Table of Contents
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Issue Date: 31
st
March 2006
_________________________________________________________________________________________
SERVICE MANUAL
_________________________________________________________________________________________
SPECIFICATIONS:
Power Output
THD (unweighted)
Frequency response (-1dB)
S/N ratio (ref 1w)
Input impedances
Power Amp damping factor
Max power consumption
Min/On power consumption
Standby power consumption
Bass / Treble controls
Dimensions
Weight
60W (into 8Ω)
90W (into 4Ω)
<0.002% @ 1kHz, of rated power
<0.070% 20Hz – 20kHz, of rated power
<0.025% 20Hz – 20kHz @ 10w
5Hz – 50kHz
>85dB
47kohms
>100
650w
<35w (no signal)
<10w
Shelving, ultimate boost/cut + /-7.5dB
@ 20Hz and 20kHz
100 x 430 x 310mm
(3.9 x 16.9 x 12.2")
7.4kg (16.3Lbs)
Gallery Court Hankey Place London SE1 4BB UK
Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233
540A V2
AP19973/1
1
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Summary of Contents for Cambridge Audio Azur 540A V2.0
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Page 1: Specifications
540A V2 Issue Date: 31 March 2006 _________________________________________________________________________________________ SERVICE MANUAL _________________________________________________________________________________________ SPECIFICATIONS: Power Output 60W (into 8Ω) 90W (into 4Ω) THD (unweighted) <0.002% @ 1kHz, of rated power <0.070% 20Hz – 20kHz, of rated power <0.025% 20Hz – 20kHz @ 10w Frequency response (-1dB) 5Hz –... -
Page 2: Table Of Contents
540A V2.0 SERVICE MANUAL TABLE OF CONTENTS Safety Precautions & Important Notes Exploded Diagram Input PCB Schematic (Power Supply) Input PCB Schematic (Buffers and Switches) Input PCB Schematic (Tone Control) Input PCB Schematic (Protection Circuitry) Input PCB Schematic (Headphone Driver) Input PCB Layout (Top Side) Input PCB Layout (Bottom Side) Input PCB Assembly BOM... -
Page 3: Safety Precautions & Important Notes
COPYRIGHT NOTICE. © 2005 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 4: Exploded Diagram
PY945 6040-150002-000-01 BATTERY-DOOR FOR Azur R/C BLACK PAINTED 19 (b) PY1056 6550-150021E001A03 AZUR 540A V2.0 FRONT PANEL-Silver (Metal only) PY1054 6550-150021E001-03 AZUR 540A V2.0 FRONT PANEL-Black (Metal only) PY515 7002-608010-001 Screw M2.6 x 8 M/C Torx Recessed 1/K Head Black... -
Page 5: Input Pcb Schematic (Power Supply)
Cambridge Audio Azur 540A V2.0 Amplifier R114 R114 PIC Standby Relay LK105 LK10MM PIC Standby Relay LK105 Standby Relay 1N4148 LK10MM Standby Relay BC327 BC327 1N4004 1U 25V LK106 1U 25V LK10MM LK106 LK10MM L7805 Main Revision 1 47u 16V... -
Page 6: Input Pcb Schematic (Buffers And Switches)
Cambridge Audio Azur 540A V2.0 Amplifier U10:A NE5532N U10:B +15V R113 CN16:B CN15:D CN15:B CN12:D CN12:B CN13:D CN13:B CN14:D CN14:B AV2-8,4-9 AV4-8,4-9 AV4-8,4-9 AV4-8,4-9 AV4-8,4-9 AV4-8,4-9 AV4-8,4-9 AV4-8,4-9 AV4-8,4-9 CN14:C CN13:A CN12:C CN15:A CN15:C 47R no stuff CN14:A CN13:C CN12:A... -
Page 7: Input Pcb Schematic (Tone Control)
Cambridge Audio Azur 540A V2.0 Amplifier SW2:B +15V VR2:A 47U NP 16V B5K LINEAR SW-DPDT 150k Tone Defeat 100U 25V EL LK27 LK24 LK25 10N PP 63V LK10MM LK10MM LK10MM LK21 RL1:B 1N5 63V PE LK15MM RCh In LK16 100U 25V EL... -
Page 8: Input Pcb Schematic (Protection Circuitry)
Cambridge Audio Azur 540A V2.0 Amplifier Speaker Cable Shor t Circuit Detector Speaker short circuit tester Senses a DC resistance of 2 ohms or less LK14 LK103 +5Volts LK10MM LK10MM Speaker PCB Contr ol SPEAKER B SWITCHING (for relay) 100N 50V X7R... -
Page 9: Input Pcb Schematic (Headphone Driver)
Cambridge Audio Azur 540A V2.0 Amplifier BD139 R118 U1:B 560R RCh HP Out 100R (Rch Out) No Stuff NE5532N 180R 560R R119 BD139 360R Main BD140 10N 63V PE RSW1 2,5MM 2W ST HEADER RSW2 Main 10R 2W Main 10R 2W... -
Page 10: Input Pcb Layout (Top Side)
Cambridge Audio Azur 540A V2.0 Amplifier Super Hi-Fidelity Ultra Linear Preamp Stage To enhance viewing, please print to A3 AP17649/4 Input PCB Board Layout (Top Side) -
Page 11: Input Pcb Layout (Bottom Side)
Cambridge Audio Azur 540A V2.0 Amplifier To enhance viewing, please print to A3 AP17649/4 Input PCB Board Layout (Bottom Side) -
Page 12: Input Pcb Assembly Bom
AP17652/5 Cambridge Audio Azur 540A V2.0 Amplifier Input PCB Assembly BOM AP Part Value Description/Type Factory Part No. Component Ident Notes RESISTORS 0.25W metal film R1, 3, 6, 8. See Input Schematic (Protection 0.25W metal film Circuitry) 0.25W metal film R53, 54 0.25W metal film... -
Page 13: Input Pcb Assembly Bom
AP17652/5 Cambridge Audio Azur 540A V2.0 Amplifier Input PCB Assembly BOM AP Part Value Description/Type Factory Part No. Component Ident Notes 105 degree Polarised 100uF 25V C28, 98. Electrolytic 470uF 25V Polarised Electrolytic C94, 97 1000uF 35V Polarised Electrolytic 1102-102034-000... -
Page 14: Voltage Select Switch Pcb Schematic
Cambridge Audio Azur 540A V2.0 Amplifier FROM J4 (Common) VOLTSELECT RF1002B 115/230V Marking BROWN (230V) BLACK (115V) To enhance viewing, please print to A3 AP17977/2 Voltage Select Switch PCB Schematic... -
Page 15: Voltage Select Pcb Layout (Top Side)
Cambridge Audio Azur 540A V2.0 Amplifier To enhance viewing, please print to A3 AP17977/2 Voltage Select Switch PCB Layout (Top Side) -
Page 16: Voltage Select Pcb Layout (Bottom Side)
Cambridge Audio Azur 540A V2.0 Amplifier To enhance viewing, please print to A3 AP17977/2 Voltage Select Switch PCB Layout (Bottom Side) -
Page 17: Voltage Select Pcb Assembly Bom
Cambridge Audio Azur 540A V2 Voltage Selector PCB Assembly BOM AP17980/1 Value Description/Type Component Ident Factory Part Number Notes CONNECTORS RF1002B Voltage Selector 2406-010200-000 Note: resistors, capacitors and 'other' electronic components are not usually stocked by the manufacturer. Please obtain these locally. -
Page 18: Mains Pcb Schematic
Cambridge Audio Azur 540A V2.0 Amplifier Mains Toroid TRANSFORMER RL1:C Mains Toroid TRANSFORMER Switch Switch TERMINAL TERMINAL RELAY Secondary 1 RL1:B 20MM T6.3AL earth TO VOLT SELECT POLYFUSE 1-1A TERMINAL TERMINAL TERMINAL RELAY 1N X1/Y1 IEC-SOC CCDE102MB TERMINAL 3,96MM 3W ST HEADER... -
Page 19: Front Panel Pcb Schematic
Cambridge Audio Azur 540A V2.0 Amplifier 2,5MM 6W 90 HEADER 2,5MM 2W 90 HEADER 100n CN10 DGND CRS1 Chassis LINK10MM 220R TERMINAL CHANNEL LED CHANNEL LED CHANNEL LED CHANNEL LED CHANNEL LED 220R DGND 10N 50V NP0 LINK10MM LINK10MM HP Detect... -
Page 20: Mains & Front Panel Pcb Layout (Top Side)
Cambridge Audio Azur 540A V2.0 Amplifier To enhance viewing, please print to A3 AP17657/1 Front Panel & Mains PCB Layout (Top Side) -
Page 21: Mains & Front Panel Pcb Layout (Bottom Side)
Cambridge Audio Azur 540A V2.0 Amplifier To enhance viewing, please print to A3 AP17657/1 Front Panel & Mains PCB Layout (Bottom Side) -
Page 22: Mains & Front Panel Pcb Assembly Bom
Cambridge Audio Azur 540A Front Panel and Mains PCB Assembly BOM AP17660/1 AP Part Value Description Factory Part No. Component Ident Notes RESISTORS 220R 0.25W metal film R5, 7, 12, 20, 23 540A 12 R1, 4, 6, 8, 13, 16-19, 21, 22, 0.25W metal film... -
Page 23: Amp Pcb Schematic (Right Channel)
Cambridge Audio Azur 540A V2.0 Amplifier 220U 63V EL LK27 LINK20MM +45V R +45V. R R AMP 10R 8th LK26 2SC2240GR LK15MM LK31 LK8MM 150R 8th 10U 63V EL 47N 63V PE 150R 8th 2k2 8th 1N4004 MPSA92 LK33 1k 8th... -
Page 24: Amp Pcb Schematic (Protection)
Cambridge Audio Azur 540A V2.0 Amplifier +45V P H16A H16B LK23 R112 LK43 +45V. R +45V P 1N4148 LK7,5MM LK7,5MM 100k 8th 100k 8th R100 LK24 15k 8th 15k 8th R120 PIC DC Detect LK7,5MM DGND 10U 25V NP 10k 8th... -
Page 25: Amp Pcb Schematic (Power Amp)
Cambridge Audio Azur 540A V2.0 Amplifier +45V L +45V R F8AL 20MM WIRE LINK WIRE LINK 1N5402 1N5402 WIRE LINK FOR 540A ONLY +45V P no stuff 100N 100V MCERAMIC 1N5402 1N5402 2200U 50/63V EL 105 2200U 50/63V EL 105... -
Page 26: Amp Pcb Schematic (Left Channel)
Cambridge Audio Azur 540A V2.0 Amplifier 220U 63V EL +45V. L +45V L LINK20MM L AMP 10R 8th 2SC2240GR LK15MM LK10 LK8MM 2k2 8th 150R 8th 150R 8th 10U 63V EL 47N 63V PE 1k 8th MPSA92 LK12 100k 8th... -
Page 27: Amp Pcb Layout (Top Side)
Cambridge Audio Azur 540A V2.0 Amplifier To enhance viewing, please print to A3 AP17653/1 Amp PCB Board Layout (Top Side) -
Page 28: Amp Pcb Layout (Bottom Side)
Cambridge Audio Azur 540A V2.0 Amplifier To enhance viewing, please print to A3 AP17653/1 Amp PCB Board Layout (Bottom Side) -
Page 29: Amp Pcb Assembly Bom
AP17656/2 Cambridge Audio Azur 540A V2 Amp PCB Assembly BOM AP Part Value Description Reference Factory Part No Comments Capacitors 540A - 3 100nF 100V Monolithic Ceramic C15,C48,C59,C71 1106-104064-001 540A only C48 is not fitted 640A - 4 1nF 63V... - Page 30 AP17656/2 Cambridge Audio Azur 540A V2 Amp PCB Assembly BOM AP Part Value Description Reference Factory Part No Comments R2,R22,R31,R38,R42, 100k 8th R47,R63,R69,R86,R8 8,R96,R99,R109,R112 150R 8th R3,R6,R46,R51 18R 8th R4,R49 R5,R19,R40,R50,R10 1k 8th 3,R107 91k 8th R25,R33,R62,R71 R7,R52,R77,R105,R1 10k 8th...
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Page 31: Amp Pcb Assembly Bom
AP17656/2 Cambridge Audio Azur 540A V2 Amp PCB Assembly BOM AP Part Value Description Reference Factory Part No Comments Q9,Q10,Q12,Q13,Q 17-Q20,Q31,Q36- PY537 MPSA42 NPN High Voltage 1300-420000-100 Q38,Q40,Q41,Q43- MPSA14 NPN Darlington Q34,Q35 1300-140000-100 Note: resistors, capacitors and other 'generic' electronic components are not usually stocked... -
Page 32: Abus Module Pcb Schematic
Cambridge Audio Azur 540A V2.0 Amplifier +12V +24V IN L7812 +24V LK7,5MM 100R 0.25W Fusible 1N4004 10uF 16V EL 220uF 35V EL 1N 50V CERAMIC 100n 50V X7R 100n 50V X7R RICCO PCB JACK 100n 50V X7R 100U 16V EL... -
Page 33: Abus Module Pcb Layout (Top Side)
Cambridge Audio Azur 540A V2.0 Amplifier LK13 LK11 LK12 To enhance viewing, please print to A3 AP17708/4 Abus Module PCB Layout (Top Side) -
Page 34: Abus Module Pcb Layout (Bottom Side)
Cambridge Audio Azur 540A V2.0 Amplifier To enhance viewing, please print to A3 AP17708/4 Abus Module PCB Layout (Bottom Side) -
Page 35: Abus Pcb Assembly Bom
AP17711/1 Cambridge Audio Azur 540A V2 A-Bus PCB BOM AP Part Value Description Factory Part No Component Ident NOTES RESISTORS 0.125W metal film 0.125W metal film R17, 18, 39, 40, 47, 48 100R 0.125W metal film R5, 9, 10, 14, 15, 28, 29 220R 0.125W metal film... -
Page 36: Ic Pin Layout Details
Cambridge Audio Azur 540A Amplifier V2.0 IC Pin Layout Details Input PCB BD140 (Q1 & Q4) BD139 (Q2, Q3, Q5 & Q6) BC327 (Q7) BC337 (Q8) MPSA14 (Q9) NE5532 (U1, U5, U6, U7, U9, U10, U12, U13, U14, U15, U16,... - Page 37 7915 (U2) 7805 (U3) 7815 (U4) LM393 (U8) TC9163AF (U11)
- Page 38 Power Amp PCB SAP15PY (U1 & U3) SAP15NY (U2 & U4) 2SC2240GR (Q1, Q6, Q7, Q15, Q23, Q24, Q26 & Q32) MJE350 (Q2 & Q27)
- Page 39 MPSA92 (Q3, Q4, Q8, Q25, Q28, Q29, Q30, Q33, Q39 & Q42) 2SA970GR (Q5, Q11, Q14, Q16, Q21 & Q22) MPSA42 (Q9, Q10, Q12, Q13, Q17, Q18, Q19, Q20, Q31, Q36, Q37, Q38, Q40, Q41, Q43, Q44 & Q45) MPSA14 (Q34 & Q35)
- Page 40 Front Panel & Mains PCB MPSA14 (Q4) BC337 (Q1 & Q2) PIC16F72-I/SP BA6218 (U1) M74HC4094 (U3)
- Page 41 TSOP1836 (U4) A-BUS PCB BC337 (Q1, Q2, Q3 & Q5) BC327 (Q4) 4011 (U1) TSOP1836 (U2)
- Page 42 TSOP1837 (U3) OP4N25 (U4) NJM5532 (U5 & U6) 7812 (U7)