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

  • View
    2

  • Download
    2

Embed Size (px)

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

  • 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

    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 Diagram To enhance viewing, please print to A3 5

  • 7

    10 6

    2

    3

    9

    17

    4 18

    15

    8

    13

    5

    11

    16

    6

    115

    14

    12

    5

    Cambridge Audio Azur 840A Amplifier

    840A Exploded Diagram To enhance viewing, please print to A3 6

  • C a m

    b ri

    d g e A

    u d

    io A

    z u

    r 8 4 0 A

    A m

    p li fi e r

    E x p

    lo d

    e d

    D ia

    g ra

    m P

    a rt

    s L is

    t

    D ra

    w in

    g

    R e f:

    A P

    P a rt

    N u

    m b

    e r

    n oit

    pircs e

    D :f

    e R

    yr otc

    a F

    1 P

    Y 1

    1 1

    8 2

    3 3

    1 -0

    0 4

    9 0

    9 E

    3 0

    1 Sp

    e ak

    e r

    B in

    d in

    g P

    o st

    B P

    3 3

    1 (

    B la

    ck )

    R e d

    & B

    la ck

    2 P

    Y 1

    0 1

    9 3

    2 0

    0 -0

    5 3

    0 4

    4 E

    0 0 0

    T o

    ro id

    2 3

    0 V

    /5 0

    H z

    3 6

    .5 V

    A C

    x 4

    5 .5

    A T

    I- 0

    5 3

    0 4

    4 C

    2 P

    Y 1

    0 2

    0 3

    2 0

    0 -0

    5 3

    0 4

    5 E

    0 0 0

    T o

    ro id

    1 1

    5 V

    /5 0

    H z

    3 6

    .5 V

    A C

    5 .5

    A T

    I- 0

    8 5

    3 0

    4 5

    C f

    o r

    8 4

    0 A

    3 P

    Y 1

    1 1

    9 3

    2 0

    0 -0

    7 4

    0 5

    1 E

    0 0

    1 T

    o ro

    id 2

    3 0

    V /5

    0 H

    z 7

    .5 V

    A C

    7 5

    0 M

    A 1

    7 V

    A C

    *2 T

    O 7

    4 0

    5 B

    S T

    B

    3 P

    Y 1

    1 2

    0 3

    2 0

    0 -0

    7 7

    8 1

    1 E

    0 0 0

    T o

    ro id

    1 1

    5 V

    /5 0

    H z

    7 .5

    V A

    C 7

    5 0

    M A

    1 7

    V A

    C *2

    S T

    B

    4 P

    Y 1

    1 2

    1 6

    0 7

    4 -1

    5 0

    0 0

    3 E

    0 0

    0 -0

    1 8

    4 0

    A B

    as s

    / T

    re b

    le K

    n o

    b (

    B la

    ck )

    P ai

    n te

    d B

    la ck

    4 P

    Y 1

    1 2

    3 6

    0 7

    4 -1

    5 0

    0 0

    3 E

    0 0

    1 A

    0 1

    8 4

    0 A

    B as

    s /

    T re

    b le

    K n o

    b (

    Si lv

    e r)

    P ai

    n te

    d S

    ilv e r

    5 P

    Y 1

    1 2

    2 6

    0 7

    4 -1

    5 0

    0 0

    4 E

    0 0 0

    A zu

    r 8

    4 0

    A P

    la st

    ic F

    o o

    t (B

    la ck

    ) A

    P 1

    6 8

    3 7 *

    5 P

    Y 1

    1 2

    4 6

    0 7

    4 -1

    5 0

    0 0

    4 E

    0 0

    0 A

    0 1

    A zu

    r 8

    4 0

    A P

    la si

    tc F

    o o

    t (S

    ilv e r)

    A P

    1 6

    8 3

    7 *

    P Y

    1 1

    2 5

    6 5

    7 4

    -1 5