AUSTRALIAN MONITOR DCM Series, Service Manual

Page 1: ...DCM500 Service Manual Product Description Set Up Test Procedures Component Lists Full Schematics PCB Overlays ...

Page 2: ...e amplifier The sensing for the circuit is taken on the amplifier side of the output transformer The 0dB level is referenced to 100V This is an RMS meter not a peak meter Protect The protect LED will illuminate when the amplifier cuts out because of either over current or high temperature The amplifier will switch back on after approx 4 sec for an over current trip The amplifier will switch back o...

Page 3: ...fore plugging in a power lead please check the rear panel of the amplifier to ensure that the voltage switch is set correctly for your part of the world The inlet is equipped with an in built AC fuse containing the rated fuse and a spare 24 Volt DC Power Inlet The DCM series feature optional 24VDC power to run off a battery back up if required This is connected via the rear binding posts The front...

Page 4: ... XLR s are connected in parallel so either will work The XLR s inputs are transformer balanced and wired as Pin 1 Shield Pin 2 Hot Positive Pin 3 Cold Negative Fuse Sizes DCM120 Mains 230 VAC 4 Amperes Slow Blow HRC 20x5mm DC 10 Amperes Slow Blow HRC 20x5mm DCM250 Mains 230 VAC 6 3 Amperes Slow Blow 20x5mm DC 2 x 10 Amperes Slow Blow HRC 3AG DCM500 Mains 230 VAC 10 Amperes Slow Blow HRC 20x5mm DC ...

Page 5: ...e 4AT 6 3 AT 10 AT DC fuse 10AT x1 10AT x2 35AT x2 2 2 Connect the Amplifier to the setup Variac voltage 0V set all presets on front board only fully clockwise voltage selector switch to 230V 2 3 Slowly increase the input voltage to 230V keep watching the input current should not exceed 0 1A for DCM 120 0 1A for DCM 250 0 1A for DCM 500 2 4 Check and reset if necessary all emitter resistor voltage...

Page 6: ...ut signal to get 820mV for DCM 120 425mV for DCM250 DCM 500 Turn preset P2 anticlockwise such that it just mutes the output signal and signal returns back slowly after 2 seconds 9 Reduce the signal re check whether the signal mutes at the corresponding above stated voltages 10 Again make the output load to original full value Turn volume preset fully anticlockwise set input signal strength to 1V s...

Page 7: ...of File C DCM Manuals CD6203 1 DDB Drawn By C8 0 15u S1 F3 35A F1 10A F2 35A D1 40A C3 C4 C2 C1 BR1 T1 R2 47R R1 4K7 R3 100R D3 12V D2 RY1 BR3 C5 4u7 C6 4u7 C7 10u V1 BC639 C 5 4 3 2 1 X1 1 SBG 24V BATTERY 35VDC 240AC IN 10000U X1 X4 X2 X3 X5 X6 X7 1 2 3 X8 1 2 3 CD6203 1 DCM500 POWER SUPPLY PCB6203 2 ...

Page 8: ...50R R4B 1K R4A 1K R3B 220R R3A 220R R2B 220R R2A 220R R10A 1K R10B 1K IC1B 78L05 V7A V8A R18A 2K2 R19A R22 R20A 2K2 R21A R22 V7B V8B R18B 2K2 R19B R22 R20B 2K2 R21B R22 V6A V6B R17B R22 R17A R22 R16A 2K2 R16B 2K2 V9A V9B R23A R22 R23B R22 R22A 2K2 R22B 2K2 R40B 1K R41A 10k NTC R41 NOT USED C X4 TO FAN X3 TO PCB6200 X2 X2 TO PCB6200 X1 X1 TP PCB6203 PCB6202 X4 TO FAN X3 TO PCB6200 X4 X2 TO PCB6200 ...

Page 9: ...9 T1B T1A R8 100R R7 100R R6 680R R5 680R R4 10K R3 10K R2 68K R1 68K IC2A LM358 R35 33K LK2 LK3 0R C9 47u C26 4u7 LK4 0R VDD 1 GP5 2 GP4 3 GP3 4 GP2 5 GP1 6 GP0 7 VSS 8 IC6 PIC12C509 D26 D24 D23 D22 D21 D20 D19 D18 D17 R48 1K R49 10K LK6 0R R46 1K2 R45 2K7 D25 R41 D31 C35 4u7 VCC R43 470R R44 1K C32 4u7 V4 BC556 D10 D16 V8 BC556 R26 10K VCC V9 BC556 R32 470K C20 47u PROTECT Desc 2 3 4 5 6 7 Pin G...

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Page 14: ...6 4u7 Electrolytic Capacitor 50V 2121250479 C7 10u Electrolytic Capacitor 50V 2121230100 C8 0 15u Metalised Poly Capacitor 275V 2124290158 D1 40A Stud Mount Rectifier Diode 40A 2135940100 D2 1N4007 Rectifier Diode 2133440007 D3 12V Zener diode 1W 12V 2136010120 F1 Fuse refer user manual F2 35A Fuse 35A 3AG 2541120350 F3 35A Fuse 35A 3AG 2541120350 R1 4K7 Resistor metal film 5W 9111590472 R2 47R PW...

Page 15: ...V 2121260229 C6 2u2 Electrolytic Capacitor 35V 2121260229 C7 100u Electrolytic Capacitor 16V 2121210101 C8 100P Multi layer ceramic capacitor 2127181101 C9 47u Metalised Poly Capacitor 63V 2124262472 D1 1N4148 Rectifier Diode 2133440148 D10 L LED red LED 3 0mm 2137200003 D13 L LED red LED 3 0mm 2137200003 D16 1N4148 Rectifier Diode 2133440148 D17 L LED red LED 3 0mm 2137200003 D18 L LED red LED 3 ...

Page 16: ...istor metal film 5W 9111590104 R29 10K Resistor metal film 5W 9111590103 R3 10K Resistor metal film 5W 9111590103 R30 10K Resistor metal film 5W 9111590103 R31 10k Resistor metal film 5W 9111590103 R32 470K Resistor metal film 5W 9111590474 R33 22K Resistor metal film 5W 9111590223 R34 22K Resistor metal film 5W 9111590223 R35 33K Resistor metal film 5W 9111590333 R36 10K Resistor metal film 5W 91...

Page 17: ...144200639 V3 BC546 Transistor TO92 2144200546 V4 BC556 Transistor TO92 2144200556 V5 BC546 Transistor TO92 2144200546 V6 BC546 Transistor TO92 2144200546 V7 BC546 Transistor TO92 2144200546 V8 BC556 Transistor TO92 2144200556 V9 BC556 Transistor TO92 2144200556 Please note DCM120 DCM500 Please note DCM250 ...

Page 18: ... 2K2 Resistor Metalfilm 5W 9111590222 R16B 2K2 Resistor Metalfilm 5W 9111590222 R17A R22 Wire wound resistor 5W 2111450228 R17B R22 Wire wound resistor 5W 2111450228 R18A 2K2 Resistor Metalfilm 5W 9111590222 R18B 2K2 Resistor Metalfilm 5W 9111590222 R19A R22 Wire wound resistor 5W 2111450228 R19B R22 Wire wound resistor 5W 2111450228 R1A 220R Resistor Metalfilm 5W 9111590221 R1B 220R Resistor Meta...

Page 19: ...etalfilm 5W 9111590102 T2 V16 TIP41C Transistor TO220 2141300041 V1A TIP41C Transistor TO220 2141300041 V1B TIP41C Transistor TO220 2141300041 V2A IRF9520 Mosfet hexfet 2142309520 V2B IRF9520 Mosfet hexfet 2142309520 V3A BC556 Transistor T092 2141600035 V3B BC556 Transistor T092 2141600035 V4A TIP35C Transistor TOP 3 2141600035 V4B TIP35C Transistor TOP 3 2141600035 V5A TIP35C Transistor TOP 3 214...

Page 20: ...TO3P transistor 2141600035 TIP36C 3 60 TIP41C PNP TO220 transistor 2141300041 TIP42C 2 01 BC639 NPN TO92 2144200639 S7007 0 16 BC640 PNP TO92 2144200640 S7008 0 16 BD140 PNP TO92 2141400140 0 22 BD139 NPN TO92 2141400139 S7009 0 22 LM1458 IC Dual Op amp 2152801048 LM1458 0 27 LM833N IC Dual Op amp 2157800833 LM833 1 05 LM358 IC Dual Op amp 2152800358 LM358 1 05 LM78L05 IC Regulator 2151270805 LM78...

Page 21: ...6 way barrier connector 2583528306 2 51 XLRF XLF Female connector 2587210266 1 35 XLMR XLR Male connector 2587110227 1 08 Screw washer Black screw w star 2316420308 0 08 Screw Black screw wo star 2316421306 0 08 Acrylic cover for Clear cover for 6 way 9347560006 0 31 terminal barrier connector Fuse Holder DCM series fuse holder 2344400322 1 00 FAN 12V DCM Series 12vdc fan 2571120122 6 33 ...