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.
AMlilrDlilil@ () o n4 lw u N I cAT ..........',..'........'.'''.'.'.'......H'. ft{tTl I O N SPrY Lro ..tlllii6'ui0.li'i.iii:i."",i"-"i';i''itititt;;'. '.'....'.....'.'...'..'...'.'.'.'..'..'.'.'.'.'.'.'.'.'.'.'.'.'.':.'.'.'.'.....'.': :':': :::::::.: :.
DCM500, 500 Watt Power Amplifier Product Description The DCM500 is a 500 watt power amplifier in a two rack unit (2RLI) chassis suitable for table or direct 19" rack mounting. The DCM500 has outputs for 70 & 100 volts and 4 ohms. It has a balanced input of 10K ohms. The DCM500 will operate from 240 V AC @ 50 IIz or I I 0 VAC @ 60 Hz (not user selectable, internal, factory adjushent only, specifi at the time of ordering) or 24 VDC and will meet it's full performance specification on either voltage supply.
Amplifier Status Display Window: The status display window highlights the operating conditions of the DCM500. Please refer to Figwe #1 on the back page of this instruction sheet with numerical reference as follows: High Temperature: firis red LED glows if the fan has failed and the amplifio has been shut down by its' temperature control circuity.
ll||lltl!!! ltltllll!!l lllrltllrll E lol{.o Ei"= tel lglt'. \l -Hi;; dl -:::f c::------------__f (_------------- -::-----------) -_-:-_---r -c_:_-----------l -:l -__-:f -- U o (tl O o BI --------.
DCM Series Circuit Description The DCM series are power amplifiers designed for commercial installations. They can be used for either low impedance (4 ohm/8 ohm) or constant voltage line speakers (100v/70v). These amplifiers can be mounted in a standard 19” equipment rack or they can be used on a shelf or table. The DCM series feature line level input (with parallel output) and are normally used with mixers, mixer amplifiers or other power amplifiers. The DCM series will operate from mains voltage or 24VDC.
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). Turning the trimpot cw will decrease the point at which the amp cuts out ie the amp will cut out earlier.
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. The XLR’s inputs are transformer balanced and wired as: Pin 1: Shield.
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 between Pin2 & Pin3 of each of XLR’s. Also between (Pin 1 & Pin 3) and (Pin1 & Pin2). There should be very high resistance. (IE: no reading). 2.
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. Slowly increase the input signal (of 1kHz) keep watching the 24dB LED, it should glow at approx 9V output. Increase the input signal to get 70VAC output. 4. Check Dc voltage of all emitter resistors, Minimum value should be within 30% of the maximum value.
1 2 3 4 5 6 8 7 X1 1 2 3 D D 4 5 D1 40A BATTERY F2 35A + 24V - F1 10A F3 35A T1 +35VDC BR1 C1 240AC IN C2 C3 C4 10000U C C S1 X8 1 2 3 X6 X5 X4 X1 R2 47R X3 X2 X7 1 2 3 BR3 V1 BC639 C8 C5 4u7 0.15u R3 100R C6 4u7 RY1 R1 4K7 C7 10u D3 12V B B D2 PCB6203 A A Title Size A3 Date: File: 1 2 3 4 5 6 DCM500 POWER SUPPLY CD6203-1 B Number 28-Aug-2002 Sheet of C:\Protel Files\CDTRAX\CD6203-1.
1 2 3 4 5 6 7 8 X1 1 2 3 D D 4 5 D1 40A BATTERY F2 35A + 24V - F1 10A F3 35A T1 +35VDC BR1 C1 240AC IN C2 C3 C4 10000U S1 C X8 1 2 3 X6 X5 X4 C X1 X3 R2 47R X2 X7 1 2 3 BR3 V1 BC639 C8 R3 100R C5 4u7 0.15u C6 4u7 RY1 R1 4K7 C7 10u D3 12V B B D2 PCB6203 A A Title Size A3 Date: File: 1 2 3 4 5 6 DCM500 POWER SUPPLY CD6203-1 C Number 6-May-2003 C:\DCM Manuals\CD6203-1.
1 2 3 4 5 6 7 8 D D 16V 1 16 IC3A NE570 2 2u2 3 C10 C5 2u2 R35 33K 100K R15 C8 100P 5 12 6 11 7 10 8 9 4 C C13 47P C12 2u2 C17 2u2 R25 10K LK2 X1/3 R24 10k R20 10k 100K LM358 V3 R30 2K2 C22 47u 7 8 LK4 IC2A C3 10u D1 C23 R8 100R 100P R21 10k R31 2K2 6 2 X4/5 R12 100R LK3 R10 1K LK5 4 R32 56K R4 10K C2 2u2 IC4A 2u2 C21 C24 .
1 2 Microprocessor 3 4 5 6 8 7 Mute/Limiter/Drive VCC 13 VCC D 2 3 4 VDD VSS GP5 GP0 GP4 GP1 GP3 GP2 1 8 R16 2M2 7 2u2 C10 X3/1 6 C5 2u2 47K P2 5 R35 33K 100K R15 I/O Desc 7. GP0-OUT = 1/2VCC CON 6. GP1-OUT = FAN CON 5. GP2-OUT = PRTCT/MUTE 4. GP3-IN = I LIMIT 3. GP4-IN = FAN SENSE 2.
1 2 3 4 5 6 8 7 DCM500 D V10-V15 = TIP35C X1 1 500R 2 3 R36A 220R R1A R25,R27,R29,R31,R33, R35 = 0.
1 2 3 4 5 6 8 7 DCM500 D V10-V15 = TIP35C X1 1 500R 2 R36A 3 220R R1A R25,R27,R29,R31,R33, R35 = 0.
DCM500 Power Supply Components List Designator BR1 BR3 C1 C2 C3 C4 C5 C6 C7 C8 D1 D2 D3 F1 F2 F3 R1 R2 R3 RY1 S1 T1 V1 Part Type KBPC3504 KBPC3504 15000uF 15000uF 15000uF 15000uF 4u7 4u7 10u 0.
DCM Series Drive Stage Component List Designator C1 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C2 C20 C23 C26 C3 C32 C33 C35 C4 C5 C6 C7 C8 C9 D1 D10 D13 D16 D17 D18 D19 D2 D20 D21 D22 D23 D24 D25 D26 D27 D31 D4 IC1 IC2A IC2B IC3 IC4A IC4B IC5 IC6 Part Type 2u2 2u2 22u 2u2 47P 47P 100u 100u 2u2 4u7 47u 2u2 47u 100P 4u7 10u 4u7 4u7 4u7 2u2 2u2 2u2 100u 100P .
LK2 LK3 LK4 LK6 P1 P2 P4 R1 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R2 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R3 R30 R31 R32 R33 R34 R35 R36 R4 R41 R41 R42 R43 R44 R45 R46 R48 R49 R5 R51 R53 R55 R56 R6 R7 R8 R9 0R 0R 0R 0R 2K 47K 10K 68K 1K 390R 100R 10K 22R 100K 2M2 47K 1K 100K 68K 10k 39k 10k 10K 10k 10K 10K 2M2 100K 10K 10K 10K 10k 470K 22K 22K 33K 10K 10K 15K* 12K** 1K 470R 1K 2K7 1K2 1K 10K 680R 1K 1K 10K 10K 680R 100R 100R 5K6 Link, zero ohms Link, zero ohms Link, zero ohms Link, zero ohms Cermet,
T1A T1B V1 V2 V3 V4 V5 V6 V7 V8 V9 RF2285A RF2285B BC639 BC639 BC546 BC556 BC546 BC546 BC546 BC556 BC556 Please note Please note Driver Transformer Driver Transformer Transistor TO92 Transistor TO92 Transistor TO92 Transistor TO92 Transistor TO92 Transistor TO92 Transistor TO92 Transistor TO92 Transistor TO92 * DCM120-DCM500 ** DCM250
DCM500 Output Stage Components List Designator C1A C1B D1A D1B D2A D2B D3A D3B D4 IC1A IC1B R10A R10B R11A R11B R12A R12B R13A R13B R14A R14B R15A R15B R16A R16B R17A R17B R18A R18B R19A R19B R1A R1B R20A R20B R21A R21B R22A R22B R23A R23B R2A R2B R36A R36B R37 R38A R38B R39A R39B R3A Part Type 820P 820P 1N4007 1N4007 1N4007 1N4007 1N4007 1N4007 1N4007 78L05 78L05 1K 1K 4K7 4K7 2K2 2K2 R22 R22 2K2 2K2 R22 R22 2K2 2K2 R22 R22 2K2 2K2 R22 R22 220R 220R 2K2 2K2 R22 R22 2K2 2K2 R22 R22 220R 220R 500R 500R 0R 4
R3B R40 R40B R41 R41A R42B R4A R4B R5A R5B R6A R6B R7A R7B R8A R8B R9A R9B T2 V16 V1A V1B V2A V2B V3A V3B V4A V4B V5A V5B V6A V6B V7A V7B V8A V8B V9A V9B 220R 1K 1K Resistor, Metalfilm .5W Resistor, Metalfilm .5W Resistor, Metalfilm .5W 100D 10R 1K 1K 150R 150R 150R 150R 10R 10R 470R 470R 1K 1K Resistor, Metalfilm .5W Resistor, Metalfilm .5W Resistor, Metalfilm .5W Resistor, Metalfilm .5W Resistor, Metalfilm .5W Resistor, Metalfilm .5W Resistor, Metalfilm .5W Resistor, Metalfilm .
