AUSTRALIAN MONITOR AMIS250 Series Service Manual
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AUSTRALIAN MONITOR AMIS250 Series Service Manual

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AMIS250 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 AMIS250 Series

  • Page 1: Product Description

    AMIS250 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: Power Switch

    AMIS250 Circuit Description The AMIS250 mixer amplifier is designed for commercial installations. It operates on [230/240 VAC, 50Hz] (240V version)/[115VAC, 60Hz] (115V version) and may be desk or rack mounted (rack mount kit supplied). The AMIS250 delivers 250 watts into a load of 4 ohms, [70 or 100 volt line] (240V version)/ [25 or 70 volt line] (115V version).
  • Page 3 A particularly good aspect of this amplifier is the current limiting circuit. The sensing circuit is a standard rail load line limiting circuit but it is the drive circuit that is important. As transistors V12 & V6 (BC640) turn on transistor V11 (BC639), it pulls bias current away from the amp through diodes D1 & D4 (BAV21) and pulls drive away from the op amp IC1 (LM1458) through the diode/resistor pair D2/R12 (BAV21/3k3) &...

  • Page 4: Phantom Power

    Phantom Power This button enables or disables the 15 volts DC phantom power to all microphone inputs XLR’s. Do not plug an unbalanced microphone in any amplifier or mixer when phantom power is switched on. The phantom voltage is connected through 4k7 1/4W resistors. The maximum current draw available per microphone is approximately 3mA.
  • Page 5 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 and 2) will automatically mute. The level of the tone generator is controlled by the pot labeled R6 (located behind the Bass adjustment pot).
  • Page 6 DC: 10 Amperes Slow Blow (115V version) Mains: 230 VAC 8 Amperes Slow Blow DC: 10 Amperes Slow Blow...
  • Page 7 TEST PROCEDURE MODEL - AMIS 250 (US) 1. Perform physical inspection (Visual Inspection stage). 1.1 Check: • All screws for tightness (esp. bridge rectifier and transistor bolts), • 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 8 AC Check: 4.1 Set signal generator to 1mV. Turn up Mic1 volume control to full. Watch for irregularities in the output waveform. 4.2 Set output voltage to 35V using the master volume control. Check voltages across the Emitter resistors (on the output power devices) 4.3 Voltage should be between 150mV –...
  • Page 9 Priority check 7.2 Plug microphone into input 1 and oscillator to input 3. Check for muting of channel 3. 7.3 Plug microphone into input 2. Check for muting of channel 3. 7.4 Check ‘Mute Disable’ function. Insert Disable / Enable link (Factory set – ENABLE). Check 4 tone switched inputs.
  • Page 10 0.047 BD139 1N4004 35VDC 0.047 0R22 0R22 0R22 0R22 0R22 0R22 470u 470R TIP36C TIP36C TIP36C TIP36C TIP36C TIP36C TIP42C IC1A BC546 LM1458 BC639 BC640 100K OUTPUT TR QC/1 100R 330R +BAT TERMINAL BD140 D5 1N4004 TO 24VAC 1N4004 120p POWER TR BAV21 BAV21...
  • Page 11 AG(1/2VCC) TAPE OUT 100K .03u 470u 100R X1/1 .47u IC2A LM1458 X3/1 +19VDC IC3B 100u LM1458 TAPE 100R .03u 100P 100k 100P X2/1 IC1B 1458 X2/3 BC546 120k X2/4 X2/5 X2/6 +19V IC3A IC2B LM1458 LM1458 100R 100R 100k M5222 100k IC1A BC546...
  • Page 12 10A SB TAPE OUT 100K +45VDC X1/1 +VCC 100K 4u7(NP) 10A SB AG(1/2 VCC) 150P 680R 4u7(NP) 100R 78LS18 X2/1 19VDC CH 1 OUT 680R 4u7(NP) 100u IC1B CH 2 OUT LM1458 CH 3 OUT LINE OUT 100R CH 4 OUT 150P 7 XLR CH 5 OUT...
  • Page 16 AMIS250 Power amp Component List Designator Part Type Description Manufacturer's Code 470n Metalised Poly 100V 2124262472 Electrolytic 35V 2121250470 100n Metalised Poly 100V 2124282101 Multi Layer Ceramic 100V 2127181220 Multi Layer Ceramic 100V 2127181220 Electrolytic 35V 2121250470 Electrolytic 35V 2121250470 .33u Metalised Poly 100V 2124282331...
  • Page 17 470R Resistor, metal film 1/2 watt 9111590471 330R Resistor, metal film 1/2 watt 9111590331 Resistor, metal film 1/2 watt 9111590102 Resistor, metal film 1/2 watt 9111590472 Resistor, metal film 1/2 watt 9111590103 Resistor, metal film 1/2 watt 9111590105 Resistor, metal film 1/2 watt 9111590102 Resistor, metal film 1/2 watt 9111590332...
  • Page 18 Resistor, metal film 1/2 watt 9111590473 2P2T Relay 2523120001 BD139 Transistor 2141400139 TIP42C Transistor 2141300042 BC639 Transistor 2144200639 BC640 Transistor 2144200640 TIP36C Transistor TOP-3 2141600036 TIP36C Transistor TOP-3 2141600036 TIP36C Transistor TOP-3 2141600036 TIP36C Transistor TOP-3 2141600036 TIP36C Transistor TOP-3 2141600036 TIP36C Transistor TOP-3...
  • Page 19 AMIS250 Mixer Component list Designator Part Type Description Manufacturer's Code Metalised Poly 100V 2124180562 Electrolytic 35V 2121230479 Electrolytic 35V 2121230479 Electrolytic 35V 2121250470 Multi Layer Ceramic 100V 2127181820 Multi Layer Ceramic 100V 2127280336 Electrolytic 35V 2121230479 .03u Multi Layer Ceramic 100V 2127280336 Electrolytic 35V 2121230479...
  • Page 20 IC3B LM1458 Dual op-amp DIP 8 Pin 2152810458 M5222 VCA DIP 8 Pin 2153850222 16C55 PIC-16C55X1,TP,28PIN 2159601655 M5222 VCA DIP 8 Pin 2153850222 7805 Regulator, T092 2151270805 Resistor, metal film 1/2 watt 9111590103 Potentiometer Linear 2021000503 Resistor, metal film 1/2 watt 9111590105 Resistor, metal film 1/2 watt 9111590100...
  • Page 21 Not Required Not Required 470R Resistor, metal film 1/2 watt 9111590470 Resistor, metal film 1/2 watt 9111590103 Resistor, metal film 1/2 watt 9111590103 Cermet Horizontal 2002211103 Resistor, metal film 1/2 watt 9111590473 Resistor, metal film 1/2 watt 9111590103 100k Resistor, metal film 1/2 watt 9111590104 Resistor, metal film 1/2 watt 9111590222...
  • Page 22 AMIS250 Input PCB component list Designato Part Type Description Manufacture's Code 1 XLR XLR Connector female 2587210266 2 XLR XLR Connector female 2587210266 3 XLR XLR Connector female 2587210266 4 XLR XLR Connector female 2587210266 5 XLR XLR Connector female 2587210266 6 XLR XLR Connector female...
  • Page 23 Electrolytic 35V 2121230479 Metalised Poly 100V 2124182100 Electrolytic 35V 2121230479 100u Electrolytic 25V 2121220101 150P Multi Layer Ceramic 100v 2127180155 150P Multi Layer Ceramic 100v 2127180155 150P Multi Layer Ceramic 100v 2127180155 150P Multi Layer Ceramic 100v 2127180155 4u7(NP) Non Polar Electrolytic 50V 2120250479 10A SB 10A SB...
  • Page 24 Resistor, metal film 1/2 watt 9111590100 Resistor, metal film 1/2 watt 9111590223 Resistor, metal film 1/2 watt 9111590223 100K Resistor, metal film 1/2 watt 9111590104 680R Resistor, metal film 1/2 watt 9111590681 680R Resistor, metal film 1/2 watt 9111590681 Resistor, metal film 1/2 watt 9111590472 Resistor, metal film 1/2 watt 9111590472...
  • Page 25 AMIS 250 Major Components price list Part Description Manufacturer code in house AUD$ PCB's Mixer Mixer PCB S5728MAMIS250S16 $75.54 Input Input PCB assy S5728MAMIS250S17 $26.26 Output Output PCB assy S5728MAMIS250S18 $114.43 Display PCB S5728MAMIS250S21 $5.13 Transformers 2651983262 230/240VAC Mains 230/240V $56.76 120VAC Mains 120V...
  • Page 26 Barrier Strip 6 6 way barrier connector 2583528306 $2.51 Phono connector 1/4" socket 2582110645 $0.86 XLRF 2587210266 $1.34 XLMR 2587110227 $1.08 Screw + washer Black screw w/star 2316420308 $0.04 Screw Black screw wo/star 2316421306 $0.04 Knob volume & master 9346110015 $0.12 Acrylic cover for 9347560006...

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