Service manual

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DCM500 Service Manual

Product Description

Set-Up/Test Procedures

Component Lists

Full Schematics

PCB Overlays

Summary of content (21 pages)

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DCM500 Service Manual Product Description Set-Up/Test Procedures Component Lists Full Schematics PCB Overlays
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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.
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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.
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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.
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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.
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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.
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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 C X8 1 2 3 X6 X5 X4 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.
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1 2 3 4 5 6 7 8 DCM500 D V10-V15 = TIP35C X1 1 500R 2 R36A 3 220R R1A R25,R27,R29,R31,R33, R35 = 0.
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1 2 Microprocessor 3 4 5 6 7 8 Mute/Limiter/Drive VCC VCC C8 100P 13 2 3 4 VDD VSS GP5 GP0 GP4 GP1 GP3 GP2 8 R16 2M2 7 X3/1 6 C5 2u2 47K P2 5 R35 33K 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. GP5-IN = THRML SENS 3 14 5 12 6 11 7 10 8 9 C13 47P VCC R29 10K 2M2 R27 15 C17 2u2 R25 10K LK2 C9 .
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DCM500 Power Supply Components List Designato Part Type BR1 KBPC3504 BR3 KBPC3504 C1 15000uF C2 15000uF C3 15000uF C4 15000uF C5 4u7 C6 4u7 C7 10u C8 0.
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DCM Series Drive Stage Component List Designato Part Type C1 2u2 C10 2u2 C11 22u C12 2u2 C13 47P C14 47P C15 100u C16 100u C17 2u2 C18 4u7 C19 47u C2 2u2 C20 47u C23 100P C26 4u7 C3 10u C32 4u7 C33 4u7 C35 4u7 C4 2u2 C5 2u2 C6 2u2 C7 100u C8 100P C9 .
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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 T1A 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 RF2285A Link, zero ohms Link, zero ohms Cermet, preset Horizontal Potentiometer 16
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T1B V1 V2 V3 V4 V5 V6 V7 V8 V9 RF2285B BC639 BC639 BC546 BC556 BC546 BC546 BC546 BC556 BC556 Please note Please note Driver Transformer Transistor TO92 Transistor TO92 Transistor TO92 Transistor TO92 Transistor TO92 Transistor TO92 Transistor TO92 Transistor TO92 Transistor TO92 * DCM120-DCM500 ** DCM250 DCM-120-24 2144200639 2144200639 2144200546 2144200556 2144200546 2144200546 2144200546 2144200556 2144200556
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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 R3B R40 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 5
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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 1K Resistor, Metalfilm .5W 9111590102 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 .5W Resistor, Metalfilm .5W Resistor, Metalfilm .5W Resistor, Metalfilm .
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DCM500 Major Components price list Part Description Manufacturer code in house AUD$ PCB's Power Supply PCB Input Output Left Output Right Display-front PCB Relay PCB Capacitor mount PCB Input PCB assy Output PCB assy Output PCB assy Display PCB Relay slow start PCB S5728MDCM50003 S5728MDCM50005 S5728MDCM50001 S5728MDCM50002 S5728MDCM50006 S5728MDCM50004 $47.13 $10.05 $66.79 $62.75 $33.44 $8.
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Hardware Front Panel Lid Rack ears Chassis Barrier Strip XLRF XLMR Screw + washer Screw Acrylic cover for terminal Fuse Holder FAN 12V Front Panel DCM500 Top cover DCM500 Rack ears Chassis Pan DCM500 6 way barrier connector XLF Female connector XLR Male connector Black screw w/star Black screw wo/star Clear cover for 6 way barrier connector DCM series fuse holder DCM Series 12vdc fan S600000132 S600000130 S600000137 S600000129 2583528306 2587210266 2587110227 2316420308 2316421306 9347560006 $4.88 $13.