Cambridge Audio 840A v2 Manual
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Issue Date: January 2008
SERVICE MANUAL

Specifications

Power Output:
Input Impedance:
THD (unweighted):
Frequency Response:
Signal to Noise Ratio:
Power amp damping factor:
Max. Power Consumption:
Min. Power Consumption:
Bass:
Treble:
Dimensions (H x W x D):
Weight:
Audio Partnership, Gallery Court, Hankey Place, London, SE1 4BB, UK
Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233
840A v2
120W RMS into 8 Ohms
200W RMS into 4 Ohms
Input 1 (balanced) 20 kOhm
Inputs 2-7 20 kOhm
Tape Input 20 kOhm
< 0.001% 1 kHz at 80% of rated power
< 0.01% 20 Hz - 20 kHz at 80% of rated power
10 Hz - 50 kHz +/- 1 dB
> 93 dB
> 110 at 1 kHz
800W
Active (no signal) 70W
Standby 7W
Max bass boost/cut +/- 10 dB at 10 Hz
Max treble boost/cut +/- 7.5 dB at 20 kHz
115 x 430 x 385mm
(4.5 x 16.9 x 15.2")
15.0kg (33Lbs)
AP23462/1

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Summary of Contents for Cambridge Audio 840A v2

  • Page 1: Specifications

    840A v2 Issue Date: January 2008 SERVICE MANUAL Specifications Power Output: 120W RMS into 8 Ohms 200W RMS into 4 Ohms Input Impedance: Input 1 (balanced) 20 kOhm Inputs 2-7 20 kOhm Tape Input 20 kOhm THD (unweighted): < 0.001% 1 kHz at 80% of rated power <...
  • Page 2: Table Of Contents

    CAMBRIDGE AUDIO AZUR 840A v2 AMPLIFIER SERVICE MANUAL TABLE OF CONTENTS Specifications Table of Contents Front Panel Control Details Rear Panel Connection Details Remote Control Details Safety Precautions & Important Notes Exploded Diagram Exploded Diagram Parts List Main Input Circuit Diagram Mains Circuit Board Bill of Material PSU Circuit Board –...
  • Page 3: Table Of Contents

    CAMBRIDGE AUDIO AZUR 840A v2 AMPLIFIER SERVICE MANUAL TABLE OF CONTENTS Cont. Pre Amp Circuit Board Bill of Material Cont. Left Power Amp Circuit Board – Power Supply Left Power Amp Circuit Board – Circuit Left Power Amp Circuit Board – Protection Circuitry...
  • Page 4: Front Panel Control Details

    Standby mode when not in use. Bass and Treble Note: As default the 840A V2 ramps the volume up or down when Press to release and rotate to allow subtle adjustments to the tonal switched on and when going into Standby mode. This feature can be balance of the sound.
  • Page 5: Rear Panel Connection Details

    Commands received here are not looped out of the Control Bus. Refer to the ‘Custom installation’ section for more The Tape Input circuit of the 840A V2 is a "monitor" type, different from information. the other 7 inputs. For the 7 normal inputs, the source selected for listening to will be sent out of the Tape Out for recording.
  • Page 6: Remote Control Details

    The 840A V2 is supplied with an Azur Navigator remote control that The 840A V2 remote can also control the basic functions of Apple iPod’s when mounted in Cambridge Audio’s iPod docks, Apple’s Universal Dock operates both this amplifier and Cambridge Audio Azur CD players.
  • Page 7: 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 11: Mains Circuit Board Bill Of Material

    Cambridge Audio Azur 840A v2 Mains PCB Assembly BOM - (AP20775/1) Value Description Component ID Factory P/N Tolerance AP P/N CAPACITORS 10nF 300V X1 Mains Rated C1, C2 470nF 275V Met Polypropylene X2 CMKS474M275Rxxxx CONNECTORS 3 Pin IEC Socket SS-7B-1...
  • Page 13: Psu Circuit Board Bill Of Material

    Cambridge Audio Azur 840A v2 PSU PCB Assembly BOM - (AP20785/1) Value Description Component ID Factory P/N Tolerance AP P/N RESISTORS 2.2R 1/2W Carbon 10W WireWound 1/8W Metal Film 1/8W Metal Film CAPACITORS 10nF 250V X1/Y1 Mains Rated C9, C10 47nF 63V Met.
  • Page 16: Front Panel Circuit Board Bill Of Material

    Cambridge Audio Azur 840A v2 Front Panel PCB Assembly BOM - (AP20780/1) Value Description Component ID Factory P/N Tolerance AP P/N RESISTORS no fit 1/4W Metal Film R23, R24, R109 1/4W Metal Film R18, R29-R31 1/4W Metal Film R102, R103...
  • Page 23: Input Circuit Board Bill Of Material

    Cambridge Audio Azur 840A v2 Input PCB Assembly BOM - (AP20755/1) Value Description Component ID Factory P/N Tolerance AP P/N RESISTORS 1/8W Metal Film R55, R56, R65, R74, R80, R82 100R 1/8W Metal Film R14, R22, R85 220R 1/8W Metal Film...
  • Page 31: Pre Amp Circuit Board Bill Of Material

    Cambridge Audio Azur 840A v2 Preamp PCB Assembly BOM - (AP20760/1) Value Description Component ID Factory P/N Tolerance AP P/N RESISTORS 1/4W Metal Film R81, R82, R105, R106 1/4W Metal Film R20, R21 1/2W Carbon R114, R115 1/8W Metal Film...
  • Page 32 Cambridge Audio Azur 840A v2 Preamp PCB Assembly BOM - (AP20760/1) Value Description Component ID Factory P/N Tolerance AP P/N CONNECTORS Stereo 6.35mm Headphone Jack CK-6.35-04A 12 Way FFC Connector D100-SSV-12 6 Way Straight Header CN3, CN13 B6B-PH-KS 2 Way...
  • Page 37 Cambridge Audio Azur 840A v2 Left Power Amp - (AP20765/3) Value Description Component ID Factory P/N Tolerance AP P/N RESISTORS 0.1R 3W WireWound R21, R22 1.5R 3W WireWound 4.7R 2W Carbon 2W Carbon Film 1/8W Metal Film R12, R17, R50...
  • Page 38 Cambridge Audio Azur 840A v2 Left Power Amp - (AP20765/3) Value Description/Type Component ID Factory P/N Tolerance AP P/N CAPACITORS no fit No Fit C26, C27 10pF 50V NP0 Ceramic 1nF 63V Polypropylene 1nF 50V Ceramic 2.2nF 63V Polypropylene 10nF 63V...
  • Page 43 Cambridge Audio Azur 840A v2 Right Power Amp - (AP20770/3) Value Description/Type Component ID Factory P/N Tolerance AP P/N RESISTORS 0.1R 3W WireWound R21, R22 1.5R 3W WireWound 4.7R 2W Carbon 2W Carbon Film 1/8W Metal Film R12, R17, R50...
  • Page 44 Cambridge Audio Azur 840A v2 Right Power Amp - (AP20770/3) Value Description/Type Component ID Factory P/N Tolerance AP P/N CAPACITORS no fit No Fit C26, C27 10pF 50V NP0 Ceramic 1nF 63V Polypropylene 1nF 50V Ceramic 2.2nF 63V Polypropylene 10nF 63V...
  • Page 49 Cambridge Audio Azur 840A v2 Speaker PCB Assembly BOM - (AP20799/1) Value Description Component ID Factory P/N Tolerance AP P/N RESISTORS 1206 Thick Film R10, R16 1206 Thick Film R13, R14 100R 1206 Thick Film R6, R9 1206 Thick Film...
  • Page 52 Cambridge Audio Azur 840A v2 ABUS Hub PCB - (AP20790/1) Value Description/Type Component ID Factory P/N Tolerance AP P/N RESISTORS 2.2R 1/4W Metal Film 1/8W Metal Film R1, R2, R15, R16, R19, R34 100R 1/4W Fusible 100R 1/8W Metal Film...
  • Page 53 Cambridge Audio Azur 840A v2 ABUS Hub PCB - (AP20790/1) Value Description/Type Component ID Factory P/N Tolerance AP P/N DIODES Red LED D1, D2 MV50640 PY962 400V 1A Rectifier 1N4004 75V 150mA Signal Diode D5, D6 1N4148 2.7V 500mW Zener...
  • Page 54 Cambridge Audio Azur 840A v2 Amplifier IC Pin Layout Details TC9163AF NE5532 ULN2003A BC327 LM393AP 2SA1295...
  • Page 55 2SC3264 CD4011BE 7812 OP4N25 TSOP34837 TSOP34836 24FJ64JA008...

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