Classe-CAV500-pwr-sm维修电路图 手册.pdf

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1、PRO-SVR_LEGACY Page 1 of 13 Date: August 20, 2007 Model Number: CAV-500 Class Audio Inc. Subject: Service manual Class Audio, Inc. 5070 Franois Cusson Lachine, Qubec Canada H8T1B3, RadioFans.CN PRO-SVR_LEGACY Page 2 of 13 Table of Contents Introduction 3 Important Notes on Servicing 3 Ordering Repla

2、cement 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 12 Voltage Change 12 IR Interface Information 13 Schematics 14 The contents of thi

3、s 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 party in any manner whatsoever

4、without prior written permission from Class Audio Incorporated. RadioFans.CN PRO-SVR_LEGACY Page 3 of 13 Introduction Please read this manual carefully before commencing servicing! Only qualified and authorized personnel should attempt to service this product. The lightning flash with arrowhead symb

5、ol, 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 an equilateral triangle is intended to

6、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 serial number. North America Phone: (978

7、) 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 PCBAs. 2.NEVER exchange boards with a di

8、fferent 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 include all required information. Remem

9、ber to quote the serial number of the unit on all replacement part orders and the Class order number when returning defective parts for credit. RadioFans.CN PRO-SVR_LEGACY Page 4 of 13 Block diagrams RadioFans.CN PRO-SVR_LEGACY Page 5 of 13 Start Up Procedure When receiving a unit, an assiduous visu

10、al 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-up procedure

11、, 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, etc. 2. Connec

12、t the unit to a variable transformer, setted to 0Vac. 3. Turn the bias trimpot (RV1) 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. It is connected

13、to the line tab on voltage selector PCB. 5. Slowly raise the voltage to 10Vac, and check positive and negative rails. Check fuses. 6. If one or more supply are not within specifications, return to the troubleshooting guide. 7. Slowly raise voltage until you hear relays click, this point is around 55

14、Vac. 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 transformer. Reconnect only the unit. 11

15、. Report to calibration and adjusments to adjust bias and DC offset. Note that bias can be adjusted to 10mV, 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, and to a source using balanced inputs and single

16、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 between channels. 14. Connect the unit to a small speak

17、er, 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 another 72 hours. 16. Redo steps 11 to 14 before s

18、hipping to the customer. RadioFans.CN PRO-SVR_LEGACY Page 6 of 13 Protection Modes and Indicators The front LED shows the status of the amplifier. When starting up normally, the CAV500 will show a FLASHING RED LED for about 15 seconds and if all is normal, the LED will go SOLID RED. If there is a fa

19、ult, the LED will go to a FLASHING GREEN LED. The CAV500 is equipped, except for some early production models, with ten Mosfet 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 of failure (please report to trouble

20、shooting 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 replace the broken fuses with the same

21、value and rating (please report to fuses section). The Mosfet fuses are located on the control 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 signal. RadioFans.CN PRO-SVR_LEGACY Pa

22、ge 7 of 13 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) Smoked and/or burned components Check for short between components and ground; Check output tr

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

24、output transistors. Unit turn into protection Check for smoked and/or burned components; Check power supply circuits (positive rail, negative rail,); Check source and load; Check protection circuit; Check sensor wires between sensor PCB and control PCB; Check outputs transistors and Mosfet drivers;

25、Perform updates, if necessary. 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 signal Check connections; Replace shield wires. RadioFans.CN PRO-SVR_LEGACY Page 8 of 13

26、 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 check all pin combinaisons, as there is a chance that only one side of the

27、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 transistors should be replaced by kits, not individually. These kits conta

28、ins 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 resistor, and replace if necessary. Replace any burnt component or board.

29、 Pins : 1 Base 2 Collector 3 Emitter You should have these results, if the transistor is good. 2SC3264 (NPN) Positive lead Negative lead Result B C Conductive B E Conductive C B Infinite C E Infinite E B Infinite E C Infinite 2SA1295 (PNP) Positive lead Negative lead Result B C Infinite B E Infinite

30、 C B Conductive C E Infinite E B Conductive E C Infinite RadioFans.CN PRO-SVR_LEGACY Page 9 of 13 Calibrations and Adjustments Bias adjustment: Note: Bias adjustment should be made without any load connected to the amplifier s output, and no signal connected to the amplifier s input. 1. Connect a mu

31、ltimeter to R112 leads and set the multimeter to mV scale. 2. Turn trimpot R104 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 R104 to get a 5mV reading. 5. Let the amplifier warm up for a 24 hours per

32、iod with signal and load. 6. Remove signal and load, and reconnect the multimeter, setted to mV scale, to R112 leads. Note the reading, and readjust if necessary. DC offset: Note: DC offset adjustment should be made without any load connected to the amplifier s output, and no signal connected to the

33、 amplifier s input. On these units, DC offset can t be adjusted. Measure DC offset using a voltmeter connected to the output posts, scale setted to mV. DC offset should be less than 10mV. RadioFans.CN PRO-SVR_LEGACY Page 10 of 13 B Parts List This is not a detailed part list. It is a list of major c

34、hassis 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 the 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 Desc

35、ription Classe part number B1D9X Complete PCB, negative sensor B1D9XR(x) B1DBX Complete PCB, positive sensor B1DBXR(x) B02AX Complete PCB, amplifier B02AXR(x) B1D1X Complete PCB, heatsink, side B1D1XR(x) B1D2X Complete PCB, capacitors B1D2XR(x) B1D3X Complete PCB, speaker posts B1D3XR(x) B1D4X Compl

36、ete PCB, input B1D4XR(x) B1D5X Complete PCB, control B1D5XR(x) B1D6X Complete PCB, voltage selector B1D6XR(x) B1D7X Complete PCB, heatsink, rear B1D7XR(x) B1D8X Complete PCB, soft-start B1D8XR(x) B2E8X Complete PCB, IR sensor B2E8XR(x) B1DAX Complete PCB, switch B1DAXR(x) RadioFans.CN PRO-SVR_LEGACY

37、 Page 11 of 13 Updates 1. On board B1D5X, replace R108 with Classe part number A211-1344. 2. On board B1D5X, replace R203 with Classe part number A211-1360. 3. On board B1D5X, replace R202 with Classe part number A214-1011 4. On board B02AX (5 PCBs), replace R140 and R141 with Classe part number A21

38、1-1455 5. On board B1D4X, replace R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14 and R15 with Classe part number A211-1308. 6. On board B1D1X and B1D7X (5 PCBs), replace R104 with Classe part number 3299X-1-202. 7. On chassis, install capacitors Classe part number A201-1162 on AC poles

39、of the bridge rectifiers (both). 8. On board B02AX, check C115 and C117 for damage and replace them if necessary with Classe part number A201-1018. 9. On board B1D5X, replace PO11XR02 program with 040AR3 and drop rail sensor voltage from 500mV to 275mV 10. Replace shield wires with newer type. 11. A

40、dd jumper between ground point BR102 and ground point R112 on the solder side of board B1D5X. Make it as short as possible to avoid hum and noise. RadioFans.CN PRO-SVR_LEGACY Page 12 of 13 Fuses EXTRA PRECAUTIONS SHOULD BE TAKEN WHEN REPAIRING, MODIFYING,OR TROUBLESHOOTING IN THE POWER SUPPLY AREA.

41、UNIT MUST BE DISCONNECT FROM MAIN SOURCE AND CAPACITORS MUST BE DISCHARGED 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

42、 units: 12A slo-blo, Classe part number MDA-12A For 220 240v units: 10A slo-blo, Classe part number MDA-10A The main fuse is located at the back of the unit, on the rear panel. Control board fuse: 0.50A, Classe part number 225.500 The control board fuse is located on top of the control board (B1D5X)

43、 Mosfet fuses: 0.75A, Classe part number 225.750 The Mosfet fuses are located on top of the control board (B1D5X) Voltage Change 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 D

44、ISCHARGED USING A 100W INCANDESCENT BULB. 1. Set the primary wires of the main transformer as described below. 2. Replace the varistor, according to new line voltage, following Classe s recommendations. If varistor is not available, remove old varistor and leave it empty. 3. Set the jumpers accordin

45、gly on the auxiliary transformer located at the back of the unit on the top main board on the left-hand side of the auxiliary transformer (see tables below) Primary wires, main transformer Mains Z1 Z2 Z3 Z4 Z5 Z6 Z7 Z8 Varistor 120VACYellowGrayBlackBlue- - Orange White 140 220VACGrayBlackYellow-Blue

46、OrangeWhite - 250 240VACGrayYellowBlack - BlueOrangeWhite - 250 Jumpers, auxiliary transformer Mains Position 1 Position 2 Position 3 Position 4 Position 5 120VAC In Out Out Out In 220/240VAC Out Out In Out Out RadioFans.CN PRO-SVR_LEGACY Page 13 of 13 IR Interface Information Press and hold: AMP +

47、LINE 1 = Turns on Amplifier # 1 AMP + LINE 2 = Turns on Amplifier # 2 AMP + LINE 3 = Turns on Amplifier # 3 AMP + BAL 1 = Turns on Amplifier # 4 AMP + BAL 2 = Turns on Amplifier # 5 AMP + BAL 3 = Turns on Amplifier # 6 J3 J2 J1 J0 ADDRESS RC Button Auto ON Note X X X X 0 Amp1 No QC setting X X X Out

48、 1 Amp2 No X X Out X 2 Amp3 No X X Out Out 3 Amp4 No X Out X X 4 Amp5 No X Out X Out 5 Amp6 No X Out Out X 0 Amp1 No X Out Ot Out 0 Amp1 Yes On with AC Out X X X 0 DC No Out X X Out 1 DC No Out X Out X 2 DC No Out X Out Out 3 DC No Out Out X X 4 DC No Out Out X Out 5 DC No Out Out Out X 0 DC No Out

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