Cambridge Audio Azur 640A Manuel utilisateur

Gallery Court Hankey Place London SE1 4BB UK

Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233

640A Integrated Amplifier

Issue Date: 16th December 2003 (Revised May 2008)

SERVICE MANUAL – AP14676/1

SPECIFICATIONS:

Power Output: 65 watts into 8 Ohms

100 watts into 4 Ohms

Input Impedance: 47k Ohms

Loudspeaker Impedance: 4 to 8 Ohms

Line: 380mV

Phono (using optional phono stage): 1.75mV

Total Harmonic Distortion (into 8 Ohms 80% rated power): 0.005% THD (No weighting) @ 1kHz

0.003% THD (A weighted) @ 1kHz

0.01% THD (No weighting) @ 20Hz - 20kHz

Frequency Response: 5Hz to 50kHz +/- 1dB

Bass: +/- 10dB @100Hz

Treble: +/- 10dB @10kHz

Signal to Noise Ratio (No weighting): 92dB

Slew rate (into 8 ohms): 40V/uS

Max. Power Consumption: 615 watts

Dimensions (mm): 430 x 320 x 100

Weight: 7 kg/15.4 lbs

640A SERVICE MANUAL

TABLE OF CONTENTS

Safety Precautions & Important Notes 3

Amplifier Bias Set-up 4

Main Assembly BOM (Silver Unit) 5 – 7

Input & Tone PCB Schematic (Tone Control) 8

Revised: Input & Tone PCB Schematic (Input Select) 9

Input & Tone PCB Layout (Top Side) 10

Input & Tone PCB Layout (Bottom Side) 11

Input & Tone PCB BOM 12

Front Panel Schematics 13

Front Panel PCB Layout (Top Side) 14

Front Panel PCB Layout (Bottom Side) 15

Front Panel PCB BOM 16

Power Amp Schematic (Power Supply) 17

Power Amp Schematic (Protection) 18

Power Amp Schematic (Left Channel) 19

Power Amp Schematic (Right Channel) 20

Power Amp PCB Layout (Top Side) 21

Power Amp PCB Layout (Bottom Side) 22

Power Amp PCB BOM 23 – 25

Speaker Output Schematic 26

Speaker Output PCB Layout (Top Side) 27

Speaker Output PCB Layout (Bottom Side) 28

Speaker Output PCB BOM 29

Mains Input Schematic 30

Mains Input PCB Layout (Top Side) 31

Mains Input PCB Layout (Bottom Side) 32

Mains Input PCB BOM 33

IC Pin Layout Details 34 – 38

Silver / Black Difference BOM 39

Amended Input Circuit Schematic (Jan 2004) 40

Amended Input Circuit Schematic (March 2005) 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

responsibility for personal injury or property damage resulting therefrom.

6. When servicing, care should be taken to observe the original routing

and dressing of the leads and it should be confirmed that they have been

returned to normal after re-assembly.

Notes on chip component replacement

Never reuse a component that has been removed from a PCB

Notice that the minus side of a tantalum capacitor may be damaged by heat

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.

Alteration or removal of any trademark, copyright, or other notice from this content is prohibited.

Information provided in this document is provided solely for the use of official service agents in

repairing and servicing Audio Partnership PLC products.

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.

AP13133/6

AP PART No. DRAWING NO DESCRIPTION QTY COMMENTS

NEW CAMBRIDGE AMP PACKED UK VERSION 1

AP13074/1 POLY ENDCAP PACKAGING 2

AP13075/1 CARTON PACKAGING W/HANDLE 1 PRINTED TO ARTWORK AP…………

AP136131/1 CAMBRIDGE AUDIO NON-WOVEN BLUE BAG FOR

REMOTE

1 PACK REMOTE CONTROL INSIDE,

CAMBRIDGE NEW STYLE REMOTE COMPLETE 1 MOUNTED INTO POLY ENDCAP PACKING IN

REBATE PROVIDED

AAA ALKALINE BATTERIES 3 FOR REMOTE. PLACE IN INSTRUCTION MANUAL

POLYBAG

PY540 AP13969/1 AMPLIFICATION INSTRUCTION MANUAL 1

AP13933/2 CARTON LABEL (MODEL NO.) UK Silver 1 FOR BOX

SERIAL NUMBER LABEL, BLANK (6.5X35.5mm) 3 1 X REAR PANEL, 1 X BOX, 1 X SHIPPING CARTON

ISO 9002 LABEL 1 AFFIXED TO REAR PANEL ABOVE IEC SOCKET

AP10087/2 "MADE UNDER LICENCE IN PRC" STICKER 1 AFFIXED TO REAR PANEL BELOW IEC SOCKET

POLYBAG 173X260X4C mm 1 FOR INSTRUCTION MANUALOWNERS

CERTIFICATE AND REMOTE BATTERIES

AP13611/1 CAMBRIDGE AUDIO NON-WOVEN BLUE BAG 120mm

HEIGHT

1 PACK AMP UNIT INSIDE

1830mm AC IEC POWER CORD SET BS STANDARD

FUSED 3 AMP

1 MUST BE BS APPROVED

RED TAPE SEAL FOR CAMBRIDGE CARTON 1

NEW CAMBRIDGE AMP UK VERSION ASSEMBLED &

TESTED

FRONT PANEL ASSEMBLY

PY592 AP10209/3 CAMBRIDGE SELECTOR KNOB MK3 3

AP10224/1 CAMBRIDGE KNOB INSERT MK2 3 INSERT INTO SELECTOR KNOBS

PY590 CAMBRIDGE NEW RANGE AMP VOLUME KNOB 1

PY581 AP12740/2 CAMBRIDGE NEW RANGE AMP FRONT PANEL

(PUNCHED AND PRINTED)

1 SCREENED WITH ARTWORK AP13679/2

AP12935/1 CAMBRIDGE NEW RANGE AMP IR LENS 1 GLUED IN PLACE ON THE FRONT PANEL

AP12746/2 CAMBRIDGE NEW RANGE AMP SUB PLATE 1 FASTENEND IN PLACE INBETWEEN THE LEDGES

ON THE FRONT PANEL

AP12931/1 CAMBRIDGE NEW RANGE AMP LIGHTGUIDE 5 FASTEN TO SUBPLATE

M3 X 6 POZI PAN STP SCREW 5 AFFIXES LIGHTGUIDES TO SUBLATE

M3 X 6 C/S POZI MACHINE SCREW 8 FASTEN THE SUB PLATE TO THE FRONT PANEL

AP11782/1 OPUS CONTROL BOX BUTTON 1 POSITION IN PLACE ON THE FRONT PANEL

AP13585/1 CAMBRIDGE NEW RANGE AMP 9mm TAC SWITCH

CUSHION

1 POSITION ON THE SUBPLATE OVER THE POWER

BUTTON CUT AND AFFIX USING ADHESIVE

PROVIDED ON THE CUSHION.

AP12925/1 CAMBRIDGE NEW RANGE AMP 7mm TAC SWITCH

BUTTON

6 POSITION IN PLACE ON THE FRONT PANEL

AP12934/1 CAMBRIDGE NEW RANGE AMP 7mm TAC SWITCH

CUSHION

6 POSITION ON THE SUBPLATE OVER THE POWER

BUTTON CUT AND AFFIX USING ADHESIVE

PROVIDED ON THE CUSHION.

AP12926/2 CAMBRIDGE NEW RANGE AMP 7mm PUSH SWITCH

BUTTON

2 POSITION IN PLACE ON THE FRONT PANEL

CONTROL PCB ASSEMBLY (FRONT PANEL SWITCH

PCB)

M3 X 6 POZI PAN MACHINE SCREW 10 USED FOR FIXING THE CONTROL PCB'S TO THE

SUBPLATE STANDOFF'S

AP13388/3 A600 FRONT PANEL PCB CABLE 1 CONNECTS TO FRONT PANEL SWITCH PCB AND

RUNS ALONG FRONT PANEL CONNECTING THE

SWITCH PCB TO THE POWER SWITCH AND THE

IR PCBS

Cambridge Azur 640A Amplifier (Main Assembly BOM Silver Unit)

AP PART No. DRAWING NO DESCRIPTION QTY COMMENTS

AP13453/2 A600 INPUT PCB TO FRONT PANEL SWITCH PCB 1 ATTACH FRONT PANEL PCB TO INPUT PCB AS

PER DRAWING

CABLE TIE 2.5mm X 100mm 2 ATTACH CABLE LOOM TO SUB PANEL

AP13391/2 A600 VOLUME MOTOR CABLE 1 ATTACH VOLUME POT MOTOR TO FRONT

PANEL SWITCH PCB

AP13394/2 A600 AMP PCB TO FRONT PANEL CONTROL PCB

CABLE

1 ATTACH FRONT PANEL PCB TO AMP PCB AS PER

DRAWING

BOTTOM PANEL ASSEMBLY

AP12734/1 CAMBRIDGE NEW RANGE AMP BOTTOM PANEL 1

PY541 AP12652/2 CAMBRIDGE NEW RANGE FOOT MOULDING 4 POSITION IN PLACE ON BOTTOM PANEL

PY544 AP12883/3 CAMBRIDGE NEW RANGE FOOT PAD 4 AFFIX ON FOOT USING ADHESIVE SURFACE

M3 X 6 PLASTITE POZI PAN 4 AFFIX FEET TO BOTTOM PANEL

12.7mm PLASTIC PCB STANDOFF 9 PUSH SNAP FIT ON BOTTOM PANEL

M3 X 6 POZI PAN TAPTITE SCREW 12 TO AFFIX SUPPORT BRACKETS (POWER AMP

ASSEMBLY) TO BOTTOM PANEL

M4 X 12 POZI PAN MACHINE BOLT 2 FIX THROUGH EARTHING POINT HOLES ON

BOTTOM PANEL

M4 NUT STANDARD 2 USED TO FIX ABOVE BOLTS

M4 LOCK WASHER 2 FOR EARTH BOLTS

M6 X 60 POZI PAN MACHINE BOLT 1 USED TO FIX MAIN TRANSFORMER IN PLACE

THROUGH THE BOTTOM PANEL

AP12629/5 230V 194VA TOROID TRANSFORMER 1

NEOPRENE TRANSFORMER INSULATION WASHERS 2 TO FIT EITHER SIDE OF TRANSFORMER

TRANSFORMER METAL BOTTOM PLATE 1 TO FIT UNDER BOTTOM PLATE ON M6 BOLT

M6 LOCK WASHER 1 PLACE ABOVE TRANSFORMER ON M6 BOLT

TRANSFORMER METAL TOP PLATE 1 PLACE ON TOP OF TRANSFORMER

M6 NUT STANDARD 1 USED TO FIX ABOVE BOLT

INPUT PCB ASSEMBLY 1 FIXES IN THE CORRECT POSITION ONTO THE

PLASTIC PCB STANDOFFS

AP12715/4 BARE INPUT PCB 1

M2.6 X 6 POZI PAN MACHINE SCREW 10 TO AFFIX BOTTOM PANEL TO SIDE, FRONT AND

REAR PANELS

M2.6 X 10 POZI PAN PLASTITE 4 FIX CORNERS OF BOTTOM PANEL TO PLASTIC

INSERTS

SIDE PANEL ASSEMBLY 2

AP12726/1 CAMBRIDGE AUDIO NEW RANGE PRESSED SIDE PANEL

(3 RIDGE)

2 POSITION IN PLACE ON PLASTIC FRONT INSERTS

AP12729/1 CAMBRIDGE AUDIO NEW RANGE FRONT PLASTIC

SUPPORT (3 RIDGE)

2 POSITION AT FRONT WITHIN SIDE PANELS

AP12730/1 CAMBRIDGE AUDIO NEW RANGE REAR PLASTIC

SUPPORT (3 RIDGE)

2 POSITON AT REAR WITHIN SIDE PANELS

M2.6 X 10 C/S POZI PLASTITE 8 TO AFFIX SIDE PANELS TO PLASTIC INSERTS

A600 REAR PANEL ASSEMBLY 1

AP12919/2 CAMBRIDGE AUDIO NEW RANGE AMP REAR PANEL

PRINTED

1 SCREENED WITH ARTWORK AP13665/2 THEN

POSITION ON REAR PLASTIC SUPPORTS

M3 X 10 POZI PAN PLASTITE 4 TO AFFIX REAR PANEL TO REAR PLASTIC INSERTS

M3 X 8 POZI PAN PLASTITE 9 TO FIX SPEAKER TERMINAL PCB AND ALSO FIX

PHONO SOCKETS ON THE INPUT BOARD TO

THE REAR PANEL

M4 X 8 POZI PAN TAPTITE 2 FIXES THE IEC SOCKET MOUNTED ON THE

POWER BOARD TO THE REAR PANEL

M3X12 MACHINE SCREW WITH PLASTIC KNOB AND

EXTERNAL TOOTH ZINC WASHER

1 PHONO GND SCREW ON REAR PANEL

AP PART No. DRAWING NO DESCRIPTION QTY COMMENTS

AP13389/2 A600 AMP PCB TO INPUT PCB POWER CABLE 1 FIT AS PER DRAWING - JST CONNECTORS

AP13393/2 A600 AMP PCB TO MAINS PCB CABLE 1 FIT AS PER DRAWING - JST CONNECTORS

AP13396/2 A600 INPUT PCB TO AMP PCB SIGNAL CABLE 1 FIT AS PER DRAWING - JST CONNECTORS

AP13392/2 A600 AMP PCB TO SPEAKER PCB CABLE 1 FIT AS PER DRAWING - JST CONNECTORS

SELF ADHESIVE CABLE TIE FIXING PAD 19mm X 19mm 3 2X SIDE PANEL, 1X REAR PANEL TO ATTACH

AP13395/1 LOOM TO SIDE OF CHASSIS

CABLE TIE 2.5mm X 100mm 10 (PLEASE FOLLOW EXAMPLE ON

MANUFACTURING SAMPLE UNIT OR USE AS

NECESSARY)

AP13340/1 A600 LIDDING TAPE FOR FRONT AND REAR PANELS 2 FIX TO THE CORRECT SURFACES FOR LID

AP13342/1 A600 LIDDING TAPE FOR SIDE PANELS 2 FIX TO THE CORRECT SURFACES FOR LID

PY542 AP12733/2 CAMBRIDGE AUDIO NEW RANGE TOP PANEL WITH

VENTS

1 POSITIONON TOP OF THE PRODUCT

PY516 M2.6 x 8 M/C Torx Recessed Plated 8 TOP PANEL SCREWS

Cambridge Audio Azur 640A Integrated Amplifier

AP12714/5 Input & Tone PCB Schematic (Tone Control)

330p poly

22k

4k7

8k2

R11

8k2

150n poly

SW1:A

SW-DPDT

DEFEAT

-15V

+15V

R12

10k R13

10k

C10

330p poly

R20

22k

R42

4k7

R43

4k7

R44

8k2

R45

8k2

C11

150n poly

C15

SW1:B

SW-DPDT

DEFEAT

-15V

+15V

R46

10k

R47

10k

-15V

+15V

C16

47n poly

C17

47n poly

C19

47n poly

C20

47n poly

C24

47n poly

C27

47n poly

C32

100u 25V

C33

100u 25V

+15V

-15V

U2:A

NE5532

U2:B

NE5532

U4:A

NE5532

U4:B

NE5532

U5:A

NE5532

U5:B

NE5532

R CH IN

L CH IN

R CH OUT

L CH OUT

HEADPHONE

SW2:A

SW-DPDT

TAPE

SW2:B

SW-DPDT

TAPE

TERMINAL

SPEAKER SWITCHING

RSW1

RSW2

GND

LSW1

LSW2

CN2

HEADPHONE JACK

J5 TERMINAL

J6 TERMINAL

TERMINAL

C18

22p

C21

22p

C28

10u 16V NP

C29

10u 16V NP

C30

10u 16V NP

C31

10u 16V NP

R52

150k

R54

150k

R59

150k

R60

150k

VR1:A

20K MOTORISED DUAL POT

VR1:B

20K MOTORISED DUAL POT

VR4:B

MN20K BALANCE

VR4:A

MN20K BALANCE

VR2:A

B20K LINEAR

VR2:B

B20K LINEAR

VR3:A

B20K LINEAR

VR3:B

B20K LINEAR

R61

220R 3W C

R62

470R 1W C

R63

220R 3W C

R64

470R 1W C

CN3

H6 2.54mm

TO POWER AMP

To enhance viewing, please print to A3 8

Cambridge Audio Azur 640A Integrated Amplifier

AP12714/6 Input & Tone PCB Schematic (Input Select)

(Production change in 2003 - if R48/R56 fail, please refer to

Service Bulletin: TNBC-0006)

CD IN L

TUNER IN L

DVD IN L

AV IN L

CD IN R

TUNER IN R

DVD IN R

AV IN R

PHONO/AUX IN L

PHONO/AUX IN R

TAPE OUT2 R

TAPE OUT1 R

TAPE OUT2 L

TAPE OUT1 L

TAPE MON L

TAPE MONR

PREOUT R

PREOUT L

dat

clk

The Audio Partnership

Gallery Court

Hankey Place

LONDON SE1 4BB

Tel : +44 (0)171 940 2200

Fax : +44 (0)171 940 2233

6CN10:D

QUAD PHONO

3CN11:B

QUAD PHONO

6CN11:D

QUAD PHONO

3CN12:B

QUAD PHONO

4CN10:C

QUAD PHONO

1CN11:A

QUAD PHONO

4CN11:C

QUAD PHONO

1CN12:A

QUAD PHONO

4CN13:C

QUAD PHONO

CN8

HEADER6

PHONO I/O

LK1

6CN13:D

QUAD PHONO

CN7

HEADER6

PHONO PSU

3CN10:B

QUAD PHONO

1CN10:A

QUAD PHONO

U6:A

NE5532

56R

U6:B

NE5532

3CN13:B

QUAD PHONO

6CN12:D

QUAD PHONO

1CN13:A

QUAD PHONO

4CN12:C

QUAD PHONO

U3:A

NE5532

U3:B

NE5532

-15V

+15V

+12V -12V

LK2

R21

220K

R23

220K

R24

100R

R25

100R

R26

100R

R27

220K

R28

220K

R29

100R

R30

100R

R31

100R

R17

220K

R32

220K

R33

220K

R34

100R

R35

100R

R36

100R

R37

100R

R38

100R

R39

100R

R40

220K

R41

220K

+15V

-15V

+30V

47n poly

C12

22p

C13

22p

220K

10k

R10

10k

R14

10k

R15

100K

R16

100K

C25

10u 16V NP

R18

100K

R19

100K

C14

10u 16V NP

R49

100R

R51

100R

R53

100R Pre Only

C26

100n Pre Only

-15V

+15V

+45V

+30V

R55

680R

LCHIN

RCHIN

LCHOUT

RCHOUT

HEADPHONE

VEE 1

L1 2

L2 3

L4 5

L3 4

L-COM1 6

L-COM2 9

L5 7

L6 8

L-COM3 12

L7 10

L8 11

ST 13

VSS 14

DATA

R-COM3

R-COM2

R-COM1

25 R4

VDD

NJU7313

R22

220K

R50

220K

CN4:A

DUAL PHONO

CN4:B

DUAL PHONO

L R

CHASSIS

CN1

H4 2.54mm

CN22

H4 2.54mm

R48

100R

R56

100R

12V Zener 400mW

+12V

-12V

C22

10u 25V

C23

10u 25V

To enhance viewing, please print to A3 9

Cambridge Audio Azur 640A Integrated Amplifier

AP12714/5 Input & Tone PCB Layout (Top Side)

To enhance viewing, please print to A3 10

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