Classé Audio Inc. Date: August 22, 2007 Model Number: CAP-80 / CAP-101 Subject: Service manual Classé Audio, Inc. 5070 François Cusson Lachine, Québec Canada H8T1B3, www.classeaudio.
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 Parts List 10 Updates 11 Fuses 12 Voltage Change 13 IR Interface Information 14 Schematics 15 The contents of this document as well as the files associated with it contain confidential information that is proprietary to Classé Audio Incorporated
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.
Block diagrams PRO-SVR_LEGACY Page 4 of 14
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. 1. Proceed with a post repair visual inspection.
Protection Modes and Indicators The front LED display shows the status of the amplifier. When starting up normally, the CAP80 / CAP101 will show a countdown from 20 to 0. However, there is no protection on the CAP80 / CAP101. The CAP80 / CAP101 is equipped with four rail protection fuses. In the event that one or more of these fuses would blow, the technician will first need to identify and cure the cause of failure (please report to troubleshooting guide).
Troubleshooting Guide Symptom Unit won’t turn on Smoked and/or burned components Blown fuses No output Unit turn into protection Excessive buzz and/or hum Oscillation Intermittent signal PRO-SVR_LEGACY Possible cause Check connections; Check fuses; Check soft-start circuit; Check relays; Check power supply circuits (positive rail, negative rail, supply).
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.
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. Since it is impossible to connect a multimeter to both emitter’s resistors in order to measure and adjust bias without disassembling the heatsink from the chassis, we provided a test point to ease the bias procedure. It is located near the bias trimpot. 2.
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 unit. If you need a complete PCB, please replace the (x) in the Classe part number with the revision number printed on the board.
Updates 1. 2. 3. 4. 5. On board B154X, replace R122, R126, R222 and R226 with Classe part number RN55D7680. On board B154X, replace RV101 and RV201 with Classe part number 3299W-1-202. On board B154X, replace R134 and R234 with Classe part number A211-1004. On board B154X, replace R128, R129, R228 and R229 with Classe part number A211-1001. Replace shield wires with newer type.
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 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: 4A slo-blo, Classe part number GDC-4A For 220 – 240v units: 3.
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 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 leave it empty. 3.
IR Interface Information Press and hold: J3 X X X X X X X X Out Out Out Out Out Out Out Out PRO-SVR_LEGACY AMP AMP AMP AMP AMP AMP J2 X X X X Out Out Out Out X X X X Out Out Out Out J1 X X Out Out X X Out Ot X X Out Out X X Out Out + + + + + + LINE 1 LINE 2 LINE 3 BAL 1 BAL 2 BAL 3 J0 X Out X Out X Out X Out X Out X Out X Out X Out = = = = = = Turns Turns Turns Turns Turns Turns ADDRESS 0 1 2 3 4 5 0 0 0 1 2 3 4 5 0 0 on on on on on on Amplifier Amplifier Amplifier Amplifier Amplifier Amplifier
B154XR08.
