Cambridge Audio Azur 840A Service manual

840A

Issue Date: 16th June 2006

________________________________________________________________________________

SERVICE MANUAL

________________________________________________________________________________

SPECIFICATIONS:

Power Output 120W RMS into 8 Ohms at 80% of rated power

0.015% 20kHz

at power

S/N ratio (ref 1W/8 Ohm)

Input Impedances

Power Amp damping factor

>83dB

Input 1 (balanced) 10 kOhm

Tape Input 68 kOhm

> 110 at 1kHz

Minimum power consumption

Bass & Treble controls

Dimensions (H x W x D)

Active (no signal) 70W

Shelving type

Max treble boost/cut +/- 7.5dB at 20Hz

115 x 430 x 385mm

Gallery Court Hankey Place London SE1 4BB UK

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

AP19597/1

1

840A SERVICE MANUAL

TABLE OF CONTENTS

Safety Precautions & Important Notes 4

Exploded Diagram Parts List

Front Panel PCB Layout (Bottom Side)

Front Panel PCB BOM

Front Panel PCB Schematic (Microcontroller & LCD)

Front Panel PCB Schematic (Shift Registers)

Front Panel PCB Layout (Top Side)

Input PCB Schematic (Input Select)

Input PCB Schematic (Input Control)

Input PCB Schematic (Input Amplifier)

Input PCB Board Layout (Top Side)

Input PCB Board Layout (Bottom Side)

7

8

9

10

11

12

13

14

15

16

17

Preamp PCB Schematic (Relay Logic)

Preamp PCB Schematic (Tone Control)

Preamp PCB Schematic (Post Amp)

Preamp PCB Board Layout (Top Side)

Preamp PCB Board Layout (Bottom Side)

19

20

21

22

23

Power Amplifier Schematic (Right Power Supplies & PSU)

Power Amp Right & PSU PCB Board Layout (Top Side)

Power Amp Right & PSU PCB Board Layout (Bottom Side)

26

28

29

Power Amp Schematic (Left Power Supplies)

Power Amp PCB Board Layout (Top Side)

Power Amp PCB Board Layout (Bottom Side)

34

35

36

2

Hub PCB Board Layout (Top Side)

Hub PCB Board Layout (Bottom Side)

40

41

PCB 42-43

Rectifier PCB Board Layout (Top Side)

Rectifier PCB Board Layout (Bottom Side)

45

46

Procedure to upgrade the Control (Pic) Software

Notes

61-62

63

3

SAFETY PRECAUTIONS & IMPORTANT NOTES

1. Check that the rear of the product indicates the correct supply voltage for your 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

COPYRIGHT NOTICE.

© 200

7 Audio Partnership PLC. All rights reserved.

Cambridge Audio and Azur are registered trademarks for 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.

4

Cambridge Audio Azur 840A Amplifier

To enhance viewing, please print to A3

840A Block Diagram

5

12

16

17

6


15

2

9

10

1

6

5

3

15

11

8

7

4


18

5

14

13

840A Exploded Diagram

6


+5V +15V

RS232 RX

+5V

+15V COL 1

SW1

COL 2

SW2

COL 3

SW3

COL 4

SW4

R11

10K

R12

2K2

SW-TACT

INPUT 1

SW-TACT

INPUT 2

R9

22K

Q3

BC337

SERIAL RX 232

Q4

R13

RS232 TX

22K

SERIAL TX 232

SW5 SW6

D3

1N4002

BC337

SW-TACT

INPUT 5

SW9

SW-TACT

INPUT 6

SW10

RS232 RX

RS232 TX

LOGIC GND LOGIC GND

SW-TACT

MODE

SW-TACT

ON/STBY

+5V

+5V

R5

100R

C20

100nF

+5V

C2

100nF

LOGIC GND

C4

10U 16V

LCD DECOUPLE

C7

100nF

LOGIC GND

LOGIC GND

SHIFT REG DECOUPLE

RS

SPEAKER TEST

SHIFT REG ENABLE

1

4a

5a

6a

7a

8a

1a

2a

3a

CN2 2

6

7

4

5

8

1

2

3

15

CONN-8 DUAL BOT

16

LCD DISPLAY CONN

LED BACKLIGHT POWER

2

16

Vss 1

Vdd 2

Vo 3

RS 4

R/W 5

E 6

D0 7

D1 8

D2 9

D3 10

D4 11

D5 12

D6 13

D7 14

LED A 15

LED K 16

1

15

LCD CONN ORIENTATION FROM FRONT

LOGIC GND

LCD DATA SHIFT REGISTER

13

12

11

6

7

4

5

14

Q4

Q5

Q6

Q0

Q1

Q2

Q3

Q7

D

CLK

STB

OE

2

3

1

15

U2

9

10

QS

QS

R15

10K

E

SERIAL DATA

SERIAL CLOCK

SHIFT REG ENABLE

LOGIC GND

+5V

LOGIC GND

C5

C6

22pF

22pF

X1

CRYSTAL

FREQ=20MHz

IR CONTROL

BLOCK

PIC TX

SERIAL IN FROM A-BUS HUB BOARD

HUB DATA

HUB CLOCK 74HC4094

VDD=+5V

VSS=LOGIC GND

BC327-25

Q8

R7

2K2

R2

43R

R3

2K2

PRESET 20K 3296W

2

PR1

R1

22R

Q1

CW

10U 16V

R6

1K1

D4

1N4148

D8

C24

BC327-25

D5 D6

BZX79C2V7 500MW

1K1

R8

Q2

BC337

1N4148 1N4148

R4

4K7

R14

10K

SW-TACT

INPUT 3

SW7

SW-TACT

INPUT 7

SW11

SW-TACT

SPEAKER SELECT

SW-TACT

INPUT 4

SW8

SW-TACT

TAPE MON

POSITION FOR

EXTRA SWITCH spare

U1

18

19

20

15

16

17

9

10

11

12

13

14

1

6

7

8

4

5

2

3

MCLR/VPP

RA0/AN0

RA1/AN1

RA2/AN2

RA3/AN3/VREF

RA4/T0CKI

RA5/AN4/SS

RE0/RD/AN5

RE1/WR/AN6

RE2/CS/AN7

VDD

VSS

OSC1/CLKIN

OSC2/CLKOUT

RCO/T1OSO/T1CKI

RC1/T1OSI/CCP2

RC2/CCP1

RC3/SCK/SCL

RD0/PSP0

RD6/PSP6

RD5/PSP5

RD4/PSP4

RC7/RX/DT

RC6/TX/CK

RC5/SDO

RC4/SDI/SDA

RD3/PSP3

RD1/PSP1 RD2/PSP2

RB7/PGD

RB6/PGC

RB5

RB4

RB3/PGM

RB2

RB1

RB0/INT

VDD

VSS

RD7/PSP7

PIC16F877A

PORT B HAS WEAK PULLUPS

RB4-RB7 HAS INTRPT ON CHANGE

28

27

26

25

24

23

22

21

33

32

31

30

29

36

35

34

40

39

38

37

D7

1N4148

BC337

Q5

R17

10K

0 = BRIGHT

TRISTATE= OFF

1= DIM

ROW 1

ROW 2

ROW 3

CLIP DETECT

OVERLOAD

OVER TEMP

DC OFFSET

MAINS FAIL

PHONES DETECT

SERIAL RX 232

SERIAL TX 232

SERIAL DATA

SERIAL CLOCK

SERIAL STROBE

SERIAL CONTROL OUT

R18

2K2

TRISTATE LED CONTROL

SPEAKER TEST

PHONES DETECT

OVERLOAD

CLIP DETECT

DC OFFSET

OVER TEMP

MAINS FAIL

C23

47R

C19

100n

PIC INPUT EMC CAPS

IR IN (FROM RECEIVER ON PREAMP BOARD)

C1

100n

100n

ON/STBY LED

D2

BLUE LED

C18 C21

100n

C15

100pF

LOGIC GND

C16

100pF

C17

100n

10

11

12

8

9

6

7

3

4

1

2

5

CN1

C22

FFC 12WAY

CONNECTOR TO PREAMP PCB

100n

+5V

C3

10U 16V

LOGIC GND

IR IN (FROM JACK & PHONO ON HUB PCB)

PROGRAM_CLOCK

PROGRAM_DATA

Programming Signals

To ABUS Hub PIC

MCLR HUB

PGM

100N CERAMIC

R16

P2

PAD

P3

PAD

FRONT PANEL GND

LOGIC GND

FRONT PANEL GROUNDING

100N CERAMIC

LOGIC GND

LOGIC GND

C9

10R

R23

RS232 TX

RS232 RX

10R

R24

10R

C10

100n CER

C11

100n CER

LOGIC GND

4

5

1

2

3

ROT1

A SW

B SW

C GND

FIX1

FIX2

NOBLE16ENCODER

FRONT PANEL GND

Q6

BC337

LOGIC GND

R10

PGM

MCLR HUB

PROGRAM_DATA

PROGRAM_CLOCK

LOGIC GND

BLOCK

PIC TX

HUB DATA

HUB CLOCK

9

10

11

12

7

8

5

6

3

4

1

2

13

R19

10K

TX

RX

RS232 GND

IR IN

IR GND

CN3

FFC 13WAY

RS232 & IR CABLE TO HUB PCB

SERIAL IN FROM A-BUS HUB BOARD


AP16369/3 Front Panel PCB Schematic (Microcontroller & LCD)

8


+5V

C8

100nF

C12

100nF

LOGIC GND

SHIFT REG DECOUPLE

C13

100nF

C14

100nF

FROM SHEET 1

SERIAL DATA

SERIAL CLOCK

SERIAL STROBE

SHIFT REG ENABLE

1

15

2

3

U3

D

CLK

STB

OE

Q0

Q1

Q2

Q3

Q4

Q5

Q6

Q7

QS

QS

1

15

2

3

74HC4094

VDD=+5V

VSS=LOGIC GND

U4

D

CLK

STB

OE

Q0

Q1

Q2

Q3

Q4

Q5

Q6

Q7

QS

QS

4

5

6

7

14

13

12

11

9

10

14

13

12

11

6

7

4

5

9

10

74HC4094

VDD=+5V

VSS=LOGIC GND

1

15

2

3

U5

D

CLK

STB

OE

74HC4094

VDD=+5V

VSS=LOGIC GND

Q0

Q1

Q2

Q3

Q4

Q5

Q6

Q7

QS

QS

14

13

12

11

6

7

4

5

9

10

7

8

5

6

3

4

1

2

CN4

FFC 08WAY

5

6

3

4

7

8

1

2

CN5

FFC 08WAY

TO PREAMP BOARD

TO PREAMP BOARD

7

8

5

6

3

4

1

2

CN6

FFC 08WAY

TO PREAMP BOARD

1

15

2

3

U6

D

CLK

STB

OE

74HC4094

VDD=+5V

VSS=LOGIC GND

Q3

Q4

Q5

Q6

Q7

Q0

Q1

Q2

QS

QS

14

13

12

11

6

7

4

5

9

10

7

8

5

6

3

4

1

2

CN7

FFC 08WAY

TO INPUT BOARD


AP16369/3 Front Panel PCB Schematic (Shift Registers)

9


Q3 C9

R9

Q4

Q6

R19

C21

R12

D2

SW10

R15

R14

U6

C3

U5

C12 U4 C8 U3

C1

X1

SW11

C5

C6

SW9

C7

U2

SW2

SW3

SW4

SW1

C4

CN2

C20

R5

C2

SW5

SW6

SW7

SW8

(c) COPYRIGHT Audio Partnership PLC 2005

AP16370/3 AP16370/3

P2

ROT1

R24

R23

P3


AP16369/3 Front Panel PCB Layout (Top Side)

10



AP16369/3 Front Panel PCB Layout (Bottom Side)

11

Cambridge Audio Azur 840A Amplifier Front Panel PCB BOM

AP16372/5

AP No Value Description/Type Qty Component Ident Notes

RESISTORS

10R

22R

43R

47R

100R

1K1

2K2

4K7

10K

22K

CAPACITORS

22pF

100pF

0.25 W 1% Metal Film










3 R10, R23, R24

1 R1

1 R2

1 R16

1 R5

2 R6, R8,

4 R3, R7, R12, R18,

1 R4

5 R11, R14, R15, R17, R19

2 R9, R13

100nF

Ceramic 50V 10% Pitch=5mm



2 C5, C6

2 C15, C16

17

C1, C2, C7, C8, C9, C10, C11,

C12-C14, C17 - C21, C22, C23

3 C3, C4, C24 Note: Low profile electrolytic 10uF

SEMICONDUCTORS

16V Electrolytic Radial (Height

=5.2mm) Pitch=2.5mm

PIC16F877A - I/P PIC Flash Microcontroller 40 pin DIL 1 U1

PY1100 74HC4094

TRANSISTORS

PY219 BC327-25

PY214 BC337-25

DIODES

BLUE LED

1N4148

B Z X 7 9 C 2 V 7

1N4002

Shift register 16 pin DIL

PNP Small Signal TO92

NPN Small Signal TO92

Blue LED 3mm UNI flat top

General purpose diode

Z e n e r d i o d e 2 V 7 4 0 0 m W

General Purpose Rectifier

MISCELLANEOUS

PY1141

PY1142

PY1140

PY1138

P Y 0 4 3

D100-SSV-12

D100-SSV-13

D100-SSV-08

12-WAY FFC reverse-needle type, single-row contacts

13-WAY FFC reverse-needle type, single-row contacts

8-WAY FFC FRONT-PREAMP

CONNS, reverse-needle type singlerow contacts

REB161(9x7)PVB20FHIN

B 1-2-24E

2 4 0 0 0 2 0 2 0 0 0 0 0

2 0 M H z C R Y S T A L

MULTITURN PRESET

20K

Noble ROTARY ENCODER

T a c t s w i t c h

H C 4 9 / 4 H

Side adjust. Foot print 9.5 x 4.5 mm

1

4

5

2

4

1

D2

D4,D5, D6,D7

D 8

1 D3

1

1

4

U2 - U6

Q1, Q8

Q2, Q3, Q4, Q5

CN1

CN3

CN4, CN5, CN6, CN7

1 ROT1

1

1

1

1

S

X

W

1

1

PR1

S W 1 1

Contact Audio Partnership Service

Department

4 0 0 m W D O 3 5 C a s e .

Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer. Please obtain these locally.

12


R57

20K

INPUT 1 L-

INPUT 1 L+

INPUT 1

CN1:B

3

QUAD PHONO

R58

R22

20K

R59

10K

100R

C6

22pF

R60

10K

U14:B

NE5532

6

7

5

C5

22pF

R3

47R

INPUT 2

CN1:D

6

QUAD PHONO

C39

R4

R1

10U NP 35V

1K

C24

47pF

220K

6

5

R45

100K

U3:B

7

NE5532

C40

10U 16V NP

R44

47K

INPUT 3

CN2:B

3

QUAD PHONO

C41

R5

R2

220K

10U NP 35V

1K

C23

47pF

INPUT 4

CN2:D

6

QUAD PHONO

C45

R8

R6

10U NP 35V

220K

1K

C22

47pF

INPUT 5

CN3:B

3

QUAD PHONO

C46

R10

10U NP 35V

R7

220K

1K

C15

47pF

INPUT 6

CN3:D

6

QUAD PHONO

C47

R31

10U NP 35V

R30

220K

1K

C14

47pF

INPUT 7

CN4:B

3

QUAD PHONO

C60

R33

10U NP 35V

R32

220K

1K

C13

47pF

TAPE RETURN LEFT

CN4:D

6

QUAD PHONO

C69

R36

10U NP 35V

1K

R24

220K

C31

47pF

TAPE OUT L

CN5:B

3

QUAD PHONO

6

5

R47

100K

U5:B

7

NE5532

C42

10U 16V NP

R46

47K

6

5

R66

100K

U6:B

7

NE5532

C48

10U 16V NP

R55

47K

6

5

R67

100K

U7:B

7

NE5532

C49

10U 16V NP

R56

47K

6

5

R68

100K

U8:B

7

NE5532

C50

10U 16V NP

R65

47K

6

5

R76

100K

U18:B

7

NE5532

C61

10U 16V NP

R77

47K

LEFT

C77

RL1:B

4

5

RELAY

3

10U 16V NP

HUB 1L

4

RL2:B

5

RELAY

3

HUB 2L

4

RL3:B

5

RELAY

3

HUB 3L

4

RL4:B

5

RELAY

3

HUB 4L

RL5:B

4

5

RELAY

3

HUB 5L

4

RL6:B

5

RELAY

3

HUB 6L

4

RL7:B

5

RELAY

3

HUB 7L

INPUT 1 R+

INPUT 1 R-

INPUT 1 L+

INPUT 1 L-

6

5

U9:B

NE5532

7

R81

100K

C68

10U 16V NP

R82

47K

R9

100R

TAPE RETN L

-15V

C34

47N PE 63V

U2:A

NE5532

1

2

3

+15V

C33

47N PE 63V

C11

10U 16V NP

R35

100K

4

RL8:B

5

RELAY

3

3

4

5

6

1

2

CN10

INPUT ONE RIGHT +

INPUT ONE RIGHT -

GND

GND

INPUT ONE LEFT +

INPUT ONE LEFT -

JST 2,5MM B6B-XH-A

INPUT 1 R-

1

INPUT 1 R+

INPUT 1

CN1:A

2

QUAD PHONO

4

INPUT 2

CN1:C

5

QUAD PHONO

R61

R62

R34

100R

20K

20K

C7

22pF

R63

10K

U14:A

NE5532

2

1

3

22pF

R14

C4

100nF

47R

-15V

R64

10K

C8

+15V

C38

R15

10U NP 35V

1K

R12

220K

C32

47pF

2

3

R42

100k

U3:A

NE5532

1

C37

RIGHT

RL1:C

C71

7

10U 16V NP

-15V

10U 16V NP

C43

47N PE 63V

+15V

R43

47K

8

RELAY

HUB 1R

RL2:C

7

8

RELAY

6

HUB 2R

6

INPUT L

INPUT 3

CN2:A

2

1

QUAD PHONO

C36

10U NP 35V

R13

220K

R16

1K

C27

47pF

4

INPUT 4

CN2:C

5

QUAD PHONO

C51

R17

10U NP 35V

R20

220K

1K

C25

47pF

1

INPUT 5

CN3:A

2

QUAD PHONO

C52

10U NP 35V

R21

220K

R18

1K

C26

47pF

4

INPUT 6

CN3:C

5

QUAD PHONO

C53

R26

10U NP 35V

R28

220K

1K

C28

47pF

INPUT 7

CN4:A

2

1

QUAD PHONO

C62

R27

10U NP 35V

R29

220K

1K

C29

47pF

TAPE RETURN R

CN4:C

5

4

QUAD PHONO

C70

10U NP 35V

R25

220K

R37

1K

C30

47pF

TAPE OUT R

CN5:A

2

1

QUAD PHONO

2

3

R40

100K

-15V

U5:A

NE5532

C35

1

10U 16V NP

C44

47N PE 63V

R41

47K

+15V

RL3:C

7

8

RELAY

6

HUB 3R

2

3

R69

100K

U6:A

NE5532

1

C57

-15V

10U 16V NP

C54

47N PE 63V

+15V

R72

47K

RL4:C

7

8

RELAY

6

HUB 4R

2

3

R70

100K

C58

-15V

U7:A

NE5532

1

10U 16V NP

C55

47N PE 63V

R73

47K

+15V

RL5:C

7

8

RELAY

6

HUB 5R

2

3

R71

100K

C59

-15V

U8:A

NE5532

1

C56

10U 16V NP

47N PE 63V

+15V

R74

47K

7

RL6:C

8

RELAY

6

HUB 6R

C63

-15V

2

3

U18:A

NE5532

1

R78

100K

10U 16V NP

C64

47N PE 63V

+15V

R79

47K

7

RL7:C

8

RELAY

6

HUB 7R

2

3

R75

100K

U9:A

NE5532

1

C66

-15V

TAPE RETN R

10U 16V NP

C67

47N PE 63V

+15V

R80

47K

-15V

U4:A

NE5532

R19

100R

1

C17

47N PE 63V

2

3

47N PE 63V

C16

+15V

C12

10U 16V NP

R38

100K

7

RL8:C

8

RELAY

6

INPUT R

GROUND TERMINAL

J1

TERMINAL

P1

PAD

C3

100nF 100V

R23

100R

C72

100nF 100V

R85

100R

HUB 1L

HUB 2L

HUB 3L

HUB 4L

HUB 5L

HUB 6L

HUB 7L

TAPE RETN L

HUB IN L

-15V

C1 C2

5

6

7

8

9

3

4

1

2

10

11

12

13

14

100n CER

U1

Vss

L-S1

L-S2

L-S3

L-COM1

L-S4

L-S5

L-S6

L-COM2

L-S7

L-S8

L-COM3

ST

GND

TC9163

100n CER

Vdd

R-S1

R-S2

R-S3

R-COM1

R-S4

R-S5

R-S6

R-COM2

R-S7

R-S8

R-COM3

DATA

CLK

24

23

22

21

20

28

27

26

25

19

18

17

16

15

HUB INPUT SWITCHER

+15V

HUB IN R

HUB 1R

HUB 2R

HUB 3R

HUB 4R

HUB 5R

HUB 6R

HUB 7R

TAPE RETN R

HUB IN L

+5V

LOGIC GND

CN6

8

9

10

3

4

1

2

5

6

7

HUB IN L

HUB IN R

GND

GND

+5V POWER TO HUB

SWITCHER DATA

SWITCHER CLOCK

SWITCHER STROBE

FFC 10WAY

INPUT PCB - HUB PCB

PREAMP OUT

CN5:D

6

QUAD PHONO

4

PREAMP OUT

CN5:C

5

QUAD PHONO

PREAMP OUT L

PREAMP OUT R


AP16361/3 Input PCB Schematic (Input Select)

13


INPUT PCB - PREAMP PCB

CN9

3

4

1

2

5

6

TO PREAMP LEFT

TO PREAMP RIGHT

PREAMP OUT L

PREAMP OUT R

JST 2,5MM B6B-XH-A

CN7

6

7

4

5

8

1

2

3

FFC 08WAY

+5V

+9V

+15V

-15V

LOGIC GND

+9V

+5V

C65

100nF 100V

LOGIC GND

CN8

7

8

5

6

3

4

1

2

FFC 08WAY

FROM FRONT PANEL PCB

7

8

5

6

3

4

1

2

U16

IN1

IN2

IN3

IN4

IN5

IN6

IN7

GND

ULN2003A

OUT1

OUT2

OUT3

OUT4

OUT5

OUT6

OUT7

COM

16

15

14

13

12

11

10

9

LOGIC GND +9V

1

RL1:A

2

RELAY

INPUT 1

1

RL2:A

2

RELAY

INPUT 2

1

RL3:A

2

RELAY

INPUT 3

1

RL4:A

2

RELAY

INPUT 4

1

RL5:A

2

RELAY

INPUT 5

1

RL6:A

2

RELAY

INPUT 6

1

RL7:A

2

RELAY

INPUT 7

D1

1N4001

TAPE MONITOR

1

RL8:A

2

RELAY

R11

10K

Q1

BC337

LOGIC GND


AP16361/3 Input PCB Schematic (Input Control)

14


+15V

INPUT L

C21

10U 16V NP

R39

100K

R54

100K

5

6

U2:B

7

NE5532

-15V

R48

1k

C18

22p

C9

1000uF 10V EL

R83

47R

R49

1k

TO PREAMP LEFT

INPUT AMPLIFIER

+ 6 dB

+15V

INPUT R

C20

10U 16V NP

R53

100K

R52

100K

5

6

U4:B

7

NE5532

-15V

R50

1k

C19

22p

C10

1000uF 10V EL

R84

47R

R51

1k

TO PREAMP RIGHT

D2

1N4001


AP16361/3 Input PCB Schematic (Input Amplifier)

15


R34

R64

R

C8

R59

L

R22

R

C37

C43

C40

L

CN1

CN2

R

C35

C44

C42

L R

C57

C54

C48

L

R C

52

C58

C55

C49

C

46

L

R

C59

C56

C50

L

CN3

CN4

R

C63

C64

C61

L

C71

R

C70 C69

L

C66

R TAPE OUT L

C68

CN5

C16

R

PREAMP OUT

L

C20

C67

C10

C9

RL8

C72

C17

R85

C12

C11

P1

RL1 RL2

RELAY DRIVER LOGIC

RL3 RL4 RL5 RL6 RL7

R83

C21

C3

R23

J1

U1

HUB SWITCHER

AP16362/3

AP16362/3


AP16361/3 Input Board PCB Board Layout (Top Side)

16



AP16361/3 Input Board PCB Board Layout (Bottom Side)

17

Cambridge Audio Azur 840A Amplifier Input PCB BOM

A P N o V a l u e D e s c r i p t i o n / T y p e

RESISTORS

4 7 R

1 0 0 R

1 K

1 0 K

2 0 K

4 7 K

0 .

1 2 5 W M e t a l F i l m

0 .


0 .


0 .


0 .


0 .


0 .


0 .


1 0 0 K

2 2 0 K

CAPACITORS

2 2 p F

4 7 p F

4 7 n F

1 0 0 n F

10uF

10uF

1000uF

SEMICONDUCTORS

P Y 4 7 6 T C 9 1 6 3

PY1162 NE5532

A F

P Y 1 1 5 8

P Y 2 1 4

U L N 2 0 0 3 A

TRANSISTORS

B C 3 3 7 2 5

DIODES

1 N 4 0 0 1

MISCELLANEOUS

Q U A D P H O N O S O C K E T

J S T 2 .

5 M M B 6 B X H A

P Y 1 1 4 0 F F C 8 W A Y

P Y 1 1 4 3 F F C 1 0 W A Y

R E L A Y M E 2 9 9 V D C

C e r a m i c 5 0 V

C e r a m i c 5 0 V

1 0 %

1 0 % P

P i t c h = i t c h =

3 m m

3 m m

6 3 V 1 0 % P o l y e s t e r P i t c h = 5 m m

C e r a m i c 5 0 V 1 0 % P i t c h = 5 m m

16V Non Polarised Electrolytic Radial

(5.2mm) Pitch= 2.5mm

35V Non Polarised Electrolytic Radial

(5.2mm) Pitch= 2.5mm

10V Electrolytic Radial (10mm) Pitch=

5mm

A n a l o g u e S w i t c h A r r a y

Low Noise Dual Audio Op-Amp (SMT)

7 D a r il n g t o n D r i v e r s

N P N S m a l l S i g n a l

D i o d e

P H O N O

V e r t i c a l h e a d e r

D 1 0 0 S S V 0 8

D 1 0 0 S S V 1 0

AP16364/3

N o t e s Q t y C o m p o n e n t I d e n t

6

1 4

1 1

6

20

2 0

1 4

5

4

1 3

4

6

1 8

14

2

R 3 , R 1 4 , R 8 3 , R 8 4

R 9 , R 1 9 , R 2 2 , R 2 3 , R 3 4 , R 8 5

R4, R5, R8, R10, R15-R18, R26, R27,

R31, R33, R36, R37, R48-R51

R 1 1 , R 5 9 , R 6 0 ,

R 5 7 , R 5 8 , R 6 1 ,

R 6

R 6 2

3 , R 6 4

R41, R43, R44, R46, R55, R56, R65,

R72-R74, R77, R79, R80, R82

R35, R38-R40, R42, R45, R47, R52-

R54, R66-R71, R75, R76, R78, R81

R1, R2, R6, R7, R12, R13, R20, R21,

R24, R25, R28-R30, R32

C 5 C 8 , C 1 8 , C 1 9

C 1 3 C 1 5 , C 2 2 C 3 2

C16, C17, C33, C34, C43, C44, C54 -

C56, C64, C67

C 1 , C 2 , C 4 , C 3 , C 6 5 , C 7 2

C11, C12, C20, C21, C35, C37 C40,

C42, C48-C50, C57-C59, C61, C63,

C66, C68, C71, C77

C36, C38, C39, C41, C45-C47, C51-

C53, C60, C62, C69, C70

C9, C10

1

5

2

10

1

1

1

2

1

8

U 1

U3, U5-U9, U18, U2, U4, U14

U 1 6

Q 1

D 1

C N 1 C N 5

C N 9 , C N 1 0

C N 7 , C N 8

C N 6

R L 1 R L 8

S O P 2 8 P a c k a g e

SO8 Package

D I L 1 6 P a c k a g e

T O 9 2 P a c k a g e

D O 4 1

Input 1 audio conn, i/o conn

Vertical FFC conn, reverse-needle type

Vertical FFC conn, reverse-needle type

Note: resistors and other 'generic' electronic components are not usually stocked by the manufacturer. Please obtain these locally.

18


C A B L E

A

INPUT PCB - PREAMP PCB

CN11

6

7

4

5

8

1

2

3

+5V

+9V

+15V

-15V

CONN FFC-8

LOGIC GND

C A B L E

C

FRONT PCB - PREAMP PCB

CN2

+5V

8

9

6

7

3

4

1

2

5

10

11

12

CONN FFC-12

SPEAKER TEST

ON/STBY LED

PHONES DETECT

OVERLOAD

CLIP DETECT

DC OFFSET

OVERTEMP

MAINS FAIL

IR RX

SHIFT REGISTER CONNECTOR


CN6

6

7

4

5

1

2

3

8

CONN-H8



CN8

6

7

4

5

1

2

3

8

CONN-H8

+15V

LOGIC GND

+9V

IR RX

6

7

4

5

1

2

3

8

U4

IN1

IN2

IN3

IN4

IN5

IN6

IN7

GND

ULN2003A

OUT1

OUT2

OUT3

OUT4

OUT5

OUT6

OUT7

COM

16

15

14

13

12

11

10

9

LOGIC GND

7

8

5

6

3

4

1

2

U5

IN1

IN2

IN3

IN4

IN5

IN6

IN7

GND

ULN2003A

OUT1

OUT2

OUT3

OUT4

OUT5

OUT6

OUT7

COM

16

15

14

13

12

11

10

9

LOGIC GND

+9V

+9V

1

RL1:A

1

RL2:A

2

RELAY

VOL 1

LOW VOLUME

2

RELAY

VOL 2

+9V

1

2

RL12:A

RELAY

VOL 12

+5V

R104

47R

U10

1

2

3

OPT

GND

+5V

TSOP18 IR RX

IR RECEIVER

TSOP1836/37

LOGIC GND

1

RL3:A

2

RELAY

VOL 3

1

2

RL13:A

RELAY

VOL 13

C19

100n ceramic

1

RL4:A

2

RELAY

VOL 4

C20

10U 16V

1

RL5:A

2

RELAY

VOL 5

1

RL14:A

2

RELAY

VOL 14

HIGH VOLUME

1

RL15:A

2

RELAY

BAL L

1

RL6:A

2

RELAY

VOL 6

1

RL16:A

2

RELAY

BAL R



CN9

7

8

5

6

3

4

1

2

CONN-H8

U7

5

6

3

4

1

2

7

8

IN1

IN2

IN3

IN4

IN5

IN6

IN7

GND

ULN2003A

OUT1

OUT2

OUT3

OUT4

OUT5

OUT6

OUT7

COM

13

12

11

10

9

16

15

14

+9V

LOGIC GND

XD ON/OFF

OUTPUT RELAY A

OUTPUT RELAY B

LOGIC GND

+5V

C27

100n ceramic

C28

LO = MAINS ON

INRUSH RELAY

C29

100n ceramic 100n ceramic

ULN2003 DECOUPLERS

R110

10K

R100

22K

R111

4K7

MAINS ON/OFF RELAY

+5V

R83

22K

Q1

BC337

ON/STBY LED

LOGIC GND

1

RL7:A

2

RELAY

VOL 7

1

RL17:A

2

RELAY

BAL1

R21

430R

R20

430R

ON/STBY LED CONTROL

Q2

BC337

1

RL8:A

2

RELAY

VOL 8

1

RL18:A

2

RELAY

BAL 2

1

RL9:A

2

RELAY

VOL 9

1

RL10:A

2

RELAY

VOL 10

1

RL11:A

2

RELAY

VOL 11

1

RL19:A

2

RELAY

BAL 3

+5V

PHONES R

PHONES L

PHONES GND

8

CN1

7

3

RSW1

RSW2

R

2

4

L

LSW2

5

LSW1

GND

1

HEADPHONE JACK

PHONES DETECT

R19

HI = PHONE JACK OUT

100K

TIP = LEFT

RING = RIGHT

LOGIC GND


AP16365/4 Preamp PCB Schematic (Relay Logic)

19


C38

1N PE 63V

TREBLE

6

ALPHA RD902PF

4

VR1:B

R3

1K1

C1

1N5 PE 63V

R2

1K1

R5

2K2

R1

4K7

R4

2K2

C3

10pF

R15

2K2

CN3

3

4

1

2

5

6

JST 2,5MM B6B-XH-A

BASS

6 4

VR2:B

ALPHA RD902PF

5

6

U1:B

7

NE5532

C2

680n poly

P1

PAD

GROUND REINFORCE

TONE CONTROL

PREAMP OUT L

PREAMP OUT R

C39

TREBLE

3

1N PE 63V

ALPHA RD902PF

1

VR1:A

R8

1K1

C4

1N5 PE 63V

R7

1K1

R10

2K2

R6

4K7

C6

R9

2K2

+15V

10p

ALPHA RD902PF

3

BASS

VR2:A

C5

680n poly

1

3

2

C13

47N PE 63V

U2:A

1

NE5532

C14

47N PE 63V

-15V

R17

2K2

+15V

3

2

C8

47N PE 63V

C36

100pF

2K2

R16

C9

470U 10V EL

SW1:A

R11

47k

SW-DPDT

DEFEAT

NE5532

U1:A

1

C10

470U 10V EL

R13

47k

R22

150R

R97

150R

RL17:B

4

5

RELAY

3

R85

390R

R105

2K2

R87

2K2

2.5 dB 3.75 dB

-15V

RL18:B

4

5

RELAY

3

R88

1K

R86

390R

R89

2K2

5.5 dB

RL19:B

4

5

RELAY

3

RL15:C

7

8

RELAY

RL15:B

4

6

3

5

RELAY

C18

10U NP 16V

R99

47K

5

6

LEFT

BALANCE CONTROL

U9:B

NE5532

7

C21

TO VOLUME LEFT

1000U 10V EL

R103

47K

BALANCE BUFFER

C37

5

6

100pF

R18

2K2

U2:B

7

NE5532

C11

470U 10V EL

R12

47k

C12

470U 10V EL

R14

47k

SW1:B

SW-DPDT

DEFEAT

R90

150R

R98

150R

RL17:C

7

8

RELAY

6

R96

390R

R91

2K2

R93

2K2

+15V

RL18:C

7

8

RELAY

6

R94

1K

RL19:C

7

8

RELAY

6

RL16:C

7

8

RELAY

RL16:B

4

6

3

5

RELAY

C24

10U NP 16V 3

2

R101

47K

RIGHT

-15V

C15

47N PE 63V

U9:A

1

C25

TO VOLUME RIGHT

NE5532

1000U 10V EL

R102

47K

C22

47N PE 63V

R92

390R

R95

2K2


AP16365/4 Preamp PCB Schematic (Tone Control)

20


+15V

C31

47U NP 25V

R106

470R

R107

47K

C35

47N PE 63V

C16

VOL OUT LEFT

10U NP 16V

R77

47K

-15V

3

2

U12:A

1

NE5532

390R

R75

R76

390R

P2

PAD

GROUND REINFORCE

P3

PAD

-15V

POST AMPLIFIER

C33

18 pF

C34

15 pF

C23

100nF ceramic

100nF ceramic

C26

HI = NORMAL OVERTEMP

HI = NORMAL DC OFFSET

HI = NORMAL

HI = NORMAL

OVERLOAD

CLIP DETECT

R81

220R

D3

5V1

LO = ON XD ON/OFF

VOL OUT RIGHT

C17

10U NP 16V

R80

47K

R79

390R

U12:B

5

6

R78

390R

NE5532

7

R82

220R

C32

47U NP 25V

R108

470R

R109

47K

PREAMP OUT L

R84

47K

D1

1N4148

D2

1N4148

LOGIC GND

PREAMP OUT R

CN10

1

2

AUDIO TO L POWER AMP

JST 2.5MM B2B-XH-A

+9V

PREAMP PCB - POWER AMP LEFT PCB CONNS

+5V

LOGIC GND

SPEAKER TEST

MAINS FAIL

OUTPUT RELAY A

OUTPUT RELAY B

PHONES R

PHONES L

PHONES GND

12

13

14

15

9

10

7

8

11

16

1

4

5

2

3

6

CN4

SPEAKER TEST

CLIP

OVERLOAD

DC OFFSET

OVERTEMP

XD ON/OFF

FFC 16WAY

C30

10u 25V

+15V

C7

10u 25V

+5V

+9V

MAINS FAIL IN

CN12

1

2

AUDIO TO R POWER AMP

JST 2.5MM B2B-XH-A

-15V

OPAMP DECOUPLING LOGIC GND

MAINS FAIL IN

MAINS ON/OFF RELAY

INRUSH RELAY

CN5

10

11

8

9

12

5

6

3

4

7

1

2

FFC 12WAY

PREAMP PCB - PSU PCB CONN

PREAMP PCB - POWER AMP RIGHT PCB CONN


AP16365/4 Preamp PCB Schematic (Post Amp)

21


RL1 RL2 RL3

P1

CN12

C32

CN10

R108

R106

R107

R109

C31

D1

R84

D2

D3

CN2

CN4

CN11

CN1

PHONES

C26

C33

R24 R50

C34

R26

R52

RL4

RL5

RL6 RL7

U4

CN6

C27

U12

U10

C20

RL8

C7 C30

RL9 RL10 RL11 RL12 RL13 RL14

C11

C9

R69 R45 R48 R74

C25 R103

P2

R47 R73

C21

C10

C36

U5

C8

U1

C2

C5

VR2

CN5

RL17 RL18

RL19 RL16 RL15 U7

C1

VR1

R3

SW1

P3

C39

R9

7

R2

2

R1

05

C6

C14

R9

3

R9

6

R8

8

R8

6

R8

9

R9

5

U2

R14

C37

C15

U9

C12


AP16365/3 Preamp PCB Layout (Top Side)

22



AP16365/3 Pre-amp PCB Layout (Bottom Side)

23

Cambridge Audio Azur 840A Amplifier Preamp PCB BOM

AP No Value Description/Type

4 7 K

7 5 K

8 2 K

1 6 0 K

2 0 0 K

3 0 0 K

6 2 0 K

8 2 0 K

1 M 2

5 M 1

4 7 R

4 3 0 R

4 7 0 R

1 0 K

2 2 K

4 7 K

1 0 0 K

CAPACITORS

1 0 p F

1 5 p F

1 8 p F

100pF

1nF

4 K 7

5 K 1

1 0 K

2 0 K

3 9 K

RESISTORS

5 R 1

5 1 R

1 5 0 R

3 0 0 R

3 9 0 R

6 2 0 R

1 K

1 K 1

1 K 2

2 K 2

1n5

4 7 n F

100nF

680nF

10uF

10uF

10uF

47uF

470uF

0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .

2 5 W M e t a l F i l m

0 .


0 .


0 .


0 .


0 .


0 .


Qty

8

4

2

2

4

1 0

4

2

2

2

3

2

1 1

4

2

9

2

4

2

2

2

2

2

2

2

2

3

1

2

1

3

2

Component Ident

R 4 7 , R 7 3

R 4 8 , R 7 4

R 2 2 , R 9 0 , R 9 7 , R 9 8

R 4 4 , R 7 0

R85, R86, R92, R96, R75, R78, R76,

R79

R 4 6 , R 7 2

R 3 7 , R 6 3 , R 8 8 , R 9 4

R 2 , R 3 , R 7 , R 8

R 4 5 , R 7 1

R4, R5, R9, R10, R15-R18, R43, R69,

R87, R89, R91, R93, R95, R105

R 1 , R 6 , R 1 1 1

R 3 5 , R 6 1

R 3 8 R 4 2 , R 6 4 R 6 8

R 3 0 , R 3 2 , R 5 6 , R 5 8

R 3 6 , R 6 2

R11-R14, R77, R80, R99, R101, R102,

R103,

R 3 4 , R 6 0

R 2 8 , R 5 4

R 3 3 , R 5 9

R 2 4 , R 5 0

R 3 1 , R 5 7

R 2 9 , R 5 5

R 2 6 , R 5 2

R 2 5 , R 2 7 , R 5 1 , R 5 3

R 2 3 , R 4 9

R 8 1 , R 8 2 , R 1 0 4

R 2 0 , R 2 1

R 1 0 6 , R 1 0 8

R 1 1 0

R 8 3 , R 1 0 0

R 8 4 , R 1 0 7 , R 1 0 9

R 1 9

C e r a m i c

C e r a m i c

5 0 V

5 0 V

1 0 %

1 0 %

P i t c h = 3 m m

P i t c h = 3 m m



Polyester 63V 10%

Pitch=5mm

Polyester 63V 10%

Pitch=5mm

6 3 V 1 0 % P o l y e s t e r P i t c h = 5 m m

Ceramic 50V 10% Pitch= 5mm

Polyester 100V 5% Pitch= 15mm


2.5mm

16V Electrolytic Radial (5.2mm) Pitch=

2.5mm

16V Electrolytic NP Radial (5.2mm)

Pitch= 2.5mm

25V Electrolytic NP Radial (8.4mm)

Pitch= 3.5mm


3.5mm

10V Electrolytic Radial (10.4mm)

Pitch= 5mm

2

6

6

2

2

1

4

2

4

2

2

1

2

1

2

C 3 , C 6

C 3 4

C 3 3

C36, C37

C38, C39

C1, C4

C 8 , C 1 3 , C 1 4 , C 1 5 , C 2 2 , C 3 5

C19, C23, C26-C29

C2, C5

C7, C30

C20

C16, C17, C18,C24,

C31, C32

C9-C12

C21, C25

PY259

P Y 1 1 5 8

P Y 2 1 4

1000uF

SEMICONDUCTORS

NE5532

T S O P 1 8 I R R X

U L N 2 0 0 3 A

TRANSISTORS

B C 3 3 7 2 5

DIODES

1 N 4 1 4 8

Low Noise Dual Audio Op-Amp

I R R e c e i v e r

7 D a r il n g t

M o d u l e o n D r i v e r s

S m a l l S i g n a l D i o d e

4

1

3

2

2

U1, U2, U9, U12

U 1 0

U 4 , U 5 , U 7

Q 1 , Q 2

D 1 , D 2

T O 9 2

Notes

DIL08 Package

R e p l a c e s T S O P 1 8


AP16368/4

Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer.

Please obtain these locally.

24

Cambridge Audio Azur 840A Amplifier Preamp PCB BOM

AP No

PY1156

PY1141

PY1140

PY1157

P Y 6 4 5

Value

B Z X 7 9 C 5 V 1

MISCELLANEOUS

Description/Type

Z e n e r d i o d e 5 V 1 4 0 0 m W

Qty

1 D 3

Component Ident

RD902PF-20B6-30F-B5K-0C ALPHA B5K LINEAR POT

CK-6.35-04 7P

JST 2,5MM B2B-XH-A

JST 2,5MM B6B-XH-A

D100-SSV-12

D100-SSV-08

D100-SSV-16

M

P

E u

2 s h s

9 w i t

9 V c h

D

-

C

D P D T

HEADPHONE JACK SKT

2-way vertical header

6-way vertical header

Flat-film connector 12-way, reverseneedle type

Single row contacts


Single row contacts


Single row contacts

9 V D C R e l a y

2 4 0 2 0 2 0 2 0 0 0 1 0

2 VR1, VR2

1

2

1

CN1

CN10, CN12

CN3

1

2

4

1

1

9

CN2, CN5

CN6, CN8, CN9, CN11

CN4

R

S

L

W

1

1

R L 1 9

Notes

4 0 0 m W D O 3 5 C a s e .

AP16368/4

Retractable 9mm pot. With centre detent.

A s u s e d i n 3 4 0 A



25

MAINS IN

CN3

N

E

L

IEC-SOC

CHASSIS GND

C11

X1 10n

GROUND

C12

X1 10n

J25

BROWN

LIVE

MAINS SWITCH

ON REAR PANEL


MAINS IN

J24

BROWN

LIVE

10A for 115V

6A3 for 230V

F1

T6A3 AL

LVD!

MAINS ON/OFF RELAY

C30 X1 10n

4/5

RL3:B

3/6

ME14FW009HS

INRUSH CONTROL RELAY

C29

X1 10n

4/5

RL4:B

3/6

ME14FW009HS

R78

10R 10W WW

TO MAIN TRANSFORMER

J2

BROWN/BLACK

LIVE

1

MAIN TRANSFORMER

BROWN

230 V

Primary

C13

X2 470N SUPPRESSION

C23

X2 470N SUPPRESSION

ALTERNATIVE POSITIONS FOR

X-CAPS WITH DIFFERENT LEAD PITCHES

+15V

-15V

+9V PSU

CN2

+15V

-15V

0V

+9V

MAINS FAIL IN

MAINS ON/OFF

INRUSH

8

9

10

11

12

FFC 12WAY

4

5

6

7

1

2

3

PSU GND

+5V PSU

D25

MAINS ON/OFF

D9

2

INRUSH CONTROL

2

1N4001

1

ME14FW009HS

1N4001

RL3:A

1

ME14FW009HS

RL4:A

PSU GND

AC

R87

47K

D24

1N4002

MAINS FAIL RECTIFIER

C28

4U7 50V

R79

4K7

PSU PCB

PSU GND

J27

BROWN

NEUTRAL

J26

BROWN

NEUTRAL

J1

BLUE/WHITE

NEUTRAL

J8

TERMINAL

2

1

BLUE

0 V

117 DEG C

STANDBY TRANSFORMER

BROWN

230 V

Primary

J9

TERMINAL

NEUTRAL

2

BLUE

0 V

113 DEG C

RED

5.5A

1 36 V

ORANGE

2 0V

TO POWER AMP SUPPLY LEFT

(SEPARATE PCB)

Secondary

YELLOW

5.5A

3 36 V

GREEN

100 mA

RED

5.5A

ORANGE

2

Secondary

YELLOW

5.5A

3

GREEN

100 mA

RED

500mA

Secondary 1

ORANGE

YELLOW

100mA

GREEN

Secondary 2

VIOLET

100mA

4

1

4

38 V

36 V

0V

36 V

38 V

1 7.5 V

2

3

4

5

0V

17 V

0V

17 V

J13

TERMINAL

GREEN

J6

TERMINAL

F4

20MM T1AL

F7

T1A AL

LVD!

J10

+48V IN

TERMINAL

RED

FROM RECTIFIER BOARD

J11

0V IN

TERMINAL

BLACK

J12

-48V IN

TERMINAL

ORANGE

D23

1N4002

D19

1N4002

J7

TERMINAL

J3

TERMINAL

BLACK

J5

TERMINAL

GREY

F2

20MM T1AL

C34

X1 10n

C37

C35

X1 10n

X1 10n

D21

1N4002

D15

1N4002

C27

C25

15000uF-63V

C26

15000uF-63V

1000uF-50V

R88

33R 1W

+48V R

POWER AMP SUPPLY RIGHT

-48V R

C17

220uF 100V

-51V R

D20

1N4002

D22

1N4002

AC

4700u 16V

C24

R95

2R2 0.5W

1

C20

RELAY SUPPLY

7805

VI VO

MICROCONTROLLER SUPPLY

3

+5V PSU

C16

47u 16V

100nF ceramic

U2

+9V PSU

C31

100nF ceramic

PSU GND

C33

4700u 16V

D16

1N4002

C14

1000U 35V EL

1

U3

7815

VI VO

3

C32

100nF ceramic

OPAMP SUPPLY

+15V

C18

100u 25V

J4

TERMINAL

GREEN

F3

20MM T1AL

C36

X1 10n

D17

1N4002

D18

1N4002

C15

470u 35V

2

VI

U4

7915

VO

3

C22

100nF ceramic

C19

100u 25V

PSU GND

-15V

PSU PCB

+5V IN

MAINS FAIL IN

R96

100K

R81

33K

R77

10K

+310 mV

+600 mV

5

6

7

U1:B

LM393

R80

2K2

MAINS FAIL DETECT

LOW = NORMAL

MAINS FAIL

TO SHEET 1


AP16373/4 Power Amplifier (Right) Power Supplies & PSU PCB Schematic

26


R4

100R

AMP IN RIGHT

JST 2.5MM B2B-XH-A

CN4

1

2

C1

47U 16V

+48V R

R13

2K2

C41

4n7 COG

R97

100K

Q5

MPSA93

D30

1N4148

D31

1N4148

VR2

2

R99

1K

10K

C38

10U NP 16V

R98

100K

-48V R

DC OFFSET NULL

Q7

R6

68R

MPSA43

R2

100R

Q3

MPSA93

C8

47uF 16V

R56

2K2

Q8

MPSA43

Q11

BC337

R7

68R

+5V IN

C21

100nF ceramic

TH1

ZPP22 100DEG

POSITIVE THERMISTOR

850R at 100degC

R68

4K7

R69

10K

+850mV

3

2

R70

1K8

R71

1M

U1:A

1

LM393

HI = NORMAL

OVERTEMP DETECT

100deg C cutout

R74

4K7

R5

100R

Q6

MPSA93

C6

1000U 10V EL

R100

22K

R14

100R

CHASSIS GND

C39

100pF

C7

47uF 35V

R27

2K2

R57

22K

R67

22K

D10

1N4148

D11

1N4148

NFB-R

Q9

MPSA43

D34

1N4148

C10

100pF

R8

2K2

R3

68R

Q4

MPSA93

R10

1K8

R11

1K2

2

VR1

1K

R89

10K

R15

22K

R19

0R1

R91

75K

R18

100R

Q13

2SA1295

R17

100R

R12

18R

Q12

MJE340

C9

47uF 16V

D2

1N4148

Q19

MPSA43

Q1

MJE340

R54

16K

2K7

R93

R33

R1

10R

3K3

R52

1K

D28

12V

NFB-R

R21

0R1

D32

1N4148

D33

1N4148

R23

100R

Q20

MPSA93

D1

1N4148

R53

1K

16K

R55

R94

2K7

D29

12V

R34

3K6

R32

10R

Q2

MJE350

R92

56K

R24

100R

R22

0R1

Q15

2SC3264

Q10

MPSA43

R49

16K

R9

56R

R51

10K

Q25

MPSA43

R90

47K

Q16

2SC3264

R25

0R1

R26

0R1

R20

0R1

Q14

2SA1295

R66

47K

R64

10K

R63

1K

Q26

MPSA43

R84

10K

+5V IN

+5V

LOGIC GND

SPEAKER TEST SENSE

+9V

OVERLOAD

CLIP

OVERTEMP

DC OFFSET

MAINS FAIL

XD ON/OFF

OUTPUT RELAY B

OUTPUT RELAY A

MAINS FAIL IN spare

PHONES GND

PHONES R

CN1

6

7

8

9

10

11

12

13

14

15

16

1

2

3

4

5

FFC 16WAY

LOGIC GND

SPEAKER TEST SENSE

CLIP

DC OFFSET

MAINS FAIL

OUTPUT RELAY B

OUTPUT RELAY A

MAINS FAIL IN

PHONES OUT RIGHT

PREAMP PCB - POWER AMP PCB CONN

R86

47K

XD ON/OFF

+48V R

Q29

MPSA93

R62

150R

Q27

MPSA93

R60

1K1

R61

1K1

R58

470R

R59

470R

Q28

MPSA93

D12

1N4148

D13

1N4148

R65

47K

R30

470R

Q18

MJE340

Q17

2SA1295

R31

0R68

D26

1N5404

C4

220uF 80V

D27

1N5404

R40

220R 3W C

R41

470R 1W C

LEFT IN

J22

+5V IN

R29

10R 3W

L1

1,7U 10A

R28

2R2 3W

SPEAKER TEST SENSE

C2

0u1 POLYESTER

R101

1K

C5

220uF 80V

PHONES OUT RIGHT

R46

4K7

Q24

MPSA93

RL1:C

8

7

RELAY

6

J18

LEFT OUT A

RL2:C

8

7

RELAY

6

J20

LEFT OUT B

RL1:B

5

4

RELAY

3

J14

RIGHT OUT A

RL2:B

5

4

RELAY

3

J16

J15

J17

RIGHT OUT B

GND RIGHT

GND RIGHT

D8

1N4148

R45

47K

R44

47K

R43

47K

Q23

MPSA43

R42

4K7

HI = NORMAL

R48

22K

R47

47K

CLIP

-48V R

+48V R

-48V R

+9V IN

-51V R

R16

10K

OUTPUT RELAY A

LOW = NORMAL

Q35

BC337 BC337

Q32

D14

1N4002

R72

4K7

Q31

BC337

2

RL1:A

1

RELAY

OUTPUT RELAY B

R85

10K

10K

R75

BC337

Q34

1N4002

D7

R82

4K7

Q33

BC337

LOGIC GND

2

RL2:A

1

RELAY

10K

R50

R83

10K

R39

10K

LOW = NORMAL

Q36

10K

R73

BC337

R35

47K

D4

1N4148

D3

C3

22U 50V NP 1N4148

R37

100K

1N4148

D5

Q21

MPSA43

10U 63V EL

C40

Q22

MPSA93

D6

1N4148

R36

4K7

-48V R

DC OFFSET DETECT

R38

47K

HI = NORMAL

DC OFFSET

R76

10K

OVERTEMP

RIGHT

OUTPUT RELAY CONTROL

BC337 MPSA43/93

E B C C B E


AP16373/4 Power Amplifier Right Channel

27



AP16373/3 Power Amp (Right) & PSU PCB Layout (Top Side)

28



AP16373/3 Power Amp Right & PSU PCB Layout (Bottom Side)

29

Cambridge Audio Azur 840A Amplifier Power Amp Right PCB BOM

A P N o D e s c r i p t i o n / T y p e Q t y V a l u e

16K

22K

47K

56K

75K

100K

3 3 R

4 7 0 R

0R1

1 R 5

2R2

1K

1K1

1K2

1K8

2K2

2K7

3K3

3K6

4K7

100K

1M

10R

18R

56R

68R

100R

150R

470R

RESISTORS

910R

2K2

4K7

10K

22K

33K

47K

10K

10R

220R

CAPACITORS

100pF

10nF X1 CAP

100nF

100nF

10uF

10uF

22uF

0.125 W Metal Film

0.125 W Metal Film

0.125 W Metal Film

0.125 W Metal Film

0.125 W Metal Film

0.125 W Metal Film

0.125 W Metal Film

0.125 W Metal Film

0.125 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

1 W M e t a l F i l m

1 W C a r b o n

3 W Wire Wound

3 W W i r e W o u n d

3 W Wire Wound

3 W Wire Wound

3 W Carbon

Ceramic 100V 10% Pitch=

3mm

MEX103K300A02 Pitch

=10mm


5mm

Polyester Pitch= 10mm

16V Electrolytic Radial Non

Polarised (6.4mm) Pitch=

5mm

63V Electrolytic Radial

(5mm diam) Pitch= 3.5mm

50V Non Polarised

Electrolytic Radial (5.2mm)

Pitch= 2.5mm

2 C18, C21

1 C2

C o m p o n e n t I d e n t N o t e s

1 R70

1 R80

5 R36 , R66, R68, R72, R74,

6 R16, R69, R75, R76, R77, R85,

1 R48

1 R81

2 R43, R90,

1 R96

1 R71

2 R1, R32

1 R12

1 R9

3 R3, R6, R7

9 R2, R4-R5, R14, R17, R18, R23, R24,

1 R62

3 R30, R58, R59

6 R52-R53, R63, R80, R99, R101

2 R60, R61

1 R11,

1 R10,

4 R8, R13, R27, R56,

2 R93, R94

1 R34

1 R33

3 R42, R46, R82

8

R39, R50, R51, R64, R73, R83, R84, ,

R89,

3 R49, R54, R55

5 R15, R57, R67, R81, R100

R35, R38, R44, R45, R47, R65, R66,

8

R86

1 R92

1 R91

4 R37, , R97, R98

1 R 8 8

1 R 4 1

6 R19-R22, R25, R26

1 R 3 1

1 R28

S pace off PCB

S pace off PCB

S pace off PCB

S pace off PCB

Inductor damping res.

No need to stand off PCB

1 R29

1 R40

1 C10, C39

3 C11, C12, C20

2 C20, C38

1 C40

1 C3

AP16376/7


30

Cambridge Audio Azur 840A Amplifier Power Amp Right PCB BOM

A P N o V a l u e Q t y

47uF

47uF

220uF

220uF

1000uF

1000uF

15000uF

SEMICONDUCTORS

D e s c r i p t i o n / T y p e


(5mm) Pitch= 2.5mm


(10mm) Pitch= 2.5mm


(12.5mm) Pitch= 5mm


(10.4mm) Pitch= 5mm


(10.4mm) Pitch= 5mm


(13.4mm) Pitch= 5mm


(35.4mm) Pitch= 10mm

3 C1, C8, C9

1 C7

1 C17

2 C4

1 C6

1 C27

2 C25, C26

C o m p o n e n t I d e n t

PY1152 LM393AP

Low-offset dual

Comparator, A-version for low offset voltage

1 U 1

TRANSISTORS

PY1148 MJ E 3 4 0

PY1150 MJ E 3 5 0

PY021 MPSA93

PY013 MPSA43

PY214 BC337-25

PY1149 2SA1295

P Y 1 1 4 7 2 S C 3 2 6 4

DIODES

1N4148

1N4002

1N5404

B Z X 7 9 C 1 2

MISCELLANEOUS

Z P 2 2 1 A 5 0 1 E

08-1950100-150

MULTITURN PRESET

1K

MULTITURN PRESET

10K

SS-7B-1

PY1151 D100-SSV-16

4031-050100-001

T1A AL

N P N D r i v e r T r a n s i s t o r

P N P D r i v e r T r a n s i s t o r

PNP Small Signal

NPN Small Si gnal

NPN Small Si gnal

PNP Power Audio

N P N P o w e r A u d i o

Small Signal Diode

General Purp o s e R e c t i f i e r

General Purp o s e R e c t i f i e r

1 2 V Z e n e r d i o d e 4 0 0 m W

3

2

2

18

D1-D6, D8, D10-D13, D17, D18, D30 -

DIODE-IN4148

D34

D

D

7

2

,

6 ,

D 1

D

4 ,

2 7

D 2 3 , D O 4 1 P a c k a ge

D O 2 7 P a c k a ge Clamp diodes

D 2 8 , D 2 9 4 0 0 m W D O 3 5 C a s e .

P O S I T I V E T H E R M I S T O R

1.7uH 10A INDUCTOR

1

1 L1

T H 1

Top adjust. Footprint 9.5 x

4.5 mm

Top adjust. Footprint 9.5 x

4.5 mm

Wong Feng IEC-SOCKET

FFC CONNECTOR 16-

WAY, Vertical "Reverse needle" type, Single row of contacts

Fuseholder 20mm

FUSE-20MM 1A anti sur ge,

1

1

VR1

VR2

1 CN3

1

1

1

CN1

F7

F7


N o t e s

WMZ12A( )-100S80FLS

AP16376/7

3 Q 1 , Q 1 2 , Q 1 8

1 Q 2

10 Q3-Q6, Q20, Q22, Q24, Q27-Q29

T O 1 2 6

T O 1 2 6

TO92WIDE MPSA92 ma y be used

8 Q7-Q10, Q19, Q21, Q23, Q26, Q25, TO92WIDE MPSA42 ma y be used

9 Q11, Q31-Q36 TO92

3 Q13, Q14, Q17

2 Q 1 5 , Q 1 6

MT200

M T 2 0 0

N o m i n a l o perating temp 100 deg C

10 turns of 1.5mm copper wire, diameter

20mm, length approx 20mm

Set quiescent current.

Insert so adj screw next to R17

DC trim

Insert so adj screw next to Q11


31

Cambridge Audio Azur 840A Amplifier PSU PCB BOM


RESISTORS

2 R 2

10R 10W

8.5X53MM

WireWound

4 K 7

4 7 K

CAPACITORS

10nF X1

Capacitor

100nF

0

K

0

0

.

.

5

N

2

.

2

5

5

W

1 0

W

W

M e

W

M

M

J t a l

1 e t e t

0 a l a l

F i

O l m

F i

F i h m l m l m

B

470nF

4u7

47uF

100uF

470uF

1000uF

4700uF

MEX103K300A02 Pitch =10mm

Ceramic 100V Pitch= 5mm

X2 Suppression CAP

BOX 27.5X13 Pitch= 27.5mm or

BOX 22.5X10 Pitch= 22.5mm


2.5mm


2.5mm


2.5mm


5mm


5mm


5mm

SEMICONDUCTORS

7 8 0 5

7 8 1 5

7 9 1 5

DIODES

1N4002

1 N 4 0 0 1

MISCELLANEOUS

-

5

1 5

1

V o l t

V o l t

1 A

1 A

L i n e a r

L i n e a r

R e g u l a t o r

R e g u l a t o r

5 V o l t 1 A L i n e a r R e g u l a t o r

General Purpose Rectifier

G e n e r a l P u r p o s e R e c t i f i e r

PY1154

T1AL

T6.3 AL or T10A

1A antisurge fuse 20mm (low breaking capacity)

6.3A or 10A antisurge fuse 20mm (low breaking capacity)

4031-050100-

001

4034-000030-

000

F

F u s e h o u s e h o l d e r l d e r

2 c

0 o m v e m r

D100-SSV-12

RELAY ME14F

FFC CONNECTOR 12-WAY, Vertical

"Reverse needle" type, Single row of contacts

RELAY ME14F-9H16S SPST 16A 250 Vac

9V coil

Q t y

1

1

1

1

R 9 5

R 7 8

R 7 9

R 8 7


6

4

1

C29, C30, C34-C37

C20, C22, C31, C32

C13 or C23 dependant on pitch

N o t e s

S p a c e o f f P C B

I n r u s h r e s i s t o r .


2

1

1

1

1

2

C28

C16

C18,C19

C15

C14

C 2 4 , C 3 3 M A X I M U M H E I G H T 2 5 m m

1

1

1

9

2

U 2

U 3

U 4

D15-D22, D24

D 9 , D 2 5

4

1

3

1

F2 - F4

F1

F 1 , 2 , 3 , 4 ,

F 1

1 CN2

2 R L 3 , R L 4

T O

T O

T O

2 2 0

2 2 0

P a c k a g e

P a c k a g e

2 2 0 P a c k a g e

DO41 Package

D O 4 1 P a c k a g e

T6A3 for 230V

T10A for 115V

P l a c e o n m a i n s f u s e h o l d e r F 1

M a i n s & i n r u s h c o n t r o l r e l a y s .

AP16376/7



32


+48V

R4

100R

AMP IN LEFT

JST 2.5MM B2B-XH-A

CN3

1

2

C1

47U 16V

Q5

MPSA93

1N4148

D17

+48V

R13

2K2

C15

4n7 50V COG

R78

100K

D18

1N4148

VR2

2

R80

1K

10K

C20

10U NP 16V

R79

100K

-48V

DC OFFSET NULL

Q7

TH1

POSITIVE THERMISTOR

ZPP22 100DEG

850R at 100degC

R68

4K7

R6

68R

MPSA43

+5V

R2

100R

Q3

MPSA93

R5

100R

Q8

MPSA43

R7

68R

C8

47uF 16V

R56

2K2

Q6

MPSA93

C6

1000U 10V EL

R69

10K

5

6

R71

1M

U1:B

7

HI = NORMAL

LM393

R75

4K7

R70

1K8

OVERTEMP DETECT

100deg C cutout

R14

100R

R81

22K

P1

PAD

CHASSIS GND

C14

100pF

Q11

BC337

C7

47uF 35V

R27

2K2

R57

22K

R67

22K

C18

100n ceramic

D10

1N4148

D11

1N4148

NFB-L

Q9

MPSA43

R8

2K2

R3

68R

Q4

MPSA93

R10

1K8

R11

1K2

2

VR1

1K

D23

1N4148

C10

100pF

R90

100R

D22

R86

100R

1N4002

R15

22K

R16

10K

R19

0R1

R72

75K

R18

100R

Q13

2SA1295

R17

100R

Q1

MJE340

R12

18R

Q12

MJE340

C9

47uF 16V

D2

1N4148

MPSA43

Q19

R54

16K

R74

2K7

R52

1K

R33

3K6

D14

12V

NFB-L

R1

10R

R21

0R1

D24

1N4148

D25

1N4148

R23

100R

MPSA93

Q20

D1

1N4148

R55

16K

R53

1K

D16

12V

R34

3K3

R76

2K7

R32

10R

R22

0R1

Q2

MJE350

R73

56K

Q15

2SC3264

R24

100R

Q16

2SC3264

R25

0R1

R20

0R1

Q14

2SA1295

R26

0R1

R64

10K

R63

1K

R60

1K1

Q29

MPSA93

R66

10K

Q26

MPSA43

R58

470R

R62

150R

Q27

MPSA93

R61

1K1

R59

470R

Q28

MPSA93

R65

47K

D12

1N4148

D13

1N4148

R30

470R

Q17

Q18

MJE340

2SA1295

R31

0R68

Q10

MPSA43

R49

R9

16K

56R

R50

47K

Q25

MPSA43

R51

10K -51V

R82

47K

D21

1N4002

R85

10K

R91

100R

3

2

R87

10R

R89

4K7

1

U1:A

LM393

100K

R88

LO = NO SHORT

SPEAKER SHORT CIRCUIT TEST SYSTEM

+5V

D20

1N4148

Q31

R83

MPSA93

10K

XD ON/OFF

SPEAKER TEST

LOGIC GND

CN2

LOGIC GND

+5V

+9V

SPEAKER TEST

CLIP

OVERLOAD

DC OFFSET

OVERTEMP

XD ON/OFF

MAINS FAIL

OUTPUT RELAY A

OUTPUT RELAY B

PHONES GND

MAINS FAIL IN

PHONES R

PHONES L

13

14

15

16

7

8

9

10

11

12

3

4

5

6

1

2

FFC 16WAY

PHONES L

PREAMP PCB - LEFT POWER AMP PCB CONN

D19 1N4148

D7

1N5404

D9

1N5404

C2

0u1 POLYESTER

C4

220uF 80V

R29

10R 3W

L1

1,7U 10A

R28

2R2 3W

R40

220R 3W C

R41

470R 1W C

PHONES L

C5

220uF 80V

+48V

R42

4K7

R35

47K

CLIP

DC OFFSET

CN1

10

11

12

13

14

15

16

6

7

4

5

8

9

1

2

3

+5V

LOGIC GND

SPEAKER TEST SENSE

+9V

OVERLOAD

CLIP

OVERTEMP

DC OFFSET

MAINS FAIL

XD ON/OFF

OUTPUT RELAY B

OUTPUT RELAY A

MAINS FAIL IN

PHONES GND

PHONES R

FFC 16WAY

LEFT POWER AMP TO

RIGHT POWER AMP CONNECTOR

R37

100K

LOGIC GND

D4

1N4148

D3

C3

22U 50V NP

1N4148

1N4148

D5

LOGIC GND

DC OFFSET DETECT

D6

1N4148

Q21

MPSA43

Q22

MPSA93

R36

4K7

-48V

R46

4K7

J5

LEFT OUT

TERMINAL

J6

J7

TERMINAL

OUTPUT GROUND

TERMINAL

D8

1N4148

R45

47K

50mW

R44

47K

50mW

R43

47K

50mW

Q23

MPSA43

Q24

MPSA93

DC OFFSET

HI = NORMAL

NORMAL = HI

R48

CLIP

22K

R47

47K

210mW

-48V

-48V

LEFT

MJE340,350

BC337 MPSA43/93

E C B

E B C

3 2 1

C B E

Looking at pins


AP16693/5 Power Amplifier Left Channel

33


230 V

1

MAIN TRANSFORMER

BROWN

Primary

0 V 2

BLUE

115 DEG C

RED

5.5A

1 36 V

ORANGE

Secondary

YELLOW

5.5A

GREEN

100 mA

RED

5.5A

2 0V

3 36 V

4

1

38 V

36 V

FROM RECTIFIER BOARD

J1

+48V IN

TERMINAL

RED

J2

0V IN

TERMINAL

ORANGE

J3

-48V IN

TERMINAL

YELLOW

J4

+48V IN

TERMINAL

GREEN

F1

T1A AL

LVD!

D15

1N4002

ORANGE

2 0V

Secondary

YELLOW

5.5A

3 36 V

GREEN

100 mA

4 38 V

TO POWER AMP SUPPLY RIGHT

C12

15000U 63V

C13

15000U 63V

C11

1000uF 50V

R38

33R 1W

+48V

POWER AMP SUPPLY LEFT

-48V

C17

220uF 100V

-51V


AP16693/5 Power Amplifier Left Power Supplies

34


TH1

Q13

GREEN 38V

R28

D7

Q14

R18

R19 R20

Q1

R3

D10

Q15 Q16 Q17

R17

D11

R67

R1

R12

R10

R11

R57

R56

C8

R21

D2

R74

R33

R52

R54

R81

R27

D14

R5

R4

R78

R14

R2

Q5

Q6

C1

R72

R25

R26

R30

R31

R22

R53

Q8

R8

Q7

Q18

R73

R76

D16

R34

C10

R32

R24

D1

R23

D23

D24

D25

R55

R7

Q9

C20

R6

R13

R62

R60

R61

R58

R63

Q25

R9

R15

R49

R16

R51

R44

D8

R64

D12

D13

R65

R35

C3

D3

D4

D5

R37

R36

R42

D6

R50

R68

R69

R70

R71

R75

R82

CN3

R80

R79

R43

R89

R59

R66

D17

D18

R45

R46

R47

R85

R91

Q31

R83

R90

R88

R87

R86

FIX1

R48

D22

D21

D20

D19

C17

D9


AP16693/5 Power Amp PCB Board Layout (Top Side)

35



AP16693/5 Power Amp PCB Board Layout (Bottom Side)

36

Cambridge Audio Azur 840A Amplifier Power Amp Left PCB BOM

A P N o D e s c r i p t i o n / T y p e Q t y

3K3

3K6

10K

16K

22K

47K

56K

75K

100K

150R

470R

1K

1K1

1K2

1K8

2K2

2K7

3 3 R

4 7 0 R

0R1

1 R 5

2R2

1 0 R

RESISTORS

10R

100R

910R

4K7

10K

22K

47K

100K

1M

10R

18R

56R

68R

100R

V a l u e

2 2 0 R

CAPACITORS

100pF

100nF

100nF

10uF

22uF

0.125 W Metal Film

0.125 W Metal Film

0.125 W Metal Film

0.125 W Metal Film

0.125 W Metal Film

0.125 W Metal Film

0.125 W Metal Film

0.125 W Metal Film

0.125 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

0.25 W Metal Film

1 W M e t a l F i l m

1 W C a r b o n P i t c h =

3 W Wire Wound


1 8 m m

3 W Wire Wound


3 W C a r b o n P i t c h = 2 2 .

5 m m


3mm


5mm

Polyester 10% Pitch= 10mm

16V Non Polarised Electrolytic

Radial (5.2mm) Pitch=

2.5mm

50V Non Polarised Electrolytic

Radial (5.2mm) Pitch=

2.5mm

1

1

1

1

4

5

2

4

3

1

1

6

1

1

1

4

2

1

1

4

2

1

3

1

1

1

1

2

3

4

2

3

1

1

6

1

3

10

1

2

1

1

1

C18

C2

C20

C3

C o m p o n e n t I d e n t N o t e s

R87

R86, R90, R91

R70

R36, R42, R46, R68, R75, R89

R69, R83, R85

R48,

R43, R44, R45, R50

R37, R88

R71

R1, R32,

R12

R9

R3, R6, R7

R2, R4, R5, R14, R17, R18, R23,

R24,

R62

R30, R58, R59

R52, R53, R63, R80,

R60, R61

R11,

R10

R8, R13, R27, R56

R74, R76

R34

R33

R16, R51, R64, R66,

R49, R54, R55

R15, R57, R67, R81

R35, R47, R65, R73, R82

R73

R72

R78, R79,

R 3 8

R 4 1

R19-R22, R25, R26

R 3 1

R28

R 2 9



Space off PCB


Inductor damping res.

No need to stand off PCB

Z O B E L R E S .


R 4 0 S p a c e o f f P C B

C10, C14

AP16696/9


37

Cambridge Audio Azur 840A Amplifier Power Amp Left PCB BOM

Q t y A P N o

PY1152

V a l u e D e s c r i p t i o n / T y p e

47uF

47uF

220uF

220uF

1000uF

1000uF

15000uF


(10mm) Pitch= 2.5mm

16V Electrolytic Radial (5mm)

Pitch= 2.5mm


(10.4mm) Pitch= 5mm


(12.5mm) Pitch= 5mm


(10.4mm) Pitch=5 mm


(13.4mm) Pitch= 5mm


(35.4mm) Pitch= 10mm

SEMICONDUCTORS

LM393AP

Dual differential comparator,

A-version for low offset voltage

TRANSISTORS

PY1148 MJE340

P Y 1 1 5 0 M J E 3 5 0

PY021 MPSA93

NPN Power Transistor

P N P P o w e r T r a n s i s t o r

PNP High Voltage

1

3

2

1

1

1

2

1

9

2

1

3

4

1

11

C7

C4, C5

C17

C6

C11

U 1

C o m p o n e n t I d e n t

C1, C8, C9

C12, C13

D I L 0 8

N o t e s

AP16696/9

Q1, Q12, Q18, Q30

Q 2

Q3-Q6, Q20, Q22, Q24, Q27-

Q29, Q31

Q7-Q10, Q19, Q21, Q23, Q25,

Q26

Q 1 1

Q13, Q14, Q17

Q15, Q16

TO126

T O 1 2 6

TO92WIDE MPSA92 may be used

TO92WIDE MPSA42 may be used

T O 9 2

MT200

MT200

PY013 MPSA43

P Y 2 1 4 B C 3 3 7 2 5

PY1149 2SA1295

PY1147 2SC3264

DIODES

1N4148

NPN High Voltage


PNP Power Audio

NPN Power Audio

Small Signal Diode

1 N 5 4 0 4

1N4002

ZENER 12V

400mW

MISCELLANEOUS

G e n e r a l P u p o s e R e c t i f i e r

General Pupose Rectifier

Zener BZX79-C12

PY1151

Z P 2 2 1 A 5 0 1 E

MULTITURN

PRESET 1K

MULTITURN

PRESET 10K

D100-SSV-16

T1A AL

P O S I T I V E T H E R M I S T O R

Top adjust. Footprint 9.5 x 4.5 mm

Top adjust. Footprint 9.5 x 4.5 mm

FFC CONNECTOR 16-WAY,

Vertical "Reverse needle" type,

Single row of contacts

1 Amp 20mm antisurge fuse

4031-050100-001 Fuseholder 20mm

2

18

2

3

D1-D6, D8, D10-D13, D17-

D20, D23-D25

D 7 , D 9

D15, D21, D22

D14, D16

1

1

1

2

1

1

T H 1

VR1

VR2

CN2

F1

F1

D O 2 7

DO41

400mW DO35 Case.

N o m i n a l o p e r a t i n g t e m p 1 0 0 d e g C

Set quiescent current.


DC trim


08-1950100-150 1.7uH 10A INDUCTOR

AP16831/3 To drawing Main heatsink

1

1

L1

Q13, 14, 15, 16, 17

10 turns of 1.5mm copper wire, diameter

20mm, length approx 20mm


38


INPUT 1: BALANCED INPUTS

1+G

GND

-

+

XLR FEMALE

CN8

2

RIGHT

3

INPUT 1 RIGHT +

INPUT 1 RIGHT -

XLR GND

XLR GND

INPUT 1 LEFT +

INPUT 1 LEFT -

CN5

1

2

3

4

5

6

JST 2,5MM B6B-XH-A

CONN TO INPUT PCB

XLR GND

XLR FEMALE

CN7

1+G

GND

-

+

2

LEFT

3

36K

RIGHT

SIG GND

HUB - INPUT PCB CONN

CN3

HUB IN L

HUB IN R

SIG GND

SIG GND

+5V

LOGIC GND

SWITCHER DATA OUT

SWITCHER CLOCK OUT

SWITCHER STROBE OUT

FFC 10WAY

6

7

8

9

10

1

2

3

4

5

LOGIC GND

+5V

R59

47K

R60

47K

36K

+5V

C6

100nF

R12

100R

C10

10uF 16V

C23

100nF

LOGIC GND

MCLR HUB

16

15

4

RA7/OSC1/CLKIN

RA6/OSC2/CLKOUT

RA5/MCLR/THV

RA0/ANO

RA1/AN1

RA2/AN2/VRef

RA3/AN3/COMP1

RA4/T0CKI/CMP2

RB0/INT

RB1/RX/DT

RB2/TX/CK

RB3/CCP1

RB4/PGM

RB5

RB6/T1OSO/T1CKI

RB7/T1OSI

10

11

12

13

6

7

8

9

1

2

17

18

3

U5

PIC16F627-04/P

PROGRAM_DATA

PROGRAM_CLK

HUB CLOCK OUT

HUB DATA OUT

+5V

+5V

STATUS

SIG GND

+24V IN

R56

390K

+24V DETECT

R57

100K

R34

47R

+5V

U6

CA IR DEMODULATOR

36 kHz

D1

TSOP1836 IR RECEIVER

A

IR receiver

K

R44

220R

LOGIC GND

PGM

IR IN

JACK-CKX-3.5-12

CN9

3.5mm JACK

R58

10K

R19

47R

C17

C18

100nF

10uF 16V

LOGIC GND

CA IR DEMODULATOR

C29

100nF

LOGIC GND

C31

10uF 16V

IR

U4

3

2

1

+5V

GND

OPT

IR receiver

TSOP1837 IR RECEIVER

37 kHz

IR IN

3

U7:A

4011

VDD=+5V

1

2

LOGIC GND

1

IR IN

CN10:A

AV2-8,4-14/EC

R45

2

220R

1

U8

LOGIC GND

6

5

R46

220K

2

3

NC

OP4N25

4

R47

10K

TX

RX

GND

GND

BLOCK

PIC TX

CN15

7

8

9

10

11

12

13

3

4

1

2

5

6

LOGIC GND

IR IN

PGM

MCLR HUB

PROGRAM_DATA

PROGRAM_CLK

HUB DATA OUT

HUB CLOCK OUT

FFC 13WAY

RS232 & IR CABLE FROM FRONT PANEL PCB

RS232 CONN

1

2

3

4

CN16

TX

RX

GND

CHAS

CONN-2.5PH-SIL4

FEMALE

R48

10K

LOGIC GND

C30

100nF CERAMIC

LOGIC GND

Q4

BC337

+5V

R51

10K

Q6

BC337

R54

10K

R53

100K

R52

10K

Q5

BC337

12

13

U7:D

8

4011

VDD=+5V

U7:C

9

4011

VDD=+5V

5

6

4

4011

VDD=+5V

VSS=LOGIC GND

U7:B

11

R50

100R

10

CHASSIS GND

C39

1N 50V NP0

C11

100nF

LOGIC GND

IR OUT

CN10:B

AV2-8,4-14/EC

3

4

R49

2R2

ABUS GND

D2

A

K

R11

22K

LEFT

ABUS GND

R20

470R

+12V

R10

10K

R9

4K7

Q2

BC337

ABUS GND

STATUS LINE DRIVER

R21

10K

Q1

BC327

D5

1N4148

D6

1N4148

R7

100R

R8

100R

R42

10K

D7

BZX79C2V7

D8

BZX79C2V7

LOOKING AT LEADS

IN OUT

78L12

R43

10K

C37

220U 25V EL

ABUS GND

ABUS GND

R55

10K

R28

10K

C19

220U 25V EL

C27

47U 25V

C20

47U 25V

ABUS GND

R26

4K7

R14

4K7

+12V

Q3

BC337

R39

4K7

C26

47U 25V

C21

47U 25V

C25

47U 25V

C22

47U 25V

C28

47uF 25V

C24

47U 25V

R27

4K7

R4

4K7

R40

4K7

R32

4K7

R41

4K7

R33

4K7

+12V

R6

12K

R29

12K

R30

12K

R31

12K

2

CN2

C8

3

U2

7812

VO

C7

100nF

10uF 25V

+24V

VI

1

+24V IN

R13

C9

10R 2W

220U 35V EL

5

6

3

2

5

6

3

2

+24V

C1

100nF

U1:A

1

NE5532

ABUS GND

ABUS GND

R1

47R

RIGHT

ABUS GND

R5

12K

C3

10pF

ABUS GND

U1:B

7

NE5532

R2

47R

LEFT

C4

10uF 25V

C33

47pF

C5

10uF 25V

C34

47pF

R3

12K

C2

10pF

+24V

C12

ABUS GND

100nF

U3:A

1

NE5532

ABUS GND

R15

47R

RIGHT

C15

10uF 25V

C35

47pF

ABUS GND

C14

10pF

R18

12K

U3:B

ABUS GND

7

R16

47R

LEFT

C16

10uF 25V

C36

47pF

R17

12K

C13

NE5532

10pF

ABUS GND

D3

1N4004

F3

POLYFUSE 1-1A

C32

1

RICCO PCB JACK

+24V IN

A-BUS A

TOP OF CONN

POLYFUSE 1-1A

F1

9

10

11

12

13

14

15

16

CN1:B

GND

L

GND

IR

STATUS

R

0V

+24V

VERT2RJ45

CN1:C

17

18

19

20

21

22

GND

GND2

GND3

GND4

GND5

GND6

VERT2RJ45

CHASSIS GND

POLYFUSE 1-1A

F2

3

2

1

5

4

8

7

6

CN1:A

GND

L

GND

IR

STATUS

R

0V

+24V

VERT2RJ45

A-BUS B

BOTTOM OF CONN

R35

100R

R36

100R

R22

100R

R23

100R

R25

27K

R24

27K

ABUS GND

R38

27K

R37

27K

ABUS GND

CN4

IR EMITTER OUTPUTS

CN6

IR EMITTER OUTPUTS

3

4

1

2


AP163771/3 Hub PCB Schematic

39


RS232

AP16378/3

AP16378/3


AP16377/3 Hub PCB Layout (Top Panel)

40



AP16377/3 Hub PCB Layout (Bottom Panel)

41

Cambridge Audio Azur 840A Amplifier Hub Board BOM


RESISTORS

4 7 R

4 K 7

0 .


0 .


P Y 2 5 9

P Y 1 1 4 4

P Y 1 0 0 7

P Y 7 5 5

P Y 2 1 9

P Y 2 1 4

PY962

1 0 K

1 2 K

2 2 K

2 7 K

1 0 0 K

3 9 0 K

2 R 2

4 7 R

1 0 0 R

2 2 0 R

4 7 0 R

4 K 7

1 0 K

4 7 K

1 0 R

CAPACITORS

1 0 p F

4 7 p F

1 0 0 n F

10uF

10uF

47uF

220uF

220uF

SEMICONDUCTORS

N E 5 5 3 2

CD4011BE

7 8 1 2

O P 4 N 2 5

PIC16F627 -04/P

T S O P 3 4 8 3 7

T S O P 3 4 8 3 6

TRANSISTORS

B C 3 2 7 2 5

B C 3 3 7 2 5

DIODES

1N4004

MV50640

1N4148

BZX79C2V7

MISCELLANEOUS

AJ-600-21-F-4-B

RDC-020-05

C K X 3 .

5 1 0

JY-5033P*030

CKX-3.5-12

0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .


0 .



C e r a m i c

C e r a m i c

5 0 V 1 0 % P i t c h = 3 m m

5 0 V 1 0 % P i t c h = 3 m m



Pitch =2.5mm


Pitch =2.5mm


Pitch =2.5mm


Pitch =2.5mm


Pitch =3.5mm

Q t y

5

1

L o w n o i s e d u a l O p A m p

Texas Instruments Quad NAND gate

IC

1 2 V , 1 A r e g u l a t o r , T O 2 2 0

O p t o i s o l a t o r

2

1

1

1

PIC Microcontroller

3 7 K h z I R R e c e i v e r M o d u l e

3 6 K h z I R R e c e i v e r M o d u l e

P N P S m a l l S i g n a l


General Purpose Rectifier diode

R e d L E D

Small Signal Diode

Zener Diode 2.7 Volts

Allsun Dual vertical RJ45

DC power in connector

D u a l 3 .

5 m m j a c k s o c k e t ( g r e e n )

Female XLR socket with gold pins

Single 3.5mm jack socket (black)

8

2


4

9

1 0

8

1

4

2

1

1

2

8

3

2

1

2

1

1

R 1 , R 2 , R 1 5 , R 1 6

R4, R9, R14, R26, R27, R32, R33,

R40, R41

R10, R28, R42, R43, R47, R48, R51,

R52, R54, R55

R 3 , R 5 , R 6 , R 1 7 , R 1 8 , R 2 9 R 3 1

R 1 1

R 2 4 , R 2 5 , R 3 7 , R 3 8

R 5 3 , R 5 6

R 5 7

R 4 9

R 1 9 , R 3 4

R7, R8, R12, R22, R23, R35, R36,

R50

R 4 4 , R 4 5

R 2 0

R 3 9

R 2 1 , R 5 1 ,

R 5 9

R 1 3

, R 6 0

R 5 8


4

4

1 0

3

C 2 , C 3 , C 1 3 , C 1 4

C 3 3 C 3 6

C1, C6, C7, C11, C12, C17, C23,

C29, C30, C32

C10, C18, C31

1

1

5

1

1

C4, C5, C8, C15, C16

C20-C22, C24-C28

C19, C37

C9

U 1 , U 3

U 7

U 2

U 8

U5

U 4

U 6

Q 1

Q 2 Q 6

1

2

D3

D 1 , D 2

2

2 D5, D6

D7, D8

1

1

2

2

1

CN1

CN2

C N 4 , C N 6

CN7, CN8

CN9

T O 9 2

T O 9 2

N o t e s

NO ALTERNATIVE LED TO BE USED

Fitted as part of assembly with AP17339/3

I R E M I T T E R O U T P U T S

AP16380/5

D I L 0 8

A l t e r n a t i v e i s N a t i o n a l s e m i C D 4 0 1 1 B C N

T O 2 2 0

D I L 0 6

DIL18

Contact Audio Partnership Service

Department

T S O P 1 8 V ( R e p l a c e s T S O P 1 8 3 7 )

T S O P 1 8 V ( R e p l a c e s T S O P 1 8 3 6 )


42

Cambridge Audio Azur 840A Amplifier Hub Board BOM

A P N o V a l u e

PY1143

PY1142

AV2-8,4-14/EC

D100-SSV-10

D100-SSV-13

C O N N 2 .

5 P H S I L 4

C O N N 2 .

5 P H S I L 6

AP17339/3

P O L Y F U S E 1 1 A

D e s c r i p t i o n / T y p e

Dual phono socket with EMC gnd

Orange inserts

Vertical FFC conn, reverse-needle type single-row contacts 10-way

Vertical FFC conn, reverse-needle type single-row contacts 13-way

J S T v e r t i c a l h e a d e r t y p e X H

J S T v e r t i c a l h e a d e r t y p e X H

IR Receiver Housing

R L D 3 0 P 1 1 0 U

Q t y

1 CN10


1 CN3

1 CN15

1

1

2

3

C N 1 6

C N 5

Fit over D2/U4 and D1/U6

F 1 , F 2 , F 3

N o t e s

AP16380/5

F o r R S 2 3 2 c o n n c a b l e f o r m

F o r b a l a n c e d i n p u t

POLYFUSE 1.1A 30Vdc 7.4*14.2*3MM

6.6Sec


43


230 V

1

MAIN TRANSFORMER

BROWN

Primary

0 V 2

BLUE

115 DEG C

RED

5.5A

1

J1

36 V

TERMINAL

RED

F1

T6A3 AL

LVD!

ORANGE

2 0V

J2

ORANGE

TERMINAL

Secondary

YELLOW

5.5A

3 36 V

J3

TERMINAL

YELLOW

4 38 V

F2

T6A3 AL

LVD!

GREEN

100 mA

RED

5.5A

1 36 V

C3

10nF

C2

10nF

ORANGE

2

Secondary

YELLOW

5.5A

3

0V

36 V

TO POWER AMP SUPPLY RIGHT

GREEN

100 mA

4 38 V

4

C1

10nF

BR1

2

BRIDGE BR-254

J4

+48V OUT

TERMINAL

VIOLET

J6

TERMINAL

GREEN

J5

-48V OUT

TERMINAL

BLUE


AP17575/2 Rectifier PCB Schematic

44


AUDIO PARTNERSHIP 2005


AP17575/2 Rectifier Board PCB Board Layout (Top Side)

45



AP17575/2 Rectifier Board PCB Board Layout (Bottom Side)

46

Cambridge Audio Azur 840A Amplifier, Rectifier PCB BOM

AP No Description/Type Value

CAPACITORS

10nF X1 Capacitor

DIODES

MEX103K300A02 Pitch =10mm

Qty

3

Bridge Rectifier BR254 400PIV 25A blk metal case

MISCELLANEOUS

T6A3 AL

4 0 3 1 0 5 0 1 0 0 0 0 1

6.3 Amp 20mm anti surge Fuse, low breaking capacity

F u s e h o l d e r 2 0 m m

1

2

2

Component Ident

C14-C16

BR1

F1, F2

F 1 , F 2

Notes

AP17578/2

Rectifier is not soldered to PCB until

PCB is fixed to amplifier heatsink



47

Cambridge Audio Azur 840A Amplifier IC Pin Layout

Details

TC9163AF – Input PCB (U1)

NE5532

Input PCB - (U2, U3, U4, U5, U6, U7, U8, U9,

U14 & U18)

A-BUS PCB – (U1 & U3)

Pre-Amp PCB – (U1, U2, U9 & U12)

ULN2003A

Input PCB - (U16)

Pre-Amp PCB – (U4, U5 & U7)

BC337

Input PCB - (Q1)

Pre-Amp PCB – (Q2, Q3, Q4 & Q5)

Front Panel PCB – (Q2, Q3, Q4 & Q5)

Right Hand Power Amp PCB – (Q11, Q31, Q32,

Q33, Q34, Q35 & Q36)

A-BUS PCB – (Q2, Q3, Q4, Q5 & Q6)

Left Hand Power Amp – (Q11)

TSOP18

Pre-Amp PCB - (U10)

PIC16F877A-I/SP

Front Panel PCB

48

74HC4094

Front Panel PCB - (U2, U3, U4, U5 & U6)

BC327

Front Panel PCB - (Q1 & Q8)

A-BUS PCB – (Q1)

LM393AP

Right Hand Power Amp PCB - (U1)

Left Hand Power Amp PCB – (U1)

MJE340

Right Hand Power Amp PCB - (Q1, Q12 &

Q18)

Left Hand Power Amp PCB – (Q1, Q12, Q18 &

Q30)

MJE350

Right Hand Power Amp PCB - (Q2)

Left Hand Power Amp PCB – (Q2)

MPSA93

Right Hand Power Amp PCB - (Q3, Q4, Q5 Q6,

Q20, Q22, Q24, Q27, Q28 & Q29)

Left Hand Power Amp PCB – (Q3, Q4, Q5, Q6,

Q20, Q22, Q24, Q27, Q28, Q29, Q31)

MPSA43

Right Hand Power Amp PCB - (Q7, Q8, Q9,

Q10, Q19, Q21, Q23, Q25 & Q26)

Left Hand Power Amp PCB – (Q7, Q8, Q9,

Q10, Q19, Q21, Q23, Q25, Q26)

49

7812

A-BUS PCB - (U2)

OP4N25

A-BUS PCB - (U8)

PIC16F627-04/P

A-BUS PCB - (U5)

TSOP34837

A-BUS PCB - (U4)

TSOP34836

A-BUS PCB - (U6)

2SA1295

Right Hand Power Amp PCB - (Q13, Q14 &

Q17)

Left Hand Power Amp PCB – (Q13, Q14 &

Q17)

2SC3264

Right Hand Power Amp PCB - (Q15 & Q16)

Left Hand Power Amp PCB – (Q15 & Q16)

CD4011BE

A-BUS PCB - (U7)

50

AP16396/2 Azur 840A Amplifier Technical Description

Start:

Updated:

11 Aug 05 Version 2

29 Nov 05

Revision history

V1->V2 More info added to operating instructions summary

This document gives a concise guide to the operation of the 840A XD amplifier.

CONTENTS

Azur 840A power supply PCB

Azur 840A front panel PCB

AP16373/3_B

AP16369/3

Azur840A input board PCB

Azur 840A preamp PCB

AP16361/3

AP16365/3

Azur 840A power amp Left PCB AP16693/4

Azur 840A power amp Right PCB AP16373/3_A

Azur 840A A-BUS Hub PCB AP16377/3

AP17575/2 Azur 840A Rectifier PCB

Operating instructions summary

Service Menu

---==========================================---

NOTES

Logic signals are in upper case, thus; MAINS FAIL

References to “the PIC” or “the main PIC” are to the main housekeeping PIC on the front panel PCB unless otherwise stated.

51

The Power Supply PCB

This carries:

Power supplies for everything except power amps

Mains on/off and inrush control switching relays

X2 capacitor

The mains-fail detect circuit

There are four power supply rails:

+15V Opamp supply

-15V Opamp supply

+9V Relay supply

+5V Microcontroller, logic and comparator supply

The power supply board also carries the mains switching relays that control the supplies to the power amplifiers. When the amplifier goes from standby to ON, the inrush control relay RL4 closes first with

R78 limiting the inrush current. After 3 seconds (while speaker-short testing is going on- see below) the

On/Off relay RL3 closes. 100 msec later (to ensure no break in the supply) RL4 opens. When the amplifier goes from ON to standby, RL3 simply opens.

The front panel PCB

This carries:

The main PIC

The volume rotary encoder and control switches.

The LCD display

Shift registers for driving the relays

The RS232 interface for control and software updates

U1 is the main housekeeping microcontroller for the amplifier; it is a 16F977A PIC running at 20 MHz. It handles all the control functions of the amplifier except for those on the A-BUS hub PCB, which are dealt with by another PIC on that board.

PIC pins handling amplifier conditions:

Speaker short-circuit detect

Pin Normal

7 LOW

Phones detect 27

Mains fail 28

HIGH

Active

HIGH Active= short found

LOW Active= Phone jack in

LOW HIGH

DC offset protection 29

Overtemperature protection 30

Overload protection 33

Clip detection 34

HIGH

HIGH

HIGH

LOW

LOW

LOW

HIGH LOW

The LCD display module interfaces to the front panel PCB through CN2. Display data from the PIC is clocked serially into shift register U2 and sent to the LCD module in byte-wide parallel format. The

LCD module is powered from the +5V rail.

52

The relays on the other PCBs are controlled by a set of shift registers that convert serial data from the

PIC into 32 latched outputs. Four shift registers (U3,U4,U5,U6) are connected so that the serial input enters the first register and is clocked through and out of its serial output into the serial input of the second register. Changing any output requires 32 bits to be clocked through the registers by the SERIAL

CLOCK signal. When SERIAL STROBE goes high the data is latched in each register to give a static output. Data appears at the outputs only when the SHIFT REG ENABLE line is high. This line is kept low at start-up to prevent random data at the outputs, and only goes high when the PIC has initialised the shift registers.

The RS232 interface is used to control the amplifier and can also be used to reprogram the main PIC.

The interface consists of Q3 and Q4. Q3 handles incoming RS232 data, providing a level-shift from

RS232 levels (nominally +/-9V) to PIC levels (+5V/0V). Q4 handles outgoing RS232 data, level shifting it to give a +15V/0V output.

The main PIC is reprogrammed by holding the standby/ON button in when the mains power is turned on. The word DOWNLOAD appears on the LCD. A PC running a Windows program is used to download the program.

The Hub PIC can in turn be reprogrammed by the main PIC. This is done by the PGM, MCLR HUB,

PROGRAM_DATA, and PROGRAM_CLOCK lines that go to the Hub PCB via CN3.

The Input PCB

The input PCB carries:

Input buffers

Input select relays

Tape out buffer

Input amplifier +6 dB

Hub input switcher

Relay drivers

The input PCB has one stereo input (Input 1) that accepts both balanced and unbalanced signals, and six more unbalanced stereo inputs. There is a further input for tape monitor use. There is a tape output, taken from before the tone and volume controls, and a preamp output taken from after the tone and volume controls.

All component numbers here refer to the Left channel.

The A-BUS hub also uses the amplifier inputs. The required input is selected separately from the main amplifier input by the CMOS switching IC U1. This is controlled by serial data from the microcontroller on the hub PCB, in response to switch presses or IR commands.

The relays are driven from an 8-bit serial-in parallel-out (SIPO) shift register on the front panel PCB.

The eight logic signals come in on CN8 and control the 7-way open-collector relay driver U16. The eighth relay is controlled by Q1.

53

The Preamplifier PCB

The preamplifier PCB carries:

The tone controls and DIRECT switch

Relay balance control

Balance control buffer Amplifier

Relay volume control

Volume control post amplifier

Relay drivers

ON/standby LED control

The IR receiver

Headphone socket

All component numbers here refer to the Left channel.

The balance control operates in discrete steps selected by relays. There are eight steps on each side of the central position. This is implemented by switching in combinations of three attenuator sections; the first is R97,R22,R105, the second R85,R87 and the third R88,R86,R89. These are switched in or out by relays RL17, RL18 and RL19. When none of these relays are energised the balance network gives the first step of attenuation due to R97.

When RL15 is energised the balance attenuator network is inserted into the left channel and the stereo image is shifted to the right. When RL16 is energised the balance attenuator network is inserted into the right channel and the stereo image is shifted to the left.

The balance control attenuation steps are:

4

5

2

3

Step Nominal dB

0

1

0

-1.3

-2.5

-3.4

-4.5

-5.5

6

7

8

-6.8

-7.7

-8.8

The volume control is a relay-driven stepped attenuator that gives 1 dB steps from 0 dB to -64 dB.

There are 2 dB steps from -64 dB to -76 dB, and two final steps of -84 dB and -infinity. The final step also opens the power amplifier output relays to ensure that “off” is well and truly off,

The volume control has an array of 14 resistances connected to an output rail. Each resistance is connected to either the input signal rail or ground by its associated relay. (RL1 to RL14) The resistances are typically made up two resistors to obtain the exact desired value. This represents a potential divider that allows very fine control of attenuation. The 1 db steps are accurate to within +/-0.2 dB.

The volume network has a constant output impedance of 312 Ohms, independent of volume setting.

The volume setting is stored in non-volatile memory when the unit is switched off at the mains. The volume control can be set to ramp up from zero to the stored setting at power-up, and to ramp down on going to standby; this is an option on the configuration menu.

54

The volume control and balance relays are driven from three 8-bit serial-in parallel-out (SIPO) shift registers on the front panel PCB. The logic signals come in on CN6, CN8 and CN9, and control the 7way open-collector relay drivers U4,U5,U7. Driver U7 also controls the mains on/off and inrush relays,

(on the PSU PCB) the two amplifier output relays, (on the right amplifier PCB).

R111 is a pull-up resistor which allows MAINS ON/OFF RELAY to go high during testing if the PSU board is not being used to power front-panel and preamp PCBs, and thus permits the LED control to work properly in this condition.

Headphone socket

The phones Left and Right signals come in from the two amplifier PCBs. When a jack is inserted in to the phones socket, the normally-closed contacts open, and the PHONES DETECT signal goes low, signalling the PIC to open the output relays and disconnect the loudspeakers.

Power Amplifier PCBs

The power amplifier boards are very similar. The left channel is described in detail, and the right channel description deals only with the differences.

Power Amplifier Left PCB

This description is subdivided as follows:

Input stage

DC trim system.

The Voltage Amplifier Stage

Biasing system

Output stage

The XD Crossover Displacement system

Power supplies

Overload protection

Clip detection

DC offset protection

Over-temperature protection

Speaker short-circuit detection

Headphone output attenuator

DC trim system.

VR2 and its associated components make up the DC trimming network; this allows to output DC offset to be reduced to less than 1mV.

The XD Crossover Displacement system.

The essence of the Crossover Displacement principle is the injection of an extra current, varying with the signal, into the output point of a conventional Class-B output stage, with the result that the crossover point is displaced away from the no-signal voltage. The displacement current is made proportional to the output voltage. For example, if the displacement current is 1 Amp with the output at quiescent at 0V, it is set to increase to 2 Amps with the output fully negative, and to reduce to zero with the output fully positive.

55

The XD control circuit is a differential pair of transistors with one input grounded and the other driven by the main amplifier output voltage, scaled down appropriately by R63, R64. The drive to the displacer is taken from collector load R58, to give the required phase inversion. R59 is present simply to equalise the dissipation in the differential pair transistors to maintain their balance.

The tail of the differential pair is fed by constant-current source Q27. Since half of the standing current through the differential pair flows through R58, the value of the tail current-source sets the quiescent displacement current. Q27 is a simple current-source biased by silicon diodes D12, D13.

The displacement current itself is handled by the voltage-controlled current source Q18, Q17. The

Q18, Q17 structure acts as a unity-gain voltage stage with 100% voltage feedback from Q17 collector to Q18 emitter, and it sets up the voltage across R58 as a voltage across the low-value resistor R31, minus the Vbe drop of Q18.

There is provision for turning off the XD system under PIC control, to make servicing easier. This is done by Q26. Normally the XD ON/OFF signal coming in on Pin 9 of CN2 is high, (+5V) so Q31 is held off and Q26 is off. When XD is disabled, XD ON/OFF goes low and Q31 is turned on via R83. Q26 is then turned on via R82. The equivalent to Q26 on theright power amp PCB is also turned on by the connection through Pin 10 of CN1.

Power supplies

The power supply for the power amplifier consists of three rails. The voltages given here are nominal as they depend on the exact value of the mains supply voltage

The +48V rail supplies all the positive power to the amplifier.

The -48V rail powers only the amplifier output stage, including the XD Crossover Displacement system.

The -51V rail provides negative power for the small-signal circuitry. This permits greater output as without it the negative-going voltage-swing of the voltage-amplifier stage is limited, and negative clipping occurs before positive clipping.

Overload protection.

The amplifier is protected against short-term overloads by dual slope VI limiting. The upper half of the output stage is protected by Q19 and associated components.

When overload occurs Q19 conducts and shunts current away from the base of Q1, limiting the amplifier output. The current so shunted is limited in magnitude by the current-source Q4.

D2 prevents Q19 conducting backwards on negative output excursions.

The protection of the lower half of the output stage is very similar, Q20 being the VI limiter. However, in this case the current shunted away when Q20 conducts is not inherently limited; this is done by the extra current-limiting circuit Q11, R15, R16. When the voltage across R9 becomes excessive, Q11 turns on and shunts the base drive away from Q9.

The amplifier is protected against long-term overloads by the PIC opening the output relay. Operation of the VI limiter Q20 draws extra current through R9 and turns on Q25 via R49; this happens at a lower current than that at which Q11 limits the VAS current.

Q25 collector is wire-ORed with the equivalent transistor on the right-hand amplifier PCB, and the

OVERLOAD SIGNAL goes to the preamp PCB via CN2, pin6.

56

Clip detection.

When it is enabled, the clip-detect system turns down the volume when excess clipping of either amplifier output occurs. Very brief episodes of clipping are ignored. The volume stays reduced and does not ramp back up in the absence of clipping.

The clip detect system is based on Q23, Q24 and associated components. Normally both transistors are on, and the CLIP signal at Q24 collector is high.

Since the circuit operates by monitoring how far the output is from the supply rails, variations in supply voltage are compensated for.

DC offset protection:

The output of the Left amplifier is filtered by R35 and C3 to remove audio content. If a DC voltage of either polarity exists Q21,Q22 turn on and the voltage on Q21 collector falls. This point is wire-ORed with the DC offset detector voltage on the right power amplifier PCB via CN1.

Detailed operation is as follows:

+ve DC offset: D4, Q21, Q22, D6 conduct. Other diodes reverse-biased.

-ve DC offset: D3, Q21, Q22, D5 conduct. Other diodes reverse-biased.

Overtemperature protection

Positive thermistor TH1 is mounted on the main amplifier heat-sink. At approx 100degC, its resistance has risen to the point that the voltage on pin 6 of comparator U1:B exceeds the reference voltage of

+850 mV set up by R69,R70, and the comparator output goes low to 0V. R71 provides a small amount of hysteresis to give clean switching. The comparator has an open-collector output and R75 is the external pull-up resistor. The output signal is passed to the main PIC.

Speaker short-circuit detection

When the amplifier goes from standby to ON, the speaker outputs are checked for short-circuits before the output relays are closed. This system is centred on comparator U1:A but also involves circuitry on the Right Amplifier PCB.

Short-circuits are checked for by passing a small current through the loudspeaker impedances and monitoring the resulting voltage. A DC current of 5mA is injected through R101 on the Right Amplifier

PCB, via the normally-closed contacts of RL1 and RL2. This places all connected loudspeakers, left and right, A and B, in parallel so the resulting voltage is not large. It is sent to the left amplifier PCB, where comparator U1:A compares it with a reference voltage of 5mV set up by potential divider R85,R87. If the combined loudspeaker resistance is below 1 Ohm, the output of U1:A goes high, signalling a short condition to the main PIC.

Headphone output attenuator

The headphone output attenuator comprises R40 and R41. The headphone socket is on the preamp

PCB.

Power Amplifier Right PCB

This description is subdivided as follows:

The right power amplifier

The output relays

Output relay control system

Mains-fail detect system

57

The right power amplifier and its various protection systems operate identically to those on the left amplifier PCB, except for the following differences:

Mains-fail detect system

The mains-fail detect system is based on comparator U1:B. It takes the MAINS FAIL IN signal from the

PSU board (see above) and compares it with a reference voltage of +310 mV set up by potential divider

R81,R80. When MAINS FAIL IN drops below this threshold, the output goes high. This signal, MAINS

FAIL, is sent to the PIC via CN1, pin 9.

A-BUS Hub Board

This board carries the following functions:

The XLR sockets for the balanced input mode of Input 1

Two A-bus outputs

Hub IR input

Hub microcontroller

Hub Power supply

IR in/out interface

The XLR sockets simply pass the Input 1 signals down to the input board via screened cables.

The A-bus outputs take an input selected by the hub input switcher, amplify it by 2.5 times, and send it to the remote keypads. R59,R60 are DC drain resistors that minimise clicks shortly after power-up.

The output amplifiers U1,U2 work from a single +24V rail, and so are biased to sit at +12V. The bias supply is derived from the +12V supply rail.

The hub amplifiers have their own ground (ABUS GND) to prevent ground loops, and this use of the differential amplifier performs a change of reference so a clean signal reaches the hub amplifier seven if the two grounds have noise voltage between them.

The hub microcontroller U5 is a PIC16F72. This performs the following tasks:

Control Hub input switcher from IR commands

Send input select data to main PIC

Control Hub input switcher to prevent thumps on 840A output

Control A-bus status line

IR commands to the A-bus keypads are sent to the hub so that the required input can be selected and external equipment controlled. Thus, for example, a tuner station can be changed from the keypad; the

IR comes to the hub, is sent out again via the IR emitter outputs, and activates emitters pointing at the tuner unit.

Modulated IR signals coming in from the keypads are diode-ORed together by D5, D6. The Zener diodes D7, D8 reject low-level noise on the incoming IR lines. The combined IR signals are buffered by emitter-follower Q3, and sent out via CN4, CN6 to drive external IR emitters. Incoming modulated IR signals for input select are also sent to the Hub PIC U5; LED D2 is driven from Q3, and points at IR receiver U4, the pair being housed in a small light-tight enclosure. The demodulated IR is then applied to Pin 7 of Hub PIC U5, which sends appropriate commands to the hub input selector IC on the input

PCB, over the strobe, clock and data lines.

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Information on which Hub input is selected (or if no input is selected) is sent from the Hub PIC to the main PIC by the two lines HUB CLOCK OUT and HUB DATA OUT. This is then displayed on the

LCD. The active 840A input is denoted by a round marker; the active Hub input is denoted by a circle around it.

The Hub PIC controls the A-bus status line so that it is high when the 840A is powered and low when it is not. It also implements the “all off” feature; when this command is received from one keypad the Hub

PIC ensures that both are turned off.

The Hub PIC can be reprogrammed by the main PIC. This is done by the PGM, MCLR HUB,

PROGRAM_DATA, and PROGRAM_CLOCK lines that come from the front panel PCB via CN15.

IR in/out interface

The other IR system on the Hub PCB is wholly concerned with control of the 840A amplifier itself, and has no connection with the Hub IR system.

Modulated IR data (as an electrical signal) enters via 3.5mm jack CN9, and drives LED D1, which illuminates IR receiver U6, the pair being housed in a small light-tight enclosure. This demodulates the IR and passes it on to U7:A, which ORs it with the data from the unmodulated IR input, and sends the IR

IN signal to the main PIC via CN15. When it reaches the front panel PCB (see above) it is further ORed with the IR data from the receiver on the front of the 840A unit.

The unmodulated IR signals enter via phono connector CN10:A, and drive optocoupler U8; this isolates the grounds and prevents ground loops. The optocoupler output drives Q4 through R47. Q4 collector, if Q6 is off, provides the IR signal to U7:A as mentioned above, and also drives Q5 via R53, to re-invert the signal and preserve its phase. It is then OR-ed with the PIC TX signal by U7:B, and buffered by

U7:C and U7:D to provide enough drive for the IR output. R50 protects the output and C11,R49 isolate the IR output ground.

IR commands can also be generated by the 840A itself. These come from the main PIC as the signal PIC

TX on CN15, and are combined into the IR output as described above. When such commands are being sent, it is important to disable any external IR commands from being sent through as they will combine to give garbled data. This is done by the BLOCK signal from the main PIC, coming in via CN15. When this is high it turns on Q6 and prevents external IR commands from reaching Q5.

The Rectifier PCB

This board mounts on the main heat-sink of each amplifier module. It consists of the rectifier itself, three suppression capacitors to reduce RF noise created by rectifier commutation, and two fuses in the incoming AC lines from the transformer.

---================ ================== ============---

Operating Instructions Summary

This is a very brief guide to enable all the controls and menus of the 840A to be accessed if the full manual is not available. (see www.cambridge-audio.com

for a downloadable user manual).

To adjust the balance:

Briefly press the Mode button. The balance display appears and can be changed using the volume knob.

To return to volume mode, give the Mode button another quick press. The 840A will automatically return to volume mode after 5 seconds.

59

To rename inputs:

Press and hold the relevant input select button. Letters in the name are selected by turning the volume knob.

To access the configuration menu:

Press and hold the Mode button. These are the menu options:

Clip detector on/off

LCD brightness (off/dim/bright)

Input gain trim menu access

Volume ramp on/off

Volume display: -84 to 0 dB or 0 to 72 units

Fixed input gain menu access

To adjust the gain of an input:

Press the button next to INP TRIM

Select the input required

Use volume knob to set gain between 0 and -12 dB

(the available range is restricted if the volume is set very low)

Press Mode button to return to volume display

To set up fixed input gain

Press the button next to FIXED INP

Set the fixed gain using the volume control.

(the OFF setting does not disable the input- it leaves the input gain

subject to the volume control)


To access the service menu:

Hold in the Mode button when mains power is switched on. These are the menu options:

Speaker short detection on/off

DC offset detect on/off

XD system on/off

Counter access


The counter page keeps a total of the number of times these events have occurred:

Clipping detected CL

DC offset detected DC

Overload protection OV

Overtemperature shutdown TM

Speaker short detected

Time on in hours

SH

ON

Press Mode button to return to service menu

To reprogram the PICs:

Hold in the ON/standby button when mains power is switched on. The word DOWNLOAD appears on the LCD.

60

840A Software Loading Instructions

1) Push and hold the “Standby / On” on the front of the 840A whilst turning on the power switch at the rear. After about 4 seconds the following should be displayed on the LCD:

2) Connect a Null Modem RS232 cable from the 840A to the PC’s comm port.

3) Run the Loader program from the Azur 840A program group in the start menu. The following window will be displayed:

4) Choose the comm port the RS232 cable is attached to and click OK. The following window will be displayed:

61

5) Click the Load File button, the following window will be displayed:

Locate the file “840A.hex” and click open. The following window should be displayed:

6) Click the Download Code button, “Loading…” will be displayed on the LCD. The ABUS processor will be programmed followed bythe Main processor. Once the programming has finished, “Programming Completed!” will be displayed and the 840A will reset.

62

840A

________________________________________________________________________________

Notes.

Gallery Court Hankey Place London SE1 4BB UK

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

63

Cambridge Audio Azur 840A Service manual

SERVICE MANUAL

840A SERVICE MANUAL

SAFETY PRECAUTIONS & IMPORTANT NOTES

COPYRIGHT NOTICE.

Cambridge Audio Azur 840A Amplifier

840A Block Diagram

Cambridge Audio Azur 840A Amplifier

840A Exploded Diagram

Cambridge Audio Azur 840A Amplifier

AP16369/3 Front Panel PCB Schematic (Microcontroller & LCD)

Cambridge Audio Azur 840A Amplifier

AP16369/3 Front Panel PCB Schematic (Shift Registers)

Cambridge Audio Azur 840A Amplifier

AP16369/3 Front Panel PCB Layout (Top Side)

Cambridge Audio Azur 840A Amplifier

AP16369/3 Front Panel PCB Layout (Bottom Side)

Cambridge Audio Azur 840A Amplifier

AP16361/3 Input PCB Schematic (Input Select)

Cambridge Audio Azur 840A Amplifier

AP16361/3 Input PCB Schematic (Input Control)

Cambridge Audio Azur 840A Amplifier

AP16361/3 Input PCB Schematic (Input Amplifier)

Cambridge Audio Azur 840A Amplifier

AP16361/3 Input Board PCB Board Layout (Top Side)

Cambridge Audio Azur 840A Amplifier

AP16361/3 Input Board PCB Board Layout (Bottom Side)

Cambridge Audio Azur 840A Amplifier

AP16365/4 Preamp PCB Schematic (Relay Logic)

Cambridge Audio Azur 840A Amplifier

AP16365/4 Preamp PCB Schematic (Tone Control)

Cambridge Audio Azur 840A Amplifier

AP16365/4 Preamp PCB Schematic (Post Amp)

Cambridge Audio Azur 840A Amplifier

AP16365/3 Preamp PCB Layout (Top Side)

Cambridge Audio Azur 840A Amplifier

AP16365/3 Pre-amp PCB Layout (Bottom Side)

Cambridge Audio Azur 840A Amplifier

AP16373/4 Power Amplifier (Right) Power Supplies & PSU PCB Schematic

Cambridge Audio Azur 840A Amplifier

AP16373/4 Power Amplifier Right Channel

Cambridge Audio Azur 840A Amplifier

AP16373/3 Power Amp (Right) & PSU PCB Layout (Top Side)

Cambridge Audio Azur 840A Amplifier

AP16373/3 Power Amp Right & PSU PCB Layout (Bottom Side)

Cambridge Audio Azur 840A Amplifier

AP16693/5 Power Amplifier Left Channel

Cambridge Audio Azur 840A Amplifier

AP16693/5 Power Amplifier Left Power Supplies

Cambridge Audio Azur 840A Amplifier

AP16693/5 Power Amp PCB Board Layout (Top Side)

Cambridge Audio Azur 840A Amplifier

AP16693/5 Power Amp PCB Board Layout (Bottom Side)

Cambridge Audio Azur 840A Amplifier

AP163771/3 Hub PCB Schematic

Cambridge Audio Azur 840A Amplifier

AP16377/3 Hub PCB Layout (Top Panel)

Cambridge Audio Azur 840A Amplifier

AP16377/3 Hub PCB Layout (Bottom Panel)

Cambridge Audio Azur 840A Amplifier

AP17575/2 Rectifier PCB Schematic

Cambridge Audio Azur 840A Amplifier

AP17575/2 Rectifier Board PCB Board Layout (Top Side)

Cambridge Audio Azur 840A Amplifier

AP17575/2 Rectifier Board PCB Board Layout (Bottom Side)

Cambridge Audio Azur 840A Amplifier IC Pin Layout

Details

AP16396/2 Azur 840A Amplifier Technical Description

840A Software Loading Instructions

Notes.

Key Features

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