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PRO-SVR_LEGACY    

 

 

Page 3 of 11 

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, within an equilateral triangle, is intended 

to alert the user to the presence of uninsulated dangerous voltage within the 
product’s 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 alert the user to 
the presence of important operating and maintenance (servicing) instructions. 

Classé 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) 664-2870 E-mail: 

[email protected]

Europe

Phone: 44 (0) 1903 221 700 E-mail: 

[email protected]

Asia

Phone: (852) 2790 8903 E-mail: 

[email protected]

Rest of the World 

Phone: (514) 636-6384 E-mail: 

[email protected]

Important Notes on Servicing 

1.

ALWAYS observe ESD precautions when handling electronic modules or PCBAs.  

2.

NEVER exchange boards with a different revision number, unless authorized by Classé.  

3.

ALWAYS use Classé 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.  
Remember to quote the serial number of the unit on all replacement part orders and the Classé order number 
when returning defective parts for credit.   

Summary of Contents for DR-8

Page 1: ...PRO SVR_LEGACY Page 1 of 11 Date August 27 2007 Model Number DR 8 Class Audio Inc Subject Service manual Class Audio Inc 5070 Fran ois Cusson Lachine Qu bec Canada H8T1B3 www classeaudio com...

Page 2: ...ent 8 Calibrations and Adjustments 9 Fuses 10 Voltage Change 10 Schematics 12 The contents of this document as well as the files associated with it contain confidential information that is proprietary...

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 bwgr...

Page 4: ...PRO SVR_LEGACY Page 4 of 11 Block diagrams...

Page 5: ...o 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 troub...

Page 6: ...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 o...

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...

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 repla...

Page 9: ...ot R16 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 resis...

Page 10: ...power switch see fig 1 for details 2 Cut group 2 and separate all the wires at the junction where they joined the single wire going to the AC receptacle at the rear of the amplifier 3 With an ohmmete...

Page 11: ...PRO SVR_LEGACY Page 11 of 11 Voltage Change Fig 1 120v AC wiring Fig 2 220v AC wiring...

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