Related Manuals for AUSTRALIAN MONITOR DCM500
Summary of Contents for AUSTRALIAN MONITOR DCM500
- Page 1 DCM500 Service Manual Product Description Set-Up/Test Procedures Component Lists Full Schematics PCB Overlays...
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Page 2: Circuit Description
To set the current limit: 1. Reset the trimpot P1 turning fully clockwise. 2. Connect the amplifier to half it’s minimum load (10ohm for DCM500, 20ohm for DCM250, 40ohm for DCM120). 3. Run an rms 1kHz sine wave into the amplifier and set the input level so that you read 425mVDC (DCM250/500) or 825mVDC (DCM120) across the emitter resistor, measuring the side which has the higher current (measured as a voltage across the emitter resistors). -
Page 3: Power Amp
The thermal cutout and fan is controlled by a microprocessor (PIC12C509A). The temperature is sensed using a 10k@25degC NTC. The fan is normally off and turns on to full speed at 60degC. This temperature is fixed and not adjustable. The thermal cutout temperature is set using the trimpot accessible through the hole in the top left side of the chassis return (only visible with the lid off). - Page 4 DCM120 – 80 ohms DCM250 – 40 ohms DCM500 – 20 ohms XLR Audio Input and Parallel Output The DCM series includes both male and female 3 pin XLR connectors per channel. While the female is normally used as the input to the amplifier, both XLR’s are connected in parallel so either will work.
- Page 5 TESTING PROCEDURE OF DCM 120/DCM 250/DCM 500 I. PRE-TESTING (of complete sets). • Check 1.1 All screw for tightness (Bridge rectifier and transistor bolts) 1.2 Earth Connection for good contact (solder and crimpling) 1.3 This setup has signal input to the Amplifier through male (XLR) 1.4 Check with Multimeter that there is a DC resistance of about 250 Ω...
- Page 6 II. FINAL TESTING (This setup should have signal input to Amplifier through female (XLR) (The limiter link should be out of circuit initially.) 1. Connect the Amplifier to the setup, set voltage selector switch to 240V 2. Switch ON the set to 240VAC. 3.
- Page 7 BATTERY +35VDC 240AC IN 10000U BC639 0.15u 100R PCB6203 DCM500 POWER SUPPLY Title CD6203-1 Size Number Revision Date: 6-May-2003 Sheet of File: C:\DCM Manuals\CD6203-1.DDB Drawn By:...
- Page 8 R15B R16B R17B R18B R19B R20B R21B R22B R23B 150R 150R R42B R38B 11 X TIP35C 220R 220R R36B 500R +35V PCB6201 220R DCM500 POWER PCB Title CD6201-1 Size Number Revision Date: 8-May-2003 Sheet of File: C:\DCM Manuals\CD6201-12.DDB Drawn By:...
- Page 9 Microprocessor Mute/Limiter/Drive 100P PIC12C509 IC3A R16 2M2 SA571 X3/1 X1/1 680R R35 33K X1/2 BC639 100K .47u X1/3 IC4B LM833-B Desc GP0-OUT = 1/2VCC CON X2/1 100R AGND (N/C) GP1-OUT = FAN CON 100K IC2A LM358 GP2-OUT = PRTCT/MUTE GP3-IN = I LIMIT GP4-IN = FAN SENSE...
- Page 14 DCM500 Power Supply Components List Designato Part Type Description Manufacturer's code KBPC3504 Bridge recitfier 600V/35A 2134800356 KBPC3504 Bridge recitfier 600V/35A 2134800356 15000uF Electrolytic Capacitor 50V 2121250153 15000uF Electrolytic Capacitor 50V 2121250153 15000uF Electrolytic Capacitor 50V 2121250153 15000uF Electrolytic Capacitor 50V...
- Page 15 DCM Series Drive Stage Component List Designato Part Type Description Manufacturer's Code Electrolytic Capacitor 35V 2121260229 Electrolytic Capacitor 35V 2121260229 Electrolytic Capacitor 35V 2121250220 Electrolytic Capacitor 35V 2121260229 Multi layer ceramic capacitor 2127181470 Multi layer ceramic capacitor 2127181470 100u Electrolytic Capacitor 16V 2121210101 100u Electrolytic Capacitor 16V...
- Page 16 Link, zero ohms 9111590000 Link, zero ohms 9111590000 Cermet, preset Horizontal 2112210202 Potentiometer 16mm 2112211473 Cermet, preset Horizontal 2112210103 Resistor, metal film .5W 9111590683 Resistor, metal film .5W 9111590102 390R Resistor, metal film .5W 9111590391 100R Resistor, metal film .5W 9111590101 Resistor, metal film .5W 9111590103...
- Page 17 BC639 Transistor TO92 2144200639 BC546 Transistor TO92 2144200546 BC556 Transistor TO92 2144200556 BC546 Transistor TO92 2144200546 BC546 Transistor TO92 2144200546 BC546 Transistor TO92 2144200546 BC556 Transistor TO92 2144200556 BC556 Transistor TO92 2144200556 Please note * DCM120-DCM500 Please note ** DCM250...
- Page 18 DCM500 Output stage Components List Designator Part Type Description Manufacturer's Code 820P Multi layer Ceramic Capacitor 2127181821 820P Multi layer Ceramic Capacitor 2127181821 1N4007 Rectifier Diode 2133440007 1N4007 Rectifier Diode 2133440007 1N4007 Rectifier Diode 2133440007 1N4007 Rectifier Diode 2133440007 1N4007...
- Page 19 R40B Resistor, Metalfilm .5W 9111590102 R41A 100D R42B Resistor, Metalfilm .5W 9111590100 Resistor, Metalfilm .5W 9111590102 Resistor, Metalfilm .5W 9111590102 150R Resistor, Metalfilm .5W 9111590151 150R Resistor, Metalfilm .5W 9111590151 150R Resistor, Metalfilm .5W 9111590151 150R Resistor, Metalfilm .5W 9111590151 Resistor, Metalfilm .5W 9111590100 Resistor, Metalfilm .5W...
- Page 20 DCM500 Major Components price list Part Description Manufacturer code in house AUD$ PCB's Power Supply PCB Capacitor mount PCB S5728MDCM50003 $47.13 Input Input PCB assy S5728MDCM50005 $10.05 Output Left Output PCB assy S5728MDCM50001 $66.79 Output Right Output PCB assy S5728MDCM50002 $62.75...
- Page 21 Hardware Front Panel Front Panel DCM500 S600000132 $4.88 Top cover DCM500 S600000130 $13.14 Rack ears Rack ears S600000137 $4.35 Chassis Chassis Pan DCM500 S600000129 $22.92 Barrier Strip 6 way barrier connector 2583528306 $2.51 XLRF XLF Female connector 2587210266 $1.35 XLMR...
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