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Summary of Contents for AUDIO TELEX DCM500
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Page 1: Service Information
SERVICE INFORMATION AUDIO TELEX DCM500 POWER AMPLIFIER CONTENTS: OPERATION MANUAL CIRCUIT DESCRIPTION SET-UP / TEST PROCEDURE SCHEMATIC DIAGRAMS PCB OVERLAYS COMPONENT LISTS Australian Monitor 1 Clyde Street, Silverwater NSW 2128 Australia +61 2 9647 1411 www.australianmonitor.com.au... - Page 2 AMlilrDlilil@ () o lw u N SPrY ..tlllii6'ui0.li'i.iii:i."",i"-"i';i''itititt;;'...',..'..'.'''.'.'.'..H'. '.'..'..'.'...'..'...'.'.'.'..'..'.'.'.'.'.'.'.'.'.'.'.'.'.':.'.'.'.'..'.': :::::::.: :.rel$t :':': Audio Telex Communications Pty Ltd 001345482 lncorporated ln NSW...
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Page 3: Output Level
Set Up There unlabelled, screwdriver level control adjustable output located centrally on the front panel of the DCM500. Turning this control will the clockwise direction the power output, turning increase this comtrol counter-clockwise will direction the power output. The... -
Page 4: Output Terminal Strip
LED's should oscillate and out of the red LED's in zone. the red zone are continually, (or the level of the input signal to the DCM500) the output level control the,n should adjusted reduce the output level. much output level... - Page 5 ll||lltl!!! ltltllll!!l lllrltllrll lol{.o Ei"= lglt'. -Hi;; -:::f (_------------- c::------------ -__f -::-----------) -:-_---r -__- c_:_-----------l --------.) !ll!!r!!lll lll!rllt!!l lllliltllll...
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Page 6: Power Switch
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 7: 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 8: Fuse Sizes
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 9: Electrical Check
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 10: Final Testing
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 11 BATTERY +35VDC 240AC IN 10000U BC639 0.15u 100R PCB6203 DCM500 POWER SUPPLY Title CD6203-1 Size Number Revision Date: 28-Aug-2002 Sheet of File: C:\Protel Files\CDTRAX\CD6203-1.DDB Drawn By:...
- Page 12 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 13 16VDC R16 2M2 IC3A NE570 100P X3/1 X1/1 680R X1/2 IC4B BC639 100K X1/3 .47u X2/1 100R 100K X2/2 IC2B LM358 BC546 X4/5 100R IC2A 100P 100R R21 10k NE555 IC4A X3/3 BC639 390R LM833 X3/5 680R X3/4 HI TEMP X3/2 X4/2 16VDC...
- Page 14 Microprocessor Mute/Limiter/Drive 100P PIC12C509 IC3A R16 2M2 SA571 X3/1 X1/1 680R X1/2 BC639 100K X1/3 .47u IC4B LM833-B Desc GP0-OUT = 1/2VCC CON X2/1 100R (N/C) AGND GP1-OUT = FAN CON 100K IC2A GP2-OUT = PRTCT/MUTE LM358 GP3-IN = I LIMIT GP4-IN = FAN SENSE 100P...
- Page 16 R15B R16B R17B R18B R19B R20B R21B R22B R23B 150R 150R R42B R38B 11 X TIP35C 220R 220R R36B +35V 500R PCB6201 220R DCM500 POWER PCB Title CD6201-1 Size Number Revision Date: 28-Aug-2002 Sheet of File: C:\Protel Files\CDTRAX\CD6201-1.DDB Drawn By:...
- Page 17 R15B R16B R17B R18B R19B R20B R21B R22B R23B 150R 150R R42B R38B 11 X TIP35C 220R 220R R36B +35V 500R 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 21 DCM500 Power Supply Components List Designator Part Type Description KBPC3504 Bridge recitfier 600V/35A KBPC3504 Bridge recitfier 600V/35A 15000uF Electrolytic Capacitor 50V 15000uF Electrolytic Capacitor 50V 15000uF Electrolytic Capacitor 50V 15000uF Electrolytic Capacitor 50V Electrolytic Capacitor 50V Electrolytic Capacitor 50V Electrolytic Capacitor 50V 0.15u...
- Page 22 DCM Series Drive Stage Component List Designator Part Type Description Electrolytic Capacitor 35V Electrolytic Capacitor 35V Electrolytic Capacitor 35V Electrolytic Capacitor 35V Multi layer ceramic capacitor Multi layer ceramic capacitor 100u Electrolytic Capacitor 16V 100u Electrolytic Capacitor 16V Electrolytic Capacitor 35V Electrolytic Capacitor 35V Electrolytic Capacitor 35V Electrolytic Capacitor 35V...
- Page 23 Link, zero ohms Link, zero ohms Link, zero ohms Link, zero ohms Cermet, preset Horizontal Potentiometer 16mm Cermet, preset Horizontal Resistor, metal film .5W Resistor, metal film .5W 390R Resistor, metal film .5W 100R Resistor, metal film .5W Resistor, metal film .5W Resistor, metal film .5W 100K Resistor, metal film .5W...
- Page 24 Driver Transformer RF2285B Driver Transformer BC639 Transistor TO92 BC639 Transistor TO92 BC546 Transistor TO92 BC556 Transistor TO92 BC546 Transistor TO92 BC546 Transistor TO92 BC546 Transistor TO92 BC556 Transistor TO92 BC556 Transistor TO92 Please note * DCM120-DCM500 ** DCM250 Please note...
- Page 25 DCM500 Output Stage Components List Designator Part Type Description 820P Multi layer Ceramic Capacitor 820P Multi layer Ceramic Capacitor 1N4007 Rectifier Diode 1N4007 Rectifier Diode 1N4007 Rectifier Diode 1N4007 Rectifier Diode 1N4007 Rectifier Diode 1N4007 Rectifier Diode 1N4007 Rectifier Diode...
- Page 26 220R Resistor, Metalfilm .5W Resistor, Metalfilm .5W R40B Resistor, Metalfilm .5W R41A 100D R42B Resistor, Metalfilm .5W Resistor, Metalfilm .5W Resistor, Metalfilm .5W 150R Resistor, Metalfilm .5W 150R Resistor, Metalfilm .5W 150R Resistor, Metalfilm .5W 150R Resistor, Metalfilm .5W Resistor, Metalfilm .5W Resistor, Metalfilm .5W 470R Resistor, Metalfilm .5W...
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