Cambridge Audio 640A Service Manual
Integrated amplifier
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- User manual (148 pages) ,
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Table of Contents
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Issue Date: 16
December 2003 (Revised May 2008)
SERVICE MANUAL –
SPECIFICATIONS:
Power Output:
Input Impedance:
Loudspeaker Impedance:
Line:
Phono (using optional phono stage):
Total Harmonic Distortion (into 8 Ohms 80% rated power):
Frequency Response:
Bass:
Treble:
Signal to Noise Ratio (No weighting):
Slew rate (into 8 ohms):
Max. Power Consumption:
Dimensions (mm):
Weight:
640A Integrated Amplifier
AP14676/1
Gallery Court Hankey Place London SE1 4BB UK
Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233
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
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Table of Contents
Related Manuals for Cambridge Audio 640A
Summary of Contents for Cambridge Audio 640A
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Page 1: Service Manual
640A Integrated Amplifier Issue Date: 16 December 2003 (Revised May 2008) SERVICE MANUAL – AP14676/1 SPECIFICATIONS: 65 watts into 8 Ohms Power Output: 100 watts into 4 Ohms Input Impedance: 47k Ohms Loudspeaker Impedance: 4 to 8 Ohms 380mV Line: Phono (using optional phono stage): 1.75mV... -
Page 2: Table Of Contents
640A SERVICE MANUAL TABLE OF CONTENTS Safety Precautions & Important Notes Amplifier Bias Set-up Main Assembly BOM (Silver Unit) 5 – 7 Input & Tone PCB Schematic (Tone Control) Revised: Input & Tone PCB Schematic (Input Select) Input & Tone PCB Layout (Top Side) Input &... -
Page 3: Safety Precautions & Important Notes
COPYRIGHT NOTICE. © 2005 Audio Partnership PLC. All rights reserved. Cambridge Audio and Azur are registered trademarks of Audio Partnership PLC. This document may not be reproduced, distributed, transmitted, displayed, published, or broadcast without the express written prior permission of Audio Partnership PLC. -
Page 4: Amplifier Bias Set-Up
Cambridge Audio Azur 640A Amplifier Bias Setup To set the bias on the 640A Amplifier: Measure the voltage across R22 and R100 (Left channel) individually; they should be adjusted using Preset R116 so that the voltage measured on each resistor is greater than 13mV. This procedure should then be repeated for the Right channel by measuring the voltage across R52 and R69 whilst adjusting Preset R68 so that the voltage measured on each resistor is greater than 13mV. -
Page 5: Main Assembly Bom (Silver Unit)
Cambridge Azur 640A Amplifier (Main Assembly BOM Silver Unit) AP13133/6 AP PART No. DRAWING NO DESCRIPTION COMMENTS NEW CAMBRIDGE AMP PACKED UK VERSION AP13074/1 POLY ENDCAP PACKAGING AP13075/1 CARTON PACKAGING W/HANDLE PRINTED TO ARTWORK AP………… AP136131/1 CAMBRIDGE AUDIO NON-WOVEN BLUE BAG FOR... - Page 6 M2.6 X 10 POZI PAN PLASTITE FIX CORNERS OF BOTTOM PANEL TO PLASTIC INSERTS SIDE PANEL ASSEMBLY AP12726/1 CAMBRIDGE AUDIO NEW RANGE PRESSED SIDE PANEL POSITION IN PLACE ON PLASTIC FRONT INSERTS (3 RIDGE) AP12729/1 CAMBRIDGE AUDIO NEW RANGE FRONT PLASTIC...
- Page 7 AP13342/1 A600 LIDDING TAPE FOR SIDE PANELS FIX TO THE CORRECT SURFACES FOR LID PY542 AP12733/2 CAMBRIDGE AUDIO NEW RANGE TOP PANEL WITH POSITIONON TOP OF THE PRODUCT VENTS PY516 M2.6 x 8 M/C Torx Recessed Plated TOP PANEL SCREWS...
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Page 8: Input & Tone Pcb Schematic (Tone Control)
Cambridge Audio Azur 640A Integrated Amplifier SW1:B +15V VR2:A 10u 16V NP B20K LINEAR SW-DPDT DEFEAT 150k +15V 100u 25V 330p poly 47n poly VR1:A U5:A 100u 25V R CH IN U2:B 20K MOTORISED DUAL POT +15V VR4:B -15V VR3:A... -
Page 9: Revised: Input & Tone Pcb Schematic (Input Select)
100n Pre Only 100R Pre Only CHASSIS CN4:B CN4:A DUAL PHONO DUAL PHONO U6:B L CH OUT +30V NE5532 220K 220K 220K 220K 220K 220K 220K 220K +15V 220K 220K 47n poly U6:A HEADER6 HEADER6 R CH OUT PHONO I/O PHONO PSU NE5532 47n poly... -
Page 10: Input & Tone Pcb Layout (Top Side)
Cambridge Audio Azur 640A Integrated Amplifier To enhance viewing, please print to A3 AP12714/5 Input & Tone PCB Layout (Top Side) -
Page 11: Input & Tone Pcb Layout (Bottom Side)
Cambridge Audio Azur 640A Integrated Amplifier To enhance viewing, please print to A3 AP12714/5 Input & Tone PCB Layout (Bottom Side) -
Page 12: Input & Tone Pcb Bom
USED TO FIT OPTIONAL PHONO STAGE M3 NUT BLACK USED TO FIT OPTIONAL PHONO STAGE AP13395/2 640A INPUT PCB TO SPEAKER PCB LOOM CONNECT AS PER DRAWING TO INPUT PCB BEFORE FITTING INPUT PCB TO CHASSIS AP10001/2 CAMBRIDGE AUDIO SCREENING CAN... -
Page 13: Front Panel Schematics
Cambridge Azur 640A Integrated Amplifier CRS1 100n LINK DGND 820R 820R CHANNEL LED CHANNEL LED CHANNEL LED DGND1 CHANNEL LED CHANNEL LED 1N4148 LINK DGND1 CHANNEL LED HEADPHONE FREQ=4MHz strobe 100n clock data 74HC4094 DGND1 RTCC MCLR/VPP 100n CKIN CKOUT... -
Page 14: Front Panel Pcb Layout (Top Side)
Cambridge Azur 640A Integrated Amplifier To enhance viewing, please print to A3 AP12711/9 Front Panel PCB Layout (Top Side) -
Page 15: Front Panel Pcb Layout (Bottom Side)
Cambridge Azur 640A Integrated Amplifier To enhance viewing, please print to A3 AP12711/9 Front Panel PCB Layout (Bottom Side) -
Page 16: Front Panel Pcb Bom
Cambridge Azur Front Panel PCB BOM AP PART DRAWING NO DESCRIPTION DESIGNATOR COMMENTS CONTROL PCB ASSEMBLY (FRONT PANEL) AP12712/8b CONTROL PCB SNAP OFF (FRONT PANEL) 220R 0.25W 1% METAL FILM RESISTOR 820R 0.25W 1% METAL FILM RESISTOR R3,R6,R7 R33 10k 0.25W 1% METAL FILM RESISTOR R2, R4,R5, R27, R28, R29, 33k 0.25W 1% METAL FILM RESISTOR 100n CERAMIC 50/100V 5mm PITCH CAPACITOR... -
Page 17: Power Amp Schematic (Power Supply)
Cambridge Azur 640A Integrated Amplifier +45V WIRE LINK 100n 1N5402 1N5402 47n poly CHASSIS YELLOW YELLOW 1N5402 1N5402 2200uF 2200uF 2200uF 2200uF YELLOW H2 2.54mm PHONO PSU 47n poly ORANGE 2200uF 2200uF 2200uF 2200uF LK18 -45V LINK 7805 7815 +15V... -
Page 18: Power Amp Schematic (Protection)
Cambridge Azur 640A Integrated Amplifier LK26 Speaker short circuit tester LINK +5V-1 Senses a DC resistance of 2 ohms or less PIC TEMP PIC OVERCURRENT/SHORT LK20 4k7 8th digital PIC SPEAKER LINK PIC STANDBY 11k 8th PIC DC 4k7 OpenC... -
Page 19: Power Amp Schematic (Left Channel)
Cambridge Azur 640A Integrated Amplifier 220u 50V +45V2 +45V WIRE3 150R WIRE LINK 150R 220u 50V 150R SAP15N MPSA92/93 MPSA92/93 IN4004 MJE350 10k 8th 100R MPSA42/43 100R 8th 100R 8th 2.2n PPE Bypass (640A only) 47u 50V 10k 8th R100 0.22R 3W... -
Page 20: Power Amp Schematic (Right Channel)
Cambridge Azur 640A Integrated Amplifier +45V3 220u 50V +45V WIRE1 150R WIRE LINK 150R 220u 50V 150R MPSA92/93 MPSA92/93 MJE350 10k 8th MPSA42/43 100R IN4004 2.2n PPE Bypass (640A only) SAP15N 47u 50V 100R 8th 100R 8th 10k 8th 15n poly 0.22R 3W... -
Page 21: Power Amp Pcb Layout (Top Side)
Cambridge Azur 640A Integrated Amplifier To enhance viewing, please print to A3 AP12707/6 Power Amp PCB Layout (Top Side) -
Page 22: Power Amp Pcb Layout (Bottom Side)
Cambridge Azur 640A Integrated Amplifier To enhance viewing, please print to A3 AP12707/6 Power Amp PCB Layout (Bottom Side) -
Page 23: Power Amp Pcb Bom
Cambridge Azur 640A Power Amp PCB BOM AP131336 AP PART DRAWING NO DESCRIPTION DESIGNATOR COMMENTS POWER AMP PCB ASSEMBLY FIXES IN THE CORRECT POSITION ONTO THE PLASTIC PCB STANDOFFS AND SUPPORT BRACKET AP12708/6a BARE POWER AMP PCB 0.22R 3W WIREWOUND RESISTOR... - Page 24 AP PART DRAWING NO DESCRIPTION DESIGNATOR COMMENTS 4.7n CERAMIC 50/100V 5mm PITCH CAPACITOR 15n POLY 50/100V 5mm PITCH CAPACITOR C12, C14 47n POLY 50/100V 5mm PITCH CAPACITOR C19, C20, C32, C40, C55, C56, C57, C58, C67, C68 100n CERAMIC 50/100V 5mm PITCH CAPACITOR C3, C4, C24, C28, C31, C36, C37, C46, C48, C52 10u 35V NON POLAR ELECTROLYTIC...
- Page 25 USED FOR FIXING M3X12 OUTPUT TRANSISTOR FIXING SCREWS M3 NUT BLACK USED FOR FIXING M3X12 OUTPUT TRANSISTOR FIXING SCREWS AP12932/1 CAMBRIDGE AUDIO NEW RANGE AMP HEAT POSITON IN PLACE ON THE SHELF SENSOR BRACKET HEATSINK ASSEMBLY AP13580/1 CAMBRIDGE AUDIO AZUR 640 AMP...
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Page 26: Speaker Output Schematic
Cambridge Azur 640A Integrated Amplifier TERMINAL headphone SPEAKER TEST RL1:C R224 2R2 3W TERMINAL TERMINAL 12V 8A RELAY W201 C202:B To AP13772/1 SPKR 4-WAY C202:D TERMINAL SPKR 4-WAY LK24 TERMINAL RL1:A LINK TERMINAL SPEAKER TEST headphone 1N4002 RIGHT 12V 8A RELAY SPEAKER RELAY H4 2.54mm... -
Page 27: Speaker Output Pcb Layout (Top Side)
Cambridge Azur 640A Integrated Amplifier To enhance viewing, please print to A3 AP12707/6 Speaker Output PCB Layout (Top Side) -
Page 28: Speaker Output Pcb Layout (Bottom Side)
Cambridge Azur 640A Integrated Amplifier To enhance viewing, please print to A3 AP12707/6 Speaker Output PCB Layout (Bottom Side) -
Page 29: Speaker Output Pcb Bom
Cambridge Azur Speaker Output PCB BOM AP131336 AP PART DRAWING DESCRIPTION DESIGNATOR COMMENTS SPEAKER TERMINAL OUTPUT PCB ASSEMBLY POSITION ON REAR PANEL AP12708/6b BARE SPEAKER TERMINAL PCB 2R2 3W WIREWOUND RESISTOR R224, R264 1k 0.125W 1% METAL FILM RESISTOR 10k 0.125W 1% METAL FILM RESISTOR PY536 MPSA13 DARLINGTON NPN TRANSISTOR 1N4004 RECTIFIER DIODE... -
Page 30: Mains Input Schematic
Cambridge Azur 640A Integrated Amplifier RL1:C TRANSFORMER CONNECTIONS TERMINAL 20MM F6.3AL TERMINAL RELAY 20MM T6.3/3.15AL earth BROWN/BLACK 20MM F500mAL TERMINAL TERMINAL RL1:B X1 10n IEC-SOC TERMINAL 20MM F6.3AL TERMINAL TERMINAL TERMINAL RELAY TRANSFORMER X2 680N SUPPRESSION 20MM F500mAL TERMINAL TERMINAL... -
Page 31: Mains Input Pcb Layout (Top Side)
Cambridge Azur 640A Integrated Amplifier To enhance viewing, please print to A3 AP12711/9 Mains Input PCB Layout (Top Side) -
Page 32: Mains Input Pcb Layout (Bottom Side)
Cambridge Azur 640A Integrated Amplifier To enhance viewing, please print to A3 AP12711/9 Mains Input PCB Layout (Bottom Side) -
Page 33: Mains Input Pcb Bom
Cambridge Azur Mains Input PCB BOM AP131336 AP PART DRAWING DESCRIPTION DESIGNATOR COMMENTS MAINS INPUT PCB ASSEMBLY FIXES IN THE CORRECT POSITION ONTO THE PLASTIC PCB STANDOFFS AP12712/8a BARE MAINS INPUT PCB X2 680N SUPPRESSION 1k 0.25W 1% METAL FILM RESISTOR 10k 0.25W 1% METAL FILM RESISTOR 10n CERAMIC X1 Y2 MAINS RATED CAPACITOR C5, C6... -
Page 34: Ic Pin Layout Details
Cambridge Audio Azur 640A/540A Amplifier IC Pin Layouts Control PCB PIC16C57C (U5) BA6218 (U6) - Page 35 74HC4094 (U7)
- Page 36 Input PCB NJU7313 (U1) NE5532 (U2,U3,U4,U5 & U6)
- Page 37 Power PCB NE5534 (U1 & U6) LM393 (U7)
- Page 38 SAP15NO (U3 & U5) SAP15PO (U2 & U4)
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Page 39: Silver / Black Difference Bom
Cambridge Azur 640A Amplifier (Silver-Black Difference BOM) AP13133/6 AP PART DRAWING NO DESCRIPTION COMMENTS CARTON LABEL (MODEL NO.) UK BLACK FOR BOX PY593 CAMBRIDGE SELECTOR KNOB MK3 PY591 CAMBRIDGE NEW RANGE AMP VOLUME KNOB CAMBRIDGE NEW RANGE AMP FRONT PANEL (PUNCHED... -
Page 40: Amended Input Circuit Schematic (Jan 2004)
Cambridge Azur 640A Amplifier 100n Pre Only 100R Pre Only CHASSIS CN4:B CN4:A DUAL PHONO DUAL PHONO U6:B L CH OUT +30V NE5532 220K 220K 220K 220K 220K 220K 220K 220K +15V 220K 220K 47n poly U6:A HEADER6 HEADER6 R CH OUT... -
Page 41: Amended Input Circuit Schematic (March 2005)
Cambridge Azur 640A Amplifier 100n Pre Only 100R Pre Only CHASSIS CN4:B CN4:A DUAL PHONO DUAL PHONO U6:B L CH OUT +30V NE5532 220K 220K 220K 220K 220K 220K 220K 220K +15V 220K 220K U6:A 47n poly HEADER6 HEADER6 R CH OUT...