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Cambridge Audio Azur 740C Service Manual
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Cambridge Audio Azur 740C Service Manual

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Issue Date: 28
September 2007
________________________________________________________________________
SERVICE MANUAL
________________________________________________________________________
SPECIFICATIONS:
D/A converters
Digital filter
Analog filter
Frequency Response
THD @ 1kHz 0dBFs
THD @ 1kHz -10dBFs
THD @ 20kHz )dBFs
IMD (19/20kHz) 0dBFs
Linearity @ -90dBFs
Total correlated jitter
Crosstalk @ 1kHz
Crosstalk @ 20kHz
Output impedance
Digital input word widths supported
Digital input word widths supported
Digital input sampling frequencies supported
Digital output sampling frequencies supported
Audio output upsampling
Dimensions – H x W x D
Weight
Gallery Court Hankey Place London SE1 4BB UK
Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233
Dual Wolfson
WM8740 24 bit DACs
Analog Devices Black Fin
ADSP-BF532 32 bit DSP
Performing ATF™
Upsampling to 24 bit 384kHz
2 Pole Dual Differential Bessel
Double Virtual Earth Balanced
20Hz to 20 kHz (+/-0.1dB)
< 0.0008%
< 0.0005%
< 0.001%
< 0.0006%
>113dB
<130pS
< -130dB
< -110dB
< 50 ohms
16 – 24 bit
16, 20, 24 bit
32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz,
192kHz
32kHz – 192kHz pass through (including 44.1kHz for CD)
48kHz, 96kHz, 192kHz upsampled
Fixed 24 bit, 384kHz
115 x 430 x 315mm (4.5 x 16.9 x 12.4")
6.4Kg (14.1Lbs)
740C
AP22735/1
1

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Summary of Contents for Cambridge Audio Azur 740C

  • Page 1 740C Issue Date: 28 September 2007 ________________________________________________________________________ SERVICE MANUAL ________________________________________________________________________ SPECIFICATIONS: D/A converters Dual Wolfson WM8740 24 bit DACs Digital filter Analog Devices Black Fin ADSP-BF532 32 bit DSP Performing ATF™ Upsampling to 24 bit 384kHz Analog filter 2 Pole Dual Differential Bessel Double Virtual Earth Balanced Frequency Response 20Hz to 20 kHz (+/-0.1dB)
  • Page 2 740C SERVICE MANUAL TABLE OF CONTENTS Safety Precautions & Important Notes Exploded Diagram Exploded Diagram Parts List Front Panel Circuit Diagram Front Panel Board Layout (Top Side) Front Panel Board Layout (Bottom Side) Front Panel PCB BOM Servo Circuit Diagram Servo Board Layout (Top Side) Servo Board Layout (Bottom Side) Servo Assembly PCB BOM...

  • Page 3: Safety Precautions & Important Notes

    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.
  • Page 9 AP20712/5 Cambridge Azur 740C Front Panel BOM AP Part no. Value Description/Type Factory PN Component Ident NOTES RESISTORS 0.25 W 1% Metal Film 0.25 W 1% Metal Film R3, R4 100R 0.25 W 1% Metal Film R5, R7, R8, R20-R32 220R 0.25 W 1% Metal Film...
  • Page 13 Cambridge Azur 740C Servo PCB Assembly BOM AP20713/2 AP Part No. Value Description/Type Qty Component Ident Factory PN NOTES RESISTORS 0.25 W Metal Film Resistor 1011-000014-000 0.125 W Metal Film Resistor link 14mm link For 840C ONLY. Use link 0.125 W Metal Film Resistor...
  • Page 14 Cambridge Azur 740C Servo PCB Assembly BOM AP20713/2 AP Part No. Value Description/Type Qty Component Ident Factory PN NOTES 10nF Ceramic 50V 5mm Pitch 1100-103043-000 10nF Mylar 5mm Pitch 15nF Ceramic 50V 5mm Pitch 1100-153043-000 C5, 11, 13, 15, 19,...
  • Page 15 Cambridge Azur 740C Servo PCB Assembly BOM AP20713/2 AP Part No. Value Description/Type Qty Component Ident Factory PN NOTES 1N4004 Rectifier Diode D2, 3, 4, 5 1401-140040-000 CRYSTALS PY561 7.3728MHz 2 Pin 5mm Pitch 1600-737282-990 Half size 50ppm as per used on PY027 16.934MHz...
  • Page 17 MULTIPLEXER 1 MULTIPLEXER 2...
  • Page 23 Cambridge Audio 740C DAC PCB Assembly BOM AP20023/8 AP Part No. Value Description/Type ManPN Tolerance PackageInfo Component Ident NOTES RESISTORS 220R Thick film 0.063W 0805 R1, R10 Thick film 1/4W 1206 R2, R89 R3-R5, R21, R23, R26, R27, R37, R39, R41, R56, R68, R69 R86-R88, Thick film 0.063W...
  • Page 24 Cambridge Audio 740C DAC PCB Assembly BOM AP20023/8 AP Part No. Value Description/Type ManPN Tolerance PackageInfo Component Ident NOTES C15,C49,C50,C53- C55,C63,C106,C107,C110,C111,C2 47N 16V ECHU ECHU1C473GX5 1206 C274,C281,C284,C285,C291,C292, C297,C298,C308- C311,C314,C315,C321,C322,C328, C329 100N 50V X7R Ceramic C75-C84, C86-C96 0603 C2,C4,C7,C9,C12,C14,C19- C21,C23,C24,C27- C29,C32,C33,C43,C45,C47,C51,C5...
  • Page 25 Cambridge Audio 740C DAC PCB Assembly BOM AP20023/8 AP Part No. Value Description/Type ManPN Tolerance PackageInfo Component Ident NOTES Quad OR Gates 74VHC32 SO14 OPTICAL PY363 APTX179AT APTX179AT TRANSMITTER PY980 SPDIF RX IC CS8416CZ TSSOP28 PY979 SPDIF TXCIC CS8406CZ TSSOP28...
  • Page 29 AP20027/2 Cambridge Azur 740C Mains PCB BOM Component AP Part No. Value Description/Type Factory PN NOTES Ident CAPACITORS 1N X1/Y1 10mm pitch POLYESTER CAPACITOR C1, 2 47N X2 15mm pitch POLYESTER CAPACITOR 15MM PITCH CONNECTORS IEC-SOCKET 3 WAY IEC CONNECTOR...
  • Page 30 Cambridge Audio Azur 740C CD Player – IC Pin Layout Details TA2153FN Servo PCB – (U1) TC9462FG Servo PCB – (U2)
  • Page 31 MCU TMP87EP26F-1J15 Servo PCB - (U3) TA2092N Servo PCB – (U6) 7808 Servo PCB – (U7) 7805 Servo PCB - (U8) DAC PCB – (U17, U25, U27, U29, U31 & U36) C8050D Servo PCB - (Q7, Q8, Q11 & Q12)
  • Page 32 9014C Servo PCB - (Q13) C8550 Servo PCB - (Q9 & Q10) 9015C Servo PCB (Q1) TSOP1836SS3V Front Panel PCB -(U1) PIC16F877A-I/P Front Panel PCB - (U2)
  • Page 33 DS18030-050 Front Panel PCB - (U3) PIC12C508A - I/P Front Panel PCB - (U4) BA6218 Front Panel PCB - (U5) BC337 Front Panel PCB - (Q1, Q2, Q3 & Q4) TSOP1836 DAC PCB - (U1) OP4N25 DAC PCB - (U2)
  • Page 34 4011 DAC PCB - (U3) APRX179AT DAC PCB - (U4 & U5) 74VHC14 DAC PCB - (U6 & U15) 74VHC153 DAC PCB - (U7) 74HCT153 DAC PCB - (U9)
  • Page 35 74VHC32 DAC PCB - (U8) APTX179AT DAC PCB - (U10) CS8416CZ DAC PCB - (U11) CS8406CZ DAC PCB - (U12) ADSP-BF532BSTZ400 DAC PCB - (U13)
  • Page 36 7815 DAC PCB - (U14, U22, U49 & U51) 7915 DAC PCB - (U16 & U24) LM1117T-3.3 DAC PCB - (U18 & U26)
  • Page 37 74VHC125 DAC PCB - (U19) 74HCT125 DAC PCB - (U20) DS1818 DAC PCB - (U21) 74HCU04 DAC PCB - (U23) LT1963AET DAC PCB - (U30) AT49BV002AN70TU DAC PCB - (U32)
  • Page 38 NE5532AD DAC PCB - (U55, U56, U59 & U60) OP275GS DAC PCB - (U57 & U61) WM8740 DAC PCB - (U54 & U58) BC807-25 DAC PCB - (Q2 & Q8) MPSA14 DAC PCB - (Q4 & Q6) TIP31 DAC PCB - (Q10 & Q11) BC817-25 DAC PCB - (Q1, Q12, Q13, Q17 &...