 position 2510315003 SW4/4 Dip Switch 3 position 2510315003 600:600Ω Telephone isolation transformer 2651280253...
  • Page 29 AMIS120 Mic input Component List Designator Part Type Description Manufacturer's Code XLR Socket female PCB mount 2587210266 XLR Socket female PCB mount 2587210266 XLR Socket female PCB mount 2587210266 XLR Socket female PCB mount 2587210266 Dual RCA Dual RCA socket PCB mount 2581210102 Dual RCA Dual RCA socket PCB mount...
  • Page 30 Dual RCA Dual RCA socket PCB mount 2581210102 680R Metal film resistor 1/2w 9111590681 Metal film resistor 1/2w 9111590223 Metal film resistor 1/2w 9111590123 Metal film resistor 1/2w 9111590223 680R Metal film resistor 1/2w 9111590681 680R Metal film resistor 1/2w 9111590681 680R Metal film resistor 1/2w...
  • Page 31 SW4/1 Dip Switch 3 position 2510315003 SW4/2 Dip Switch 3 position 2510315003 SW4/4 Dip Switch 3 position 2510315003 600:600Ω Telephone isolation transformer 2651280253...
  • Page 32 AMIS120XL Tone Generator Component List Designator Part Type Description Manufacturer's Code C150 Metalised Poly 100V 2124282101 Multilayer Ceramic 100V 2127181220 Multilayer Ceramic 100V 2127181220 Electrolytic 50V 2121250220 .47u Metalised Poly 100V 2124262472 .47u Metalised Poly 100V 2124262472 Electrolytic 35V 2121230470 Metalised Poly 100V 2124282101 470u...
  • Page 33 Resistor Metal film 1/2w 9111590100 Resistor Metal film 1/2w 9111590100 RN1A Resistor Metal film 1/2w 9111590103 RN1B Resistor Metal film 1/2w 9111590103 RN1C Resistor Metal film 1/2w 9111590103 RN1D Resistor Metal film 1/2w 9111590103 Relay single pole double throw 2522240842 BC546 Transistor TO92 2144200546...

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