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1、PRO-SVR_LEGACY Page 1 of 14 Date: August 22, 2007 Model Number: CAP-151 Class Audio Inc. Subject: Service manual Class Audio, Inc. 5070 Franois Cusson Lachine, Qubec Canada H8T1B3, RadioFans.CN PRO-SVR_LEGACY Page 2 of 14 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 13 IR Interface Information 14 Schematics 15 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 14 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 14 Block diagrams RadioFans.CN PRO-SVR_LEGACY Page 5 of 14 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. Turn t
12、he bias trimpots, counter clockwise until a click is heard. 3. Since there is no soft-start sequence of the CAP-151, it is impossible to use a bypass to perform a slow start up. 4. Connect Main supply, and turn on the unit. 5. If one or more supply are not within specifications, return to the troubl
13、eshooting guide. 6. If every supply is within specifications, report to calibration and adjusments to adjust bias and DC offset. Note that bias can be adjusted to 20mV, and the following tests can be performed before the unit is send to the burn-in bench for a 24 hours warm-up. 7. Connect the unit t
14、o a load, and to a source using single ended inputs. 8. 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. 9. Connect the
15、 unit to a small speaker, and short the input. Check for any noise. 10. 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. 11. Redo steps 7 to 11 before shipping to the customer. RadioFans.CN PRO-SVR_LEGACY Page
16、6 of 14 Protection Modes and Indicators The front LED display shows the status of the amplifier. When starting up normally, the CAP-151 will show a countdown from 20 to 0. However, there is no protection on the CAP-151. The CAP-151 is equipped with four rail protection fuses. In the event that one o
17、r more of these fuses would blow, 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 the unit from the system including the AC power. Remove the top cover and look for damaged or burned com
18、ponents. If no other components than the fuses appear to be damaged, the technician can then replace the broken fuses with the same value and rating (please report to fuses section). The rail fuses are located on the main board. When replacing fuses, please make sure that the fuse holder are holding
19、 the fuses very tightly. A loose fuse holder can translate into distortion on top of the signal. RadioFans.CN 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 circuit
20、s (positive rail, negative rail, Mosfet supply). Smoked and/or burned components Check for short between 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 groun
21、d; Check power supply circuits (positive rail, negative rail, Mosfet supply). No output Check connexions; 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; Che
22、ck power supply circuits (positive rail, negative rail, Mosfet supply); Check source and load; Check protection 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 t
23、he 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 14 Output Transistors Testing and Replacement PLEASE NOTE THAT THESE TESTS ARE ONLY EFFECTIVE ON BIPOLAR TRANSI
24、STORS. 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 transistor is short. When replacing outputs transistors, the technician should first disconnect both outputs
25、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 contains matched transistors for both rails of one channel. When replacing blown output transistors, you must also
26、 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. Pins : 1 Base 2 Collector 3 Emitter You should have these results, if the transistor is good. 2SC3264 (NPN)
27、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 C B Conductive C E Infinite E B Conductive E C Infinite RadioFans.CN PRO-SVR_LEGACY Page 9 of 14 Calibration
28、s 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. Since it is impossible to connect a multimeter to both emitter s resistors in order to measure and adjust bias without di
29、sassembling the heatsink from the chassis, we provided a test point to ease the bias procedure. It is located near the bias trimpot. 2. Connect the positive probe of a millivoltmeter to the test point and the negative probe to the positive speaker post of the channel to be adjusted. 3. Turn trimpots
30、 counterclockwise until it reaches 0?. A click should be heard. 4. Turn on amplifier, and let it warm up for 15 minutes on idle. 5. Adjust trimpot to get a 20mV reading. 6. Let the amplifier warm up for a 24 hours period with signal and load. 7. Remove signal and load, and reconnect the multimeter.
31、8. Readjust to 24mV. 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 sett
32、ed to mV. DC offset should be less than 10mV. RadioFans.CN 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 seria
33、l 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 Description Classe part number B231X Complete PCB, input B231XR(x) B232X Complete PCB, supply B232XR(x) B0F3X Complete PCB, heatsink B0F3XR(x) B0F4X
34、 Complete PCB, amplifier B0F4XR(x) B235X Complete PCB, caps B235XR(x) B236X Complete PCB, preamp B236XR(x) B237X Complete PCB, front panel B237XR(x) RadioFans.CN PRO-SVR_LEGACY Page 11 of 14 Updates 1. On board B0F3X (both PCBs), replace R109 and R110 with Classe part number RN55D6650. 2. On board B
35、232X, replace R5 and R6 with Classe part number A211-1004. 3. Replace shield wires with newer type. RadioFans.CN PRO-SVR_LEGACY Page 12 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 CA
36、PACITORS 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 units: 5A slo-blo, Classe part number GDC-5A F
37、or 220 240v units: 4A slo-blo, Classe part number GDC-4A The main fuse is located at the back of the unit, on the rear panel. On newer models, main fuse is located on supply board (B232X) Rail fuses: 4A, Classe part number GDB-4A The rail fuses are located on the heatsink board (B0F3X). Control boar
38、d fuse: 0.75A, Classe part number 225.750 The control board fuse is located on top of the supply board (B232X) Mosfet fuses: 0.50A, Classe part number 225.500 The Mosfet fuses are centered on the heatsink board (B0F3X) RadioFans.CN PRO-SVR_LEGACY Page 13 of 14 Voltage Change EXTRA PRECAUTIONS SHOULD
39、 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. 1. Set the jumper position according to the table below. 2. Replace the varistor, according to new line voltage,
40、 following Classe s recommendations. If varistor is not available, 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 Jumpers, auxiliary transformer Mains
41、 Position 1 Position 2 Position 3 Position 4 Position 5 100/120VAC In Out Out Out In 220/240VAC Out Out In Out Out RadioFans.CN PRO-SVR_LEGACY Page 14 of 14 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 Am
42、plifier # 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 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
43、 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 Out Out Out 0 DC Yes On with AC RadioFans.CN RadioFans.CN RadioFans.CN RadioFans.CN RadioFans.CN RadioFans.CN RadioFans.CN RadioFans.CN RadioFans.CN RadioFans.CN RadioFans.CN
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