Cambridge Audio Azur 340A User manual

Gallery Court Hankey Place London SE1 4BB UK
Tel: [phone] Fax: [phone]
340A
Issue Date: 18th June 2004
________________________________________________________________________
SERVICE MANUAL
________________________________________________________________________
SPECIFICATIONS:
Power Output 40W (into 8Ω)
50W(into4Ω)
Max Power Consumption 345W
Total Harmonic Distortion 1kHz < 0.009%
20kHz < 0.09%
Frequency Response (-1dB) 5Hz – 50kHz
S to N Ration (unweighted) 99dB
Slew Rate (into 8Ω) 20V/uS
Dimensions (HxWxD)
mm 70 x 430 x 310
Inches 2.8 x 16.9 x 12.2
Weight
Kg 6.2
Lbs 13.6
AP15844/1
1

340A SERVICE MANUAL
TABLE OF CONTENTS
Safety Precautions & Important Notes 3
Main Assembly BOM 4/5
Micro controller PCB Schematic (PIC’s/Switches/LED’s) 6
Micro controller PCB Layout (Top Side) 7
Micro controller PCB Layout (Bottom Side) 8
Front Panel PCB Assembly BOM 9
Main PCB Schematic (Input Select) 10
Main PCB Schematic (Power Amplifiers) 11
Main PCB Schematic (Power Supplies) 12
Main PCB Schematic (Tone Control) 13
Main PCB Layout (Top Side) 14
Main PCB Layout (Bottom Side) 15
Main PCB BOM 16-18
IC Pin Layout Details 19/20
Silver – Black Differences BOM 21
2

SAFETY PRECAUTIONS & IMPORTANT NOTES
1.Check that the rear of the product indicates the correct supply voltage
for you 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 of 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

AP14861/4
AP PART
No.
DRAWING NO DESCRIPTION QTY COMMENTS
Chassis Assembl
y
AP14160/1 Bottom Panel 1
PY541 AP12652/2 Foot Mouldin
g
Silver 4 Position In Place on Bottom Panel
PY544 AP12883/3 Foot Pad 4 Affix on Foot Usin
g
Adhesive Surface
M3 X 8 Plastite Pozi Pan 4 Fix Feet To Bottom Panel.
7mm Plastic Su
pp
ort 9 Push Sna
p
Fit On Bottom Panel
7mm Plastic Su
pp
ort 4 Restin
g
Under PCB fastened to Bottom Panel
AP14775/1 7mm Plastic Standoff ( S
q
uare Sna
p
- In) 6 Fastenin
g
PCB to Bottom Panel
M3 X 8 Plastite Pozi Pan 6 To hold PCB to S
q
uare sna
p
-in Stand-offs
AP14561/3 Transformer toroidal 230
V
1
Transformer bolt M8 56mm thread len
g
th 1 Su
pp
lied with Transformer. Secures transformer
Dished transformer
p
late 70 mm diam 1 Su
pp
lied with Transformer. On to
p
of transformer
Rubber Washer 2 Supplied with Transformer. One is fitted under the
transformer and one on the to
p
, under dished washe
r
M8 nut 1 Su
pp
lied with Transformer. Secures transformer
M8
p
lain washe
r
1Su
pp
lied with Transformer. Secures transformer
M8 lockin
g
washer 1 Su
pp
lied with Transformer. Secures transformer
AP15528/1 Cambrid
g
e Toroidal 67mm label 1 Stick to to
p
of dished transformer
p
late 70 mm diam.
AP14862/2 Insulation Sheet 1 To Be Positioned Over Standoffs Under Power PCB
M4 X 12 Pozi Pan Machine Bolt 1 Fix Throu
g
h Earthin
g
Point hole on Bottom Panel
M4 Nut Standard 1 Used To Fix Above Bolts
M4 Lock Washer 1 For Earth Bolts
Earth
p
oint label 1 Place next to earth
p
oint bolt on bottom of chassis
PCB Gerber AP1
4
Main PCB Assembly BOM 1 Fixes onto the Bottom Panel With 7mm Plastic Standoffs.
Built to BOM AP15173/2
Front Panel Assembl
y
AP14159/1 Sub Panel 1 Fasten in place between the Ledges of the Front Panel, Align
U
p
The Power Button Holes
AP12931/1 Li
g
ht
g
uide 3 Fasten To Sub
p
late. In
p
ut select LEDs
AP12931/1 Li
g
ht
g
uide (half of) 0.5 Fasten To Sub
p
late. Power LED
M3 X 6 Pozi Pan St
p
Screw 4 Affixes Three Li
g
ht
g
uide To Sub
p
late
PY638 AP14157/1 Front Panel (Punched And Printed) Silver 1 Extrusion Details AP12738* & Screened With Artwork
AP14826/1 & AP14828/2
AP12935/1 IR Lens 1 Glued In Place On The Front Panel
M3 X 6 C/S Pozi Machine Screw 7 Fasten The Sub Plate to the Front Panel. Only 7 screws are
fitted out of a
p
ossible 8. See drawin
g
AP15536/1
PCB Gerber AP1
4
IR PCB Assembly (part of F/P PCB assembly) 1 Fitted onto the Front Panel, bom is AP15185/2
W
asher N
y
lon M3, 1mm Thk 1 Fitted between Front Panel and IR PCB
M2.6 x 4mm Pan hd Poz Ta
p
tite 1 Use to fix IR PCB onto SubPanel
AP12934/1 7mm TAC Switch Cushion 6 Position on the 7mm tact switch Buttons, down the main
shaft affix usin
g
adhesive
p
rovided on the cushion.
AP12925/1 7mm TAC Switch Button 6 Position In Place On The Front Panel
AP12926/2 7mm Push Switch Button 2 Fitted to SW1 & 2 on main PCB
PCB Gerber AP1
4
Front Panel & MicroController PCB Assembly
BOM
1 Fixes onto the Sub Panel With M3 M/C Screws. Built to BOM
AP 15185/2
M3 X 6 Pozi Pan Machine Screw 7 Used For Fixing The Front Panel Pcb's To The Subplate
Standoff's
Side Panel Assembl
y
AP12725/2 Pressed Side Panel (2 Rid
g
e) 2
AP12727/1 Front Plastic Support (2 Ridge With Captive
M2.6 Nuts
)
2 Position at Front within Side Panels
AP12728/1 Rear Plastic Support (2 Ridge With Captive M2.6
Nuts
)
2 Position at Rear within Side Panels
M2.6 X 8 C/S Pozi Plastite 8 To Affix Side Panels To Plastic Inserts
Rear Panel Assembl
y
AP14162/2 Rear Panel Printed 1 Screened With Artwork AP14830/3
M3 X 10 Pozi Pan Plastite 8 To fix speaker terminal and Phono sockets connectors to
Rear Panel
M4 X 8 Pozi Pan Plastite 2 To fix IEC Power connector to Rear Panel
Cambridge Azur 340A Main Assembly BOM
4

AP PART
No.
DRAWING NO DESCRIPTION QTY COMMENTS
Final assembl
y
AP11879/3 O
p
us Control Box Powerswitch 1 Position in Place on the Front Panel
AP14819/1 Push Switch Bar Extension 1 Affix and
g
lue to Power Bar
CD4P AB05a Power Bar 1 Fitted to SW3 on main PCB
AP15512/1 Front Panel Insulation Sheet 1 Attach to main PCB with two tie-wra
p
s
Tie-wra
p
s (
p
lastic ties) Width 2.5mm 2 Attach insulation stri
p
to main PCB
PY592 AP10209/3 Cambrid
g
e Selector Knob Mk3 Silver 3
AP10224/1 Cambrid
g
e Knob Insert Mk2 3 Insert Into Selector Knobs
PY590 AP12750/2 Cambridge New Range Amp Volume Knob Silver 1
AP13361/1 A600 Volume Knob Blue Plastic Insert 1 Insert Into Volume Knob
AP13360/1 A600 Volume Knob Aluminium Skin 1 Glued and ta
p
ed In Place On Volume Knob
M3 X 10 Pozi Pan Plastite 4 To fix rear
p
anel to side
p
anels
M2.6 X 6 Pozi Pan Machine Screw 12 To fix Bottom Panel To Side, Front And Rear Panels
M2.6 x ??? 4 To fix Bottom Panel To Side Panels (at corners)
AP14865/1 Cambridge Azur 340A Microcontroller
Cableform
1 From Main PCB J2 to Front Panel PCB CN2
AP14896/1 Cambridge Azur 340A Volume Control
Cableform
1 From Front Panel PCB CN5 to Volume Pot Motor
AP15204/1 Cambridge Azur 340A Earth Lead 1 From earth pin of IEC Scoket (CN3) on main PCB to Chassis
earth stud
M4 Nut Standard 1 Used To Fix earth lead to earth stud
M4 Lock Washer 1 For above nut
LED wireform is attached to main PCB Glue
p
ower LED into li
g
ht-
g
uide
Liddin
g
AP13340/1 Liddin
g
Ta
p
e For Front And Rear Panels 2 Fix To The Correct Surfaces For Lid
AP13342/1 Liddin
g
Ta
p
e For Side Panels 2 Fix To The Correct Surfaces For Lid
PY640 AP14161/1 340A To
p
Panel (Silver) 1 Position To
p
Of The Product
PY516 M2.6 X 6 C/S Torx Machine Screw (Silver) 8 To Affix Top Panel to plastic Inserts, Side, Rear and Front
Panel
Packa
g
in
g
Serial Number Label, Blank (6.5X35.5mm) 1 print with serial number label and attached to rear panel
AP13612/1 Azur 2 Rid
g
e Woven Ba
g
1 Pack 340A Unit Inside
AP13504/2 Pol
y
Endca
p
Packa
g
in
g
2
AP13613/1 Azur Woven Ba
g
For Remote Control 1 Pack Remote Control Inside,
Azur Remote Control Complete. Model No RC-
340AC/540AC/640AC
1 Fit into Poly Endcap, buttons to face polystyrene, Packing in
Rebate Provided
AAA Alkaline Batteries 3 For Remote. Place In Instruction Manual Pol
y
ba
g
PY637 AP15509/1 340A Am
p
Instruction Manual 1
Pol
y
ba
g
173X260X4C mm 1 For Instruction Manual and Remote Batterie
s
1830mm AC IEC Power Cord Set BS Standard
Fused 3 AMP
1 Must Be Bs Approved
AP13505/1 Carton Packa
g
in
g
With Handle 1 Printed To Artwork AP13716/1
AP14696/1 Carton Label (Model No.) 1 For Bo
x
Blue Ta
p
e Seal For Cambrid
g
e Carton 1
NOTES: Issue 1 - 15.03.2004
Issue 2 - 23.04.2004
5

Cambridge Azur 340A Intergrated Amplifier
AP14518/1 Microcontroller PCB Schematic (PIC's/Switches/LED's)
RC6 17
RC5 16
RC4 15 RC3
14 RC2
13 RC1
12 RC0
11 OSC2
10
RA0
2
RA2
4
MCLR/Vpp
1
RA1
3
RA3
5
RB1 22
RB7 28
RA4
6
RA5
7
Vss2
8
OSC1
9
RB2 23
RB3 24
RB6 27
RB4 25
RB5 26
Vss 19
RC7 18
Vdd 20
RB0 21
U1
PIC16F72
CRS1
FREQ=4MHz
1
2
CN5
H2 2.54mm 90
C6
100n
FIN 1
GND1 2
RIN 3
NC 4
GND2 5
VCC 6
OUT2 7
COM 8
OUT1 9
U2
BA6218
+5V
DGND
DGND
DGND
+5V
DGND
C5
100n
R4
220R
+5V
D1
CHANNEL LED
D2
CHANNEL LED
D3
CHANNEL LED
D4
CHANNEL LED
D5
CHANNEL LED
D6
CHANNEL LED
SW2
CD
SW3
TUNER/DAB
SW5
AV/MD
SW1
AUX/PHONO
SW6
TAPE MON
SW4
DVD
+5V
3
OPT
1GND
2
U3
TSOP18 IR RECEI
C1
100n
strobe
data
clockclock
data
strobe
vol up
vol down
vol up
vol down
C3
47u 16V
R3
220R
C4
100n
1
2
3
4
5
6
7
8
CN2
H8 2.54mm 90
DGND
+5V
IR RECEIVER
AUX/PHONO CD TUNER/DAB TAPE MON DVD AV/MD
1
2
3
CN3
CONN-H3
1
2
3
CN4
CONN-H3
MOTOR CONTROL
CONN TO MAIN PCB
MUTE
+5V
DGND
PORT B HAS WEAK PULLUPS 250uA typ
IN-CIRCUIT PROGRAMMING CONNECTOR
R1
100K
+5V
DGND
+5V
GND
Vpp
CLK
1
2
3
4
5
6
CN1
ICP
GND
Data I/O
DGND
MUTE
TO MOTOR
VOLUME POT
+5V +5V
OUTPUT RELAY
IR IN
DC OFFSET
OUTPUT RELAY
R2
47R
HI = NORMAL
C2
10U 16V SM EL
TSOP1835/37
6 mA
86-756-8687998
To enhance viewing, please print to A3 6

Cambridge Azur 340A Intergrated Amplifier
AP14518/1 Microcontroller PCB Board Layout (Top Side)
86-756-8687998
To enhance viewing, please print to A3 7

Cambridge Azur 340A Intergrated Amplifier
AP14518/1 Micrcontroller PCB Board Layout (Bottom Side)
86-756-8687998
To enhance viewing, please print to A3 8

AP15185/3
AP PART
No.
DRAWING No DESCRIPTION QTY DESIGNATOR COMMENTS
47R Resistor 0.25W 1% metal film 1 R2
220R Resistor 0.25W 1% metal film 2 R3, R4
100K Resistor 0.25W 1% metal film 1 R1
100nF Ceramic NP0 or C0G 10% 4 C1, C4-C6
47uF 16V Radial Electrol
y
tic 1 C3
PY634 PIC16F72-I/SP 1 U1 Pro
g
rammed with AP14904/X
Version label for PIC 1 U1 Print with latest software version
number and stick on PIC.
PY260 BA6218 MOTOR DRIVE IC 1U2 As used in 540A. 4162-180002-300
SIL-8
p
acka
g
e
PD092 TSOP18 IR RECEIVER MODULE (VISHAY) 1 U3 As used in 540A 3001-183600-001
PY064 FLAT TOP BLUE LEDS (AS PER CURRENT
CAMBRIDGE
)
6 D1-D6 Please use flat top LED at standard
Azur hei
g
ht
ICP Pico
p
lex PF-50 6-wa
y
male header 1 CN1 Vertical
H8 2.54mm 90 1 CN2 Ri
g
ht-an
g
le connector 8-wa
y
H2 2.54mm 90 1 CN5 Ri
g
ht-an
g
le connector 2-wa
y
H3 2.54mm 90 1 CN3 Ri
g
ht-an
g
le connector 3-wa
y
AP14897/1 Azur 340A IR PCB cable 1
2400-020200-000 Tactile Switch 6 SW1, 2, 3, 4, 5, 6 As used on 540A, CD, Tuner, AV,
Phono/Aux, Ta
p
e/Mon, DVD
Ceramic Resonator F=4MHz 1 CRS1
10mm lon
g
W
ire link 11 LK1-11
AP14519/1 Blank PCB 1
Note:
AP14518/1-B is the IR PCB assembl
y
Cambridge Azur 340A Front Panel PCB BOM
AP14518/1-A is the switch and micro controller PCB assembly
9

Cambridge Azur 340A Intergrated Amplifier
AP14476/3 Main PCB Schematic (Input Select)
2
1
CN4:A QUAD PHONO
3
CN4:B QUAD PHONO
5
4
CN4:C QUAD PHONO
6
CN4:D QUAD PHONO
2
1
CN5:A QUAD PHONO
3
CN5:B QUAD PHONO
5
4
CN5:C QUAD PHONO
6
CN5:D QUAD PHONO
2
1
CN8:A QUAD PHONO
3
CN8:B QUAD PHONO
5
4
CN8:C QUAD PHONO
6
CN8:D QUAD PHONO
3
2
1
84
U1:A
NE5532
5
6
7
U1:B
NE5532
-15V
+15V
-15V +15V
R5
220K
R6
220K
R7
100R
R10
100R
R14
100R
R15
220K
R16
220K
R17
100R
R18
1K
R19
100R
R21
220K
R22
220K
R23
220K
R24
100R
R25
100R
R26
100R
R27
100R
R28
100R
R29
1K
R30
220K
R31
220K
C4
47n poly
C5
47n poly
C7
47n poly
C8
47n poly
C12
22p
C13
22p
R32
220K
R33
10k
R34
10k
R35
10k
R36
10k
R37
100K
R38
100K
R39
100K
R40
100K
R41
100R
R46
100R
R47
100R
C26
100nF 100V
L CH IN
R CH IN
R50
220K
R51
220K
2
1
CN9:A
DUAL PHONO
3
CN9:B
DUAL PHONO
LEFT RIGHT
TAPE RETURN RIGHT
TAPE RETURN LEFT
1
2
3
4
5
6
7
8
J2
H8 2.54mm 90
+5V
INPUT/TAPE SELECT SWITCH
MUTE
MICROCONTROLLER
BOARD CONNECTOR
OUTPUT RELAY
DC OFFSET
DATA
CLOCK
STROBE
23 56
AB CD
LRLR
TAPE OUT R
AUX R
CD
TUNER/DAB
DVD
AV/MD
AUX L
CD
TAPE OUT L
TUNER/DAB
DVD
AV/MD
BTBT
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
U4
TC9163
INPUT BUFFER
+ 6 dB
MAINS GND
C14
10U 16V
C25
10U 16V
86-756-8687998
To enhance viewing, please print to A3 10

Cambridge Azur 340A Intergrated Amplifier
AP14476/3 Main PCB Schematic (Power Amplifiers)
R8
1K
+
10
-
9
OUT 3
V-
4
GND
7
MUTE
8
V+
1
V+2
5
NC2
6
NC
2
NC3
11
U6
LM3886
C2
100nF 100V
L1
+28V
-28V
R9
27K
R48
RES2W 2R2
R56
RES2W 10R
R57
27K
R58
22K
C3
10U 16V
C22
47U 16V
C23
100U 16V NO FIT
POWER AMPLIFIER LEFT
R65
1K
+
10
-
9
OUT 3
V-
4
GND
7
MUTE
8
V+
1
V+2
5
NC2
6
NC
2
NC3
11
U7
LM3886
C36
100nF 100V
L2
+28V
-28V
R66
27K
R67
RES2W 2R2
R68
RES2W 10R
R69
27K
R70
22K
C37
10U 16V
C38
47U 16V
C39
100U 16V NO FIT
POWER AMPLIFIER RIGHT
POWER AMP LEFT
POWER AMP RIGHT
C40
100U 50V HR
C41
100U 50V HR
C42
100U 50V HR
C43
100U 50V HR
MUTE
R71
47K
Q1
BC327
+5V
R72
47K
R73
47K
R74
47K
Q2
BC337
AMP MUTE
AMP MUTE
-28V
HI = MUTE
SW2:A
SW-DPDT
SW2:B
SW-DPDT
SPEAKER B ON/OFF
RSW1
RSW2
R
L
GND
LSW1
LSW2
2
4
3
1
7
8
5
CN1
HEADPHONE JACK
R61
220R 3W C
R62
470R 1W C
R63
220R 3W C
R64
470R 1W C
1
2
CN2:A
SPKR 4-WAY
4
3
CN2:B
SPKR 4-WAY
5
6
CN2:C
SPKR 4-WAY
8
7
CN2:D
SPKR 4-WAY
LEFT: SPEAKER A
LEFT: SPEAKER B
RIGHT
RIGHT
3
4
5
RL1:B
12V 8A RELAY
6
7
8
RL1:C
12V 8A RELAY
1
2
RL1:A
12V 8A RELAY
360R
Q3
BC337
D9
1N4001
R75
220R
1/2 W
+20V
R76
4K7
OUTPUT RELAY
R77
47K
R78
47K
SPEAKER A
SPEAKER B
Q4
BC327
Q5
BC337
D10
1N4148
D11
1N4148
R79
1K8
R80
3K3
D12
1N4148
D13
1N4148
D14
1N4148
D15
1N4148
-15V
+15V
DC OFFSET
R12
3K9
R13
2K2
D16
5V1
HI = NORMAL
C54
22U 50V NP
C55
22U 50V NP
DC OFFSET DETECT
40W 8 Ohms
= 17.9 Vrms
R53
270K
R55
270K
R81
470R
R82
470R
TIP = LEFT
RING = RIGHT
86-756-8687998
To enhance viewing, please print to A3 11

Cambridge Azur 340A Intergrated Amplifier
AP14476/3 Main PCB Schematic (Power Supplies)
earth
C24
6800uF-50V
C27
6800uF-50V
+28V
-28V
D1
1N5402
D2
1N5402
D3
1N5402
D4
1N5402
F1
T6A3 AL
LVD!
F2
T6A3 AL
LVD!
0V
23V
23V
F3
20MM T6.3AL or 3.15AL
TO MAINS TRANSFORMER
J5
BLUE/WHITE
J6
BROWN/BLACK
L
N
E
CN3
IEC-SOC
C34
X1 10n
C35
X1 10n
C44
X2 470N SUPPRESSION
FROM TRANSFORMER
F4
20MM T1AL
F5
20MM T1AL
12 SW3
KDC-A04-10
D5
1N4002
D6
1N4002
D7
1N4002
D8
1N4002
J7
TERMINAL
green
J9
TERMINAL
purple
J10
TERMINAL
blue
C45
1000u 35V
C46
470u 35V
VI
1VO 3
GND
2
U5
7805
C47
47u 16V
C48
47n poly
VI
1VO 3
GND
2
U8
7815
VI
2VO 3
GND
1
U9
7915
C49
100u 25V
C50
100u 25V
+5V
C51
47n poly
C52
47n poly
C53
47n poly
+15V
-15V
FROM TRANSFORMER
+20V
J3
TERMINAL
J4
TERMINAL
J8
TERMINAL
MAINS SWITCH PCB
OPAMP SUPPLY
MICROCONTROLLER SUPPLY
POWER AMP SUPPLY
C28
X2 470N SUPPRESSION
ALTERNATIVE POSITIONS FOR
X-CAPS WITH DIFFERENT LEAD PITCHES
MAINS GND
To sheet 1
R49
1K8
P1
PAD
P2
PAD
POWER LED
86-756-8687998
To enhance viewing, please print to A3 12

Cambridge Azur 340A Intergrated Amplifier
AP14476/3 Main PCB Schematic (Tone Control)
C1
330p poly
R1
22k
R2
4k7
R3
4k7
R4
8k2
R11
8k2
C6
150n poly
C9
10p
SW1:A
SW-DPDT
DEFEAT
-15V
+15V
C10
330p poly
R20
22k
R42
4k7
R43
4k7
R44
8k2
R45
8k2
C11
150n poly
C15
10p
SW1:B
SW-DPDT
DEFEAT
C16
47n poly
C17
47n poly
3
2
1
84
U2:A
NE5532
5
6
7
U2:B
NE5532
R CH IN
L CH IN
POWER AMP RIGHT
POWER AMP LEFT
R52
150k
R54
150k
R59
150k
R60
150k
1 3
2
VR1:A
20K MOTORISED DUAL POT
4 6
5
VR1:B
20K MOTORISED DUAL POT
4 6
5
VR4:B
MN20K BALANCE
13
2
VR4:A
MN20K BALANCE
13
2
VR2:A
B20K LINEAR
46
5
VR2:B
B20K LINEAR
13
2
VR3:A
B20K LINEAR
46
5
VR3:B
B20K LINEAR
ZERO LOSS
WHEN CENTRAL
TONE CONTROL VOLUME/BALANCE CONTROL
TREBLE
BASS
TREBLE
BASS
C19
47u 16V
C20
47u 16V
C29
47u 16V
C32
47u 16V
86-756-8687998
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Cambridge Azur 340A Intergrated Amplifier
AP14476/4 Main PCB Board Layout (Top Side)
86-756-8687998
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Cambridge Azur 340A Intergrated Amplifier
AP14476/4 Main PCB Board Layout (Bottom Side)
86-756-8687998
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AP151734
AP PART
No.
DRAWING NO DESCRIPTION QTY DESIGNATOR NOTES
2R2 2W Metal Film 2 R48, R67 Stand off PCB by 5mm
10R 2W Metal Film 2 R56, R68 Stand off PCB by 5mm
100R 0.25 W 1% Metal Film 13 R7, R10, R14, R17, R19,
R24-R28, R41, R46, R47
220R 0.5 W Metal Film 1 R75
220R 3W Metal Film 2 R61, R63 Stand off PCB by 5mm
470R 0.25 W 1% Metal Film 2 R81, R82
470R 1W Metal Film 2 R62, R64 Stand off PCB by 5mm
1K 0.25 W 1% Metal Film 4 R8, R18, R29, R65
1K8 0.25 W 1% Metal Film 2 R49, R79
2K2 0.25 W 1% Metal Film 1 R13
3K3 0.25 W 1% Metal Film 1 R80
3K9 0.25 W 1% Metal Film 1 R12
4k7 0.25 W 1% Metal Film 5 R2, R3, R42, R43, R76
8k2 0.25 W 1% Metal Film 4 R4, R11, R44, R45
10k 0.25 W 1% Metal Film 4 R33-R36
22k 0.25 W 1% Metal Film 4 R1, R20, R58, R70
27K 0.25 W 1% Metal Film 4 R9, R57, R66, R69
47K 0.25 W 1% Metal Film 6 R71-R74, R77, R78
100K 0.25 W 1% Metal Film 4 R37-R40
150k 0.25 W 1% Metal Film 4 R52, R54, R59, R60
220K 0.25 W 1% Metal Film 12 R5, R6, R15, R16, R21-R23,
R30-R32, R50, R51
270K 0.25 W 1% Metal Film 2 R53, R55
22pF Ceramic NPO. Pitch= 3.0mm 2 C12, C13
10pF Ceramic NPO. Pitch= 3.0mm 2 C9, C15
330pF Polyester. Pitch= 5.0mm 2 C1, C10
10nF X1 Mains rated Ceramic. Pitch=
5.0mm
2 C34, C35 EMC Suppression
47nF Polyester Pitch= 5.0mm 10 C4, C5, C7, C8, C16, C17,
C48, C51-C53
100nF Ceramic 100V Pitch= 5.0mm 3 C2, C26, C36
150nF Polyester Pitch= 5.0mm 2 C6, C11
470nF X2 Mains rated Polypropylene.
Pitch 22.5mm
1 C28 EMC. C44 is alternative fit for 27.5 mm
p
itch
10uF Electrolytic 16V Pitch= 2.0mm 4 C3, C14, C25, C37
22uF Electrolytic 50V NP Pitch= 2.0mm 2 C54, C55
47uF Electrolytic 16V Pitch= 2.5mm 6 C19, C20, C22, C29, C32,
C38, C47
100uF Electrolytic 50V HR Pitch= 5.0mm 4 C40-C43
100uF Electrolytic 25V Pitch= 2.5mm 2 C49, C50
470uF Electrolytic 35V Pitch= 5.0mm 1 C46
1000uF Electrolytic 35V Pitch= 5.0mm 1 C45
6800uF Cambridge Audio Branded
Electrolytic 50V Pitch= 10.0mm
2 C24, C27 Glue both capacitors to PCB
PY259 NE5532 Dual Low Noise Operational
Am
p
lifier
2 U1,U2 DIL package
PY476 TC9163AF Input Switching 1 U4 surface mount package
7805T Voltage Regulator +5V 1 U5 TO220 package
PY644 LM3886T High Performance Audio Power
Am
p
lifier
2 U6,U7
7815T Voltage Regulator +15V 1 U8 TO220 package
7915T Voltage Regulator -15V 1 U9 TO220 package
PY219 BC327 PNP Small Signal 2 Q1, Q4
PY214 BC337 NPN Small Signal 3 Q2, Q3, Q5
Cambridge Azur 340A Main PCB BOM
16

AP PART
No.
DRAWING NO DESCRIPTION QTY DESIGNATOR NOTES
1N5402 General Purpose Rectifier 4 D1-D4
1N4002 General Purpose Rectifier 4 D5-D8
1N4001 General Purpose Rectifier 1 D9
1N4148 High Speed Signal 6 D10-D15
BZX85-C5V1 Zener 400mW 1 D16
PY649 T6.3AL 6.3A time delay Fuse-20mm low
breakin
g
ca
p
acit
y
2 F1, F2 Secondary fuses
PY595 T3.15AL 3.15A time delay Fuse-20mm low
breakin
g
ca
p
acit
y
1 F3 230V mains fuse
PY647 T1AL 1A time delay Fuse-20mm low
breakin
g
ca
p
acit
y
2 F4, F5 Secondary fuses
4031-050100-001 Fuseholder 20mm 5 F1, 2, 3, 4, 5
4034-000030-000 Fuseholder cover 1 F3 Place on mains fuse holder F3
H8 2.54mm CONN-SIL8 1 J2 Vertical connector
BLUE/WHITE eyelet 1 J5 Terminate txfmr mains lead
BROWN/BLACK eyelet 1 J6 Terminate txfmr mains lead
25X7MM
INDUCTOR
3203-874801-000 2 L1, L2 As 540A amplifier
PY594 12V coil, 8A
250VACMassuse Me-
11 012-2Z4
Relay-s 1 RL1
PY004 20K MOTORISED
DUAL POT
Pot-Dual-Motor 1 VR1 As 540A amplifier. IMPORTANT leads
must be cro
pp
ed close to PCB
PY003 B20K LINEAR Pot-Dual 2 VR2, VR3 As 540A amplifier. IMPORTANT leads
must be cro
pp
ed close to PCB
PY005 MN20K BALANCE Pot-Dual 1 VR4 As 540A amplifier. IMPORTANT leads
must be cro
pp
ed close to PCB
M3 x 10 Taptite Power Amp IC Fix Screw 2 Fix IC tab to heatsink
M3 Power Amp IC Insulating Bush 2 Insulate fix screw from IC tab
Precut washer type
K177-NA-617
Power Amp IC Insulating Washer 2 K177 is the material type. NA means "no
adhesive". Self-adhesive version would
be technicall
y
acce
p
table.
Dwg no: AP14899/1 Power Amp Heatsinks 2 Black anodised
6510-150310-000
(
Pressure board
)
Power Amp IC Bracket 2 Holds IC body against heatsink
M3 x 6 Taptite Power Amp IC Bracket Fix Screws 4 Fix bracket to heatsink
Screw M3.5x10mm
BTB thread, Binding
Head, cross recess,
black
p
lated
Heatsink Fixing Screws 4 7003-510003-111
Metal Washer
OD=10mm
ID=3.5mm
Thk=0.8mm
Heatsink Fixing Washers 4 7103-610008-022
M4 x 12 machine
screw
IEC socket fix screws 2 Fix IEC socket to PCB
M4 locking washer IEC socket fixing 2 Fix IEC socket to PCB
M4 nut IEC socket fixing 2 Fix IEC socket to PCB
AP15508/1 Power LED wireform 1 Solder to pads P1, P2
10mm long Wire link 37 LK11-22, LK29-37, LK39-
56
25mm long Wire link 19 LK 1-10, LK 23-28, LK36-
38
PY646 2330-005901-300 Headphone Jack 1 CN1 As 540A amplifier
PY647 WP8-21A Spkr 4-Way 1 CN2 Note: red terminals at top. Modified
mechanicall
y
as
p
er our instructions.
PY226 2336-003910-002 IEC-Socket 1 CN3 As 540A amplifier
PY036 2330-006911-021 Quad Phono 3 CN4, CN5, CN8 As 540A amplifier, Zuanbao AV4-8.4-9
PY035 AV2-8.4-9 Dual Phono 1 CN9
17

AP PART
No.
DRAWING NO DESCRIPTION QTY DESIGNATOR NOTES
PY645 2402-020200-010 SW-DPDT 2 SW1, SW2 As 540A amplifier
PY227 KDC-A04-10 Mains switch 10A 250V TV-8 1 SW3 mains switch
Gerber AP14477/4 1 Schematic AP14476/4
Gerber file is AP14477/4
PCB Construction details
AP14478/4
Please mark board POP REV A
NOTES:
Note 4: All capacitors 85 degC rating or above
Note 1: C23, C39 Components not fitted
Note 2: All resistors larger than 0.25W to be stood off the board by 5mm
Note 3: All resistors 1% tolerance
18

Cambridge Audio Azur 340A Amplifier IC Pin
Layout Details
Front Panel PCB
PIC16F72-I/SP (U1)
BA6218 (U2)
TSOP1836/37 (U3)
19

Main PCB
NE5532 (U1 & U2)
TC9163AF (U4)
LM3886T (U6 & U7)
20