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PRO-SVR_LEGACY

Page 1 of 10

Date:

August 27, 2007

Model Number:

DR-25 / MODEL 25

Classé Audio Inc.

Subject:

Service manual

Classé Audio, Inc. 5070 François Cusson Lachine, Québec Canada H8T1B3,

www.classeaudio.com

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Summary of Contents for 25

Page 1: ...PRO SVR_LEGACY Page 1 of 10 Date August 27 2007 Model Number DR 25 MODEL 25 Classé Audio Inc Subject Service manual Classé Audio Inc 5070 François Cusson Lachine Québec Canada H8T1B3 www classeaudio com ...

Page 2: ...ent 8 Calibrations and Adjustments 9 Fuses 10 Voltage Change 10 Schematics 11 The contents of this document as well as the files associated with it contain confidential information that is proprietary to Classé 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 withou...

Page 3: ...t parts please contact your nearest service center always quoting the unit serial number North America Phone 978 664 2870 E mail classe bwgroupusa com Europe Phone 44 0 1903 221 700 E mail classe bwgroup com Asia Phone 852 2790 8903 E mail classe bwgroup hk Rest of the World Phone 514 636 6384 E mail cservice classeaudio com Important Notes on Servicing 1 ALWAYS observe ESD precautions when handli...

Page 4: ...PRO SVR_LEGACY Page 4 of 10 Block diagrams ...

Page 5: ...to the troubleshooting guide 6 Slowly raise voltage until you hear relays click this point is around 55Vac Recheck every supply 7 If one or more supply are not within specifications return to the troubleshooting guide 8 Raise voltage to 120Vac Recheck every supply 9 Report to Calibration and adjusments to adjust bias and DC offset Note that bias can be adjusted to 14mV and the following tests can ...

Page 6: ... taken to make sure the unit is OFF before manipulating the connections When a high DC offset is present at the output the protection circuit opens both output relays even if the condition is only present on one channel If the relays are intermittently clicking DC offset should be monitored for a long period of time to make sure DC offset caused that condition and not the protection circuit itself...

Page 7: ...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 Check 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...

Page 8: ...e 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 and bias transistor Carefully inspect 4 7ƻ resistor and 10ƻ soft start resistor and replace if necessary Replace any burnt component or board Pins 1 Base 2 Emit...

Page 9: ...mpot R13 to get 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 one of the emitter resistor leads 7 Readjust R13 to 22mV 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 1 Connect a ...

Page 10: ...units 10A slo blo Classe part number MDA 10A The main fuse is located at the back of the unit on the rear panel 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 DISCHARGED USING A 100W INCANDESCENT BULB 1 Set the jumper position according to the table below 2 Replace...

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