Cambridge Audio Azur 840A User manual

Gallery Court Hankey Place London SE1 4BB UK

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

840A

Issue 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

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

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

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

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.

Cambridge Audio Azur 840A Amplifier

840A Block Diagram

To enhance viewing, please print to A3 5

418

Cambridge Audio Azur 840A Amplifier

840A Exploded Diagram

To enhance viewing, please print to A3 6

Cambridge Audio Azur 840A Amplifier

Exploded Diagram Parts List

Drawing

Ref:

AP Part

Number noitpircseD:feRyrotcaF

1 PY1118 2331-004909E301 Speaker Binding Post BP331 (Black) Red & Black

2 PY1019 3200-053044E00

Toroid 230V/50Hz 36.5VACx4 5.5A TI-053044

2 PY1020 3200-053045E00

Toroid 115V/50Hz 36.5VAC 5.5A TI-0853045C for 840A

3 PY1119 3200-074051E001 Toroid 230V/50Hz 7.5VAC750MA 17VAC*2 TO7405B ST

3 PY1120 3200-077811E00

Toroid 115V/50Hz 7.5VAC750MA 17VAC*2 ST

4 PY1121 6074-150003E000-01 840A Bass / Treble Knob (Black) Painted Blac

4 PY1123 6074-150003E001A01 840A Bass / Treble Knob (Silver) Painted Silve

5 PY1122 6074-150004E00

zur 840A Plastic Foot (Black) AP16837

5 PY1124 6074-150004E000A01

zur 840A Plasitc Foot (Silver) AP16837

PY1125 6574-150009E000-01

zur 840A Top Panel Black Painted

PY1126 6574-150009E000-0

zur 840A Top Panel Silve

6 PY112

6574-150013E000-01

zur 840A Side Panel, Black Painted

6 PY1128 6574-150013E000A01

zur 840A Side Panel,Silve

7 PY1129 8584-015010E301

zur 840A Black Front Panel Ass

7 PY1130

zur-840A Silver Front Panel Ass

8 PY1131 6574-150012E000-01

zur 840-A B Front Panel Artwork AP186371/186381 (Metalwork Only

)

8 PY1132

zur 840-A Silver Front Panel Artwork AP186371/186381 (Metalwork Only

)

PY1133 6074-150005E00

zur 840A Volume Knob Plastic Insert (AP1743*)

6574-150015E00

zur 840A Volume Knob Skin, Black

zur 840A Volume Knob Skin, Silver

PY1135 3110-840000E00

LCD Display Highly Transflective DC00003E02 840

PY1136 6600-990112E00

zur 840A Display Backlight (AP16841*)

PY1138 2409-010200E001 Rotary Encoder Switch REBG161(9*7)PVB20FHINB1-2-24

9 PY1139 9484-015000E041

zur-840A AMP-Hub Control PCB Assy Rev

10 PY1159 9484-015000E341

zur-840A Amp Input PCB Assy Rev

11 PY1153 9484-015000E141

zur-840A EU/UK PSU Power Control PCB Assy Rev

12 PY1146 9484-015000E091

zur-840A Main-Amp Left PCB Assy Rev

13 PY1163 9484-015001E091

zur-840A Main-Amp Right PCB Assy Rev

14 PY1155 9484-015000E331

zur-840A Pre-Amp Board Rev

15 PY1145 9484-015000E071

zur-840A Amp-Rectifier PCB Rev

16 PY113

9484-015000E111

zur-840A Amp Front Control PCB Assy Rev

PY1134 9484-015000E061

zur-840A LCD Display Board Assy Rev

18 PY1165 9805-084000E001

zur-840A Remote Control Assy Rev

All spare parts should be ordered from AP Hong Kong office

Cambridge Audio Azur 840A Amplifier

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

MCLR/VPP

RA0/AN0

RA1/AN1

RA2/AN2

RA3/AN3/VREF

RA4/T0CKI

RA5/AN4/SS

RE0/RD/AN5

RE1/WR/AN6

RB4

RB3/PGM

RB2

RB0/INT

VDD

VSS

RD7/PSP7

RD6/PSP6

RB1

RD5/PSP5

RD4/PSP4

RC7/RX/DT

RC5/SDO

RC4/SDI/SDA

RD3/PSP3

RD2/PSP2

RC6/TX/CK

VDD

VSS

OSC1/CLKIN

OSC2/CLKOUT

RCO/T1OSO/T1CKI

RC1/T1OSI/CCP2

RC2/CCP1

RC3/SCK/SCL

RD0/PSP0

RE2/CS/AN7

RD1/PSP1

RB5

RB6/PGC

RB7/PGD

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

C10

100n 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

22R

43R

BC337

LOGIC GND

4K7

100n

100nF

ON/STBY SPEAKER SELECT

LOGIC GND

ROW 3

ROW 2

ROW 1

COL 1 COL 2 COL 3 COL 4

CRYSTAL

FREQ=20MHz

22pF

LOGIC 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

RS232 & IR CABLE TO HUB PCB

IR IN (FROM RECEIVER ON PREAMP BOARD)

C GND

ASW

BSW

FIX2

FIX1

ROT1

NOBLE16ENCODER

POSITION FOR

EXTRA SWITCH

BLUE LED

ON/STBY LED

IR IN (FROM JACK & PHONO ON HUB PCB)

+15V

IR GND

IR IN

RS232 GND

R10

10R

100N CERAMIC

SERIAL RX 232

10U 16V

100R C20

100nF

LOGIC GND

C21

100n

LOGIC GND

BC337

+15V

RS232 TX

R13

22K

R12

2K2

LOGIC GND

SERIAL TX 232

BC337

+5V

1N4002

RS232 RX

R11

10K

22K

LOGIC GND

SERIAL RX 232

RS232 RX

RS232 TX

SERIAL TX 232

PROGRAM_CLOCK

PROGRAM_DATA

PGM

MCLR HUB

R14

10K

+5V

Programming Signals

To ABUS Hub PIC

RS232 TX

RS232 RX

MCLR HUB

PGM

PROGRAM_DATA

PROGRAM_CLOCK

HUB CLOCK

HUB DATA

2K2

OVER TEMP

CN3

FFC 13WAY

BLOCK

PIC TX

SHIFT REG ENABLE

CLK

STB

74HC4094

VDD=+5V

VSS=LOGIC GND

SHIFT REG ENABLE

SERIAL DATA

SERIAL CLOCK

BLOCK

PIC TX

IR CONTROL

PHONES DETECT

OVERLOAD

DC OFFSET

MAINS FAIL

LCD DECOUPLE

100nF

LOGIC GND

+5V

SHIFT REG DECOUPLE

CN1

FFC 12WAY

15 16

CN2

CONN-8 DUAL BOT

LCD DATA SHIFT REGISTER

LCD CONN ORIENTATION FROM FRONT

C15

100pF

C16

100pF

C17

100n

C18

100n

C19

100n

CLIP DETECT

PIC INPUT EMC CAPS

LED BACKLIGHT POWER

1K1

2K2

1K1

SPEAKER TEST

C22

100n

+5V

TRISTATE LED CONTROL

0=BRIGHT

TRISTATE= OFF

1= DIM

R15

10K

LOGIC GND

R16

47R

C23

100N CERAMIC

LOGIC GND

FRONT PANEL GROUNDING

BC337

R17

10K

R18

2K2

C24

10U 16V

BC337

R19

10K

LOGIC GND

FRONT PANEL GND

PAD

BC327-25

CCW

PR1

PRESET 20K 3296W

BC327-25

R23 10R

R24 10R

1N4148

BZX79C2V7 500MW

To enhance viewing, please print to A3 8

Cambridge Audio Azur 840A Amplifier

AP16369/3 Front Panel PCB Schematic (Shift Registers)

CLK

STB

74HC4094

VDD=+5V

VSS=LOGIC GND

LOGIC GND

CLK

STB

74HC4094

VDD=+5V

VSS=LOGIC GND

CLK

STB

74HC4094

VDD=+5V

VSS=LOGIC GND

FROM SHEET 1 SERIAL CLOCK

SERIAL DATA

SERIAL STROBE

SHIFT REG ENABLE

CN4

FFC 08WAY

CN5

FFC 08WAY

CN6

FFC 08WAY

CLK

STB

74HC4094

VDD=+5V

VSS=LOGIC GND

CN7

FFC 08WAY

100nF

+5V

C12

100nF

C13

100nF

C14

100nF

SHIFT REG DECOUPLE

TO PREAMP BOARD

TO INPUT BOARD

To enhance viewing, please print to A3 9

Cambridge Audio Azur 840A Amplifier

AP16369/3 Front Panel PCB Layout (Top Side)

AP16370/3

ROT1

SW1

SW2

SW3

SW4

SW5

SW6

SW7

SW8

SW9

SW10 SW11

C10

C11

C12

C13

C14

C15

C17

R10

R11

R12

R13

R14

R15

C16

C18

C19

Q3 Q4 R5

C20

AP16370/3

C21

C22

U5U6

C24

R17

R18

R19

C23

R16

CN2

R23

R24

D5 D6

To enhance viewing, please print to A3 10

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