Classe-CA200-pwr-sm维修电路原理图.pdf

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1、PRO-SVR_LEGACY Page 1 of 14 Date: August 14, 2007 Model Number: CA-200 Rear Heatsink Class Audio Inc. Subject: Service manual Class Audio, Inc. 5070 Franois Cusson Lachine, Qubec Canada H8T1B3, RadioFans.CN 收音机爱 好者资料库 PRO-SVR_LEGACY Page 2 of 14 Table of Contents Introduction 3 Important Notes on Se

2、rvicing 3 Ordering Replacement Parts 3 Block Diagrams 4 Start up Procedure 5 Protection Modes and Indicators 6 Troubleshooting Guide 7 Output Transistors Testing and Replacement 8 Calibrations and Adjustments 9 Parts List 10 Updates 11 Fuses 13 Voltage Change 13 Remote Interface Information 14 Schem

3、atics 15 The contents of this document as well as the files associated with it contain confidential information that is proprietary to Class Audio Incorporated and are intended solely for the purpose of servicing product. No part of its contents may be used, copied, disclosed, or conveyed to any par

4、ty in any manner whatsoever without prior written permission from Class Audio Incorporated. RadioFans.CN 收音机爱 好者资料库 PRO-SVR_LEGACY Page 3 of 14 Introduction Please read this manual carefully before commencing servicing! Only qualified and authorized personnel should attempt to service this product.

5、The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated dangerous voltage within the products enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within

6、an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions. Class has a global product support network. For product assistance or to order replacement parts please contact your nearest service center always quoting the unit s

7、erial number. North America Phone: (978) 664-2870 E-mail: Europe Phone: 44 (0) 1903 221 700 E-mail: Asia Phone: (852) 2790 8903 E-mail: classebwgroup.hk Rest of the World Phone: (514) 636-6384 E-mail: Important Notes on Servicing 1.ALWAYS observe ESD precautions when handling electronic modules or P

8、CBAs. 2.NEVER exchange boards with a different revision number, unless authorized by Class. 3.ALWAYS use Class original replacement parts. The use of generic parts may void the warranty of the unit. Ordering Replacement Parts There may be a delay in processing incomplete requests. Please be sure to

9、include all required information. Remember to quote the serial number of the unit on all replacement part orders and the Class order number when returning defective parts for credit. PRO-SVR_LEGACY Page 4 of 14 Block diagrams PRO-SVR_LEGACY Page 5 of 14 Start Up Procedure When receiving a unit, an a

10、ssiduous visual inspection must be performed. Do not connect the unit without analysing the symptoms reported by the customer and the results of the inspection. Using the troubleshooting guide, find the problem and proceed to the repair. Once this step is done, follow these steps, known as the start

11、-up procedure, to ensure that everything in the unit is in working condition. 1. Proceed with a post repair visual inspection. Take the time to check if every wire is reconnected properly, every screw is bolted on, no soldering and/or metal residues lying in the unit, every fuse has been replaced, e

12、tc. 2. Connect the unit to a variable transformer, setted to 0Vac. 3. Turn the bias trimpot (RV102) counter clockwise until a click is heard. 4. Connect the bypass wire to the variable transformer. This bypass is a power cord, modified on the female side in order to bypass the soft start sequence. I

13、t is connected to the line ring on voltage selector PCB. 5. Slowly raise the voltage to 10Vac, and check positive and negative rails and pre-driver supply. Check fuses. 6. If one or more supply are not within specifications, return to the troubleshooting guide. 7. Slowly raise voltage until you hear

14、 relays click, this point is around 55Vac. Recheck every supply. 8. If one or more supply are not within specifications, return to the troubleshooting guide. 9. Raise voltage to 120Vac. Recheck every supply 10. If every supply is within specifications, unplug the unit and bypass from the variable tr

15、ansformer. Reconnect only the unit. 11. Report to Calibration and adjusments (section 9) to adjust bias and DC offset. Note that bias can be adjusted to 14mV, and the following tests can be performed before the unit is send to the burn-in bench for a 24 hours warm-up. 12. Connect the unit to a load,

16、 and to a source using balanced inputs and single ended inputs, independently. 13. Perform a test with a 200Hz, a 2kHz and a 20kHz tone, both sinus wave and square wave. Check the output with a oscilloscope, on 4 ohms and 8 ohms loads. Take special cares about oscillation and phase correlation betwe

17、en channels. 14. Connect the unit to a small speaker, and short the input. Check for any noise. Perform this step with single ended inputs and balanced inputs, independently. 15. Put the unit on a burn-in bench, and let it sit for 24 hours, then readjust bias. Let the unit on the burn- in bench for

18、another 72 hours. 16. Redo steps 11 to 14 before shipping to the customer. PRO-SVR_LEGACY Page 6 of 14 Protection Modes and Indicators The front LED shows the status of the amplifier. When starting up normally, the CA200 will show a FLASHING RED LED for about 15 seconds and if all is normal, the LED

19、 will go SOLID RED. If there is a fault, the LED will go to a FLASHING GREEN LED. The CA200 is equipped, except for some early production models, with four rails protection fuses. In the event that one or more of these fuses would blow, the technician will first need to identify and cure the cause o

20、f failure (please report to troubleshooting guide). When the cause has been identified, disconnect the unit from the system including the AC power. Remove the top cover and look for damaged or burned components. If no other components than the fuses appear to be damaged, the technician can then repl

21、ace the broken fuses with the same value and rating (please report to fuses section). The rail fuses are located on the capacitor board. When replacing fuses, please make sure that the fuse holder are holding the fuses very tightly. A loose fuse holder can translate into distortion on top of the sig

22、nal. PRO-SVR_LEGACY Page 7 of 14 Troubleshooting Guide Symptom Possible cause Unit won t turn on Check connections; Check fuses; Check soft-start circuit; Check relays; Check power supply circuits (positive rail, negative rail, Mosfet supply). Smoked and/or burned components Check for short between

23、components and ground; Check output transistors; Check output relays; Check power supply circuits (positive rail, negative rail, Mosfet supply). Blown fuses Check for short between fuse and ground; Check power supply circuits (positive rail, negative rail, Mosfet supply). No output Check connexions;

24、 Check output relays; Check power supply circuits (positive rail, negative rail, Mosfet supply); Check output transistors. Unit turn into protection Check for smoked and/or burned components; Check power supply circuits (positive rail, negative rail, Mosfet supply); Check source and load; Check prot

25、ection circuit; Check sensor wires between sensor PCB and control PCB; Check outputs transistors and Mosfet drivers. Excessive buzz and/or hum Check electrical lines; Check for a ground loop in the system. Oscillation Check source; Check capacitors on main board; Check 4.7? resistor. Intermittent si

26、gnal Check connections; Replace shield wires. PRO-SVR_LEGACY Page 8 of 14 Output Transistors Testing and Replacement PLEASE NOTE THAT THESE TESTS ARE ONLY EFFECTIVE ON BIPOLAR TRANSISTORS. DO NOT PERFORM THESE TESTS ON MOSFET DEVICES, AS THEY ARE LIKELY TO BECOME SHORT DURING THE TEST. You should ch

27、eck all pin combinaisons, as there is a chance that only one side of the transistor is short. When replacing outputs transistors, the technician should first disconnect both outputs and main board to check if the blown outputs were caused by a faulty component on the amplifier s base. Blown output t

28、ransistors should be replaced by kits, not individually. These kits contains matched transistors for both rails of one channel. When replacing blown output transistors, you must also replace positive and negative Mosfet drivers and bias transistor. Carefully inspect 4.7? resistor and 10? soft start

29、resistor, and replace if necessary. Replace any burnt component or board. Pins : 1 Base 2 Collector 3 Emitter You should have these results, if the transistor is good. 2SC3263 (NPN) Positive lead Negative lead Result B C Conductive B E Conductive C B Infinite C E Infinite E B Infinite E C Infinite 2

30、SA1294 (PNP) Positive lead Negative lead Result B C Infinite B E Infinite C B Conductive C E Infinite E B Conductive E C Infinite PRO-SVR_LEGACY Page 9 of 14 Calibrations and Adjustments Bias adjustment: Note: Bias adjustment should be made without any load connected to the amplifier s output, and n

31、o signal connected to the amplifier s input. 1. Connect a multimeter to R137 leads and set the multimeter to mV scale. 2. Turn trimpot RV102 counterclockwise until it reaches 0?. A click should be heard. 3. Turn on amplifier, and let it warm up for 15 minutes on idle. 4. Adjust trimpot RV102 to get

32、a 14mV reading. 5. Let the amplifier warm up for a 24 hours period with signal and load. 6. Remove signal and load, and reconnect the multimeter, setted to mV scale, to R120 leads. Note the reading. 7. Connect the multimeter to R137, R138, R139 and R140 leads. Note the readings. 8. Input the results

33、 into this formula: (96 mVR137 mVR138 mVR139 mVR140) 4) + mVR137 9. Connect the multimeter to R137 leads, and adjust RV102 to match the reading to the formula result. 10. Results should be around 24mV. DC offset: Note: DC offset adjustment should be made without any load connected to the amplifier s

34、 output, and no signal connected to the amplifier s input. 1. Connect a multimeter to the output binding posts and set the multimeter to mV scale. 2. Adjust trimpot RV101 in order to reach 0mV. It is easier to turn the trimpot turn at a time, and let DC offset stabilize in order to get an accurate r

35、eading. 3. A tolerance of 1mV is acceptable. PRO-SVR_LEGACY Page 10 of 14 Parts List This is not a detailed part list. It is a list of major chassis parts and PCBs. If you need to order a specific part, please contact Classe Audio with the part location, PCB number, and model and serial number of th

36、e unit. If you need a complete PCB, please replace the (x) in the Classe part number with the revision number printed on the board. Parts Description Classe part number B01GX Complete PCB, filter B01GXR(x) B031X Complete PCB, main B031XR(x) B032X Complete PCB, supply B032XR(x) B033X Complete PCB, ca

37、pacitor B033XR(x) PRO-SVR_LEGACY Page 11 of 14 Updates 1. On board B031X, replace R132 and R232 with Classe part number A211-1004. 2. On chassis, install PCB filter (noise elimination module) B01GX, using the following instructions. Noise elimination module: EXTRA PRECAUTIONS SHOULD BE TAKEN WHEN RE

38、PAIRING, MODIFYING,OR TROUBLESHOOTING IN THE POWER SUPPLY AREA. UNIT MUST BE DISCONNECT FROM MAIN SOURCE AND CAPACITORS MUST BE DISCHARGED USING A 100W INCANDESCENT BULB. 1. Remove top cover, handles and faceplate (for more information about mechanical disassembly and reassembly, report to section 2

39、, mechanical assembly) 2. Turn the unit upside down, front of the unit facing you 3. Using a pencil, make a mark at 3” from the back of the unit, 5” from the ride side. Use a punch to guide the drill bit. 4. Using a 1/8” drill bit, drill a hole at this intersection.Clean the area for any metal resid

40、ue. 5. Remove two black screws holding the voltage selector PCB 6. Disconnect the wire from N (neutral). The wire should be yellow or clear. Take time to identify each wire in order to reconnect them properly. 7. Disconnect wire from L (live). The wire should be blue or black. Identify this wire. 8.

41、 Gently strip off the black shrink tubing covering both wires. 9. Cut N wire about 4 inches (10.2cm) from the edge of the lower portion of the supply PCB 10. Connect N wire to one end of the noise filter board, Classe part number B01GXR01. (Fig. 1) 11. Using the wire supplied with the kit, connect t

42、he other end of the noise filter board. (Fig. 1) 12. Fix the board to the chassis, using the screws supplied with the kit. 13. Install the heat shrink tubing supplied on N (new wire) and L wires 14. Reconnect both wires to the voltage selector PCB 15. Clean and spotcheck connections 16. Reassemble a

43、nd test unit carefully for proper operation. PRO-SVR_LEGACY Page 12 of 14 Updates fig. 1 PRO-SVR_LEGACY Page 13 of 14 Fuses EXTRA PRECAUTIONS SHOULD BE TAKEN WHEN REPAIRING, MODIFYING,OR TROUBLESHOOTING IN THE POWER SUPPLY AREA. UNIT MUST BE DISCONNECT FROM MAIN SOURCE AND CAPACITORS MUST BE DISCHAR

44、GED USING A 100W INCANDESCENT BULB. WHEN REPLACING FUSES, PLEASE MAKE SURE THAT THE FUSE HOLDERS ARE HOLDING THE FUSES VERY TIGHTLY. A LOOSE FUSE HOLDER CAN TRANSLATE INTO DISTORTION ON TOP OF THE SIGNAL. Main fuses: For 100 120v units: 10A slo-blo, Classe part number MDA-10A For 220 240v units: 8A

45、slo-blo, Classe part number MDA-8A The main fuse is located at the back of the unit, on the rear panel. Rail fuses: 8A, Classe part number GDB-8A The rail fuses are located on the capacitor boards. Voltage Change EXTRA PRECAUTIONS SHOULD BE TAKEN WHEN REPAIRING, MODIFYING,OR TROUBLESHOOTING IN THE P

46、OWER SUPPLY AREA. UNIT MUST BE DISCONNECT FROM MAIN SOURCE AND CAPACITORS MUST BE DISCHARGED USING A 100W INCANDESCENT BULB. 1. Set the jumper position according to the table below. 2. Replace the varistor, according to new line voltage, following Classe s recommendations. If varistor is not availab

47、le, remove old varistor and leave it empty. Jumper positions, main transformer Mains Jumper 1 Jumper 2 Jumper 3 Varistor 100VAC A E F 221 120VAC A C D 221 220VAC B E - 391 / 441 240VAC B D - 391 / 441 PRO-SVR_LEGACY Page 14 of 14 Remote Interface Information The CA200 can be turned on or off using a simple interface connected to the Remote jack, located at the back of the unit.