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Cambridge Audio Azur 840W Service Manual
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Cambridge Audio Azur 840W Service Manual

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See also: Code List , User Manual
Issue Date: November 2008
SERVICE MANUAL – AP23914/1
Specifications:
Power Output – Stereo / Mono
Power Output – Bridged Mono
THD (unweighted)
Frequency Response
S/N ration (ref 1W/8 Ohm)
Sensitivity
Input Impedances
Damping factor
Trigger In
Trigger Out
Power consumption
Dimensions (H x W x D)
Weight
Audio Partnership, Gallery Court, Hankey Place, London, SE1 4BB, UK
840W Power Amp.
Tel: +44 (0)20 7940 2200
Fax: +44 0 20 7940 2233
200W per channel 8 Ohms
350W per channel 4 Ohms
500W 8 Ohms
800W 4 Ohms
< 0.001% 1kHz
< 0.005% 20Hz – 20kHz
5Hz – 80kHz – 1dB
> 90 dB (unweighted)
Stereo or Mono =
(for 200W 8 Ohms) 1.5V rms unbalanced
1.5 + 1.5V rms balanced
Bridged Mono =
0.775V rms unbalanced
0.775V + 0.775V rms balanced
Balanced input 38 kOhm
Unbalanced input 68 kOhm
> 125 at 1 kHz
5 – 12V AC or DC
12V DC @ 100mA
Maximum 2400W
Active (no signal) < 180W
Standby < 5W
148 x 430 x 365mm
(5.8 x 16.9 x 14.4")
19.6kg (33lbs)
1

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Summary of Contents for Cambridge Audio Azur 840W

  • Page 1 840W Power Amp. Issue Date: November 2008 SERVICE MANUAL – AP23914/1 Specifications: Power Output – Stereo / Mono 200W per channel 8 Ohms 350W per channel 4 Ohms Power Output – Bridged Mono 500W 8 Ohms 800W 4 Ohms THD (unweighted) <...

  • Page 2: Table Of Contents

    CAMBRIDGE AUDIO AZUR 840W POWER AMP SERVICE MANUAL TABLE OF CONTENTS Specifications Table of Contents 2 - 3 Front Panel Details Rear Panel Connections Safety Instructions Service Adjustment Procedure_______________________________________________7 Exploded Drawing Exploded Drawing Parts List Power PCB Schematic Power PCB Schematic (Revision 1)___________________________________________ 11...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS Cont Input PCB Board Bill of Materials 26 - 27 Power Amp Schematic Power Amp Power Supplies Schematic Power Amp PCB Layout Power Amp Module Bill of Materials 31 - 32 Control Bus PCB Layout Control Bus PCB Schematic Control Bus Bill of Materials Control Bus Bill of Materials (Updated Revision)_________________________________ 36 Mode Switch PCB Schematic...
  • Page 4 Cambridge Audio Azur 840W Power Amplifier Front panel controls azur 840W Class XD Power Amplifier Left Right Standby / On Output Protection Clipping Bridged Mono Output Protection Clipping Standby/On LED indicators Switches the unit between Standby mode (indicated by dim power LED) Stereo output: and On (indicated by bright power LED).

  • Page 5: Rear Panel Connections

    Cambridge Audio Azur 840W Power Amplifier Loudspeaker Terminals - Right Loudspeaker Terminals - Left IMPORTANT! Impedance 4 - 8 ohms Impedance 4 - 8 ohms Only change modes Designed in London, England when unit is off. Please ensure that loudspeaker terminals are fully tightened Please ensure that loudspeaker terminals are fully tightened Veuillez s'assurer que les bornes de l'enceinte sont entièrement serrées...

  • Page 6: Safety Instructions

    Cambridge Audio Azur 840W Power Amplifier Important safety instructions For your own safety please read the following important safety CAUTION AVIS ACHTUNG instructions carefully before attempting to connect this unit to the mains power supply. They will also enable you to get the best performance and...

  • Page 7: Service Adjustment Procedure

    Service Adjustment Procedure      The  Bias  should  be  14mV  when  the  840W  is  up  to  temperature,  this  is  measured  across  each  emitter  resistor  individually  (R21/R22),  as  there  is  a  single  adjustment  for  both  get  as  close  as  possible.   Because  of  the  very  large  mass  of  metal  in  the  main ...

  • Page 9: Exploded Drawing Parts List

    Cambridge Audio Azur 840W Power Amp D raw ing ref A P part num ber F actory code D escription P Y 1228 7003-008010E 002 S crew M 3*8 M /C 1/K T O R X R E C E S S Z IN C -P T...
  • Page 10 Cambridge Audio Azur 840W Power Amplifier MICROCONTROLLER SUPPLY L7805 T1AL 1N4004 Regulator 1N4004 4700uF 25V Slow Blow Fuse Rectifier 100nF 50V Rectifier 1N4004 Electrolytic 1/4W Metal Film Mono Ceramic Rectifier MAINS FAIL 1/4W Metal Film LO = NORMAL TERMINAL 100nF 50V...
  • Page 11 Cambridge Audio Azur 840W Power Amplifier MICROCONTROLLER SUPPLY 100nF 50V 1206 Ceramic L7805 T1AL 10nF 50V Regulator 4700uF 25V Slow Blow Fuse 1206 Thick Film X7R Ceramic Electrolytic 0805 MAINS FAIL 1206 Thick Film LO = NORMAL 100nF 50V TERMINAL...

  • Page 12: Power Pcb Layout (Revision 1)

    Cambridge Audio Azur 840W Power Amp Power PCB Layout...
  • Page 13 Cambridge Audio Azur 840W Power Amplifier C 18 C 27 D 10 D 12 D 11 D 17 C 26 C 25 C 17 F B1 R 10 C 11 D 13 C 24 C 14 C 12 R 13...
  • Page 14 Cambridge Audio Azur 840W Power PCB (AP20549/4) RESISTORS c t i c t i c t i c t i c t i c t i c t i c t i CAPACITORS c t i c t i c i t...
  • Page 15 Cambridge Audio Azur 840W Power PCB BOM- (AP20549/5) Value Description/Type Component Ident ManPN Tolerance PackageInfo Factory P/N NOTES RESISTORS c t i CAPACITORS 39nF 250V Met. Polyester C1-C7, C27 CMEA393K250Rxxxx 5mm Pitch Box c t i 100nF 250V Met Polyester...
  • Page 16 Cambridge Audio Azur 840W Power Amplifier RL1:A RL2:A 10nF 300V X1 Mains Rated 1N4002 MAINS ON/OFF RELAY ! Safety Critical Rectifier 1N4002 Rectifier ME19-009HS2 ME19-009HS2 10W WireWound 1P NO Relay 1P NO Relay RL2:B MAINS INRUSH RELAY ME19-009HS2 Fuseholder 20mm/32mm...
  • Page 17 Cambridge Audio Azur 840W Power Amplifier RL1:A RL2:A 10nF 300V X1 Mains Rated MAINS ON/OFF RELAY ! Safety Critical ME19-009HS2 ME19-009HS2 10W WireWound 1P NO Relay 1P NO Relay RL2:B MAINS INRUSH RELAY ME19-009HS2 Fuseholder 20mm/32mm 10W WireWound 1P NO Relay...
  • Page 18 Cambridge Audio Azur 840W Power Amplifier +15V 470pF 50V NP0 Ceramic TERRAPIN MODULE RIGHT INPUT BALANCED INPUT AMP +15V CHASSIS GND 1/8W Metal Film CN17 100nF 100V 750R Polypropylene U12:B C102 100nF 100V BAL/UNBAL INPUT SWITCH C101 5033T Polypropylene U14:A...
  • Page 19 Cambridge Audio Azur 840W Power Amplifier 470pF 50V NP0 0805 BALANCED INPUT AMP +15V RIGHT INPUT 100nF 100V Polypropylene +15V 0204 Melf C101 750R 0204 Melf CN17 U12:B 100nF 100V BAL/UNBAL INPUT SWITCH C100 5033T Polypropylene U14:A Female XLR with Latch...
  • Page 20 Cambridge Audio Azur 840W Power Amplifier NOTE: COMPARATOR IS A-VERSION (LOW OFFSET) COMPARATOR DECOUPLE 3.6V 250mW TRIGGER INPUT Zener SM R103 10uF 16V 100K 1206 Thick Film 1/4W Metal Film Electrolytic 1/4W Metal Film CN11 47nF 63V 100nF 50V U1:A...
  • Page 21 Cambridge Audio Azur 840W Power Amplifier 3.6V 250mW TRIGGER INPUT Zener SM R103 1206 Thick Film 100nF 50V +15V 1206 Ceramic 0805 Thick Film Trigger INPUT HCPL-050L 0805 Thick Film 47nF 63V BC846 Met. Polyester +15V NPN Small Signal 100K...
  • Page 22 Cambridge Audio Azur 840W Power Amplifier +15V 470pF 50V NP0 Ceramic TERRAPIN MODULE LEFT INPUT 750R BALANCED INPUT AMP +15V 1/8W Metal Film CHASSIS GND 1/8W Metal Film 100nF 100V Polypropylene U4:B 100nF 100V 5033T U3:A Polypropylene BAL/UNBAL INPUT SWITCH...
  • Page 23 Cambridge Audio Azur 840W Power Amplifier +15V 470pF 50V NP0 0805 BALANCED INPUT AMP LEFT INPUT 100nF 100V Polypropylene +15V 0204 Melf 100nF 100V 750R Polypropylene 0204 Melf U4:B 5033T BAL/UNBAL INPUT SWITCH U3:A Female XLR with Latch 1/8W Metal Film Unity gain 1.57 Vrms in for max output...

  • Page 24: Input Pcb Layout

    Cambridge Audio Azur 840W Power Amp Input PCB Layout...
  • Page 25 Cambridge Audio Azur 840W Power Amplifier S W 1 S W 2 C N15 U 10 R 51 C 28 R 94 R 49 R 48 C 105 C 104 R 29 C 43 C 48 C 31 C 32...
  • Page 26 Cambridge Audio Azur 840W Input PCB (AP20561/8) Value Description/Type Component Ident ManPN Tolerance PackageInfo NOTES RESISTORS R10, R12, R16, R18, R68, 1/8W Metal Film 7.5mm Pitch R70, R74, R76 1206 Thick Film 1206 0805 Thick Film 1206 Thick Film 1206...
  • Page 27 Cambridge Audio Azur 840W Input PCB (AP20561/8) 100nF 50V 1206 Ceramic 1206 C26, C28, C32, C56, C62, 100nF 50V 0805 Ceramic C102, C103 100nF 50V 1206 Ceramic C27, C30, C31 1206 470nF Mains Rated X2 27.5mm Pitch Box Safety critical...
  • Page 28 Cambridge Audio Azur 840W Power Amplifier +63V 6 mA 8.8 mA 220uF 80V 1N4148 Electrolytic 47uF 50V Signal Diode 47nF 100V 100R Electrolytic 1/8W Metal Film Met. Polyester 47uF 16V 1/4W Metal Film 1/4W Metal Film Electrolytic 1N4148 MJE340 1206 Thick Film...
  • Page 29 Cambridge Audio Azur 840W Power Amplifier MAIN TRANSFORMER BRIDGE RECTIFIER RESERVOIR CAPACITORS T10AL Slow Blow Fuse 45 Vrms 45V IN +63V 5.5A GREY 10000U 80V 10000U 80V 10nF 300V Electrolytic Electrolytic BLUE VIOLET ORANGE X1 Mains Rated 0V IN ORANGE...
  • Page 30 Cambridge Audio Azur 840W Power Amp Power Amp PCB Layout...
  • Page 31 Cambridge Audio Azur 840W Power Amp Module (AP20553/9) Value Description/Type Component Ident ManPN Tolerance Factory P/N NOTES RESISTORS No Fit Space body 3mm from PCB. Do not sleeve 0R68 3W WireWound 1074-707330E000 legs. R19, R20, R25, R26, R69- 3W WireWound...
  • Page 32 1000uF 80V Electrolytic C11, C17 CONNECTORS 2 Way Straight Header B2B-XH-A 2300-002100-003 3 Way Straight Header CN2, CN7 B3B-XH-A 2300-003100-004 6 Way 90 Deg Pin Header 201R-1X6P 2370-006110E000 10 Way 90 Deg Pin Header 201R-1X10P 2370-010110E000 10 Way FFC Connector D100-SSV-10 2301-010501E001 DIODES...
  • Page 33 Cambridge Audio Azur 840W Power Amplifier +12V TRIGGER IN CKX-3.5-12 TO INPUT PCB 3.5mm Jack MECHANICAL PARTS +12V TRIGGER OUT BRK1 CKX-3.5-12 3.5mm Jack 10 Way FFC Connector IR EMITTER IN M3x5mm MC CKX-3.5-12 3.5mm Jack ALTO right-angle bracket CHASSIS GND...
  • Page 34 Cambridge Audio Azur 840W Power Amp Control Bus PCB Schematic...
  • Page 35 Cambridge Audio Azur 840W Control Bus PCB (AP20565/3) Value Description/Type Component Ident ManPN Tolerance PackageInfo Factory P/N NOTES RESISTORS 1/4W Metal Film 10mm Pitch CAPACITORS 100pF 500V Y5P Ceramic 5mm Pitch 1nF 50V Ceramic 2.5mm Pitch 1100-102043-000 10nF 50V Ceramic 2.5mm Pitch...
  • Page 36 Cambridge Audio Azur 840W Control Bus PCB BOM - (AP20565/4) Value Description/Type Component Ident Manufacturer ManPN Tolerance PackageInfo Yanion P/N NOTES RESISTORS 1/4W Metal Film 10mm Pitch CAPACITORS 100pF 50V NP0 Ceramic 5mm Pitch 1nF 50V Ceramic 2.5mm Pitch 1100-102043-000...
  • Page 37 Cambridge Audio Azur 840W Power Amplifier TO INPUT PCB MECHANICAL PARTS LEFT NORMAL LEFT INVERTED MONO/BRIDGE BRIDGE MONO SWITCH LOGIC GND STEREO MONO BRK1 BRK2 BRIDGING SWITCH LOGIC GND RIGHT NORMAL TO RIGHT POWER AMP 8 Way FFC Connector 2P2T...
  • Page 38 Cambridge Audio Azur 840W Power Amp Mode Switch PCB Layout...
  • Page 39 Cambridge Audio Azur 840W Power Amplifier Mode Switch PCB Layout (Revision 1)
  • Page 40 Cambridge Audio Azur 840W Mode Switch PCB (AP20569/3) Value Description/Type Component Ident ManPN Tolerance PackageInfo Factory P/N NOTES CONNECTORS 8 Way FFC Connector D100-SSV-08 Standard 2301-008501E001 SWITCHES 2P2T Slide Switch SW1, SW2 SS004-P022BY-PF8 PCB Mount 2403-020200E014 PY1477 Note: resistors, capacitors and other 'generic' components are...
  • Page 41 Cambridge Audio Azur 840W Mode Switch PCB BOM - (AP20569/4) Value Description/Type Component Ident Manufacturer ManPN Tolerance PackageInfo Yanion P/N NOTES CONNECTORS 8 Way Straight Header B8B-PH-KS 2mm Pitch 2300-008000-000 SWITCHES 2P2T Slide Switch SW1, SW2 Well Long SS004-P022BY-PF8 PCB Mount...
  • Page 42 Cambridge Audio Azur 840W Power Amplifier CABLE COLOURS BROWN Blue Azur LED 1102-1M BLUE ON/STBY SWITCH ORANGE Yanion SWITCH © COPYRIGHT The Audio Partnership Gallery Court Hankey Place LONDON SE1 4BB Tel : +44 (0)171 940 2200 Fax : +44 (0)171 940 2233...
  • Page 43 Cambridge Audio Azur 840W Power Amp On Standby Switch PCB Layout...
  • Page 44 Cambridge Audio Azur 840W On Standby Switch PCB (AP20573/4) Value Description/Type Component Ident ManPN Tolerance PackageInfo NOTES DIODES Blue Azur LED HFB963M-130 Leads must have no ears 4mm spacing LED base to PCB SWITCHES Tactile 1102-1M Through Hole 4.3mm Height Tact Switch...