Classe-CAV180-pwr-sm维修电路图 手册.pdf

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1、PRO-SVR_LEGACY Page 1 of 13 Date: July 17, 2007 Model Number: CAV-180 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 Replace

2、ment 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 this

3、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 wi

4、thout 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 symbol

5、, 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 al

6、ert 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 diff

8、erent 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. Remembe

9、r 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 visual

10、 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. Connect

12、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 to

13、 the line tab on soft start 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 55Vac. Rec

14、heck 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. Report

15、 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 ended in

16、puts, 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 speaker, and

17、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 shipping

18、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 CAV180 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 fault, the

19、 LED will go to a FLASHING GREEN LED. The CAV180 is not equipped with any protection fuses. In the event that the protection is triggered, the technician will first need to identify and cure the cause of failure (please report to troubleshooting guide). When the cause has been identified, disconnect

20、 the unit from the system including the AC power. Remove the top cover and look for damaged or burned components. RadioFans.CN PRO-SVR_LEGACY Page 7 of 13 Troubleshooting Guide Symptom Possible cause Unit won t turn on Check connections; Check fuses; Check soft-start circuit; Check relays; Check pow

21、er supply circuits (positive rail, negative rail) Smoked and/or burned components Check for short between components and ground; Check output transistors; Check power supply circuits (positive rail, negative rail). Blown fuses Check for short between fuse and ground; Check power supply circuits (pos

22、itive rail, negative rail). No output Check connexions; Check output relays; Check power supply circuits (positive rail, negative rail,); Check output transistors. Unit turn into protection Check for smoked and/or burned components; Check power supply circuits (positive rail, negative rail,); Check

23、source and load; Check protection circuit; Check sensor wires between sensor PCB and control PCB; Check outputs transistors and Mosfet drivers; Perform updates, if necessary. Excessive buzz and/or hum Check electrical lines; Check for a ground loop in the system. Oscillation Check source; Check capa

24、citors on main board; Check 4.7? resistor. Intermittent signal Check connections; Replace shield wires. RadioFans.CN PRO-SVR_LEGACY Page 8 of 13 Output Transistors Testing and Replacement PLEASE NOTE THAT THESE TESTS ARE ONLY EFFECTIVE ON BIPOLAR TRANSISTORS. DO NOT PERFORM THESE TESTS ON MOSFET DEV

25、ICES, 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 transistor is short. When replacing outputs transistors, the technician should first disconnect both outputs and main board to check if the blown outputs we

26、re caused by a faulty component on the amplifier s base. Blown output transistors 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 a

27、nd bias transistor. Carefully inspect 4.7? resistor and 10? soft start 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 Conducti

28、ve B E Conductive C B Infinite C E Infinite E B Infinite E C Infinite 2SA1294 (PNP) Positive lead Negative lead Result B C Infinite B E Infinite 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 a

29、djustment should be made without any load connected to the amplifier s output, and no signal connected to the amplifier s input. 1. Connect a multimeter to R5 leads and set the multimeter to mV scale. 2. Turn trimpot RV1 counterclockwise until it reaches 0?. A click should be heard. 3. Turn on ampli

30、fier, and let it warm up for 15 minutes on idle. 4. Adjust trimpot RV1 to get a 10mV 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 R5 leads. Note the reading, and readjust if necessary

31、. DC offset: Note: DC offset adjustment should be made without any load connected to the amplifier s output, and no signal connected to the 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

32、 should be less than 10mV. RadioFans.CN PRO-SVR_LEGACY Page 10 of 13 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 the uni

33、t. 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 B1D9X Complete PCB, negative sensor B1D9XR(x) B1DBX Complete PCB, positive sensor B1DBXR(x) B02AX Complete PCB, amplifier B02AXR(x) B2E1

34、X Complete PCB, capacitors B2E1XR(x) B2E2X Complete PCB, heatsink B2E2XR(x) B2E3X Complete PCB, speaker terminal B2E3XR(x) B2E4X Complete PCB, soft start B2E4XR(x) B2E5X Complete PCB, input B2E5XR(x) B2E7X Complete PCB, control B2E7XR(x) B2E8X Complete PCB, IR sensor B2E8XR(x) B1DAX Complete PCB, sw

35、itch B1DAXR(x) RadioFans.CN PRO-SVR_LEGACY Page 11 of 13 Updates 1. On board B2E2X, replace R1 with Classe part number 3299X-1-202 (5 PCBs). 2. On board B02AX, replace R113 and R103 with following assembly. Use Classe part number A307-1078. Connect the resistor assembly to the exterior pads of R113

36、and R103. 3. On board B2E7X, disconnect the ground wire and connect it to position GND7 on B2E3X PCB. 4. On board B2E2X (5 PCBs), make sure that Q1 and Q2 are part number 2SK79 and 2SK216. They should be mounted on a small aluminium block, which is mounted to the chassis (see following pics). If the

37、y are printed as ECX10N20 and ECX10P20, replace them, using the following guide. Parts needed: G213-1029, Mosfet, x5; G213-1031, Mosfet, x5; G307-1078, Silpad, x10; 385-288, Screw, x10; A306-1048, Lock washer, x10; MS-15795-803, Washer, x20; A306-1020, Shoulder washer, x10; L252XR00, aluminium space

38、r, x10 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. UNIT MUST BE DISCONNECT FROM MAIN SOURCE AND CAPACITORS MUST BE DISCHARGED USING A 100W INCANDESCENT BULB. WHEN REPLACING FUSES, PLEASE MAKE

39、 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 slo-blo, Classe part number MDL-8A The main fuse is located at the ba

40、ck 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 (B2E7X) Voltage Change EXTRA PRECAUTIONS SHOULD BE TAKEN WHEN REPAIRING, MODIFYING,OR TROUBLESHOOTING IN THE POWER SUPPLY AREA. UNIT MUST BE DISCONNE

41、CT FROM MAIN SOURCE AND CAPACITORS MUST BE DISCHARGED 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

42、 leave it empty. 3. Set the jumpers accordingly 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 N1 N2 X1 X2 X3 X4 X7 X8 Varistor 100VAC White Orange GrayYell

43、owBlueBlack - - 140 120VAC White Orange BlueBlackGrayYellow- - 140 220VAC White - - YellowGrayBlackBlueOrange 250 240VAC White - - Black GrayYellowBlueOrange 250 Jumpers, auxiliary transformer Mains Position 1 Position 2 Position 3 Position 4 Position 5 100/120VAC In Out Out Out In 220/240VAC Out Ou

44、t In Out Out RadioFans.CN PRO-SVR_LEGACY Page 13 of 13 IR Interface Information Press and hold: AMP + 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 = Tu

45、rns 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 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 Ou

46、t 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 Out Out Out 0 DC Yes On with AC RadioFans.CN RadioFans.CN B1D9XR02.sch-1 - Tue Jul 17 12:04:49 2007 RadioFans.CN RadioFans.CN B1DBXR02.sch-1 - Tue Jul 17 12:01:57 2007 RadioFans.CN B2E1XR00.sch-1 - Tue Jul 17 12:00:17 2007 RadioFans.CN B2E3XR01.sch-1 - Tue Jul 17 12:00:38 2007 RadioFans.CN B2E4XR00.sch-1 - Tue Jul 17 12:02:42 2007 RadioFans.CN B2E5XR00.sch-1 - Tue Jul 17 12:01:07 2007 RadioFans.CN RadioFans.CN RadioFans.CN B2E8XR00.sch-1 - Tue Jul 17 12:06:43 2007 RadioFans.CN