CAMBRIDGEAUDIO 640A free download

File name AP146761CambridgeAzur640AServiceManual-Revised02-05-08.pdf

640A Integrated Amplifier Issue Date: 16th December 2003 (Revised May 2008) SERVICE MANUAL ­ AP14676/1 SPECIFICATIONS: Power Output: Input Impedance: Loudspeaker Impedance: Line: Phono (using optional phono stage): Total Harmonic Distortion (into 8 Ohms 80% rated power): 65 watts into 8 Ohms 100 watts into 4 Ohms 47k Ohms 4 to 8 Ohms 380mV 1.75mV 0.005% THD (No weighting) @ 1kHz 0.003% THD (A weighted) @ 1kHz 0.01% THD (No weighting) @ 20Hz - 20kHz 5Hz to 50kHz +/- 1dB +/- 10dB @100Hz +/- 10dB @10kHz 92dB 40V/uS 615 watts 430 x 320 x 100 7 kg/15.4 lbs Frequency Response: Bass: Treble: Signal to Noise Ratio (No weighting): Slew rate (into 8 ohms): Max. Power Consumption: Dimensions (mm): Weight: Gallery Court Hankey Place London SE1 4BB UK Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233 640A SERVICE MANUAL TABLE OF CONTENTS Safety Precautions & Important Notes Amplifier Bias Set-up Main Assembly BOM (Silver Unit) Input & Tone PCB Schematic (Tone Control) Revised: Input & Tone PCB Schematic (Input Select) Input & Tone PCB Layout (Top Side) Input & Tone PCB Layout (Bottom Side) Input & Tone PCB BOM Front Panel Schematics Front Panel PCB Layout (Top Side) Front Panel PCB Layout (Bottom Side) Front Panel PCB BOM Power Amp Schematic (Power Supply) Power Amp Schematic (Protection) Power Amp Schematic (Left Channel) Power Amp Schematic (Right Channel) Power Amp PCB Layout (Top Side) Power Amp PCB Layout (Bottom Side) Power Amp PCB BOM Speaker Output Schematic Speaker Output PCB Layout (Top Side) Speaker Output PCB Layout (Bottom Side) Speaker Output PCB BOM Mains Input Schematic Mains Input PCB Layout (Top Side) Mains Input PCB Layout (Bottom Side) Mains Input PCB BOM IC Pin Layout Details Silver / Black Difference BOM Amended Input Circuit Schematic (Jan 2004) Amended Input Circuit Schematic (March 2005) 3 4 5­7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 ­ 25 26 27 28 29 30 31 32 33 34 ­ 38 39 40 41 SAFETY PRECAUTIONS & IMPORTANT NOTES 1.Check that the rear of the product indicates the correct supply voltage for you area. 2. The lighting flash with the arrowhead within an equilateral triangle is intended to alert the user or service agent to the presence of dangerous voltages within the product enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. 3. The exclamation point within an equilateral triangle is intended to alert the user or service agent to the presence of important operating and maintenance (Servicing) instructions in the literature accompanying the appliance. 4. This product complies with EEC Low Voltage (73/23/EEC) and Electromagnetic Compatibility (89/336/EEC) Directives when used and serviced in accordance with this manual. For continued compliance all components marked safety and EMC critical must only be replaced by Cambridge Audio approved parts. 5. Any unauthorised design alterations or additions will void the manufacturer's warranty; furthermore the manufacturer cannot accept r