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Table of Contents
- 1 Service Manual
- 2 Table of Contents
- 3 Introduction
- 4 Important Notes on Servicing
- 5 Ordering Replacement Parts
- 6 Block Diagrams
- 7 Start up Procedure
- 8 Protection Modes and Indicators
- 9 Troubleshooting Guide
- 10 Output Transistors Testing and Replacement
- 11 Calibrations and Adjustments
- 12 Fuses
- 13 Voltage Change
- 14 Schematics
- Download this manual
See also:
Owner's Manual
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Table of Contents
Related Manuals for Classe Audio DR 25
Summary of Contents for Classe Audio DR 25
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Page 1: Service Manual
Date: August 27, 2007 Model Number: DR-25 / MODEL 25 Subject: Classé Audio Inc. Service manual Classé Audio, Inc. 5070 François Cusson Lachine, Québec Canada H8T1B3, www.classeaudio.com PRO-SVR_LEGACY Page 1 of 10... -
Page 2: Table Of Contents
Table of Contents Introduction 3 Important Notes on Servicing 3 Ordering Replacement 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 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... -
Page 3: Introduction
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: classe@bwgroupusa.com Europe Phone: 44 (0) 1903 221 700 E-mail: classe@bwgroup.com... -
Page 4: Block Diagrams
Block diagrams PRO-SVR_LEGACY Page 4 of 10... -
Page 5: Start Up Procedure
Start Up Procedure When receiving a unit, an assiduous visual 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, to ensure that everything in the unit is in working condition. -
Page 6: Protection Modes And Indicators
Protection Modes and Indicators The protection circuit on the DR-25 / MODEL 25 is triggered by a high DC offset condition. This is the only protection available on this unit. Therefore, extra precautions should be taken to make sure the unit is OFF before manipulating the connections. -
Page 7: Troubleshooting Guide
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, Mosfet supply). Smoked and/or burned Check for short between components and ground; components Check output transistors; Check output relays;... -
Page 8: Output Transistors Testing And Replacement
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 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. -
Page 9: Calibrations And Adjustments
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 multimeter to one of the emitter resistor leads and set the multimeter to mV scale. 2. -
Page 10: Fuses
INCANDESCENT BULB. 1. Set the jumper position according to the table 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. Jumper positions, main transformer...