AP195971 Cambridge Azur 840A Service Manual 2...Cambridge Audio Azur 840A Amplifier Exploded Diagram...

Gallery Court Hankey Place London SE1 4BB UK Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233

840AIssue Date: 16th June 2006

________________________________________________________________________________

SERVICE MANUAL

________________________________________________________________________________

SPECIFICATIONS:

Power Output 120W RMS into 8 Ohms

200W RMS into 4 Ohms

THD (unweighted) < 0.0015% 1 kHz

at 80% of rated power

< 0.015% 20Hz – 20kHz

at 80% of rated power

Frequency Response 10Hz – 50kHz +/- 1dB

S/N ratio (ref 1W/8 Ohm) >83dB

Input Impedances Input 1 (balanced) 10 kOhm

Inputs 2-7 68 kOhm

Tape Input 68 kOhm

Power Amp damping factor > 110 at 1kHz

Max power consumption 800W

Minimum power consumption Active (no signal) 70W

Standby 7W

Bass & Treble controls Shelving type

Max bass boost/cut +/- 10dB at 10Hz

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

Dimensions (H x W x D) 115 x 430 x 385mm

(4.5 x 16.9 x 15.2”)

Weight 15.0kg (33Lbs)

AP19597/1

1

840A SERVICE MANUAL

TABLE OF CONTENTS

Safety Precautions & Important Notes 4

Block Diagram 5

Exploded Diagram 6

Exploded Diagram Parts List 7

Front Panel PCB Schematic (Microcontroller & LCD) 8

Front Panel PCB Schematic (Shift Registers) 9

Front Panel PCB Layout (Top Side) 10

Front Panel PCB Layout (Bottom Side) 11

Front Panel PCB BOM 12

Input PCB Schematic (Input Select) 13

Input PCB Schematic (Input Control) 14

Input PCB Schematic (Input Amplifier) 15

Input PCB Board Layout (Top Side) 16

Input PCB Board Layout (Bottom Side) 17

Input PCB BOM 18

Preamp PCB Schematic (Relay Logic) 19

Preamp PCB Schematic (Tone Control) 20

Preamp PCB Schematic (Post Amp) 21

Preamp PCB Board Layout (Top Side) 22

Preamp PCB Board Layout (Bottom Side) 23

Preamp PCB BOM 24-25

Power Amplifier Schematic (Right Power Supplies & PSU) 26

Power Amplifier Schematic (Right Channel) 27

Power Amp Right & PSU PCB Board Layout (Top Side) 28

Power Amp Right & PSU PCB Board Layout (Bottom Side) 29

Power Amp Right PCB BOM 30-31

Power Amp PSU PCB BOM 32

Power Amp Schematic (Left Channel) 33

Power Amp Schematic (Left Power Supplies) 34

Power Amp PCB Board Layout (Top Side) 35

Power Amp PCB Board Layout (Bottom Side) 36

Power Amp Left PCB BOM 37-38

Hub PCB Schematic 39

2

Hub PCB Board Layout (Top Side) 40

Hub PCB Board Layout (Bottom Side) 41

Hub PCB BOM 42-43

Rectifier PCB Schematic 44

Rectifier PCB Board Layout (Top Side) 45

Rectifier PCB Board Layout (Bottom Side) 46

Rectifier PCB BOM 47

IC Pin Layout Details 48-49

Technical Description 51-60

Procedure to upgrade the Control (Pic) Software 61-62

Notes 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.

© 2007 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

840A Block DiagramTo enhance viewing, please print to A3 5

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

MCLR/VPP1

RA0/AN02

RA1/AN13

RA2/AN24

RA3/AN3/VREF5

RA4/T0CKI6

RA5/AN4/SS7

RE0/RD/AN58

RE1/WR/AN69

RB437

RB3/PGM36

RB235

RB0/INT33

VDD32

VSS31

RD7/PSP730

RD6/PSP629

RB134

RD5/PSP528

RD4/PSP427

RC7/RX/DT26

RC5/SDO24

RC4/SDI/SDA23

RD3/PSP322

RD2/PSP221

RC6/TX/CK25

VDD11

VSS12

OSC1/CLKIN13

OSC2/CLKOUT14

RCO/T1OSO/T1CKI15

RC1/T1OSI/CCP216

RC2/CCP117

RC3/SCK/SCL18

RD0/PSP019

RE2/CS/AN710

RD1/PSP120

RB538

RB6/PGC39

RB7/PGD40

U1

PIC16F877A

SW1

SW-TACT

SW2

SW-TACT

SW3

SW-TACT

SW5

SW-TACT

SW6

SW-TACT

SW7

SW-TACT

SW8

SW-TACT

SW4

SW-TACT

SW9

SW-TACT

SW10

SW-TACT

SW11

SW-TACT

INPUT 1 INPUT 2 INPUT 3 INPUT 4

INPUT 5 INPUT 6 INPUT 7 TAPE MON

MODE spare

+5V

LOGIC GND

LCD DISPLAY CONN

C10100n CER

C11 100n CER

LOGIC GND

SERIAL DATA

SERIAL CLOCK

SERIAL STROBE

SERIAL CONTROL OUT

SERIAL IN FROM A-BUS HUB BOARD

OVERLOAD

HUB DATA

CLIP DETECT

MAINS FAIL

DC OFFSET

PHONES DETECT

PORT B HAS WEAK PULLUPS

RB4-RB7 HAS INTRPT ON CHANGE

R122R

R243R

Q2

BC337

LOGIC GND

R44K7

C1100n

C2100nF

ON/STBY SPEAKER SELECT

LOGIC GND

ROW 3

ROW 2

ROW 1

COL 1 COL 2 COL 3 COL 4

X1

CRYSTAL

FREQ=20MHz

C5

22pF

C6

22pFLOGIC GND

+5V

LOGIC GND

CONNECTOR TO PREAMP PCB

SERIAL IN FROM A-BUS HUB BOARD

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

LOGIC GND

TX

RX

RS232 & IR CABLE TO HUB PCB

IR IN (FROM RECEIVER ON PREAMP BOARD)

C GND3

A SW1

B SW2

FIX25

FIX14

ROT1

NOBLE16ENCODER

POSITION FOR

EXTRA SWITCH

AK

D2BLUE LED

ON/STBY LED

IR IN (FROM JACK & PHONO ON HUB PCB)

+15V

IR GND

IR IN

RS232 GND

R1010R

C9

100N CERAMIC

SERIAL RX 232

C410U 16V

C310U 16V

R5100R

C20100nF

LOGIC GND

C21

100n

LOGIC GND

LOGIC GND

Q4

BC337

+15V

RS232 TX

R13

22K

R122K2

LOGIC GND

SERIAL TX 232

Q3BC337

+5V

D31N4002

RS232 RX

R1110K

R9

22K

LOGIC GND

SERIAL RX 232

RS232 RX

RS232 TX

SERIAL TX 232

PROGRAM_CLOCK

PROGRAM_DATA

PGM

MCLR HUB

R1410K

+5V

+5V

Programming Signals

To ABUS Hub PIC

RS232 TX

RS232 RX

MCLR HUB

PGM

PROGRAM_DATA

PROGRAM_CLOCK

HUB CLOCK

HUB CLOCK

HUB DATA

R3

2K2

OVER TEMP

OVER TEMP

1

2

3

4

5

6

7

8

9

10

12

13

11

CN3

FFC 13WAY

BLOCK

PIC TX

SHIFT REG ENABLE

D2

CLK3

STB1

OE15

Q04

Q15

Q26

Q37

Q414

Q513

Q612

Q711

QS9

QS10

U2

74HC4094

VDD=+5V

VSS=LOGIC GND

SHIFT REG ENABLE

SERIAL DATA

SERIAL CLOCK

BLOCK

PIC TXIR CONTROL

PHONES DETECT

OVERLOAD

DC OFFSET

MAINS FAIL

LCD DECOUPLE

C7100nF

LOGIC GND

+5V

SHIFT REG DECOUPLE

1

2

3

4

5

6

7

8

9

10

11

12

CN1

FFC 12WAY

1 2

15 16

1

2

3

4

5

6

1a

2a

3a

4a

5a

6a

7

8

7a

8a

CN2

CONN-8 DUAL BOT

RS

ELCD DATA SHIFT REGISTER

2

1

16

15

LCD CONN ORIENTATION FROM FRONT

C15

100pF

C16

100pF

C17

100n

C18

100n

C19

100n

CLIP DETECT

PIC INPUT EMC CAPS

LED BACKLIGHT POWER

R61K1

R72K2

R8

1K1

SPEAKER TEST

SPEAKER TEST

C22

100n

+5V

TRISTATE LED CONTROL

0 = BRIGHT

TRISTATE= OFF

1= DIM

R1510K

LOGIC GND

R1647R

C23

100N CERAMIC

LOGIC GND

FRONT PANEL GROUNDING

Q5

BC337

R1710K

R182K2

C24

10U 16V

Q6

BC337

R19

10K

LOGIC GND

FRONT PANEL GND

FRONT PANEL GND

P2

PAD

P3

PAD

Q1

BC327-25

2

CW

3C

CW

1

PR1PRESET 20K 3296W

CW

Q8

BC327-25

R23 10R

R24 10R

D41N4148

D5

1N4148

D6

1N4148

D71N4148

D8

BZX79C2V7 500MW

To enhance viewing, please print to A3 8


AP16369/3 Front Panel PCB Schematic (Shift Registers)

D2

CLK3

STB1

OE15

Q04

Q15

Q26

Q37

Q414

Q513

Q612

Q711

QS9

QS10

U3

74HC4094

VDD=+5V

VSS=LOGIC GND

LOGIC GND

D2

CLK3

STB1

OE15

Q04

Q15

Q26

Q37

Q414

Q513

Q612

Q711

QS9

QS10

U4

74HC4094

VDD=+5V

VSS=LOGIC GND

D2

CLK3

STB1

OE15

Q04

Q15

Q26

Q37

Q414

Q513

Q612

Q711

QS9

QS10

U5

74HC4094

VDD=+5V

VSS=LOGIC GND

FROM SHEET 1SERIAL CLOCK

SERIAL DATA

SERIAL STROBE

SHIFT REG ENABLE

1

2

3

4

5

6

7

8

CN4

FFC 08WAY

1

2

3

4

5

6

7

8

CN5

FFC 08WAY

1

2

3

4

5

6

7

8

CN6

FFC 08WAY

D2

CLK3

STB1

OE15

Q04

Q15

Q26

Q37

Q414

Q513

Q612

Q711

QS9

QS10

U6

74HC4094

VDD=+5V

VSS=LOGIC GND

1

2

3

4

5

6

7

8

CN7

FFC 08WAY

C8100nF

+5V

C12100nF

C13100nF

C14100nF

SHIFT REG DECOUPLE

TO PREAMP BOARD

TO PREAMP BOARD

TO PREAMP BOARD

TO INPUT BOARD



AP16369/3 Front Panel PCB Layout (Top Side)

AP16370/3(c) COPYRIGHT Audio Partnership PLC 2005

U1

ROT1

SW1

SW2

SW3

SW4

SW5

SW6

SW7

SW8

X1

SW9

SW10 SW11

C1

C2

C3

C4

C5

C6

C10

C11

C12

C13

C14

C15

C17

R1

R2

R3

R4

R6

D2

D3

R9

R10

R11

R12

R13

R14

R15

C7

C8

C9

C16

C18

C19

Q1 Q

2

Q3 Q4 R5

C20

AP16370/3

C21

C22

R7

U2

U3U4

U5U6

C24

Q5

R17

R18

R19

Q6

C23

P2

P3

R16

CN2

R23

R24

Q8

R8

D4

D5

D6

D7

D8



AP16369/3 Front Panel PCB Layout (Bottom Side)To enhance viewing, please print to A3 11

AP16372/5

AP No Value Description/Type Qty Component Ident Notes

RESISTORS10R 0.25 W 1% Metal Film 3 R10, R23, R2422R 0.25 W 1% Metal Film 1 R143R 0.25 W 1% Metal Film 1 R247R 0.25 W 1% Metal Film 1 R16100R 0.25 W 1% Metal Film 1 R51K1 0.25 W 1% Metal Film 2 R6, R8,2K2 0.25 W 1% Metal Film 4 R3, R7, R12, R18,4K7 0.25 W 1% Metal Film 1 R410K 0.25 W 1% Metal Film 5 R11, R14, R15, R17, R1922K 0.25 W 1% Metal Film 2 R9, R13CAPACITORS22pF Ceramic 50V 10% Pitch=5mm 2 C5, C6100pF Ceramic 50V 10% Pitch=5mm 2 C15, C16

100nF Ceramic 50V 10% Pitch=5mm 17C1, C2, C7, C8, C9, C10, C11, C12-C14, C17 - C21, C22, C23

10uF16V Electrolytic Radial (Height =5.2mm) Pitch=2.5mm

3 C3, C4, C24 Note: Low profile electrolytic

SEMICONDUCTORS

PIC16F877A - I/P PIC Flash Microcontroller 40 pin DIL 1 U1Contact Audio Partnership ServiceDepartment

PY1100 74HC4094 Shift register 16 pin DIL 5 U2 - U6TRANSISTORS

PY219 BC327-25 PNP Small Signal TO92 2 Q1, Q8

PY214 BC337-25 NPN Small Signal TO92 4 Q2, Q3, Q4, Q5

DIODES

BLUE LED Blue LED 3mm UNI flat top 1 D2

1N4148 General purpose diode 4 D4,D5, D6,D7

.esaC53ODWm0048D1Wm0047V2edoidreneZ7V2-C97XZB

1N4002 General Purpose Rectifier 1 D3

MISCELLANEOUS

PY1141 D100-SSV-1212-WAY FFC reverse-needle type, single-row contacts

1 CN1

PY1142 D100-SSV-1313-WAY FFC reverse-needle type, single-row contacts

1 CN3

PY1140 D100-SSV-088-WAY FFC FRONT-PREAMP CONNS, reverse-needle type single-row contacts

4 CN4, CN5, CN6, CN7

PY1138REB161(9x7)PVB20FHINB 1-2-24E

Noble ROTARY ENCODER 1 ROT1

11WS-1WS11hctiwstcaT000-002020-0042340YP

1X1H4/94CHLATSYRCzHM02MULTITURN PRESET 20K

Side adjust. Foot print 9.5 x 4.5 mm 1 PR1

Cambridge Audio Azur 840A Amplifier Front Panel PCB BOM

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

12


AP16361/3 Input PCB Schematic (Input Select)

5

4

CN1:C

QUAD PHONO

6

CN1:D

QUAD PHONO

2

1

CN1:A

QUAD PHONO

3

CN1:B

QUAD PHONO

5

4

CN2:C

QUAD PHONO

6

CN2:D

QUAD PHONO

2

1

CN2:A

QUAD PHONO

3

CN2:B

QUAD PHONO

5

4

CN4:C

QUAD PHONO

6

CN4:D

QUAD PHONO

2

1

CN3:A

QUAD PHONO

3

CN3:B

QUAD PHONO

-15V+15V

R1220K

R2220K

R3

47R

R4

1K

R5

1K

R6220K

R7220K

R8

1K

R9

100R

R10

1K

R12220K

R13220K

R14

47R

R15

1K

R16

1K

R17

1K

R18

1K

R19

100R

R20220K

R21220K

C1

100n CER

C2

100n CER

R23

100R

C3

100nF 100V

R24220K

R25220K

LEFT RIGHT

TAPE RETURN RTAPE RETURN LEFT

HUB INPUT SWITCHER

INPUT PCB - HUB PCB

SWITCHER DATA

SWITCHER CLOCK

SWITCHER STROBE

TAPE OUT R

INPUT 1

INPUT 2

INPUT 3

INPUT 4

INPUT 5

TAPE OUT L

Vss1

L-S12

L-S23

L-S34

L-COM15

L-S46

L-S57

L-S68

L-COM29

L-S710

L-S811

L-COM312

ST13

GND14

Vdd28

R-S127

R-S226

R-S325

R-COM124

R-S423

R-S522

R-S621

R-COM220

R-S719

R-S818

R-COM317

DATA16

CLK15

U1

TC9163

6

7

8

RL1:C

RELAY

3

4

5

RL1:B

RELAY

HUB IN L

5

4

CN3:C

QUAD PHONO

R26

1K

R27

1K

R28220K

R29220K

INPUT 6

INPUT 7

2

1

CN4:A

QUAD PHONO

6

7

8

RL2:C

RELAY

6

7

8

RL3:C

RELAY

6

7

8

RL4:C

RELAY

6

7

8

RL5:C

RELAY

6

7

8

RL6:C

RELAY

6

7

8

RL7:C

RELAY

6

7

8

RL8:C

RELAY

INPUT R

6

CN3:D

QUAD PHONO

R30220K

R31

1K

3

CN4:B

QUAD PHONO

R32220K

R33

1K

INPUT 1

INPUT 2

INPUT 3

INPUT 4

INPUT 6

INPUT 7

INPUT 5

3

4

5

RL2:B

RELAY

3

4

5

RL3:B

RELAY

3

4

5

RL4:B

RELAY

3

4

5

RL5:B

RELAY

3

4

5

RL6:B

RELAY

3

4

5

RL7:B

RELAY

3

4

5

RL8:B

RELAY

3

CN5:B

QUAD PHONO

INPUT L

5

4

CN5:C

QUAD PHONO

6

CN5:D

QUAD PHONO

PREAMP OUT L

PREAMP OUT R

2

1

CN5:A

QUAD PHONO

3

2

1

84 U14:A

NE5532

5

6

7

U14:BNE5532R57 20K

R5820K

R5910K

R6010K

R6120K

R6220K

R63

10K

R6410K

C4100nF

C522pF

C622pF

C722pF

C8

22pF

HUB IN L HUB IN L

HUB IN R

+5V

LOGIC GND

INPUT ONE LEFT +

INPUT ONE LEFT -

GND

GND

INPUT ONE RIGHT +

INPUT ONE RIGHT -

INPUT 1 L-

INPUT 1 L+

INPUT 1 R-

INPUT 1 R+

GND

INPUT 1 L-

INPUT 1 L+

INPUT 1 R-

INPUT 1 R+

R22

100R

R34

100R

3

2

1

84U2:A

NE5532

R35100K

R36

1K

R37

1K

3

2

1

84

U4:A

NE5532

R38100K

C1347pF

C1447pF

C1547pF

C2247pF

C23

47pF

C2447pF

C2547pF

C2647pF

C2747pF

C2847pF

C2947pF

C3047pF

C3147pF

PREAMP OUT

PREAMP OUT

C3247pF

+15V

-15V-15V

+15V

3

2

1

84 U3:A

NE5532

R42100k

R4347K

5

6

7

U3:B

NE5532

R4447K

R45100K

3

2

1

84 U5:A

NE5532

R40100K

R4147K

5

6

7

U5:B

NE5532

R4647K

R47100K

+15V

-15V

C38

10U NP 35V

C36

10U NP 35V

C39

10U NP 35V

C41

10U NP 35V

C45

10U NP 35V

C46

10U NP 35V

C47

10U NP 35V

3

2

1

84 U6:A

NE5532

5

6

7

U6:B

NE5532

3

2

1

84 U7:A

NE5532

5

6

7

U7:B

NE5532

3

2

1

84 U8:A

NE5532

5

6

7

U8:B

NE5532

R5547K

R5647K

R6547K

R66100K

R67100K

R68100K

+15V

-15V

C51

10U NP 35V

C52

10U NP 35V

C53

10U NP 35V

R69100K

R70100K

R71100K

R7247K

R7347K

R7447K

+15V

+15V

+15V

-15V

-15V

-15V

C60

10U NP 35V

3

2

1

84 U18:A

NE5532

R76100K

R7747K

5

6

7

U18:B

NE5532

C62

10U NP 35V

R78100K

R7947K

-15V

+15V

HUB 1L

HUB 2L

HUB 3L

HUB 4L

HUB 5L

HUB 6L

HUB 7L

HUB 1R

HUB 2R

HUB 3R

HUB 4R

HUB 5R

HUB 6R

HUB 7R

HUB 1L

HUB 2L

HUB 3L

HUB 4L

HUB 5L

HUB 6L

HUB 7L

HUB 1R

HUB 2R

HUB 3R

HUB 4R

HUB 5R

HUB 6R

HUB 7R

+15V

-15V

J1

TERMINAL

GROUND TERMINAL

3

2

1

84 U9:A

NE5532

R75100K

R8047K

-15V

+15V

TAPE RETN R

5

6

7

U9:BNE5532

R81100K

R8247K

TAPE RETN L

C69

10U NP 35V

C70

10U NP 35V

TAPE RETN L TAPE RETN R

HUB IN R

1

2

3

4

5

6

CN10

JST 2,5MM B6B-XH-A

GND

1

2

3

4

5

6

7

8

9

10

CN6

FFC 10WAY

C68

10U 16V NP

C61

10U 16V NP

C50

10U 16V NP

C49

10U 16V NP

C48

10U 16V NP

C42

10U 16V NP

C40

10U 16V NP

C77

10U 16V NP

C37

10U 16V NP

C35

10U 16V NP

C57

10U 16V NP

C58

10U 16V NP

C59

10U 16V NP

C63

10U 16V NP

C66

10U 16V NP

C1110U 16V NP C12

10U 16V NP

C71

10U 16V NP

+5V POWER TO HUB

P1

PAD

R85

100R

C72

100nF 100V

C16

47N PE 63V

C17

47N PE 63V

C34

47N PE 63V

C33

47N PE 63V

C4347N PE 63V

C44

47N PE 63V

C5447N PE 63V

C5547N PE 63V

C56

47N PE 63V

C6447N PE 63V

C6747N PE 63V



AP16361/3 Input PCB Schematic (Input Control)

1

2

RL1:A

RELAY

1

2

RL2:A

RELAY

1

2

RL3:A

RELAY

1

2

RL4:A

RELAY

1

2

RL5:A

RELAY

1

2

RL6:A

RELAY

1

2

RL7:A

RELAY

IN11

IN22

IN33

IN44

IN55

IN66

IN77

GND8

COM9

OUT710

OUT611

OUT512

OUT413

OUT314

OUT215

OUT116

U16

ULN2003A

+9V

+9VLOGIC GND

INPUT 1 INPUT 2 INPUT 3 INPUT 4 INPUT 5 INPUT 6 INPUT 7

1

2

RL8:A

RELAY

TAPE MONITOR

Q1BC337

D11N4001

R11

10K

INPUT PCB - PREAMP PCB

TO PREAMP LEFT

TO PREAMP RIGHT

+15V

-15V

+5V

+9VLOGIC GND

PREAMP OUT L

PREAMP OUT R

C65100nF 100V

LOGIC GND

+5V

LOGIC GND

1

2

3

4

5

6

7

8

CN8

FFC 08WAY

FROM FRONT PANEL PCB

1

2

3

4

5

6

CN9

JST 2,5MM B6B-XH-A

1

2

3

4

5

6

7

8

CN7

FFC 08WAY



AP16361/3 Input PCB Schematic (Input Amplifier)

TO PREAMP RIGHT

TO PREAMP LEFT

5

6

7

U2:B

NE5532

5

6

7

U4:B

NE5532

C1822p

C1922p

R481k

R491k

R501k

R511k

R52100K

R53100K

R54100K

INPUT AMPLIFIER

+ 6 dB

INPUT L

INPUT R

C9

1000uF 10V EL

C10

1000uF 10V EL

R39100K

R83

47R

R84

47R

C21

10U 16V NP

C20

10U 16V NP

+15V

-15V

+15V

-15V

D2

1N4001



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

AP16362/3

INP

UT

1

INP

UT

2

INP

UT

4

R32

LR

RL1

LRLRLR

RL2

R21

R5

U1

R12

R1

R2

R3

R4

R1

5

RL3 RL4

R13

U14

R57

R58

R59

R6

0

R6

1

R6

2

R6

3

R64

R6

R2

0

INP

UT

5

INP

UT

6IN

PU

T7

TAPE OUTR

LRL

RLR

LR

L

R TA

PE

RE

TU

RN

PREAMP OUT

RL5 RL6 RL7

RL8

R7

R30

R28

R29

R24

R2

5

R19

R16

R17

R18

R10

R31

R33

C1

U4

R5

3R52

R54

R48

R49

R50

R51

C18

C19

C16

C17

C2

C5

C6

C3

R23

C4

C7

C8

R11

U16

R8

R26

R27

R22

C13

C14

R37

R36

R9

U2

R38

R3

5

R39

C15

C2

2

C2

3

C24

C2

5

C2

6

C27

C28

C29

C30

C31

C32

C33

C34

R42

C3

8

R44

R45

C39

R43

U3

R41

C36

C41

U5

R46

R40

R47

C43 C44

L

C51

C52

C45

C46

C4

7

C5

3

C6

0

C6

2

U7

U8

U6

U18C54 C55 C56 C64

R67

R68

R66

R69

R70

R71

R72

R76

R78

R5

5

R56

R65

R7

3

R74

R77

R79

C65

AP16362/3

TO

HU

BP

CB

HUB SWITCHER

RELAY DRIVER LOGIC

C11

C12

C20

C21

C35C37 C40 C42 C48 C49 C50C57 C58 C59 C61C63

C66

C67

C68

C69C70

C71

C77

CN

6C

N7

CN

8

CN

9

CN

10

R14

R75

R80

R81

R82

R83

R84

U9

C9C10

TO

PR

EA

MP

PC

BC

N1

1

CN

9T

OP

RE

AM

PP

CB

R34

J1Q1

D1

FR

OM

FR

ON

TP

AN

EL

PC

B

INP

UT

3

C72P1

R85

CN1CN2

CN3CN4

CN5



AP16361/3 Input Board PCB Board Layout (Bottom Side)To enhance viewing, please print to A3 17

AP16364/3

setoNtnedItnenopmoCytQepyT/noitpircseDeulaVoNPA

RESISTORS48R,38R,41R,3R4mliFlateMW521.0R74

58R,43R,32R,22R,91R,9R6mliFlateMW521.0R001

81mliFlateMW521.0K1R4, R5, R8, R10, R15-R18, R26, R27, R31, R33, R36, R37, R48-R51

46R,36R,06R,95R,11R5mliFlateMW521.0K0126R,16R,85R,75R4mliFlateMW521.0K02

31mliFlateMW521.0K74R41, R43, R44, R46, R55, R56, R65, R72-R74, R77, R79, R80, R82

02mliFlateMW521.0K001R35, R38-R40, R42, R45, R47, R52-R54, R66-R71, R75, R76, R78, R81

41mliFlateMW521.0K022R1, R2, R6, R7, R12, R13, R20, R21, R24, R25, R28-R30, R32

CAPACITORS91C,81C,8C-5C6mm3=hctiP%01V05cimareCFp22

23C-22C,51C-31C41mm3=hctiP%01V05cimareCFp74

11mm5=hctiPretseyloP%01V36Fn74C16, C17, C33, C34, C43, C44, C54 -C56, C64, C67

27C,56C,3C,4C,2C,1C6mm5=hctiP%01V05cimareCFn001

10uF16V Non Polarised Electrolytic Radial (5.2mm) Pitch= 2.5mm

20C11, C12, C20, C21, C35, C37 C40, C42, C48-C50, C57-C59, C61, C63, C66, C68, C71, C77


14C36, C38, C39, C41, C45-C47, C51-C53, C60, C62, C69, C70

1000uF10V Electrolytic Radial (10mm) Pitch= 5mm

2 C9, C10

SEMICONDUCTORSegakcaP82POS1U1yarrAhctiwSeugolanAFA3619CT674YP

PY1162 NE5532 Low Noise Dual Audio Op-Amp (SMT) 10 U3, U5-U9, U18, U2, U4, U14 SO8 PackageegakcaP61LID61U1srevirDnotgnilraD7A3002NLU8511YP

TRANSISTORSegakcaP29OT1Q1langiSllamSNPN52-733CB412YP

DIODES14OD1D1edoiD1004N1

MISCELLANEOUS5NC-1NC5ONOHPTEKCOSONOHPDAUQ

01NC,9NC2redaehlacitreVA-HX-B6BMM5.2TSJInput 1 audio conn, i/o conn

8NC,7NC280-VSS-001DYAW-8CFF0411YPVertical FFC conn, reverse-needle type

6NC101-VSS-001DYAW-01CFF3411YPVertical FFC conn, reverse-needle type

8LR-1LR8CDV99-2-EMYALER

Cambridge Audio Azur 840A Amplifier Input PCB BOM

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

18


AP16365/4 Preamp PCB Schematic (Relay Logic)

1

2

RL1:A

RELAY

1

2

RL2:A

RELAY

1

2

RL3:A

RELAY

1

2

RL4:A

RELAY

1

2

RL5:A

RELAY

1

2

RL6:A

RELAY

1

2

RL7:A

RELAY

1

2

RL8:A

RELAY

+9V

+9V

RSW1

RSW2

R

L

GND

LSW1

LSW2

2

4

3

1

7

8

5

CN1

HEADPHONE JACK

+5V

TIP = LEFT

RING = RIGHT

PHONES DETECTPHONES GND

VOL 1 VOL 2 VOL 3 VOL 4 VOL 5 VOL 6 VOL 7 VOL 8

IN11

IN22

IN33

IN44

IN55

IN66

IN77

GND8

COM9

OUT710

OUT611

OUT512

OUT413

OUT314

OUT215

OUT116

U4

ULN2003A

IN11

IN22

IN33

IN44

IN55

IN66

IN77

GND8

COM9

OUT710

OUT611

OUT512

OUT413

OUT314

OUT215

OUT116

U5

ULN2003A

+9V

1

2

RL9:A

RELAY

1

2

RL10:A

RELAY

1

2

RL11:A

RELAY

VOL 9 VOL 10 VOL 11

1

2

RL12:A

RELAY

1

2

RL13:A

RELAY

1

2

RL14:A

RELAY

VOL 12 VOL 13 VOL 14

+9V

INPUT PCB - PREAMP PCB FRONT PCB - PREAMP PCBA C

+15V

-15V

+5V

+9V

LOGIC GND

+5V

LOGIC GND

IR RX

PHONES DETECT

OVERLOAD

CLIP DETECT

DC OFFSET

MAINS FAIL

HIGH VOLUME

LOW VOLUME

ELBACELBAC

R19100K

LOGIC GND

ON/STBY LED CONTROL

ON/STBY LED

R20430R

LOGIC GND

R21430R

PHONES R

PHONES LIN1

1

IN22

IN33

IN44

IN55

IN66

IN77

GND8

COM9

OUT710

OUT611

OUT512

OUT413

OUT314

OUT215

OUT116

U7

ULN2003A

+9V

1

2

RL15:A

RELAY

1

2

RL16:A

RELAY

1

2

RL17:A

RELAY

BAL L BAL R BAL1

HI = PHONE JACK OUT

1

2

RL18:A

RELAY

BAL 2

MAINS ON/OFF RELAYINRUSH RELAY

+5V3

OPT1

GND2

U10

TSOP18 IR RX

C19100n ceramic

IR RECEIVER

TSOP1836/37

+5V

LOGIC GND

IR RX

1

2

RL19:A

RELAY

BAL 3

R10022K

R10447R

C2010U 16V

C27

100n ceramic

+5V

LOGIC GND

C28

100n ceramic

C29

100n ceramic

ULN2003 DECOUPLERS

ON/STBY LED

LOGIC GND

LOGIC GND

LOGIC GND

1

2

3

4

5

6

7

8

CN6

CONN-H8

1

2

3

4

5

6

7

8

CN8

CONN-H8

1

2

3

4

5

6

7

8

CN9

CONN-H8

XD ON/OFF

OUTPUT RELAY A

OUTPUT RELAY B

SHIFT REGISTER CONNECTOR



LO = MAINS ON

1

2

3

4

5

6

7

8

9

10

11

12

CN2

CONN FFC-12

+15V

OVERTEMP

1

2

3

4

5

6

7

8

CN11

CONN FFC-8




SPEAKER TEST

Q1BC337

Q2BC337

R8322K

R11010K

+5V

R1114K7



AP16365/4 Preamp PCB Schematic (Tone Control)

R14K7

R21K1

R31K1

R42K2

R52K2

C2680n poly

C3

10pF

SW1:B

SW-DPDT

DEFEAT

-15V

+15V

R64K7

R71K1R8

1K1

R92K2

R102K2

C5680n poly

C6

10p

SW1:A

SW-DPDT

DEFEAT

5

6

7

U1:B

NE5532

3

2

1

84

U2:A

NE5532

R1147k

R1247k

R1347k

R1447k

46

5

VR1:B

ALPHA RD902PF

13

2VR1:A

ALPHA RD902PF

46

5

VR2:BALPHA RD902PF

13

2

VR2:A

ALPHA RD902PF

TONE CONTROL

TREBLE

BASS

TREBLE

BASS

3

2

1

84

U1:A

NE5532

5

6

7

U2:B

NE5532

R15

2K2

R162K2

R17

2K2

R18

2K2

TO VOLUME LEFT

+15V

-15V

6

7

8

RL19:C

RELAY

R22150R

R1052K2

R86390R

R872K2

R881K

R892K2

3

4

5

RL17:B

RELAY

3

4

5

RL18:B

RELAY

3

4

5

RL19:B

RELAY

6

7

8

RL18:C

RELAY

6

7

8

RL17:C

RELAY

6

7

8

RL16:C

RELAY

R90150R

R912K2

R92390R

R932K2

R941K

R952K2

2.5 dB 3.75 dB 5.5 dB

BALANCE CONTROL

+15V

-15V

R85

390R

R96

390R

R97150R

R98150R

3

4

5

RL15:B

RELAY

6

7

8

RL15:C

RELAY

5

6

7

U9:B

NE5532

TO VOLUME RIGHT3

2

1

84

U9:A

NE5532

3

4

5

RL16:B

RELAY

R9947K

R10147K

R10247K

R10347K

BALANCE BUFFER

LEFT

RIGHT

PREAMP OUT L

PREAMP OUT R

1

2

3

4

5

6

CN3

JST 2,5MM B6B-XH-A

C18

10U NP 16V

C24

10U NP 16V

C10

470U 10V EL

C12

470U 10V EL

C9

470U 10V EL

C11

470U 10V EL

C21

1000U 10V EL

C25

1000U 10V EL

C8

47N PE 63V

C13

47N PE 63V

C14

47N PE 63V

C1547N PE 63V

C2247N PE 63V

C36

100pF

C37

100pF

C38

1N PE 63V

C11N5 PE 63V

C41N5 PE 63V

C39

1N PE 63V

P1

PAD

GROUND REINFORCE



AP16365/4 Preamp PCB Schematic (Post Amp)

3

2

1

84

U12:A

NE5532

5

6

7

U12:B

NE5532

R75

390R

R76

390R

R7747K

VOL OUT LEFT

R78

390R

R79390R

R8047K

VOL OUT RIGHT

OUTPUT RELAY A

MAINS FAIL

R81

220R

R82

220R

PHONES L

PHONES R

+5V

+9V

LOGIC GND

PREAMP PCB - POWER AMP LEFT PCB CONNS

PREAMP PCB - POWER AMP RIGHT PCB CONN

CLIP DETECT

OVERLOAD

DC OFFSET

OVERTEMP

LOGIC GND

D35V1

OUTPUT RELAY B

INRUSH RELAY

MAINS ON/OFF RELAY

PHONES GND

R84 47K

HI = NORMAL

HI = NORMAL

HI = NORMAL

HI = NORMAL

1

2

3

4

5

6

7

8

9

10

11

12

CN5

FFC 12WAY

XD ON/OFF

XD ON/OFFLO = ON

+15V

-15V

POST AMPLIFIER

CLIP

OVERLOAD

DC OFFSET

OVERTEMP

AUDIO TO L POWER AMP

AUDIO TO R POWER AMP

LOGIC GND

+5V

+9V

PREAMP PCB - PSU PCB CONN

+15V

-15V

C23100nF ceramic

C26

100nF ceramic

C710u 25V

C3010u 25V

OPAMP DECOUPLING

R106

470RPREAMP OUT L

R10747K

R108

470RPREAMP OUT R

R10947K

1

2

CN10

JST 2.5MM B2B-XH-A

1

2

CN12

JST 2.5MM B2B-XH-A

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

CN4

FFC 16WAY

SPEAKER TESTSPEAKER TEST

C16

10U NP 16V

C17

10U NP 16V

C31

47U NP 25V

C32

47U NP 25V

MAINS FAIL INMAINS FAIL IN

D21N4148

D11N4148

C33

18 pF

C34

15 pF

C3547N PE 63V

-15V

P2

PAD

GROUND REINFORCE

P3

PAD



AP16365/3 Preamp PCB Layout (Top Side)

RL1 RL2 RL3 RL4 RL6 RL7RL5 RL8 RL10 RL11 RL12RL9 RL13 RL14

PHONES

RL15RL16

R2

3

R24

R49

R50

VR1VR2

R25

R26

R51

R52

R5

3R

54

R5

6

R5

8

R5

9

R6

0

R6

1

R6

2

RL18RL17 RL19

R27

R2

8

R2

9

R3

0

R3

1

R3

2

R5

7

R3

3

R3

4

R3

5

R3

6

R3

7

R3

8

R3

9

R4

0

R4

1

R4

2

R4

3R

44 R45

R46

R47R48

R6

3

R6

4

R6

5

R6

6

R6

7

R6

8 R69

R7

0 R71

R7

2

R73R74

U5U4 U7

U10

U9

U12

C1

8

R9

9

C21R103

R7

7

R7

5

R7

6

R7

8

R7

9

R8

0

R8

1

R8

2

C1

6

C1

7

C2

4

C25R102

C15 C2

2

C2

3

C26U1

U2

R1

R2 R3

R4

R5

R6

R7

R8R

9

R10

R1

5

R1

6

R1

7R

18

R1

3

R14

R1

1

R1

2

C3

C6C8

SW1

C2

C5

C1

C4

C9

C10

C20

C1

9

R22

R8

5

R86

R8

7

R88

R89

R9

0R

91

R92

R93

R9

4

R95

R96

R97

R9

8

C11

C12

C1

3

C14

C27

C2

8

C2

9

CN1

CN5

R84D2

D3

Q1

R2

0

R2

1

R1

9

R1

00

R10

5

R1

04

R5

5

R1

01

C7 C30

C31C32

CN2

CN

3

CN6

CN

8

CN

9

CN10

CN11

CN12

D1

R106

R107

R108

R109

CN4

C33 C34

C3

5

Q2

R8

3

R1

10

C36

C37

C3

8

C39

R1

11

P1

P2

P3



AP16365/3 Pre-amp PCB Layout (Bottom Side)To enhance viewing, please print to A3 23

AP16368/4


RESISTORS37R,74R2mliFlateMW521.01R547R,84R2mliFlateMW521.0R15

89R,79R,09R,22R4mliFlateMW521.0R05107R,44R2mliFlateMW521.0R003

8mliFlateMW521.0R093R85, R86, R92, R96, R75, R78, R76, R79

27R,64R2mliFlateMW521.0R02649R,88R,36R,73R4mliFlateMW521.0K1

8R,7R,3R,2R4mliFlateMW521.01K117R,54R2mliFlateMW521.02K1

01mliFlateMW521.02K2R4, R5, R9, R10, R15-R18, R43, R69, R87, R89, R91, R93, R95, R105

111R,6R,1R3mliFlateMW521.07K416R,53R2mliFlateMW521.01K5

86R-46R,24R-83R11mliFlateMW521.0K0185R,65R,23R,03R4mliFlateMW521.0K02

26R,63R2mliFlateMW521.0K93

9mliFlateMW521.0K74R11-R14, R77, R80, R99, R101, R102, R103,

06R,43R2mliFlateMW521.0K5745R,82R2mliFlateMW521.0K2895R,33R2mliFlateMW521.0K06105R,42R2mliFlateMW521.0K00275R,13R2mliFlateMW521.0K00355R,92R2mliFlateMW521.0K02625R,62R2mliFlateMW521.0K028

35R,15R,72R,52R4mliFlateMW521.02M194R,32R2mliFlateMW521.01M5

401R,28R,18R3mliFlateMW52.0R7412R,02R2mliFlateMW52.0R034

801R,601R2mliFlateMW52.0R074011R1mliFlateMW52.0K01

001R,38R2mliFlateMW52.0K22901R,701R,48R3mliFlateMW52.0K74

91R1mliFlateMW52.0K001CAPACITORS

6C,3C2mm3=hctiP%01V05cimareCFp0143C1mm3=hctiP%01V05cimareCFp5133C1mm3=hctiP%01V05cimareCFp81

100pF Ceramic 50V 10% Pitch=3mm 2 C36, C37

1nFPolyester 63V 10%Pitch=5mm

2 C38, C39

1n5Polyester 63V 10%Pitch=5mm

2 C1, C4

53C,22C,51C,41C,31C,8C6mm5=hctiPretseyloP%01V36Fn74100nF Ceramic 50V 10% Pitch= 5mm 6 C19, C23, C26-C29680nF Polyester 100V 5% Pitch= 15mm 2 C2, C5

10uF25V Electrolytic Radial (5mm) Pitch= 2.5mm

2 C7, C30

10uF16V Electrolytic Radial (5.2mm) Pitch= 2.5mm

1 C20

10uF16V Electrolytic NP Radial (5.2mm) Pitch= 2.5mm

4 C16, C17, C18,C24,

47uF25V Electrolytic NP Radial (8.4mm) Pitch= 3.5mm

2 C31, C32

470uF10V Electrolytic Radial (8.4mm) Pitch= 3.5mm

4 C9-C12

1000uF10V Electrolytic Radial (10.4mm) Pitch= 5mm

2 C21, C25

PY259 NE5532 Low Noise Dual Audio Op-Amp 4 U1, U2, U9, U12 DIL08 Package81POSTsecalpeR01U1eludoMrevieceRRIXRRI81POST

egakcaP61LID7U,5U,4U3srevirDnotgnilraD7A3002NLU8511YPTRANSISTORS

29OT2Q,1Q252-733CB412YPDIODES

2D,1D2edoiDlangiSllamS8414N1

Cambridge Audio Azur 840A Amplifier Preamp PCB BOM

SEMICONDUCTORS

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

24

AP16368/4


Cambridge Audio Azur 840A Amplifier Preamp PCB BOM

.esaC53ODWm0043D1Wm0041V5edoidreneZ1V5C-97XZB

PY1156 RD902PF-20B6-30F-B5K-0C ALPHA B5K LINEAR POT 2 VR1, VR2 Retractable 9mm pot. With centre detent.

CK-6.35-04 7P HEADPHONE JACK SKT 1 CN1JST 2,5MM B2B-XH-A 2-way vertical header 2 CN10, CN12JST 2,5MM B6B-XH-A 6-way vertical header 1 CN3

PY1141 D100-SSV-12Flat-film connector 12-way, reverse-needle typeSingle row contacts

2 CN2, CN5


4 CN6, CN8, CN9, CN11


1 CN4

91LR-1LR91yaleRCDV9CDV99-2-EMA043nidesusA1WS1010-002020-2042TDPD-hctiwshsuP546YP

MISCELLANEOUS


25


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

TO MAIN TRANSFORMER

J1

BLUE/WHITE

J2

BROWN/BLACK

C11X1 10n

C12X1 10n

C13

X2 470N SUPPRESSION

F2

20MM T1AL

F3

20MM T1AL

D15

1N4002

D16

1N4002

D17

1N4002

D18

1N4002

J3

TERMINAL

BLACK

J4

TERMINAL

GREEN

J5

TERMINAL

GREYC15470u 35V

VI1

VO3

GN

D2 U2

7805

C1647u 16V

VI1

VO3

GN

D2

U37815

VI2

VO3

GN

D1

U47915

C18100u 25V

C19100u 25V

+5V PSU

C20100nF ceramic

PSU GND

+15V

-15V

PSU GND

MAINS ON/OFF RELAY

OPAMP SUPPLY

MICROCONTROLLER SUPPLY

TO POWER AMP SUPPLY LEFT

C23

X2 470N SUPPRESSION

ALTERNATIVE POSITIONS FOR

X-CAPS WITH DIFFERENT LEAD PITCHES

LIVE

NEUTRAL

+9V PSU

INRUSH CONTROLMAINS ON/OFF

+9V PSU

INRUSH CONTROL RELAY

C24

4700u 16V

RED

ORANGE

YELLOW

BROWN

BLUE

1

2

3

1

2

36 V

36 V

0V

117 DEG C

Primary

Secondary

230 V

0 V

GREEN4 38 V

5.5A

5.5A

100 mA

RED

ORANGE

YELLOW

1

2

3

36 V

36 V

0V

Secondary

GREEN4 38 V

5.5A

5.5A

100 mA

J6

TERMINAL

YELLOW

GREEN

VIOLET

BROWN

BLUE

3

4

5

1

2

17 V

17 V

0V

113 DEG C

Primary

Secondary 2

230 V

0 V

100mA

100mA

RED

ORANGE

1

2

7.5 V

0V

Secondary 1

500mA

RELAY SUPPLY

J7

TERMINAL

F4

20MM T1ALD19

1N4002

D20

1N4002

D21

1N4002

D22

1N4002

MAIN TRANSFORMER

STANDBY TRANSFORMER

J8

TERMINAL

J9

TERMINAL

C2515000uF-63V

C2615000uF-63V

+48V R

-48V R

J10

TERMINAL

J11

TERMINAL

J12

TERMINAL

ORANGE

BLACK

RED

J13

TERMINAL

D23

1N4002

C271000uF-50V

F7

T1A AL

LVD!

-51V R

POWER AMP SUPPLY RIGHT

3/64/5

RL3:B

ME14FW009HS

3/64/5

RL4:B

ME14FW009HS

1

2

RL3:A

ME14FW009HS

1

2

RL4:A

ME14FW009HS

R78

10R 10W WW

5

6

7

U1:B

LM393

D24

1N4002

MAINS FAIL IN

+5V IN

LOW = NORMAL

R794K7

R802K2

R8133K

C284U7 50V

+310 mV

MAINS FAIL

MAINS FAIL DETECT

(SEPARATE PCB)

MAINS ON/OFF

INRUSH

+15V

-15V

+15V

-15V

1

2

3

4

5

6

7

8

9

10

11

12

CN2

FFC 12WAY

PSU GND

C29 X1 10n

C30 X1 10n

C34X1 10n

C35X1 10n

C36

X1 10n

C37 X1 10n

F1

T6A3 AL

LVD!

6A3 for 230V

10A for 115V

J24

BROWN

LIVE

GROUND

NEUTRAL

MAINS IN

L

N

E

CN3

IEC-SOC

J25

BROWN

MAINS IN

LIVE

CHASSIS GND

PSU PCB

PSU PCB

PSU GND

+5V PSU+9V

0V

TO SHEET 1

R87

47K

J26BROWN

J27BROWN

NEUTRAL

NEUTRAL

D9

1N4001

D25

1N4001 R88

33R 1W

C17220uF 100V

MAINS SWITCH

ON REAR PANEL

+48V IN

-48V IN

0V INFROM RECTIFIER BOARD

C32

100nF ceramic

C22100nF ceramic

C31100nF ceramic

C33

4700u 16V

R95

2R2 0.5W

+600 mV

R7710K

AC

AC

MAINS FAIL IN

PSU GND

R96100K

MAINS FAIL RECTIFIER

GREEN

C141000U 35V EL



AP16373/4 Power Amplifier Right Channel

Q1MJE340

Q2MJE350

R110R

+48V R

-48V R

Q3

MPSA93

Q4MPSA93

Q5

MPSA93

Q6

MPSA93

Q7

MPSA43

Q8MPSA43

Q9MPSA43

Q10MPSA43

R2100R

R368R

R4100R

R5100R

R668R

R768R

R82K2

R956R

R101K8

R111K2

R1218R

R132K2

R14100R

Q11

BC337 R15

22K

C1

47U 16V

Q12MJE340

R17

100R

R18100R

R190R1

R200R1

R210R1

R220R1

R23

100R

R24100R

R250R1

R26

0R1

R27

2K2

NFB-R

NFB-R

R28

2R2 3WR2910R 3W

C20u1 POLYESTER

Q132SA1295

Q142SA1295

Q15

2SC3264

Q16

2SC3264

Q17

2SA1295

Q18MJE340

R30470R

R310R68

Q19

MPSA43

Q20

MPSA93

R3210R

R33

3K3

R34

3K6

D1

1N4148

D2

1N4148

-51V R R3547K

D3

1N4148

D4

1N4148

R364K7

R37100K

D5

1N4148

D61N4148

-48V R

+48V R

DC OFFSET

R3847K

HI = NORMAL

C322U 50V NP

DC OFFSET DETECT

R40

220R 3W C

R41

470R 1W C

PHONES OUT RIGHT

Q23MPSA43

R424K7

R4347K

R4447K

Q24MPSA93

R4547K

R464K7

D8

1N4148

R4747K

R48

22K CLIP

R49

16K

R5110K

R521K

R531K

R5416K

R55

16K

D101N4148

D111N4148

R56

2K2

R5722K

R58470R

R59470R

R601K1

R611K1

R62150R

R631K

R6410K

D121N4148

D131N4148

R6547K

3

4

5

RL1:B

RELAY

R6647K

C4220uF 80V

C5220uF 80V

R6722K

C747uF 35V

C847uF 16V

C947uF 16V

C10

100pF

Q27

MPSA93

Q28

MPSA93

Q29MPSA93

L1

1,7U 10A

+9V IN

1

2RL1:A

RELAY

R684K7

R6910K

3

2

1

84

U1:A

LM393

R701K8

+5V IN

R71

1M

Q31

BC337

D14

1N4002

R724K7

LOGIC GND

Q32

BC337

R73

10K

CLIP

DC OFFSET

+5V IN

PHONES OUT RIGHT

LOGIC GND

PREAMP PCB - POWER AMP PCB CONN

HI = NORMAL

R744K7

R7510K

R7610K

OUTPUT RELAY CONTROL

HI = NORMAL

RIGHT

3

4

5

RL2:B

RELAY

Q36

BC337

R3910K

1

2RL2:A

RELAY

Q33

BC337

D7

1N4002

R824K7

Q34

BC337

R83

10K

OUTPUT RELAY BOUTPUT RELAY A

R50

10KR85

10Kspare

Q35BC337

R1610K

R86

47K

J14RIGHT OUT A

J15GND RIGHT

J16RIGHT OUT B

J18LEFT OUT A

J20LEFT OUT B

J22

LEFT IN

6

7

8

RL2:C

RELAY

6

7

8

RL1:C

RELAY

LOW = NORMAL LOW = NORMAL

MAINS FAIL

OUTPUT RELAY A

OUTPUT RELAY B

13

2VR11K

D261N5404

D271N5404

R8910K

R9047K

C21

100nF ceramic

13

2

VR2

10K

R97100K

R98100K

D301N4148

D311N4148

R99

1K

C3810U NP 16V

+48V R

-48V R

DC OFFSET NULL

R100

22K

R93

2K7

D2812V

D29

12V

R942K7

R9175K

R9256K

R84

10K

BC337 MPSA43/93

E B C EBC

850R at 100degC

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

CN1

FFC 16WAY

1

2

CN4

JST 2.5MM B2B-XH-A

AMP IN RIGHT

SPEAKER TEST SENSE

SPEAKER TEST SENSE

MAINS FAIL INMAINS FAIL IN

XD ON/OFF

CLIP

OVERLOAD

DC OFFSET

OVERTEMP

SPEAKER TEST SENSE

PHONES R

OUTPUT RELAY A

OUTPUT RELAY B

MAINS FAIL

+5V

+9V

LOGIC GND

PHONES GND

100deg C cutout

OVERTEMP DETECT

OVERTEMP

XD ON/OFF

+850mV

TH1

ZPP22 100DEG

POSITIVE THERMISTOR

-48V R

D321N4148

D331N4148

D34

1N4148

J17GND RIGHT

Q21MPSA43

Q22MPSA93

Q25MPSA43

R1011K

+5V IN

C39100pF

CHASSIS GND

C40

10U 63V EL

Q26MPSA43

C6

1000U 10V EL

C41

4n7 COG



AP16373/3 Power Amp (Right) & PSU PCB Layout (Top Side)To enhance viewing, please print to A3 28


AP16373/3 Power Amp Right & PSU PCB Layout (Bottom Side)To enhance viewing, please print to A3 29

AP16376/7


RESISTORS910R 0.125 W Metal Film 1 R702K2 0.125 W Metal Film 1 R804K7 0.125 W Metal Film 5 R36 , R66, R68, R72, R74,10K 0.125 W Metal Film 6 R16, R69, R75, R76, R77, R85,22K 0.125 W Metal Film 1 R4833K 0.125 W Metal Film 1 R8147K 0.125 W Metal Film 2 R43, R90,100K 0.125 W Metal Film 1 R961M 0.125 W Metal Film 1 R7110R 0.25 W Metal Film 2 R1, R3218R 0.25 W Metal Film 1 R1256R 0.25 W Metal Film 1 R968R 0.25 W Metal Film 3 R3, R6, R7100R 0.25 W Metal Film 9 R2, R4-R5, R14, R17, R18, R23, R24,150R 0.25 W Metal Film 1 R62470R 0.25 W Metal Film 3 R30, R58, R591K 0.25 W Metal Film 6 R52-R53, R63, R80, R99, R1011K1 0.25 W Metal Film 2 R60, R611K2 0.25 W Metal Film 1 R11,1K8 0.25 W Metal Film 1 R10,2K2 0.25 W Metal Film 4 R8, R13, R27, R56, 2K7 0.25 W Metal Film 2 R93, R943K3 0.25 W Metal Film 1 R343K6 0.25 W Metal Film 1 R334K7 0.25 W Metal Film 3 R42, R46, R82

10K 0.25 W Metal Film 8R39, R50, R51, R64, R73, R83, R84, ,

R89,16K 0.25 W Metal Film 3 R49, R54, R5522K 0.25 W Metal Film 5 R15, R57, R67, R81, R100

47K 0.25 W Metal Film 8R35, R38, R44, R45, R47, R65, R66,R86

56K 0.25 W Metal Film 1 R9275K 0.25 W Metal Film 1 R91100K 0.25 W Metal Film 4 R37, , R97, R98

S88R1mliFlateMW1R33 pace off PCBS14R1nobraCW1R074 pace off PCB

0R1 3 W Wire Wound 6 R19-R22, R25, R26 S pace off PCBS13R1dnuoWeriWW35R1 pace off PCB

2R2 3 W Wire Wound 1 R28Inductor damping res.No need to stand off PCB

10R 3 W Wire Wound 1 R29220R 3 W Carbon 1 R40CAPACITORS

100pFCeramic 100V 10% Pitch= 3mm

1 C10, C39

10nF X1 CAPMEX103K300A02 Pitch =10mm

3 C11, C12, C20

100nFCeramic 100V 10% Pitch= 5mm

2 C18, C21

100nF Polyester Pitch= 10mm 1 C2

10uF16V Electrolytic Radial Non Polarised (6.4mm) Pitch= 5mm

2 C20, C38

10uF63V Electrolytic Radial(5mm diam) Pitch= 3.5mm

1 C40

22uF50V Non Polarised Electrolytic Radial (5.2mm)Pitch= 2.5mm

1 C3

Cambridge Audio Azur 840A Amplifier Power Amp Right PCB BOM


30

AP16376/7


Cambridge Audio Azur 840A Amplifier Power Amp Right PCB BOM


3 C1, C8, C9


1 C7


1 C17


2 C4


1 C6


1 C27


2 C25, C26

SEMICONDUCTORS

PY1152 LM393APLow-offset dual Comparator, A-version for low offset voltage

egakcaP80LID1U1

TRANSISTORSPY1148 MJ 621OT81Q,21Q,1Q3rotsisnarTrevirDNPN043EPY1150 MJ 621OT2Q1rotsisnarTrevirDPNP053EPY021 MPSA93 PNP Small Signal 10 Q3-Q6, Q20, Q22, Q24, Q27-Q29 TO92WIDE MPSA92 ma y be usedPY013 MPSA43 NPN Small Si gnal 8 Q7-Q10, Q19, Q21, Q23, Q26, Q25, TO92WIDE MPSA42 ma y be usedPY214 BC337-25 NPN Small Si gnal 9 Q11, Q31-Q36 TO92

PY1149 2SA1295 PNP Power Audio 3 Q13, Q14, Q17 MT200002TM61Q,51Q2oiduArewoPNPN4623CS27411YP

DIODES

1N4148 Small Signal Diode 18D1-D6, D8, D10-D13, D17, D18, D30 -D34

DIODE-IN4148

1N4002 General Purp akcaP14OD,32D,41D,7D3reifitceReso ge1N5404 General Purp akcaP72OD72D,62D2reifitceReso ge Clamp diodes

.esaC53ODWm00492D,82D2Wm004edoidreneZV2121C-97XZBMISCELLANEOUS

olanimoN1HT1ROTSIMREHTEVITISOPE105A122PZ perating temp 100 deg C

08-1950100-150 1.7uH 10A INDUCTOR 1 L110 turns of 1.5mm copper wire, diameter 20mm, length approx 20mm

MULTITURN PRESET 1K

Top adjust. Footprint 9.5 x 4.5 mm

1 VR1Set quiescent current. Insert so adj screw next to R17

MULTITURN PRESET 10K


1 VR2DC trimInsert so adj screw next to Q11

SS-7B-1 Wong Feng IEC-SOCKET 1 CN3

PY1151 D100-SSV-16

FFC CONNECTOR 16-WAY, Vertical "Reverse needle" type, Single row of contacts

1 CN1

4031-050100-001 Fuseholder 20mm 1 F7T1A AL FUSE-20MM 1A anti sur ge, 1 F7 WMZ12A( )-100S80FLS


31

AP16376/7


RESISTORSBCPffoecapS59R1mliFlateMW5.02R2

10R 10W8.5X53MMWireWound

BCPffoecapS.rotsiserhsurnI87R1BmhO01JW01NK

97R1mliFlateMW52.07K478R1mliFlateMW52.0K74

CAPACITORS10nF X1 Capacitor

MEX103K300A02 Pitch =10mm 6 C29, C30, C34-C37

100nF Ceramic 100V Pitch= 5mm 4 C20, C22, C31, C32

470nFX2 Suppression CAPBOX 27.5X13 Pitch= 27.5mm orBOX 22.5X10 Pitch= 22.5mm

1 C13 or C23 dependant on pitch

4u750V Electrolytic Radial (5.2mm) Pitch= 2.5mm

1 C28


1 C16


2 C18,C19


1 C15


1 C14


mm52THGIEHMUMIXAM33C,42C2

egakcaP022OT2U1rotalugeRraeniLA1tloV55087egakcaP022OT3U1rotalugeRraeniLA1tloV515187egakcaP022OT4U1rotalugeRraeniLA1tloV51-5197

DIODES1N4002 General Purpose Rectifier 9 D15-D22, D24 DO41 Package

egakcaP14OD52D,9D2reifitceResopruPlareneG1004N1

T1AL1A antisurge fuse 20mm (low breaking capacity)

3 F2 - F4

T6.3 AL or T10A6.3A or 10A antisurge fuse 20mm (low breaking capacity)

1 F1T6A3 for 230VT10A for 115V

4031-050100-001

,4,3,2,1F4mm02redlohesuF

4034-000030-000

1FredlohesufsniamnoecalP1F1revocredlohesuF

D100-SSV-12FFC CONNECTOR 12-WAY, Vertical "Reverse needle" type, Single row of contacts

1 CN2

PY1154 RELAY ME14FRELAY ME14F-9H16S SPST 16A 250 Vac9V coil

.syalerlortnochsurni&sniaM4LR,3LR2

SEMICONDUCTORS

MISCELLANEOUS

Cambridge Audio Azur 840A Amplifier PSU PCB BOM


32


AP16693/5 Power Amplifier Left Channel

Q1MJE340

Q2MJE350

R110R

+48V

-48V

Q3

MPSA93

Q4MPSA93

Q5

MPSA93

Q6

MPSA93

Q7

MPSA43

Q8MPSA43

Q9MPSA43

Q10MPSA43

R2100R

R368R

R4100R

R5100R

R668R

R768R R8

2K2

R956R

R101K8

R111K2

R1218R

R132K2

R14100R

Q11

BC337 R15

22K

R1610K

C1

47U 16V

Q12MJE340

R17

100R

R18100R

R190R1

R200R1

R210R1

R220R1

R23

100R

R24100R

R250R1

R260R1

R27

2K2

NFB-L

NFB-L

R28

2R2 3WR2910R 3W

C2

0u1 POLYESTER

Q132SA1295

Q142SA1295

Q15

2SC3264

Q16

2SC3264

Q17

2SA1295

Q18MJE340

R30470R

R310R68

Q19MPSA43

Q20

MPSA93

R3210R

R33

3K6

R34

3K3

D11N4148

D2

1N4148

-51V

R35

47K

D3

1N4148

D4

1N4148

R364K7

R37100K

D5

1N4148

D61N4148

LOGIC GND

LOGIC GND

-48V

+48V

DC OFFSET

HI = NORMAL

C322U 50V NP

DC OFFSET DETECT

R40

220R 3W C

R41

470R 1W C

PHONES L

Q23MPSA43

R424K7

R4347K

R4447K

Q24MPSA93

R4547K

R464K7

D8

1N4148

R4747K

R48

22K

CLIP

R49

16K

R50

47K

R5110K

R521K

R53

1K

R5416K

R5516K

D101N4148

D111N4148

R56

2K2

R5722K

R58470R

R59470R

R601K1

R611K1

R62150R

R631K

R6410K

D121N4148

D131N4148

R6547K

LEFT OUT

R66

10K

C4220uF 80V

C5220uF 80V

R6722K

C747uF 35V

C847uF 16V

C947uF 16V

C10

100pF

Q27

MPSA93

Q28

MPSA93

Q29MPSA93

L1

1,7U 10A

R684K7

R6910K

5

6

7

U1:B

LM393

R701K8

+5V

R71

1M

3

2

1

84

U1:A

LM393

100deg C cutout

CLIP

DC OFFSET

PREAMP PCB - LEFT POWER AMP PCB CONN

HI = NORMAL

R754K7

POSITIVE THERMISTOR

LEFT

MAINS FAIL IN

J5

TERMINAL

J6

TERMINAL

13

2VR11K

D71N5404

D91N5404

C18100n ceramic

R7275K

R7356K

R742K7

D1412V

D1612V

R762K7

13

2

VR2

10K

R78100K

R79100K

D17

1N4148

D18

1N4148

R80

1K

R81

22K

C2010U NP 16V

+48V

-48V

DC OFFSET NULL

1

2

CN3

JST 2.5MM B2B-XH-A

AMP IN LEFT

PHONES L

+5V

LOGIC GND

XD ON/OFF

CLIP

OVERLOAD

DC OFFSET

OVERTEMP

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

CN2

FFC 16WAY

SPEAKER TEST SENSE

Q31

MPSA93

R8247K

R83

10K

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

CN1

FFC 16WAY

LEFT POWER AMP TO

RIGHT POWER AMP CONNECTOR

PHONES R

OUTPUT RELAY A

OUTPUT RELAY B

MAINS FAIL

D19 1N4148

D20

1N4148

+5V

+9V

LOGIC GND

PHONES GND

R8510K

R86100R

R8710R

R88

100K

R894K7

SPEAKER TEST

R90

100R

D21

1N4002

D22

1N4002

R91 100R

LO = NO SHORT

SPEAKER SHORT CIRCUIT TEST SYSTEMOVERTEMP DETECT

XD ON/OFF

NORMAL = HI

BC337 MPSA43/93

E B C EBC

850R at 100degC

XD ON/OFF

CLIP

OVERLOAD

DC OFFSET

OVERTEMP

SPEAKER TEST

OUTPUT RELAY A

OUTPUT RELAY B

MAINS FAIL

+5V

+9V

LOGIC GND

MAINS FAIL IN

PHONES R

PHONES GND

50mW

50mW

210mW

50mW

PHONES L

TH1

ZPP22 100DEG

-48V

D23

1N4148

D241N4148

D251N4148

J7

TERMINAL

OUTPUT GROUND

E BC

MJE340,350

C14100pF

P1PAD

CHASSIS GND

Q21MPSA43

Q22MPSA93

Q26MPSA43

Q25MPSA43

Looking at pins

123

C61000U 10V EL

C15

4n7 50V COG



AP16693/5 Power Amplifier Left Power Supplies

+48V

-48V

J1

TERMINAL

J2

TERMINAL

J3

TERMINAL

POWER AMP SUPPLY LEFT

YELLOW

ORANGE

RED

RED

ORANGE

YELLOW

BROWN

BLUE

1

2

3

1

2

36 V

36 V

0V

115 DEG C

Primary

Secondary

230 V

0 V

GREEN4 38 V

5.5A

5.5A

100 mA

RED

ORANGE

YELLOW

1

2

3

36 V

36 V

0V

Secondary

GREEN4 38 V

5.5A

5.5A

100 mA

J4

TERMINAL

D15

1N4002

C111000uF 50V

F1

T1A AL

LVD!

-51V

MAIN TRANSFORMER

TO POWER AMP SUPPLY RIGHT

+-

C1215000U 63V

+-

C1315000U 63V

C17220uF 100V

R38

33R 1W

GREEN

+48V IN

-48V IN

+48V IN

0V IN

FROM RECTIFIER BOARD



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

AP

16694/4

Q13 Q14 Q15 Q16 Q17

Q2

R21 R22

R59

R64

R66

Q18

R30R31

R40

R41

C12

C13

U1

R68

R69

R70

R71

Q21

Q22

R37

C3D3

D5

R42R44

Q23

R45

R46

Q24

D8

R47

J1

J2

J3

J4

R25R26

J5

J6

OV

ER

TE

MPDC

OF

FS

ET

CLIP

DE

TE

CT

FIX1

FIX

3

FIX

2

R62

R60

R61

R65

R35

Q28

Q29

D6

D4

Q27

R48R43

R38

R36

R63

D12

D13

Q10

Q11

Q9

D1

Q20

Q25

R6

R7

R8

R9

R15

R13

Q5

Q6

Q7

Q8

C6

Q19

C9

C10

R23

R24

R34

R32

R49

R51

R53

R55

C7

C1

C8

Q3

R2

R4

R5

D2

R14

R27

R52

R54

R33

R56

R57

R67

R1

R17

R10

R11

R12

R3

Q4

D10

Q1

Q12

C2

C4

R29

R18

R19

L1

R20

C17

R28

R58

C11

D7 D9

D15

R50

R75

R16

AP

16694/4

RE

DB

LA

CK

OR

AN

GE

OU

TP

UT

GN

D

V+

0V

V-

D11

GR

EE

N38V

AC

BIA

SV

R1

R72

R74D14

R73

R76

D16

C18

CN3

D17

D18

VR

2

R78R79R80

R81

C20

F1

CN

1

CN

2

D21

D22

R86

R85

R87

R88

R91

R83

Q31R82

D19

D20

Q26

R89

R90

SP

KR

TE

ST

TH1

D24

D25

D23

RE

DB

LK

J7

GN

DB

LK

C14

P1



AP16693/5 Power Amp PCB Board Layout (Bottom Side)To enhance viewing, please print to A3 36

AP16696/9


RESISTORS10R 0.125 W Metal Film 1 R87100R 0.125 W Metal Film 3 R86, R90, R91910R 0.125 W Metal Film 1 R704K7 0.125 W Metal Film 6 R36, R42, R46, R68, R75, R8910K 0.125 W Metal Film 3 R69, R83, R8522K 0.125 W Metal Film 1 R48,47K 0.125 W Metal Film 4 R43, R44, R45, R50100K 0.125 W Metal Film 2 R37, R881M 0.125 W Metal Film 1 R7110R 0.25 W Metal Film 2 R1, R32,18R 0.25 W Metal Film 1 R1256R 0.25 W Metal Film 1 R968R 0.25 W Metal Film 3 R3, R6, R7

100R 0.25 W Metal Film 10R2, R4, R5, R14, R17, R18, R23, R24,

150R 0.25 W Metal Film 1 R62470R 0.25 W Metal Film 3 R30, R58, R591K 0.25 W Metal Film 4 R52, R53, R63, R80, 1K1 0.25 W Metal Film 2 R60, R611K2 0.25 W Metal Film 1 R11,1K8 0.25 W Metal Film 1 R102K2 0.25 W Metal Film 4 R8, R13, R27, R562K7 0.25 W Metal Film 2 R74, R763K3 0.25 W Metal Film 1 R343K6 0.25 W Metal Film 1 R3310K 0.25 W Metal Film 4 R16, R51, R64, R66,16K 0.25 W Metal Film 3 R49, R54, R5522K 0.25 W Metal Film 4 R15, R57, R67, R8147K 0.25 W Metal Film 5 R35, R47, R65, R73, R8256K 0.25 W Metal Film 1 R7375K 0.25 W Metal Film 1 R72100K 0.25 W Metal Film 2 R78, R79,

BCPffoecapS83R1mliFlateMW1R33BCPffoecapS14R1mm81=hctiPnobraCW1R074

0R1 3 W Wire Wound 6 R19-R22, R25, R26 Space off PCBBCPffoecapS13R1dnuoWeriWW35R1

2R2 3 W Wire Wound 1 R28Inductor damping res.No need to stand off PCB

BCPffoecapS.SERLEBOZ92R1dnuoWeriWW3R01

BCPffoecapS04R1mm5.22=hctiPnobraCW3R022

CAPACITORS

100pFCeramic 100V 10% Pitch= 3mm

2 C10, C14

100nFCeramic 100V 10% Pitch= 5mm

1 C18

100nF Polyester 10% Pitch= 10mm 1 C2


1 C20


1 C3

Cambridge Audio Azur 840A Amplifier Power Amp Left PCB BOM


37

AP16696/9


Cambridge Audio Azur 840A Amplifier Power Amp Left PCB BOM


1 C7

47uF16V Electrolytic Radial (5mm)Pitch= 2.5mm

3 C1, C8, C9


2 C4, C5


1 C17

1000uF10V Electrolytic Radial (10.4mm) Pitch=5 mm

1 C6


1 C11


2 C12, C13

PY1152 LM393APDual differential comparator, A-version for low offset voltage

80LID1U1

TRANSISTORS

PY1148 MJE340 NPN Power Transistor 4 Q1, Q12, Q18, Q30 TO126621OT2Q1rotsisnarTrewoPPNP053EJM0511YP

PY021 MPSA93 PNP High Voltage 11Q3-Q6, Q20, Q22, Q24, Q27-Q29, Q31

TO92WIDE MPSA92 may be used

PY013 MPSA43 NPN High Voltage 9Q7-Q10, Q19, Q21, Q23, Q25, Q26

TO92WIDE MPSA42 may be used

29OT11Q1langiSllamSNPN52-733CB412YPPY1149 2SA1295 PNP Power Audio 3 Q13, Q14, Q17 MT200PY1147 2SC3264 NPN Power Audio 2 Q15, Q16 MT200

DIODES

1N4148 Small Signal Diode 18D1-D6, D8, D10-D13, D17-D20, D23-D25

72OD9D,7D2reifitceResopuPlareneG4045N11N4002 General Pupose Rectifier 3 D15, D21, D22 DO41ZENER 12V 400mW

Zener BZX79-C12 2 D14, D16 400mW DO35 Case.

Cged001pmetgnitarepolanimoN1HT1ROTSIMREHTEVITISOPE105A122PZMULTITURNPRESET 1K


1 VR1Set quiescent current. Insert so adj screw next to R12

MULTITURNPRESET 10K


1 VR2DC trimInsert so adj screw next to R78

PY1151 D100-SSV-16FFC CONNECTOR 16-WAY, Vertical "Reverse needle" type, Single row of contacts

2 CN2

T1A AL 1 Amp 20mm antisurge fuse 1 F1

4031-050100-001 Fuseholder 20mm 1 F1

08-1950100-150 1.7uH 10A INDUCTOR 1 L110 turns of 1.5mm copper wire, diameter 20mm, length approx 20mm

AP16831/3 To drawing Main heatsink 1 Q13, 14, 15, 16, 17

SEMICONDUCTORS

MISCELLANEOUS


38


AP163771/3 Hub PCB Schematic

3

2

1

84

U1:A

NE5532

5

6

7

U1:B

NE5532

C1

100nF

+24V

R1

47R

R2

47R

R3

12K

R4

4K7

C2

10pF

R5

12K

C3

10pF

ABUS GND

R612K

C4

10uF 25V

C5

10uF 25V

ABUS GND

Q1BC327

R7

100R

R8

100R

R94K7

R1010K

R11

22K

C6

100nF

R12 100R

VI1

VO3

GN

D2

U27812

C7100nF

C8

10uF 25V

ABUS GND

R13

10R 2W

D3

1N4004

+12V

R14

4K7

+12V

3

2

1

84

U3:A

NE5532

5

6

7

U3:B

NE5532

C12

100nF

+24V

R15

47R

R16

47R

R17

12K

C13

10pF

R18

12K

C14

10pF

ABUS GND

C15

10uF 25V

C16

10uF 25V

ABUS GND

ABUS GND

R

GND

L

GND

IR

STATUS

+24V

0V

+5V3

OPT1

GND2

U4

TSOP1837 IR RECEIVER

R1947R

C17

100nF

C18

10uF 16V

R20470R

D5

1N4148

D6

1N4148

D7

BZX79C2V7

D8

BZX79C2V7

R2110K

ABUS GND

R22

100R

R23

100R

R2427KR25

27K

ABUS GND

CN4IR EMITTER OUTPUTS

R26

4K7

R27

4K7

R2810K

ABUS GND

R2912K

SIG GND

C20

47U 25V

R3012K

C21

47U 25V

R3112K

C22

47U 25V

R32

4K7

R33

4K7

SIG GND

STATUS

IR

HUB - INPUT PCB CONN

LOGIC GND

SIG GND

Q2BC337

+5V

LOGIC GND

ABUS GND

RIGHT

LEFT

SWITCHER DATA OUT

SWITCHER CLOCK OUT

SWITCHER STROBE OUT

LOGIC GND

+5V

RA7/OSC1/CLKIN16

RB0/INT6

RB1/RX/DT7

RB2/TX/CK8

RB3/CCP19

RB4/PGM10

RB511

RB6/T1OSO/T1CKI12

RB7/T1OSI13

RA0/ANO17

RA1/AN118

RA2/AN2/VRef1

RA3/AN3/COMP12

RA4/T0CKI/CMP23

RA6/OSC2/CLKOUT15

RA5/MCLR/THV4

VSS

5V

DD

14

U5 PIC16F627-04/P

LOGIC GND

C23100nF

LOGIC GND

+5V

R35

100R

R36

100R

R3727KR38

27K

ABUS GND

CN6IR EMITTER OUTPUTS

Q3BC337

+12V

R394K7

ABUS GND

C24

47U 25V

R40

4K7

R41

4K7

+24V IN

78L12

IN OUT

LOOKING AT LEADS

C28

47uF 25V

C25

47U 25V

C26

47U 25V

C27

47U 25V

F1

POLYFUSE 1-1A

F2

POLYFUSE 1-1AR4210K

R4310K

C1010uF 16V

GND1+G

+2

-

3

CN7

XLR FEMALE

GND1+G

+2

-

3

CN8

XLR FEMALE

IR OUTIR IN

IR IN

IR IN

CN9

JACK-CKX-3.5-12

3.5mm JACK

+5

V3

OP

T1

GN

D2

U6

TSOP1836 IR RECEIVER

+5V

LOGIC GND

R44

220R

1

2

3

U7:A

4011

VDD=+5V

R45

220R

1

2

6

5

4NC

3

U8

OP4N25

5

6

4

U7:B4011

VDD=+5V

VSS=LOGIC GND

8

9

10

U7:C

4011

VDD=+5V

12

13

11

U7:D

4011

VDD=+5V

R46220K

R4710K

R48

10K

+5V

LOGIC GND

R492R2

R50

100R

Q4BC337

R5110K

LOGIC GND

C11100nF

LOGIC GND

1

3

2 CN2

RICCO PCB JACK

C29100nF

INPUT 1 LEFT +

INPUT 1 LEFT -

XLR GND

INPUT 1 RIGHT +

INPUT 1 RIGHT -

LEFT

RIGHT

INPUT 1: BALANCED INPUTS

SIG GND

+5V

LOGIC GND

C30100nF CERAMIC

FEMALE

RS232 & IR CABLE FROM FRONT PANEL PCB

TX

RX

9

10

11

12

13

14

15

16

CN1:B

VERT2RJ45

GND17

GND218

GND319

GND420

GND521

GND622

CN1:C

VERT2RJ45

CHASSIS GND

A-BUS A

A-BUS B

1

2

3

4

IR IN

36K

36K

GND

GND

MCLR HUB

PGM

MCLR HUB

RS232 CONN

PROGRAM_DATA

PROGRAM_CLK

PROGRAM_DATA

PROGRAM_CLK

R3447R

C3110uF 16V

C32100nF

C3347pF

ABUS GND

C3447pF

ABUS GND

C3547pF

ABUS GND

C3647pF

ABUS GND

4

3

2

1

CN16

CONN-2.5PH-SIL4

RX

TX

GND

CHAS

+24V

37 kHz

36 kHz

TOP OF CONN

BOTTOM OF CONN

Q5

BC337

R5210K

R53100K

Q6BC337

R5410K

PIC TX

BLOCK

HUB CLOCK OUT

HUB DATA OUT

HUB CLOCK OUT

HUB DATA OUT

1

2

3

4

5

6

7

8

9

10

12

13

11

CN15

FFC 13WAY

LOGIC GND

PGM

IR receiver

A

K

D2

CA IR DEMODULATOR

IR receiver

A

K

D1

CA IR DEMODULATOR

1

2

3

4

5

6

CN5

JST 2,5MM B6B-XH-A

XLR GND

CONN TO INPUT PCB

1

2

3

4

5

6

7

8

9

10

CN3

FFC 10WAY

HUB IN RHUB IN L

RIGHT

RIGHT

LEFT

LEFT

R

GND

L

GND

IR

STATUS

+24V

0V

STATUS LINE DRIVER

R5510K

ABUS GND

XLR GND

1

2

3

4

5

6

7

8

CN1:A

VERT2RJ45

R56390K

R57100K

LOGIC GND

+24V IN

+24V IN

+24V DETECT

1

2

5

CN10:AAV2-8,4-14/EC

3

4

5

CN10:BAV2-8,4-14/EC

C39

1N 50V NP0

R5810K

+5V

F3

POLYFUSE 1-1A

CHASSIS GND

R5947K

R6047K

C9220U 35V EL

C19220U 25V EL

C37220U 25V EL



AP16377/3 Hub PCB Layout (Top Panel)

AP16378/3

AP16378/3

TX

RX

GN

D

CH

AS RS232



AP16377/3 Hub PCB Layout (Bottom Panel)To enhance viewing, please print to A3 41

AP16380/5


RESISTORS61R,51R,2R,1R4mliFlateMW521.0R74

9mliFlateMW521.07K4R4, R9, R14, R26, R27, R32, R33, R40, R41

01mliFlateMW521.0K01R10, R28, R42, R43, R47, R48, R51, R52, R54, R55

13R-92R,81R,71R,6R,5R,3R8mliFlateMW521.0K2111R1mliFlateMW521.0K22

83R,73R,52R,42R4mliFlateMW521.0K7265R,35R2mliFlateMW521.0K001

75R1mliFlateMW521.0K09394R1mliFlateMW52.02R2

43R,91R2mliFlateMW52.0R74

8mliFlateMW52.0R001R7, R8, R12, R22, R23, R35, R36, R50

54R,44R2mliFlateMW52.0R02202R1mliFlateMW52.0R07493R1mliFlateMW52.07K4

85R,15R,12R3mliFlateMW52.0K0106R,95R2mliFlateMW52.0K74

BCPffoecapS31R1dnuoWeriWW2R01CAPACITORS

41C,31C,3C,2C4mm3=hctiP%01V05cimareCFp0163C-33C4mm3=hctiP%01V05cimareCFp74

01mm5=hctiP%01V05cimareCFn001C1, C6, C7, C11, C12, C17, C23, C29, C30, C32

10uF16V Electrolytic Radial (6.4mm)Pitch =2.5mm

3 C10, C18, C31


5 C4, C5, C8, C15, C16


8 C20-C22, C24-C28


2 C19, C37


1 C9

SEMICONDUCTORS80LID3U,1U2pmApOlaudesionwoL2355EN952YP

CD4011BETexas Instruments Quad NAND gate IC

NCB1104DCimeslanoitaNsievitanretlA7U1

022OT2U1022OT,rotalugerA1,V21218760LID8U1rotalosiotpO52N4PO4411YP

PIC16F627 -04/P PIC Microcontroller 1 U5DIL18Contact Audio Partnership Service Department

)7381POSTsecalpeR(V81POST4U1eludoMrevieceRRIzhK7373843POST7001YP)6381POSTsecalpeR(V81POST6U1eludoMrevieceRRIzhK6363843POST557YP

TRANSISTORS29OT1Q1langiSllamSPNP52-723CB912YP29OT6Q-2Q5langiSllamSNPN52-733CB412YP

DIODES1N4004 General Purpose Rectifier diode 1 D3

PY962 MV50640 2D,1D2DELdeRNO ALTERNATIVE LED TO BE USEDFitted as part of assembly with AP17339/3

1N4148 Small Signal Diode 2 D5, D6BZX79C2V7 Zener Diode 2.7 Volts 2 D7, D8MISCELLANEOUSAJ-600-21-F-4-B Allsun Dual vertical RJ45 1 CN1RDC-020-05 DC power in connector 1 CN2

STUPTUORETTIMERI6NC,4NC2)neerg(tekcoskcajmm5.3lauD01-5.3-XKCJY-5033P*030 Female XLR socket with gold pins 2 CN7, CN8CKX-3.5-12 Single 3.5mm jack socket (black) 1 CN9

Cambridge Audio Azur 840A Amplifier Hub Board BOM


42

AP16380/5


Cambridge Audio Azur 840A Amplifier Hub Board BOM

AV2-8,4-14/ECDual phono socket with EMC gndOrange inserts

1 CN10

PY1143 D100-SSV-10Vertical FFC conn, reverse-needle typesingle-row contacts 10-way

1 CN3

PY1142 D100-SSV-13Vertical FFC conn, reverse-needle typesingle-row contacts 13-way

1 CN15

mrofelbacnnoc232SRroF61NC1HXepytredaehlacitrevTSJ4LIS-HP5.2-NNOCtupnidecnalabroF5NC1HXepytredaehlacitrevTSJ6LIS-HP5.2-NNOC

AP17339/3 IR Receiver Housing 2 Fit over D2/U4 and D1/U6

3F,2F,1F3U011P03DLRA1-1ESUFYLOPPOLYFUSE 1.1A 30Vdc 7.4*14.2*3MM 6.6Sec


43


AP17575/2 Rectifier PCB Schematic

F1

T6A3 AL

LVD!

F2

T6A3 AL

LVD!

J1

TERMINAL

J2

TERMINAL

J3

TERMINAL

YELLOW

ORANGE

RED

C110nFC2

10nF

C310nF

J4

TERMINAL

J5

TERMINAL

+48V OUT

-48V OUT

J6

TERMINAL GREEN

RED

ORANGE

YELLOW

BROWN

BLUE

1

2

3

1

2

36 V

36 V

0V

115 DEG C

Primary

Secondary

230 V

0 V

GREEN4 38 V

5.5A

5.5A

100 mA

RED

ORANGE

YELLOW

1

2

3

36 V

36 V

0V

Secondary

GREEN4 38 V

5.5A

5.5A

100 mA

MAIN TRANSFORMER

TO POWER AMP SUPPLY RIGHT

VIOLET

BLUE

31

4 2

BR1

BRIDGE BR-254



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

PARTNERSHIP 2005AUDIO



AP17575/2 Rectifier Board PCB Board Layout (Bottom Side)To enhance viewing, please print to A3 46

AP17578/2


CAPACITORS10nF X1 Capacitor MEX103K300A02 Pitch =10mm 3 C14-C16DIODES

Bridge Rectifier BR254 400PIV 25A blk metal case 1 BR1Rectifier is not soldered to PCB until PCB is fixed to amplifier heatsink

MISCELLANEOUS

T6A3 AL6.3 Amp 20mm anti surge Fuse, low breaking capacity

2 F1, F2

2F,1F2mm02redlohesuF100-001050-1304

Cambridge Audio Azur 840A Amplifier, Rectifier PCB BOM


47

Cambridge Audio Azur 840A Amplifier IC Pin LayoutDetails

TC9163AF – Input PCB (U1)

NE5532Input PCB - (U2, U3, U4, U5, U6, U7, U8, U9,U14 & U18)A-BUS PCB – (U1 & U3)Pre-Amp PCB – (U1, U2, U9 & U12)

ULN2003AInput PCB - (U16)Pre-Amp PCB – (U4, U5 & U7)

BC337Input 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)

TSOP18Pre-Amp PCB - (U10)

PIC16F877A-I/SPFront Panel PCB

48

74HC4094Front Panel PCB - (U2, U3, U4, U5 & U6)

BC327Front Panel PCB - (Q1 & Q8)A-BUS PCB – (Q1)

LM393APRight Hand Power Amp PCB - (U1)Left Hand Power Amp PCB – (U1)

MJE340Right Hand Power Amp PCB - (Q1, Q12 &Q18)Left Hand Power Amp PCB – (Q1, Q12, Q18 &Q30)

MJE350Right Hand Power Amp PCB - (Q2)Left Hand Power Amp PCB – (Q2)

MPSA93Right 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)

MPSA43Right 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

2SA1295Right Hand Power Amp PCB - (Q13, Q14 &Q17)Left Hand Power Amp PCB – (Q13, Q14 &Q17)

2SC3264Right Hand Power Amp PCB - (Q15 & Q16)Left Hand Power Amp PCB – (Q15 & Q16)

CD4011BEA-BUS PCB - (U7)

7812A-BUS PCB - (U2)

OP4N25A-BUS PCB - (U8)

PIC16F627-04/PA-BUS PCB - (U5)

TSOP34837A-BUS PCB - (U4)

TSOP34836A-BUS PCB - (U6)

50

AP16396/2 Azur 840A Amplifier Technical Description

Start: 11 Aug 05 Version 2 Updated: 29 Nov 05

Revision historyV1->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 AP16373/3_B

Azur 840A front panel PCB AP16369/3

Azur840A input board PCB AP16361/3

Azur 840A preamp PCB 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

Azur 840A Rectifier PCB AP17575/2

Operating instructions summary

Service Menu

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

NOTESLogic signals are in upper case, thus; MAINS FAILReferences to “the PIC” or “the main PIC” are to the main housekeeping PIC on the front panel PCBunless otherwise stated.

51

The Power Supply PCBThis carries:

Power supplies for everything except power ampsMains on/off and inrush control switching relaysX2 capacitorThe 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 withR78 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 theamplifier goes from ON to standby, RL3 simply opens.

The front panel PCBThis carries:

The main PICThe volume rotary encoder and control switches.The LCD displayShift registers for driving the relaysThe 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. Ithandles all the control functions of the amplifier except for those on the A-BUS hub PCB, which aredealt with by another PIC on that board.

PIC pins handling amplifier conditions:

Pin Normal ActiveSpeaker short-circuit detect 7 LOW HIGH Active= short foundPhones detect 27 HIGH LOW Active= Phone jack inMains fail 28 LOW HIGHDC offset protection 29 HIGH LOWOvertemperature protection 30 HIGH LOWOverload protection 33 HIGH LOWClip detection 34 HIGH LOW

The LCD display module interfaces to the front panel PCB through CN2. Display data from the PIC isclocked serially into shift register U2 and sent to the LCD module in byte-wide parallel format. TheLCD 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 thePIC into 32 latched outputs. Four shift registers (U3,U4,U5,U6) are connected so that the serial inputenters the first register and is clocked through and out of its serial output into the serial input of thesecond register. Changing any output requires 32 bits to be clocked through the registers by the SERIALCLOCK signal. When SERIAL STROBE goes high the data is latched in each register to give a staticoutput. Data appears at the outputs only when the SHIFT REG ENABLE line is high. This line is keptlow at start-up to prevent random data at the outputs, and only goes high when the PIC has initialisedthe 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 fromRS232 levels (nominally +/-9V) to PIC levels (+5V/0V). Q4 handles outgoing RS232 data, level shifting itto give a +15V/0V output.

The main PIC is reprogrammed by holding the standby/ON button in when the mains power is turnedon. The word DOWNLOAD appears on the LCD. A PC running a Windows program is used todownload 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 buffersInput select relaysTape out bufferInput amplifier +6 dBHub input switcherRelay drivers

The input PCB has one stereo input (Input 1) that accepts both balanced and unbalanced signals, and sixmore 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 andvolume 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 mainamplifier input by the CMOS switching IC U1. This is controlled by serial data from the microcontrolleron 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. Theeighth relay is controlled by Q1.

53

The Preamplifier PCBThe preamplifier PCB carries:

The tone controls and DIRECT switchRelay balance controlBalance control buffer AmplifierRelay volume controlVolume control post amplifierRelay driversON/standby LED controlThe IR receiverHeadphone 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 ofthe central position. This is implemented by switching in combinations of three attenuator sections; thefirst is R97,R22,R105, the second R85,R87 and the third R88,R86,R89. These are switched in or out byrelays RL17, RL18 and RL19. When none of these relays are energised the balance network gives thefirst step of attenuation due to R97.When RL15 is energised the balance attenuator network is inserted into the left channel and the stereoimage is shifted to the right. When RL16 is energised the balance attenuator network is inserted into theright channel and the stereo image is shifted to the left.

The balance control attenuation steps are:

Step NominaldB

0 01 -1.32 -2.53 -3.44 -4.55 -5.56 -6.87 -7.78 -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 stepalso 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 isconnected to either the input signal rail or ground by its associated relay. (RL1 to RL14) The resistancesare typically made up two resistors to obtain the exact desired value. This represents a potential dividerthat 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. Thevolume control can be set to ramp up from zero to the stored setting at power-up, and to ramp downon 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) shiftregisters on the front panel PCB. The logic signals come in on CN6, CN8 and CN9, and control the 7-way 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 PSUboard is not being used to power front-panel and preamp PCBs, and thus permits the LED control to work properly in this condition.

Headphone socketThe phones Left and Right signals come in from the two amplifier PCBs. When a jack is inserted in tothe 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 PCBsThe power amplifier boards are very similar. The left channel is described in detail, and the right channeldescription deals only with the differences.

Power Amplifier Left PCBThis description is subdivided as follows:

Input stageDC trim system.The Voltage Amplifier StageBiasing systemOutput stageThe XD Crossover Displacement systemPower suppliesOverload protectionClip detectionDC offset protectionOver-temperature protectionSpeaker short-circuit detectionHeadphone output attenuator

DC trim system.VR2 and its associated components make up the DC trimming network; this allows to output DC offsetto 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 withthe signal, into the output point of a conventional Class-B output stage, with the result that thecrossover point is displaced away from the no-signal voltage. The displacement current is madeproportional 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 zerowith the output fully positive.

55

The XD control circuit is a differential pair of transistors with one input grounded and the other drivenby the main amplifier output voltage, scaled down appropriately by R63, R64. The drive to the displaceris taken from collector load R58, to give the required phase inversion. R59 is present simply to equalisethe 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 currentthrough 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. TheQ18, Q17 structure acts as a unity-gain voltage stage with 100% voltage feedback from Q17 collectorto 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 isdone by Q26. Normally the XD ON/OFF signal coming in on Pin 9 of CN2 is high, (+5V) so Q31 isheld off and Q26 is off. When XD is disabled, XD ON/OFF goes low and Q31 is turned on via R83. Q26is then turned on via R82. The equivalent to Q26 on theright power amp PCB is also turned on by theconnection through Pin 10 of CN1.

Power suppliesThe power supply for the power amplifier consists of three rails. The voltages given here are nominal asthey 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 aswithout it the negative-going voltage-swing of the voltage-amplifier stage is limited, and negative clippingoccurs before positive clipping.

Overload protection.The amplifier is protected against short-term overloads by dual slope VI limiting. The upper half of theoutput 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 theextra current-limiting circuit Q11, R15, R16. When the voltage across R9 becomes excessive, Q11 turnson 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 lowercurrent 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 theOVERLOAD 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 eitheramplifier output occurs. Very brief episodes of clipping are ignored. The volume stays reduced and doesnot ramp back up in the absence of clipping.The clip detect system is based on Q23, Q24 and associated components. Normally both transistors areon, 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 supplyvoltage 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 ofeither 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 protectionPositive thermistor TH1 is mounted on the main amplifier heat-sink. At approx 100degC, its resistancehas 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 amountof 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 detectionWhen the amplifier goes from standby to ON, the speaker outputs are checked for short-circuits beforethe output relays are closed. This system is centred on comparator U1:A but also involves circuitry onthe Right Amplifier PCB.Short-circuits are checked for by passing a small current through the loudspeaker impedances andmonitoring 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 andright, A and B, in parallel so the resulting voltage is not large. It is sent to the left amplifier PCB, wherecomparator U1:A compares it with a reference voltage of 5mV set up by potential divider R85,R87. Ifthe combined loudspeaker resistance is below 1 Ohm, the output of U1:A goes high, signalling a shortcondition to the main PIC.

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

Power Amplifier Right PCBThis description is subdivided as follows:

The right power amplifier The output relays Output relay control systemMains-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 systemThe mains-fail detect system is based on comparator U1:B. It takes the MAINS FAIL IN signal from thePSU board (see above) and compares it with a reference voltage of +310 mV set up by potential dividerR81,R80. When MAINS FAIL IN drops below this threshold, the output goes high. This signal, MAINSFAIL, is sent to the PIC via CN1, pin 9.

A-BUS Hub BoardThis board carries the following functions:

The XLR sockets for the balanced input mode of Input 1Two A-bus outputsHub IR inputHub microcontrollerHub Power supplyIR 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 itto 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 biassupply is derived from the +12V supply rail.

The hub amplifiers have their own ground (ABUS GND) to prevent ground loops, and this use of thedifferential amplifier performs a change of reference so a clean signal reaches the hub amplifier seven ifthe 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 commandsSend input select data to main PICControl Hub input switcher to prevent thumps on 840A outputControl 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; theIR 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 Zenerdiodes D7, D8 reject low-level noise on the incoming IR lines. The combined IR signals are buffered byemitter-follower Q3, and sent out via CN4, CN6 to drive external IR emitters. Incoming modulated IRsignals for input select are also sent to the Hub PIC U5; LED D2 is driven from Q3, and points at IRreceiver U4, the pair being housed in a small light-tight enclosure. The demodulated IR is then appliedto 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.

58

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 theLCD. The active 840A input is denoted by a round marker; the active Hub input is denoted by a circlearound it.

The Hub PIC controls the A-bus status line so that it is high when the 840A is powered and low when itis not. It also implements the “all off” feature; when this command is received from one keypad the HubPIC 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, andhas no connection with the Hub IR system.Modulated IR data (as an electrical signal) enters via 3.5mm jack CN9, and drives LED D1, whichilluminates 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 IRIN signal to the main PIC via CN15. When it reaches the front panel PCB (see above) it is further OR-ed 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 isolatesthe 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-invertthe signal and preserve its phase. It is then OR-ed with the PIC TX signal by U7:B, and buffered byU7:C and U7:D to provide enough drive for the IR output. R50 protects the output and C11,R49 isolatethe IR output ground.IR commands can also be generated by the 840A itself. These come from the main PIC as the signal PICTX 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 combineto give garbled data. This is done by the BLOCK signal from the main PIC, coming in via CN15. Whenthis is high it turns on Q6 and prevents external IR commands from reaching Q5.

The Rectifier PCBThis 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 theincoming AC lines from the transformer.

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Operating Instructions SummaryThis is a very brief guide to enable all the controls and menus of the 840A to be accessed if the fullmanual is not available. (seewww.cambridge-audio.comfor 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 automaticallyreturn to volume mode after 5 seconds.

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To rename inputs:Press and hold the relevant input select button. Letters in the name are selected by turning the volumeknob.

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

Clip detector on/offLCD brightness (off/dim/bright)Input gain trim menu accessVolume ramp on/offVolume 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 Select the input required 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) Press Mode button to return to volume display

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/offXD system on/offCounter accessPress Mode button to return to volume display

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 SH Time on in hours 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 onthe LCD.

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840A Software Loading Instructions

1) Push and hold the “Standby / On” on the front of the 840A whilst turning on the power switch atthe 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 followingwindow will be displayed:

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

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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 ABUSprocessor will be programmed followed bythe Main processor. Once the programming hasfinished, “Programming Completed!” will be displayed and the 840A will reset.

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Gallery Court Hankey Place London SE1 4BB UK Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233

840A________________________________________________________________________________

Notes.

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AP195971 Cambridge Azur 840A Service Manual 2...Cambridge Audio Azur 840A Amplifier Exploded Diagram...

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