Cambridge Audio Azur 540A V2 User manual

Gallery Court Hankey Place London SE1 4BB UK
Tel: [phone] Fax: [phone]
540A V2
Issue Date: 31st March 2006
_________________________________________________________________________________________
SERVICE MANUAL
_________________________________________________________________________________________
SPECIFICATIONS:
Power Output 60W (into 8Ω)
90W(into4Ω)
THD (unweighted) <0.002% @ 1kHz, of rated power
<0.070% 20Hz – 20kHz, of rated power
<0.025% 20Hz – 20kHz @ 10w
Frequency response (-1dB) 5Hz – 50kHz
S/N ratio (ref 1w) >85dB
Input impedances 47kohms
Power Amp damping factor >100
Max power consumption 650w
Min/On power consumption <35w (no signal)
Standby power consumption <10w
Bass / Treble controls Shelving, ultimate boost/cut + /-7.5dB
@ 20Hz and 20kHz
Dimensions 100 x 430 x 310mm
(3.9 x 16.9 x 12.2”)
Weight 7.4kg (16.3Lbs)
AP19973/1
1

540A V2.0 SERVICE MANUAL
TABLE OF CONTENTS
Safety Precautions & Important Notes 3
Exploded Diagram 4
Input PCB Schematic (Power Supply) 5
Input PCB Schematic (Buffers and Switches) 6
Input PCB Schematic (Tone Control) 7
Input PCB Schematic (Protection Circuitry) 8
Input PCB Schematic (Headphone Driver) 9
Input PCB Layout (Top Side) 10
Input PCB Layout (Bottom Side) 11
InputPCBAssemblyBOM 12-13
Voltage Select Switch PCB Schematic 14
Voltage Select PCB Layout (Top Side) 15
Voltage Select PCB Layout (Bottom Side) 16
Voltage Select PCB Assembly BOM 17
MainsPCBSchematic 18
Front Panel PCB Schematic 19
Mains & Front Panel PCB Layout (Top Side) 20
Mains & Front Panel PCB Layout (Bottom Side) 21
Mains & Front Panel PCB Assembly BOM 22
Amp PCB Schematic (Right Channel) 23
AmpPCBSchematic(Protection) 24
AmpPCBSchematic(PowerAmp) 25
Amp PCB Schematic (Left Channel) 26
Amp PCB Layout (Top Side) 27
Amp PCB Layout (Bottom Side) 28
AmpPCBAssemblyBOM 29-31
AbusModulePCBSchematic 32
Abus Module PCB Layout (Top Side) 33
Abus Module PCB Layout (Bottom Side) 34
Abus PCB Assembly BOM 35
IC Pin Layout Details 36-42
2

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.
© 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.
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.
3

21
17
25
10
18 (a)
8
19 (b)
20 22
16
12
23
6
14
3
12
4
24 5
15 11 9
13
7
Drawing ref AP Part Factory part number Description
1 PY687 6560-150001-000A VOLUME KNOB ALUMINIUM SKIN AP133601 SILVER (use with PY680+PY681)
1 PY686 6560-150001-000 VOLUME KNOB ALUMINIUM SKIN AP133601 BLACK (use with PY680+PY681)
2 PY592 6050-150004-002-02 Azur-640A SELECTOR KNOB SILVER
2 PY593 6050-150004-002-01 Azur-640A SELECTOR KNOB BLACK
3 PY719 6050-150012-000-01 7MM TAC SWITCH BUTTON (BLACK)
3 PY720 6050-150012-000A01 7MM TAC SWITCH BUTTON (SILVER)
4 6050-150013-000A01 7MM PUSH SWITCH BUTTON SILVER FOR Azur-640A
4 6050-150013-000 7MM PUSH SWITCH BUTTON BLACK FOR Azur-640A
5 6050-117821-000-02 Azur-640A CONTROL BOX BUTTON SILVER
5 6050-117821-000-01 Azur-640A CONTROL BOX BUTTON BLACK
6 PY541 6050-150010-000A01 PLASTIC FOOT SILVER
6 PY531 6050-150010-000 PLASTIC FOOT BLACK
7 PY544 6600-170100-000 FOOT PAD FOR AZUR RANGE
8 PY1058 3200-076771E000 115/230V 30V*2/3A 17V*2/0.4A Azur-540A V2 AP175704
9 PY1032 6550-150017-001-02 LARGER SIDE PANEL SILVER PAINTED
9 PY1033 6550-150017-001-01 LARGER SIDE PANEL BLACK PAINTED
10 PY1034 6550-150037-000-02 V2 AMP TOP PANEL SILVER PAINTED
10 PY1035 6550-150037-000-01 V2 AMP TOP PANEL BLACK PAINTED
11 PY1036 8554-015010-701 LARGER SUPPORT FRONT ASSY (WITH TWO BRASS INSERTS)
12 PY1037 8554-015020-701 LARGER SUPPORT REAR ASSY (WITH TWO BRASS INSERTS)
13 PY1059 8554-015001-302 Azur-540A V2-Silver AMP FRONT PANEL ASSY
13 PY1060 8554-015011-302 Azur-540A V2-Black AMP FRONT PANEL ASSY
14 PY1040 9464-015002-041 Azur-640A/540A V2 PIC CONTROL BOARD ASSY REV A
15 PY1041 9464-015002-171 Azur-640A/540A V2 POWER SWITCH PCB REV A
PY1042 9464-015002-191 Azur-640A/540A V2 LED PCB ASSY REV A
16 PY1061 9454-015002-071 Azur-540A V2 POWER INPUT BOARD ASSY REV A
17 PY1062 9454-015002-091 Azur-540A V2 AMP POWER PCB ASSY REV A
18 PY1045 9464-015002-001 640A/540A V2 PROTECTION CIRCUITRY PCB-A ASSY REV A
19 PY1046 9464-015002-101 640A/540A V2 PROTECTION CIRCUITRY PCB-B ASSY REV A
20 PY1047 9464-015002-331 Azur-640A/540A A-Bus hub PCB ASSY REV A
21 PY1048 9464-015002-341 Azur-640A/540A V2 INPUT PCB ASSY REV A
22 PY1049 9464-015002-541 Azur-540A/640A V2 SPEAKER CONN. BOARD ASSY REV A
23 PY944 9805-054010-001 AZUR-540A/C,640A/C V2.0 REMOTE CONTROL ASSY REV A
PY945 6040-150002-000-01 BATTERY-DOOR FOR Azur R/C BLACK PAINTED
24 PY1056 6550-150021E001A03 AZUR 540A V2.0 FRONT PANEL-Silver (Metal only)
24 PY1054 6550-150021E001-03 AZUR 540A V2.0 FRONT PANEL-Black (Metal only)
25 PY515 7002-608010-001 Screw M2.6 x 8 M/C Torx Recessed 1/K Head Black
25 PY516 7002-608010-006 Screw M2.6 x 8 M/C Torx Recessed 1/K Head En-Plated
PY1051 5100-641500E300 AZUR 540A/640A V2 USER'S MANUAL (AP183031)
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Cambridge Audio Azur 540A V2.0 Amplifier
AP17649/5 Input PCB Schematic (Power Supply)
VI
1VO 3
GND
2
U3 L7805
C26
47u 16V
VI
1VO 3
GND
2
U4
L7815
VI
2VO 3
GND
1
U2
L7915
+5V
DGND
D2
1N4004
D3
1N4004
D4
1N4004
D5
1N4004
C35
100N 100V X7R
C37
100N 100V X7R
C27
100N 50V X7R
C25
100N 50V X7R
C31
47N PE 63V
C34
47N PE 63V
C30
47N PE 63V
C29
47N PE 63V
C28
100U 25V EL 105
C98
100U 25V EL 105
GENERAL NOTES
1.
2.
3.
4.
5.
1
2
3
CN8
3,96MM 3W ST HEADER
C36
100N 100V X7R
Unreg for Relays LK40
LK10MM
Main
+15V
-15V
LK86
LINK10MM
LK83
LINK10MM
LK79
LINK10MM
LK75
LINK10MM
LK71
LINK10MM
LK63
LINK10MM
LK67
LINK10MM
-15V
-15V
LK82
LINK10MM
LK78
LINK10MM
LK74
LINK10MM
LK70
LINK10MM
LK64
LINK10MM
LK66
LINK10MM
+15V
+15V
LK88
LINK10MM
LK47
LINK10MM
LK44
LINK10MM
LK41
LINK15MM
LK42
LINK15MM
+15V
+15V
-15V
-15V
LK13
LINK10MM
LK6
LINK15MM
LK7
LINK15MM
LK12
LINK15MM
LK17
LINK15MM
LK23
LINK10MM
LK26
LINK10MM
LK28
LINK10MM
LK22
LINK10MM
LK29
LINK10MM
LK30
LINK10MM
LK32
LINK15MM
LK31
LINK10MM
LK34
LINK15MM
C32
1000U 35V EL
C33
1000U 35V EL
LK50
LINK15MM
LK48
LINK15MM
AC Sense
R55
4k7
C38
1U 25V
D1
1N4004
R56
4k7
Q7
BC327
R114
4k7
+5V
PIC Standby Relay
Standby Relay
Main
LK98
LINK10MM
J7
TERMINAL
Main Main
Rev2: D8 Removed, LK105 and 106 added.
LK105
LK10MM
LK106
LK10MM
D9
1N4004
D10
1N4004
Rev4: D9 and D10 added.
C38
1U 25V
R56
4k7
Q7
BC327
R114
4k7
+5V
PIC Standby Relay
Standby Relay
LK105
LK10MM
LK106
LK10MM
D8
1N4148
Revision 1
86-756-8687998
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Cambridge Audio Azur 540A V2.0 Amplifier
AP17649/5 Input PCB Schematic (Buffer and Switches)
Abus GND
GENERAL NOTES
1.
2.
3.
4.
5.
2
3
1
8 4
U9:A
NE5532N
R112 220R 1/8W
R111 220R 1/8W
6
5
7
U9:B
NE5532N
2
3
1
8 4
U12:A
NE5532N
6
5
7
U12:B
NE5532N
-15V
+15V
+15V
-15V
+15V
-15V
U6
U6
SW GND
LCh In
RCh In
LCh Out
RCh Out
L
R
Vss
1
L-S1
2
L-S2
3
L-S3
4
L-COM1
5
L-S4
6
L-S5
7
L-S6
8
L-COM2
9
L-S7
10
L-S8
11
L-COM3
12
ST
13
GND
14
Vdd 28
R-S1 27
R-S2 26
R-S3 25
R-COM1 24
R-S4 23
R-S5 22
R-S6 21
R-COM2 20
R-S7 19
R-S8 18
R-COM3 17
DATA 16
CLK 15
U11
TC9163AF
6
CN14:D
AV4-8,4-9
3
CN13:B
AV4-8,4-9
6
CN13:D
AV4-8,4-9
Aux
CD
DAB
DVD
MD
TO1 TO2
TM PO
3
CN12:B
AV4-8,4-9
6
CN12:D
AV4-8,4-9
3
CN15:B
AV4-8,4-9
PreOut Left
PreOut Right
PreOut Left
PreOut Right
6
CN15:D
AV4-8,4-9
1
2
CN16:A
AV2-8,4-9
SW GND
3
CN16:B
AV2-8,4-9
2 3
1
84
U14:A
NE5532N
-15V
+15V
C67
47n 63V PE
C68
47n 63V PE
R96
47k 1/8W
2 3
1
84
U13:A
NE5532N
R93
47k 1/8W
2 3
1
84
U15:A
NE5532N
-15V
+15V
C71
47n 63V PE
C72
47n 63V PE
R89
47k 1/8W
2 3
1
84
U16:A
NE5532N
R85
47k 1/8W
2 3
1
84
U17:A
NE5532N
-15V +15V
C76
47n 63V PE
C75
47n 63V PE
R81
47k 1/8W
2 3
1
84
U18:A
NE5532N
R73
47k 1/8W
6 5
7
U13:B
NE5532N
-15V
+15V
C70
47n 63V PE
C69
47n 63V PE
R91
47k 1/8W
6 5
7
U14:B
NE5532N
R95
47k 1/8W
6 5
7
U16:B
NE5532N
-15V
C74
47n 63V PE
C73
47n 63V PE
R83
47k 1/8W
6 5
7
U15:B
NE5532N
R87
47k 1/8W
6 5
7
U18:B
NE5532N
-15V
+15V
C44
47n 63V PE
C45
47n 63V PE
R110
47k 1/8W
6 5
7
U17:B
NE5532N
R79
47k 1/8W
C91
47N PE 63V
C92 47N PE 63V
C41
47N 63V PE
C42
47N 63V PE
R104
1k8
R105
1k8
R103
1k8
R102
1k8
C90
10P 50V NPO
C93
10P 50V NPO
R99
100R
R98
100R
C88
100N 50V X7R
C89
100N 50V X7R
R109
1k 1/8W
R78
1k 1/8W
R82
1k 1/8W
R86
1k 1/8W
R90
1k 1/8W
R94
1k 1/8W
R97
1k 1/8W
R92
1k 1/8W
R88
1k 1/8W
R84
1k 1/8W R80
1k 1/8W
R72
1k 1/8W
C83
100p 50V NP0
C48
100p 50V NP0
C53
100p 50V NP0
C57
100p 50V NP0
C61
100p 50V NP0
C65
100p 50V NP0
C66
100p 50V NP0
C62
100p 50V NP0
C58
100p 50V NP0 C54 100p 50V NP0
C50
100p 50V NP0
C46
100p 50V NP0
R75
220R 1/8W
R76
220R 1/8W
R74
220R 1/8W
R77
220R 1/8W
3
CN14:B
AV4-8,4-9
1
2
CN14:A
AV4-8,4-9
4
5
CN14:C
AV4-8,4-9
1
2
CN13:A
AV4-8,4-9
4
5
CN13:C
AV4-8,4-9
1
2
CN12:A
AV4-8,4-9
4
5
CN12:C
AV4-8,4-9
1
2
CN15:A
AV4-8,4-9
4
5
CN15:C
AV4-8,4-9
LK60
LINK15MM
LK51
LK15MM
+15V
C64
10U NP 16V
C63
10U NP 16V
C60
10U NP 16V
C59
10U NP 16V
C56
10U NP 16V
C55
10U NP 16V
C52
10U NP 16V
C51
10U NP 16V
C49
10U NP 16V
C47
10U NP 16V
C81
10U NP 16V
C82
10U NP 16V
LK62 LK10MM
LK57
LK10MM
LK56
LK15MM
LK53
LK15MM
LK55 LK10MM
LK54
LK10MM
LK92
LK10MM
LK90
LK15MM
LK91
LK15MM
LK9
LK15MM
LK8
LK15MM
U6
U6
LK89
LK15MM
LK99
LK15MM
LK97 LK10MM
LK93
LK10MM
LK94
LK10MM
R100
470k
R101
470k
LK95
LK10MM
LK96
LINK15MM
LCh HP Out
RCh HP Out
LK5 LK15MM
LK43 LK15MM
1
2
3
CN10
2,5MM 3W ST HEADER
ABUS Audio Out
R106
560R
R107
560R
1
2
3
4
5
6
7
CN5
2,5MM 7W ST HEADER
To PIC
Clock
Data
Strobe
DGnd from PIC
Control Bus IR
ABUS IR
Amp Mute
Control Bus IR
ABUS IR
ABUS Status
RCh
GND
LCh
1
2
3
4
5
CN9
2,5MM 5W ST HEADER
ABUS Control Signals
ABUS PCB DGnd
LK101
LK10MM
C87
1N 50V NP0
J1
TERMINAL
R113
47R no stuff
C86
1N 50V NP0 no stuff
J2
TERMINAL
C80
100p 50V NP0
C78
100p 50V NP0
U6
U6
C77
100p 50V NP0
C79
100p 50V NP0 U6
U6
C85
100P 50V NP0
C84
100P 50V NP0
2 3
1
84
U10:A
NE5532N
-15V
+15V
C40
47n 63V PE
C39
47n 63V PE
U6 U6
6 5
7
U10:B
NE5532N
U6
U6
U6
LK49
LK15MM
LK52
LINK15MM
LK58
LK10MM
LK61
LK10MM
LK59
LINK15MM
ABUS PCB +5V +5VOLTS
LK100
LK15MM
LK85
LK10MM
LK87
LK10MM
LK68
LK10MM
LK69
LK10MM
LK73
LK10MM
LK77
LK10MM
LK81
LK10MM
LK84
LK10MM
LK80
LK10MM
LK76
LK10MM
LK72
LK10MM LK65
LK10MM
R58 1k8
R59 1k8
J4
TERMINAL
J5
TERMINAL
J6
TERMINAL
J8
TERMINAL
R61
3k6
U6
R60
3k6
U6
U6
Rev1: Resistors R72,78,80,82,84,86,88,90,92,94,97,109 changed to 75R
GND Links on underside
Amp Mute
Standby Relay
Rev4: Resistors R72,78,80,82,84,86,88,90,92,94,97,109 changed to 1k
86-756-8687998
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Cambridge Audio Azur 540A V2.0 Amplifier
AP17649/5 Input PCB Schematic (Tone Control)
GENERAL NOTES
1.
2.
3.
4.
5.
R20
4k7
R23
1k1
R24
1k1
R17
2k2
R19
2k2
SW2:A
SW-DPDT
Tone Defeat Out
-15V
+15V
R36
2k2
R35
2k2
R22
4k7
R26
1k1
R25
1k1
R18
2k2
R21
2k2
SW2:B
SW-DPDT
Tone Defeat
-15V
+15V
R37
2k2
R38
2k2
U2
out
Out
-15V
+15V
U2
U4U4 OutOut
U2
+15V
-15V
2
3
1
8 4
U6:A
NE5532N
6
5
7
U6:B
NE5532N
2
3
1
8 4
U5:A
NE5532N
6
5
7
U5:B
NE5532N
U2 6
5
7
U7:B
NE5532N
2
3
1
84
U7:A
NE5532N
RCh In
LCh In
RCh Out
LCh Out
U2
U4
U4
R15
150k
R14
150k
R16
150k
R13
150k
4 6
5
VR3:B
20K MOTORISED DUAL POT
1 3
2
VR3:A
20K MOTORISED DUAL POT
4 6
5
VR4:B
MN20K BALANCE
13
2
VR4:A
MN20K BALANCE
13
2
VR2:A
B5K LINEAR
46
5
VR2:B
B5K LINEAR
13
2
VR1:A
B5K LINEAR
46
5
VR1:B
B5K LINEAR
1
2
3
4
5
6
CN3
H6 2.54mm
TO POWER AMP
C5
47U NP 16V
C11
47U NP 16V
C4
47U NP 16V
C7 47U NP 16V
RCh Out
LCh Out
C103
47N 63V PE
C102
47N 63V PE
C14
47N 63V PE
C16
47N 63V PE
C9
47N 63V PE
C10
47N 63V PE
C18
10P 50V NPO
C23
10P 50V NPO
C8
10P 50V NPO
C13
10P 50V NPO
C19
1N5 63V PE
C20
1N5 63V PE
C22
680N 63V PE
C21
680N 63V PE
LK37
LK15MM
U4
LK25
LK10MM
LK24
LK10MM
LK21
LK15MM
LK19
LK15MM
R33
22R
R34
22R
LK35
LINK15MM
LK20
LK15MM
LK27
LK10MM
LK18
LK15MM
R29
22k
R31
22k
Out
Out
C6
10N PP 63V
C12
10N PP 63V
C3
10N PP 63V
C24 10N PP 63V
C104
10U NP 16V
C101
10U NP 16V
C105
10N PP 63V
C100
10N PP 63V
LK36
LINK15MM
R32
1k5
R30
3k
Out
R27
1k5
R28
3k
Out
C106
10P 50V NPO
C99
10P 50V NPO
C15
100U 25V EL
C17
100U 25V EL
LK33
LK15MM
J3
TERMINAL
1
2
CN17
2MM 2W ST HEADER
3
4
5
RL1:B
ME2-5S
6
7
8
RL1:C
ME2-5S
1
2
RL1:A
ME2-5S
+5VOLTS
D8
1N4004
Q9
MPSA14
R122
10k
R123
1k
MAIN
Amp Mute
Rev2: RL1,D8,Q9,R122,R123,LK104,107-109 added.
LK16
LK10MM
LK104
LK10MM
LK107
LK10MM
LK108
LK15MM
LK109
LK15MM
86-756-8687998
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Cambridge Audio Azur 540A V2.0 Amplifier
AP17649/5 Input PCB Schematic (Protection Circuitry)
+5Volts
R66
1k
For 1mA
R64
10k
R67
100R
R65
2R7
DGND
3
2
1
84
U8:A
LM393 D7
1N4148
+5V
Speaker short circuit tester
R69
4k7
(Open Collector Output)
Senses a DC resistance of 2 ohms or less
D6
1N4004
PIC VI/Short
C43
100N 50V X7R
Speaker Test
DGND
+5V
SW1:B
SW-DPDT
TAPE
SPEAKER B SWITCHING (for relay)
Speaker Test
Speaker A Relay
Unreg for Relays
1
2
3
4
5
6
CN11
2,5MM 6W ST HEADER
To Speaker PCB CN1
PIC Standby Relay
Unreg for Relays
DGND
1
2
3
CN7
2,5MM 3W ST HEADER
R57
220R 2W Carbon
R108
220R 2W Carbon
PIC VI/Short
PIC DC
PIC CLIP
PIC Temp
Speaker A Relay
PIC Standby Relay
1
2
3
4
5
6
7
8
CN6
2,5MM 8W ST HEADER
To PIC
GENERAL NOTES
1.
2.
3.
4.
5.
Mains PCB Control
Speaker PCB Control
PIC Protection signals
Speaker Cable Short Circuit Detector
LK103
LK10MM
LK14
LK10MM
LK15
LK10MM
5
6
7
U8:B
LM393
LK102
LK10
LINK15MM
LK46
LK11
LINK15MM
LK45
LK10MM
1
2
3
4
5
CN4
2,5MM 5W ST HEADER
DGND
PIC VI/Short
PIC DC
PIC CLIP
Temp Sense
R116
10k
R115
10k
DGND
+5V
PIC Temp
R63
910R
910 / (910 + 10k) with ZP221A501E
voltage gives 100deg C cutout
+5Volts
Temp Sense
R71
4k7
R70
10k R117
4k7
Open Collector Output
Q8
BC337 LK39
LK10MM
LK38
R68
100k
R62
no stuff
C108
100N 50V X7R
C107
100U 16V EL
DGND
+5V
Rev3: R65 Changed from 10R to 8R2
Rev4: R65 Changed from 8R2 to 4R7
Rev5: R65 Changed from 4R7 to 2R7
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Cambridge Audio Azur 540A V2.0 Amplifier
AP17649/5 Input PCB Schematic (Headphone Driver)
Main
+15V
-15V
R54
10R
R53
10R
6
5
7
U1:B
NE5532N
R8
1R
R6
1R
R41
2k7
R40
3k3
R43
560R
R42
560R
R39
5k6
R7
5k6
Q6
BD139
Q5
BD139
Q4
BD140
R9
180R
Main
RSW1
RSW2
R
L
GND
2
3
1
7
8
CN1
HEADPHONE JACK
Main
C96
47N 63V PE
C95
47N 63V PE
2
3
1
84
U1:A
NE5532N
R3
1R
R1
1R
R46
2k7
R45
3k3
R48
560R
R47
560R
R44
5k6
R2
5k6
Q3
BD139
Q2
BD139
Q1
BD140
R4
180R
Main
GENERAL NOTES
1.
2.
3.
4.
5.
R11
10R 2W
R12
10R 2W
RCh HP Out
R52
100R
R51
No Stuff
Main
LCh HP Out
R49
100R
R50
No Stuff
Main
C97
470U 25V EL
C94
470U 25V EL
R5
360R
R10
360R
C2
10N 63V PE
C1
10N 63V PE
Main
LK2
LINK10MM
LK1
LINK10MM
LK3
LINK10MM
LK4
LINK10MM
1
2
CN2
2,5MM 2W ST HEADER
R118
1k5
R119
3k
R120
1k5
R121
3k
Main
Main
Rev1: Resistors R118-121 added
(Rch Out)
(Lch Out)
Rev2: Resistors R11,R12,R118-121 values changed.
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Cambridge Audio Azur 540A V2.0 Amplifier
AP17649/4 Input PCB Board Layout (Top Side)
Super Hi-Fidelit y Ultra Linear Pr eamp Stage
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Cambridge Audio Azur 540A V2.0 Amplifier
AP17649/4 Input PCB Board Layout (Bottom Side)
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AP17652/5
A
P Part
No Value Description/Type Factory Part No. Qty Component Ident Notes
RESISTORS
1R 0.25W metal film 4 R1, 3, 6, 8.
2R7 0.25W metal film 1 R65 See Input Schematic (Protection
Circuitr
y)
10R 0.25W metal film 2 R53, 54
22R 0.25W metal film 2 R33, 34
100R 0.25W metal film 5 R49, 52, 67, 98, 99.
180R 0.25W metal film 2 R4, 9
360R 0.25W metal film 2 R5, 10
560R 0.25W metal film 6 R42, 43, 47, 48,106,107
910R 0.25W metal film 1 R63
1
K
0.25W metal film 2 R66,
(
R123
)
See In
p
ut Schematic
(
Tone Control
)
1K1 0.25W metal film 4 R23-26
1K5 0.25W metal film 4 R27, 32, (118,120) See Input Schematic (Headphone
Driver
)
1K8 0.25W metal film 6 R58, 59, 102-105.
2K2 0.25W metal film 8 R17-19, 21, 35-38
2K7 0.25W metal film 2 R41, 46
3K 0.25W metal film 4 R28, 30, R119, (R121) See Input Schematic (Headphone
Driver
)
3K3 0.25W metal film 2 R40, 45
3K6 0.25W metal film 2 R60, 61
4K7 0.25W metal film 8 R20, 22, 55, 56, 69, 71, 114, 117
5K6 0.25W metal film 4 R2, 7, 39, 44
10
K
0.25W metal film 5 R64, 70, 115, 116,
(
122
)
See In
p
ut Schematic
(
Tone Control
)
22
K
0.25W metal film 2 R29, 31
100K 0.25W metal film 1 R68
150K 0.25W metal film 4 R13-16
470K 0.25W metal film 2 R100, 101
1k 0.125W metal film 12 R72, 78, 80, 82, 84, 86, 88, 90, 92, 94,
97, 109.
See Input Schematic (Buffers and
Switches
)
220R 0.125W metal film 6 R74-77, 111, 112.
47K 0.125W metal film 12 R73, 79, 81, 83, 85, 87, 89, 91, 93, 95,
96, 110,
10R 2W Carbon 2 R11,12 See Input Schematic (Headphone
Driver
)
220R 2W Carbon 2 R57, 108
CAPACITORS
10
p
F 50V NP0 Ceramic 1181-100042-000 8 C8, 13, 18, 23, 90, 93, 99, 106.
100pF 50V NP0 Ceramic 1181-101042-000 18 C46, 48, 50, 53, 54, 57, 58, 61, 62, 65,
66, 77-80, 83, 84, 85
1nF 50V Ceramic 1100-102043-000 1 C87
100nF 50V Ceramic 1100-104043-000 6 C25, 27, 43, 88, 89, 108
100nF 100V Monol
y
thic Ceramic 1106-104064-001 3 C35, 36, 37.
1.5nF 63V Pol
y
ester film 2 C19, 20
10nF 63V Pol
y
ester film 1117-103052-000 2 C1, 2
47nF 63V Polyester film 1117-473053-000 30
C9, 10, 14, 16,29-31, 34, 39, 40, 41,
42, 44, 45, 67-76, 91,92,95, 96, 102,
103
680nF 63V Pol
y
ester film 2 C21, 22
10nF 63V Pol
yp
ro
py
lene film 6 C3, 6, 12, 24, 100, 105
10uF 16V Non Polarised
Electrol
y
tic 1105-100013-000 14 C47, 49, 51, 52, 55, 56, 59, 60, 63, 64, 81, 82, 101, 104
47uF 16V Non Polarised
Electrol
y
tic 4 C4, 5, 7, 11,
1uF 25V Polarised Electrol
y
tic 1102-107024-000 1 C38
47uF 16V Polarised Electrol
y
tic 1102-470014-000 1 C26
100uF 16V Polarised Electrol
y
tic 1102-101014-000 1 C107.
100uF 25V Polarised Electrol
y
tic 1102-101024-000 2 C15, 17
Cambridge Audio Azur 540A V2.0 Amplifier Input PCB Assembly BOM
Note: resistors, capacitors and other 'generic' electronics components are not usually stocked by
the manufacturer. Please obtain these locally.
12

AP17652/5
A
P Part
No Value Description/Type Factory Part No. Qty Component Ident Notes
Cambridge Audio Azur 540A V2.0 Amplifier Input PCB Assembly BOM
100uF 25V 105 degree Polarised
Electrol
y
tic 2 C28, 98.
470uF 25V Polarised Electrol
y
tic 2 C94, 97
1000uF 35V Polarised Electrol
y
tic 1102-102034-000 2 C32, 33
BD140 PNP Low power 2 Q1, 4
Q1 and Q2 must be thermally coupled
and Q4 and Q5 must be thermally
coupled, please see misc section for
p
arts
BD139 NPN Low power 4 Q2, 3, 5, 6,
Q1 and Q2 must be thermally coupled
and Q4 and Q5 must be thermally
coupled, please see misc section for
p
arts
PY219 BC327-25 PNP Si
g
nal 1301-327000-100 1 Q7
PY214 BC337-25 NPN Si
g
nal 1300-337000-100 1 Q8
NPN Darlin
g
ton 1300-140000-100 1 Q9 See In
p
ut Schematic
(
Tone Control
)
DIODES
PY319 1N4004 Rectifier 1401-140040-000 9 D1-6,(D8, D9, D10) See Input Schematic (Power Supply &
Tone Control
)
PY759 1N4148 Si
g
nal 1401-141480-000 1 D7
PY108 NE5532N 4155-320052-900 13 U1, 5-7, 9, 10, 12-18
L7915CV 1 U2
L7805 1 U3
L7815CV 1 U4
PY539 LM393 4139-300052-600 1 U8
PY476 TC9163AF 4191-630103-000 1 U11
POTS
PY1013 20kA Motorised Dual Volume
Pot 1062-003511E110 1 VR3 High Torque
MN20
k
Dual Balance Pot 1062-003518E160 1
V
R4 Hi
g
h Tor
q
ue
5kB Dual Linear Pot 1062-002518E130 2
V
R1, 2 Hi
g
h Tor
q
ue
SWITCH
PY045 2P2T Push Switch 2402-020200-010 2 SW1, 2
LINK10mm 24SWG Tinned Copper
Wire 70
LK1-4, 13, 22, 23, 26, 28-31, 44, 47,
63, 64, 66, 67, 70, 71, 74, 75, 78, 79,
82, 83, 86, 88, 98, 14-16,24, 25, 27,
38-40, 45, 46, 54, 55, 57, 58, 61, 62,
65, 68, 69, 72, 73, 76, 77, 80, 81, 84,
85, 87, 92-95, 97, 101-
103,(104,105,106,107)
See Input Schematic (Power Supply &
Tone Control)
LINK15mm 24SWG Tinned Copper
Wire 39
LK5, 8, 9, 18-21, 33, 37, 43, 49, 51,
53, 56, 89-91, 99, 100, 6, 7, 10-12, 17,
32, 34-36, 41, 42, 48, 50, 52, 59, 60,
96,
(
108,109
)
See Input Schematic (Tone Control)
PY584 5V Rela
y
4050-000005-002 1 RL1 See In
p
ut Schematic
(
Tone Control
)
INTEGRATED CIRCUITS
MISCELLANEOUS
TRANSISTORS
Note: resistors, capacitors and other 'generic' electronics components are not usually stocked by
the manufacturer. Please obtain these locally.
13

Cambridge Audio Azur 540A V2.0 Amplifier
AP17977/2 Voltage Select Switch PCB Schematic
J2
FROM J4 (Common)
SW1
VOLTSELECT RF1002B
115/230V Marking
J1
BROWN (230V)
J3
BLACK (115V)
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Cambridge Audio Azur 540A V2.0 Amplifier
AP17977/2 Voltage Select Switch PCB Layout (Top Side)
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Cambridge Audio Azur 540A V2.0 Amplifier
AP17977/2 Voltage Select Switch PCB Layout (Bottom Side)
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Cambridge Audio Azur 540A V2 Voltage Selector PCB Assembly BOM AP17980/1
Value Description/Type Qty Component Ident Factory Part Number Notes
CONNECTORS
RF1002B Voltage Selector 1 SW1 2406-010200-000
Note: resistors, capacitors and 'other' electronic components are not usually stocked by the
manufacturer. Please obtain these locally.
17

Cambridge Audio Azur 540A V2.0 Amplifier
AP17657/1 Mains PCB Schematic
earth 3
4
5RL1:B
RELAY
6
7
8RL1:C
RELAY
FU5
20MM T6.3AL
Mains Toroid TRANSFORMER
J1
TERMINAL
J2
TERMINAL
J3
TERMINAL
J4
TERMINAL
J5
TERMINAL
J6
TERMINAL
J7
TERMINAL
J13
BLUE/WHITE
J15
TO VOLT SELECT
L
N
E
CN3
IEC-SOC
1
2
RL1:A
RELAY
R2
1k
R1
10k
1
2
3
CN2
H3 2.54mm
D1
1N4004
Q3
MPSA14
C3
47N X1
C2
1N X1/Y1
CCDE102MB
C1
1N X1/Y1
CCDE102MB
1
2
3
CN1
3,96MM 3W ST HEADER
J8
EMC
Chassis Connection
3
4
5RL2:B
RELAY
6
7
8RL2:C
RELAY
J18
TERMINAL
J19
TERMINAL
J20
TERMINAL
J21
TERMINAL
Secondary 1
Secondary 2 (640A only)
Mains Toroid TRANSFORMER
Low Power secondary
High Power Secondaries
Power Amp supplies
1
2RL2:A
RELAY
D11
1N4004
R24
1k
R25
10k
Q4
MPSA14
640A only
F1
POLYFUSE 1-1A
F2
POLYFUSE 1-1A
LK11
LK15MM
LK10
LK10MM
LK9
LK15MM
J11
Switch
J12
Switch
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Cambridge Audio Azur 540A V2.0 Amplifier
AP17657/1 Front Panel PCB Schematic
Temp
MCLR
Chassis
CRS1
FREQ=4MHz
1
2
CN4
H2 2.54mm 90
MOTOR
C4
100n
FIN 1
GND1 2
RIN 3
NC 4
GND2 5
VCC 6
OUT2 7
COM 8
OUT1 9
U1
BA6218
+5V
DGND
R17
10k
R21
10k
R16
10k
+5V
DGND
DGND
C7
100n
R19
10k
D
2CLK
3STB
1OE
15
Q0 4
Q1 5
Q2 6
Q3 7
Q4 14
Q5 13
Q6 12
Q7 11
QS 9
QS 10
VDD
16 VSS 8
U3
74HC4094
R20
220R
+5V
C9
100n
D2
CHANNEL LED
D3
CHANNEL LED
D4
CHANNEL LED
D5
CHANNEL LED
D6
CHANNEL LED
D7
CHANNEL LED
SW7
STANDBY
SW6
CD
SW1
TUNER
SW2
AV
SW5
PHONO/AUX
SW3
TAPE MON
SW4
DVD
+5V
3
OPT
1
GND
2
U4
IR REC 3/5V 36KHZ
R18
10k
+5V
C11
100nF 50V X7R
+5V
DGND
R7
220R
LED Strobe
Data
Clock
Clock
Data
LED Strobe
vol up
vol down
vol up
vol down
R6
10k
R12
220R
LK6
LINK10MM
C5
100n
1
2
3
4
5
6
7
8
CN6
H8 2.54mm 90
DGND
+5V
LK5
LINK10MM
R8
10k
D8
Blue flat top LED
Standby
DGND
1
2
3
4
5
6
CN5
2,5MM 6W 90 HEADER
1
2
3
4
5
6
CN8
2,5MM 6W 90 HEADER
DGND
Q2
BC337
R4
10k
R23
220R
DGND
R5
220R
SNAP OFF SECTION (c)
R10 22R
R11 22R
R9 22R
Speaker A Relay
VI/Short
Standby Relay
Clip
DC
1
2
3
4
5
6
7
CN7
2,5MM 7W 90 HEADER
I2C Clock
I2C Data
I2C Switch Strobe
DGnd
CA Control Bus IR
ABUS IR
ABUS Status
1
2
CN10
2,5MM 2W 90 HEADER
HP Detect
DGnd
SNAP OFF SECTION (d)
DGND
DGND
RC6 17
RC5/SDO 16
RC4/SDI/SDA 15 RC3/SCK/SCL
14 RC2/CCP1
13 RC1/T1OSI
12 RC0/T1OSO/T1CKI
11 OSC2/CLKO
10
RA0/AN0
2
RA2/AN2
4
MCLR/Vpp
1
RA1/AN1
3
RA3/AN3/Vref
5
RB1 22
RB7/PGD 28
RA4T0CKi
6
RA5/AN4/SS
7
Vss2
8
OSC1/CLKI
9
RB2 23
RB3 24
RB6/PGC 27
RB4 25
RB5 26
VSS 19
RC7 18
VDD 20
RB0/INT 21
U2
PIC16F72I/SP
R13
10k
DGND
J14
TERMINAL
C8
10N 50V NP0
1 2 3 4 5 6
CN9
2,5MM 6W 90 HEADER
DGND
+5V
+5V
LK1
LINK10MM
MCLR
LK7
LINK10MM
DGND
Clock
Data
Switch Strobe
Switch Strobe
ABUS IR
ABUS IR
ABUS Status
ABUS Status
IR In
+5V
IR In
IR In
DGND
LK4
LINK10MM
R15 47R
C10
no stuff
LK3
LINK10MM
C12
10U 16V EL
R14
47R
D9 LED 3MM RED
protection
R3
2R2
J9
TERMINAL
(1)
J10
TERMINAL
J16
TERMINAL
(1) J17
TERMINAL
C6
220U 16V EL
Q1
BC337
R22
10k
R26
10k
DGND
LK2
LK7,5MM
LK8
LK15MM
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Cambridge Audio Azur 540A V2.0 Amplifier
AP17657/1 Front Panel & Mains PCB Layout (Top Side)
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