Cambridge Audio Azur 840-A Service manual
840A
Issue Date: 16th June 2006
________________________________________________________________________________
SERVICE MANUAL
________________________________________________________________________________
SPECIFICATIONS:
Power Output 120W RMS into 8 Ohms
200W RMS into 4 Ohms
THD (unweighted) < 0.0015% 1 kHz
at 80% of rated power
< 0.015% 20Hz – 20kHz
at 80% of rated power
Frequency Response 10Hz – 50kHz +/- 1dB
S/N ratio (ref 1W/8 Ohm) >83dB
Input Impedances Input 1 (balanced) 10 kOhm
Inputs 2-7 68 kOhm
Tape Input 68 kOhm
Power Amp damping factor > 110 at 1kHz
Max power consumption 800W
Minimum power consumption Active (no signal) 70W
Standby 7W
Bass & Treble controls Shelving type
Max bass boost/cut +/- 10dB at 10Hz
Max treble boost/cut +/- 7.5dB at 20Hz
Dimensions (H x W x D) 115 x 430 x 385mm
(4.5 x 16.9 x 15.2”)
Weight 15.0kg (33Lbs)
Gallery Court Hankey Place London SE1 4BB UK
Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233
AP19597/1
1
840A SERVICE MANUAL
TABLE OF CONTENTS
Safety Precautions & Important Notes 4
Block Diagram
Exploded Diagram
Exploded Diagram Parts List
Front Panel PCB Schematic (Microcontroller & LCD)
Front Panel PCB Schematic (Shift Registers)
Front Panel PCB Layout (Top Side)
Front Panel PCB Layout (Bottom Side)
Front Panel PCB BOM
Input PCB Schematic (Input Select)
Input PCB Schematic (Input Control)
Input PCB Schematic (Input Amplifier)
Input PCB Board Layout (Top Side)
Input PCB Board Layout (Bottom Side)
Input PCB BOM
Preamp PCB Schematic (Relay Logic)
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Preamp PCB Schematic (Tone Control)
Preamp PCB Schematic (Post Amp)
Preamp PCB Board Layout (Top Side)
Preamp PCB Board Layout (Bottom Side)
Preamp PCB BOM
Power Amplifier Schematic (Right Power Supplies & PSU)
Power Amplifier Schematic (Right Channel)
Power Amp Right & PSU PCB Board Layout (Top Side)
Power Amp Right & PSU PCB Board Layout (Bottom Side)
Power Amp Right PCB BOM
Power Amp PSU PCB BOM
Power Amp Schematic (Left Channel)
Power Amp Schematic (Left Power Supplies)
Power Amp PCB Board Layout (Top Side)
Power Amp PCB Board Layout (Bottom Side)
20
21
22
23
24-25
26
27
28
29
30-31
32
33
34
35
36
Power Amp Left PCB BOM
Hub PCB Schematic
37-38
39
2
Hub PCB Board Layout (Top Side) 40
Hub PCB Board Layout (Bottom Side)
Hub PCB BOM
Rectifier PCB Schematic
Rectifier PCB Board Layout (Top Side)
Rectifier PCB Board Layout (Bottom Side)
Rectifier PCB BOM
IC Pin Layout Details
Technical Description
Procedure to upgrade the Control (Pic) Software
Notes
41
42-43
44
45
46
47
48-49
51-60
61-62
63
3
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.
© 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.
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.
4
Cambridge Audio Azur 840A Amplifier
To enhance viewing, please print to A3 5
840A Block Diagram
Cambridge Audio Azur 840A Amplifier
12
16
17
6
15
2
9
10
1
3
15
11
6
8
5
7
4
To enhance viewing, please print to A3 6
840A Exploded Diagram
18
5
14
13
0
C
0
B
0
B
k
r
0
A
*
A
*
A
2
A
r
7
A
A
r
A
y
A
y
A
)
A
)
0
A
0
A
A
0
A
0
A
E
A
A
A
A
A
A
A
A
A
A
A
A
A
A
7
A
A
7
A
A
A
A
7
noitpircseD:feRyrotcaF
zur 840A Plastic Foot (Black) AP16837
zur 840A Plasitc Foot (Silver) AP16837
zur 840A Top Panel Silve
zur 840A Side Panel, Black Painted
Toroid 230V/50Hz 36.5VACx4 5.5A TI-053044
Toroid 115V/50Hz 36.5VAC 5.5A TI-0853045C for 840A
Toroid 115V/50Hz 7.5VAC750MA 17VAC*2 ST
zur 840A Top Panel Black Painted
zur 840A Side Panel,Silve
zur-840A Silver Front Panel Ass
zur 840A Black Front Panel Ass
zur 840A Volume Knob Plastic Insert (AP1743*)
zur 840-A Silver Front Panel Artwork AP186371/186381 (Metalwork Only
zur 840-A B Front Panel Artwork AP186371/186381 (Metalwork Only
zur 840A Volume Knob Skin, Silver
zur 840A Volume Knob Skin, Black
LCD Display Highly Transflective DC00003E02 840
zur 840A Display Backlight (AP16841*)
zur-840A AMP-Hub Control PCB Assy Rev
zur-840A Main-Amp Left PCB Assy Rev
zur-840A Pre-Amp Board Rev
zur-840A Amp-Rectifier PCB Rev
zur-840A Amp Front Control PCB Assy Rev
zur-840A Amp Input PCB Assy Rev
zur-840A EU/UK PSU Power Control PCB Assy Rev
zur-840A Main-Amp Right PCB Assy Rev
zur-840A LCD Display Board Assy Rev
zur-840A Remote Control Assy Rev
Exploded Diagram Parts List
Cambridge Audio Azur 840A Amplifier
6574-150013E000-01
AP Part
Number
1 PY1118 2331-004909E301 Speaker Binding Post BP331 (Black) Red & Black
2 PY1019 3200-053044E00
Ref:
3 PY1120 3200-077811E00
4 PY1121 6074-150003E000-01 840A Bass / Treble Knob (Black) Painted Blac
3 PY1119 3200-074051E001 Toroid 230V/50Hz 7.5VAC750MA 17VAC*2 TO7405B ST
2 PY1020 3200-053045E00
4 PY1123 6074-150003E001A01 840A Bass / Treble Knob (Silver) Painted Silve
Drawing
PY1125 6574-150009E000-01
PY1126 6574-150009E000-0
5 PY1122 6074-150004E00
5 PY1124 6074-150004E000A01
6 PY1128 6574-150013E000A01
6 PY112
7 PY1130
7 PY1129 8584-015010E301
8 PY1131 6574-150012E000-01
6574-150015E00
PY1133 6074-150005E00
8 PY1132
9484-015000E111
PY1138 2409-010200E001 Rotary Encoder Switch REBG161(9*7)PVB20FHINB1-2-24
PY1135 3110-840000E00
PY1136 6600-990112E00
9 PY1139 9484-015000E041
10 PY1159 9484-015000E341
11 PY1153 9484-015000E141
13 PY1163 9484-015001E091
12 PY1146 9484-015000E091
14 PY1155 9484-015000E331
PY1134 9484-015000E061
15 PY1145 9484-015000E071
18 PY1165 9805-084000E001
16 PY113
1
All spare parts should be ordered from AP Hong Kong office
RS232 RX
R9
22K
RS232 RX
12
CN2
1a
2a
3a
4a
5a
6a
7a
8a
15 16
CONN-8 DUAL BOT
LCD DISPLAY CONN
LED BACKLIGHT POWER
2
Vss 1
Vdd 2
1
Vo 3
LCD CONN ORIENTATION FROM FRONT
RS 4
R/W 5
E 6
D0 7
D1 8
D2 9
D3 10
D4 11
D5 12
D6 13
D7 14
LED A 15
LED K 16
D3
1N4002
LOGIC GND
1
2
3
4
5
6
7
8
LOGIC GND
Q3
BC337
+5V
16
15
+5V
R11
10K
SERIAL RX 232
C2
100nF
VDD=+5V
VSS=LOGIC GND
+15V
R12
2K2
Q4
BC337
LOGIC GND
R5
C20
100R
100nF
LOGIC GND
C4
10U 16V
LCD DECOUPLE
LOGIC GND
LCD DATA SHIFT REGISTER
14
13
12
11
10
74HC4094
4
5
6
7
9
D
Q0
CLK
Q1
STB
Q2
OE
Q3
Q4
Q5
Q6
Q7
QS
QS
BC327-25
Q8
R2
43R
PRESET 20K 3296W
R1
22R
Q1
BC327-25
RS232 TX
R13
22K
+5V
C7
100nF
LOGIC GND
SHIFT REG DECOUPLE
2
SERIAL DATA
3
SERIAL CLOCK
1
15
R15
10K
U2
LOGIC GND
2
3
CW
SERIAL TX 232
RS232 TX
RS
E
SHIFT REG ENABLE
+5V
SERIAL IN FROM A-BUS HUB BOARD
R7
2K2
R3
1
2K2
CCW
PR1
CW
10U 16V
R6
1K1
D8
BZX79C2V7 500MW
1K1
R8
Cambridge Audio Azur 840A Amplifier
COL 1 COL 2 COL 3 COL 4
SW1
SW-TACT
INPUT 1 INPUT 2 INPUT 3 INPUT 4
SW5
SW-TACT
INPUT 5 INPUT 6 INPUT 7 TAPE MON
SW9
SW-TACT
MODE
SW2
SW-TACT
SW6
SW-TACT
SW10
SW-TACT
ON/STBY
SPEAKER TEST
SHIFT REG ENABLE
C5
22pF
22pF
IR CONTROL
D4
1N4148
Q2
BC337
X1
CRYSTAL
FREQ=20MHz
BLOCK
PIC TX
HUB DATA
HUB CLOCK
D5
1N4148
D6
1N4148
C6
LOGIC GND
C24
+5V
R14
10K
R4
4K7
SW3
SW-TACT
SW7
SW-TACT
SW11
SW-TACT
SPEAKER SELECT
U1
1
MCLR/VPP
2
RA0/AN0
3
RA1/AN1
4
RA2/AN2
5
RA3/AN3/VREF
6
RA4/T0CKI
7
RA5/AN4/SS
8
RE0/RD/AN5
9
RE1/WR/AN6
10
RE2/CS/AN7
11
VDD
12
VSS
13
OSC1/CLKIN
14
OSC2/CLKOUT
15
RCO/T1OSO/T1CKI
16
RC1/T1OSI/CCP2
17
RC2/CCP1
18
RC3/SCK/SCL
19
RD0/PSP0
20
RD1/PSP1
PIC16F877A
PORT B HAS WEAK PULLUPS
RB4-RB7 HAS INTRPT ON CHANGE
D7
1N4148
BC337
Q5
SW4
SW-TACT
SW8
SW-TACT
POSITION FOR
EXTRA SWITCH
spare
RB7/PGD
40
RB6/PGC
39
RB5
38
RB4
37
RB3/PGM
36
RB2
35
RB1
34
RB0/INT
33
VDD
32
VSS
31
RD7/PSP7
30
RD6/PSP6
29
RD5/PSP5
28
RD4/PSP4
27
RC7/RX/DT
26
RC6/TX/CK
25
RC5/SDO
24
RC4/SDI/SDA
23
RD3/PSP3
22
RD2/PSP2
21
SERIAL CONTROL OUT
R17
10K
0=BRIGHT
TRISTATE= OFF
1= DIM
R18
2K2
TRISTATE LED CONTROL
ROW 1
ROW 2
ROW 3
CLIP DETECT
OVERLOAD
OVER TEMP
DC OFFSET
MAINS FAIL
PHONES DETECT
SERIAL RX 232
SERIAL TX 232
SERIAL DATA
SERIAL CLOCK
SERIAL STROBE
LOGIC GND
SPEAKER TEST
PHONES DETECT
OVERLOAD
CLIP DETECT
DC OFFSET
OVER TEMP
MAINS FAIL
100N CERAMIC
C23
47R
FRONT PANEL GROUNDING
C19
C18
100n
100n
PIC INPUT EMC CAPS
IR IN (FROM RECEIVER ON PREAMP BOARD)
+5V
C1
100n
PROGRAM_CLOCK
PROGRAM_DATA
MCLR HUB
PGM
Programming Signals
To ABUS Hub PIC
P2
PAD
R16
P3
PAD
FRONT PANEL GND
ON/STBY LED
BLUE LED
C3
10U 16V
IR IN (FROM JACK & PHONO ON HUB PCB)
D2
C21
100n
LOGIC GND
LOGIC GND
AK
C15
100pF
LOGIC GND
C10
100n CER
LOGIC GND
100N CERAMIC
C9
10R
C11
R10
LOGIC GND
C16
100pF
100n CER
LOGIC GND
RS232 TX
RS232 RX
R23
R24
+5V
+15V
C22
C17
100n
100n
10R
10R
FRONT PANEL GND
BC337
LOGIC GND
MCLR HUB
PROGRAM_DATA
PROGRAM_CLOCK
BLOCK
PIC TX
HUB DATA
HUB CLOCK
Q6
PGM
CN1
1
2
3
4
5
6
7
8
9
10
11
12
FFC 12WAY
CONNECTOR TO PREAMP PCB
ROT1
1
ASW
2
BSW
3
C GND
4
FIX1
5
FIX2
NOBLE16ENCODER
R19
10K
1
TX
2
RX
3
RS232 GND
4
IR IN
5
IR GND
6
7
8
CN3
9
10
11
12
13
FFC 13WAY
RS232 & IR CABLE TO HUB PCB
SERIAL IN FROM A-BUS HUB BOARD
To enhance viewing, please print to A3 8
AP16369/3 Front Panel PCB Schematic (Microcontroller & LCD)
Cambridge Audio Azur 840A Amplifier
+5V
C8
100nF
LOGIC GND
C12
100nF
SHIFT REG DECOUPLE
C13
100nF
C14
100nF
FROM SHEET 1
SERIAL DATA
SERIAL CLOCK
SERIAL STROBE
SHIFT REG ENABLE
U3
2
D
3
CLK
1
STB
15
OE
74HC4094
VDD=+5V
VSS=LOGIC GND
U4
2
D
3
CLK
1
STB
15
OE
74HC4094
VDD=+5V
VSS=LOGIC GND
U5
2
D
3
CLK
1
STB
15
OE
74HC4094
VDD=+5V
VSS=LOGIC GND
U6
2
D
3
CLK
1
STB
15
OE
74HC4094
VDD=+5V
VSS=LOGIC GND
4
Q0
5
Q1
6
Q2
7
Q3
14
Q4
13
Q5
12
Q6
11
Q7
9
QS
10
QS
4
Q0
5
Q1
6
Q2
7
Q3
14
Q4
13
Q5
12
Q6
11
Q7
9
QS
10
QS
4
Q0
5
Q1
6
Q2
7
Q3
14
Q4
13
Q5
12
Q6
11
Q7
9
QS
10
QS
4
Q0
5
Q1
6
Q2
7
Q3
14
Q4
13
Q5
12
Q6
11
Q7
9
QS
10
QS
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
CN4
TO PREAMP BOARD
FFC 08WAY
CN5
TO PREAMP BOARD
FFC 08WAY
CN6
TO PREAMP BOARD
FFC 08WAY
CN7
TO INPUT BOARD
FFC 08WAY
To enhance viewing, please print to A3 9
AP16369/3 Front Panel PCB Schematic (Shift Registers)
Cambridge Audio Azur 840A Amplifier
R9
R11
D3
Q4 R5
R10
Q3
C9
D2
SW10
C21
C19
Q6
C22
R19
C16
R13
R12
C17
C15
C18
U1
R15
R14
C13
C14
U5U6
C12
C3
C1
SW11
U4
C5
X1
C6
U2
C8
U3
C7
SW9
SW1
SW2
SW3
SW4
C20
C4
CN2
(c) COPYRIGHT Audio Partnership PLC 2005
AP16370/3
AP16370/3
D7
R3
R7
D8
Q8
C2
SW5
SW6
SW7
SW8
R2
R1
Q1
R17
R4
C24
Q5
R6
R8
D4
R18
D5 D6
Q2
P2
C10
C11
R24
R23
ROT1
P3
C23
R16
To enhance viewing, please print to A3 10
AP16369/3 Front Panel PCB Layout (Top Side)
Cambridge Audio Azur 840A Amplifier
To enhance viewing, please print to A3 11
AP16369/3 Front Panel PCB Layout (Bottom Side)
Cambridge Audio Azur 840A Amplier Front Panel PCB BOM
AP No Value Description/Type Qty Component Ident Notes
RESISTORS
10R 0.25 W 1% Metal Film 3 R10, R23, R24
22R 0.25 W 1% Metal Film 1 R1
43R 0.25 W 1% Metal Film 1 R2
47R 0.25 W 1% Metal Film 1 R16
100R 0.25 W 1% Metal Film 1 R5
1K1 0.25 W 1% Metal Film 2 R6, R8,
2K2 0.25 W 1% Metal Film 4 R3, R7, R12, R18,
4K7 0.25 W 1% Metal Film 1 R4
10K 0.25 W 1% Metal Film 5 R11, R14, R15, R17, R19
22K 0.25 W 1% Metal Film 2 R9, R13
CAPACITORS
22pF Ceramic 50V 10% Pitch=5mm 2 C5, C6
100pF Ceramic 50V 10% Pitch=5mm 2 C15, C16
100nF Ceramic 50V 10% Pitch=5mm 17
10uF
SEMICONDUCTORS
PIC16F877A - I/P PIC Flash Microcontroller 40 pin DIL 1 U1
PY1100 74HC4094 Shift register 16 pin DIL 5 U2 - U6
TRANSISTORS
PY219 BC327-25 PNP Small Signal TO92 2 Q1, Q8
PY214 BC337-25 NPN Small Signal TO92 4 Q2, Q3, Q4, Q5
DIODES
BLUE LED Blue LED 3mm UNI at top 1 D2
1N4148 General purpose diode 4 D4,D5, D6,D7
1N4002 General Purpose Rectier 1 D3
MISCELLANEOUS
PY1141 D100-SSV-12
PY1142 D100-SSV-13
PY1140 D100-SSV-08
PY1138
REB161(9x7)PVB20FHIN
B 1-2-24E
MULTITURN PRESET
20K
16V Electrolytic Radial (Height
=5.2mm) Pitch=2.5mm
12-WAY FFC reverse-needle type,
single-row contacts
13-WAY FFC reverse-needle type,
single-row contacts
8-WAY FFC FRONT-PREAMP
CONNS, reverse-needle type singlerow contacts
Noble ROTARY ENCODER 1 ROT1
caT000-002020-0042340YP
Side adjust. Foot print 9.5 x 4.5 mm 1 PR1
C1, C2, C7, C8, C9, C10, C11,
C12-C14, C17 - C21, C22, C23
3 C3, C4, C24 Note: Low prole electrolytic
Contact Audio Partnership Service
Department
1 CN1
1 CN3
4 CN4, CN5, CN6, CN7
11WS-1WS11hctiwst
1X1H4/94CHLATSYRCzHM02
AP16372/5
.esaC53ODWm0048D1Wm0047V2edoidreneZ7V2-C97XZB
Note: resistors, capacitors and other 'generic' electronic components are not usually stocked
by the manufacturer. Please obtain these locally.
12
Cambridge Audio Azur 840A Amplifier
INPUT1 L-
INPUT1 L+
INPUT 1
CN1:B
3
QUAD PHONO
INPUT 2
CN1:D
6
QUAD PHONO
INPUT 3
CN2:B
3
QUAD PHONO
INPUT 4
CN2:D
6
QUAD PHONO
INPUT 5
CN3:B
3
QUAD PHONO
INPUT 6
CN3:D
6
QUAD PHONO
INPUT 7
CN4:B
3
QUAD PHONO
TAPE RETURNLEFT
CN4:D
6
QUAD PHONO
TAPE OUT L
CN5:B
3
QUAD PHONO
R22
100R
R1
220K
R2
220K
R6
220K
R7
220K
R30
220K
R32
220K
R24
220K
R57
R58
C39
10UNP 35V
C41
10UNP 35V
C45
10UNP 35V
C46
10UNP 35V
C47
10UNP 35V
C60
10UNP 35V
C69
10UNP 35V
C6
22pF
10K
R60
U14:B
NE5532
20K
6
5
20K
R59
10K
22pF
C5
6
R4
5
1K
C24
R45
47pF
100K
6
R5
5
1K
R47
C23
100K
47pF
6
R8
5
1K
R66
C22
100K
47pF
6
R10
5
1K
R67
C15
100K
47pF
6
R31
5
1K
R68
C14
100K
47pF
6
R33
5
1K
R76
C13
100K
47pF
6
R36
5
1K
C31
R81
100K
47pF
LEFT
RL1:B
C77
C40
C42
C48
C49
C50
C61
C68
10U16V NP
R44
47K
R46
47K
R55
47K
R56
47K
R65
47K
R77
47K
R82
47K
4
5
RELAY
HUB1L
RL2:B
4
5
RELAY
HUB2L
RL3:B
4
5
RELAY
HUB3L
RL4:B
4
5
RELAY
HUB4L
RL5:B
4
5
RELAY
HUB5L
RL6:B
4
5
RELAY
HUB6L
RL7:B
4
5
RELAY
HUB7L
TAPERETN L
C34
47NPE 63V
U2:A
NE5532
R9
1
100R
R3
7
47R
U3:B
7
NE5532
10U16V NP
U5:B
7
NE5532
10U16V NP
U6:B
7
NE5532
10U16V NP
U7:B
7
10U16V NP
NE5532
U8:B
7
10U16V NP
NE5532
U18:B
7
10U16V NP
NE5532
U9:B
NE5532
7
10U16V NP
C33
47NPE 63V
INPUT1 R+
INPUT1 R-
3
INPUT1 L+
INPUT1 L-
3
3
3
3
3
3
-15V
C11
10U16V NP
2
R35
100K
3
+15V
8 4
CN10
1
INPUTONE RIGHT +
2
INPUTONE RIGHT -
3
GND
4
GND
5
INPUTONE LEFT +
6
INPUTONE LEFT -
JST2,5MM B6B-XH-A
RL8:B
4
5
RELAY
INPUTL
3
INPUT1 R-
INPUT1 R+
INPUT 1
CN1:A
1
QUAD PHONO
INPUT 2
CN1:C
4
QUAD PHONO
INPUT 3
CN2:A
1
QUAD PHONO
INPUT 4
CN2:C
4
QUAD PHONO
INPUT 5
CN3:A
1
QUAD PHONO
INPUT 6
CN3:C
4
QUAD PHONO
INPUT 7
CN4:A
1
QUAD PHONO
TAPE RETURN R
CN4:C
4
QUAD PHONO
TAPE OUT R
CN5:A
1
QUAD PHONO
R61
R62
R34
2
100R
5
R12
220K
2
R13
220K
5
R20
220K
2
R21
220K
5
R28
220K
2
R29
220K
C70
5
10UNP 35V
R25
220K
2
C38
10UNP 35V
C36
10UNP 35V
C51
10UNP 35V
C52
10UNP 35V
C53
10UNP 35V
C62
10UNP 35V
C7
22pF
R63
10K
20K
2
3
20K
8 4
22pF
R64
10K
C8
R15
1K
C32
47pF
R16
1K
C27
47pF
R17
1K
C25
47pF
R18
1K
C26
47pF
R26
1K
C28
47pF
R27
1K
C29
47pF
R37
1K
C30
47pF
U14:A
NE5532
-15V
RIGHT
C71
R14
1
47R
10U16V NP
C4
100nF
+15V
-15V
U3:A
NE5532
2
3
R42
100k
2
3
R40
100K
2
3
R69
100K
2
3
R70
100K
2
3
R71
100K
2
3
R78
100K
2
3
R75
100K
C37
1
10U16V NP
8 4
C43
47NPE 63V
+15V
-15V
U5:A
NE5532
C35
1
10U16V NP
C44
8 4
47NPE 63V
+15V
-15V
U6:A
NE5532
C57
1
10U16V NP
8 4
C54
47NPE 63V
+15V
-15V
U7:A
NE5532
C58
1
10U16V NP
8 4
C55
47NPE 63V
+15V
-15V
U8:A
NE5532
C59
1
10U16V NP
C56
8 4
47NPE 63V
+15V
-15V
U18:A
NE5532
C63
1
10U16V NP
8 4
C64
47NPE 63V
+15V
-15V
U9:A
NE5532
C66
1
10U16V NP
8 4
C67
47NPE 63V
+15V
R19
100R
R43
47K
R41
47K
R72
47K
R73
47K
R74
47K
R79
47K
R80
47K
C17
47NPE 63V
RL1:C
7
6
8
RELAY
HUB1R
RL2:C
7
6
8
RELAY
HUB2R
RL3:C
7
6
8
RELAY
HUB3R
RL4:C
7
6
8
RELAY
HUB4R
RL5:C
7
6
8
RELAY
HUB5R
RL6:C
7
6
8
RELAY
HUB6R
RL7:C
7
6
8
RELAY
HUB7R
C12
10U16V NP
RL8:C
7
6
8
RELAY
R38
100K
TAPERETN R
-15V
47NPE 63V
C16
U4:A
NE5532
2
1
3
+15V
8 4
GROUNDTERMINAL
J1
TERMINAL
P1
PAD
HUB1L
HUB2L
HUB3L
HUB4L
HUB5L
HUB6L
HUB7L
TAPERETN L TAPE RETN R
HUBIN L
INPUTR
-15V
C1
100nCER
U1
1
Vss
2
L-S1
3
L-S2
4
L-S3
5
L-COM1
6
L-S4
7
L-S5
8
L-S6
9
L-COM2
10
L-S7
11
L-S8
12
L-COM3
13
ST
14
GND
TC9163
HUB INPUT SWITCHER
PREAMP OUT
CN5:D
QUAD PHONO
PREAMP OUT
CN5:C
4
QUAD PHONO
C3
100nF100V
R23
100R
C72
100nF100V
R85
100R
R-COM1
R-COM2
R-COM3
+15V
C2
100nCER
Vdd
28
R-S1
R-S2
R-S3
R-S4
R-S5
R-S6
R-S7
R-S8
DATA
CLK
HUB1R
27
HUB2R
26
HUB3R
25
24
HUB4R
23
HUB5R
22
HUB6R
21
20
HUB7R
19
18
17
16
15
HUBIN R
LOGICGND
HUBIN L
CN6
HUBIN L
1
HUBIN R
2
GND
3
GND
4
+5V
+5VPOWER TO HUB
5
6
7
SWITCHERDATA
8
SWITCHERCLOCK
9
SWITCHERSTROBE
10
FFC10WAY
INPUT PCB - HUB PCB
6
PREAMPOUT L
5
PREAMPOUT R
To enhance viewing, please print to A3 13
AP16361/3 Input PCB Schematic (Input Select)
INPUT PCB - PREAMP PCB
CN9
1
2
3
4
5
6
JST 2,5MM B6B-XH-A
CN7
1
2
3
4
5
6
7
8
FFC 08WAY
TO PREAMP LEFT
TO PREAMP RIGHT
PREAMP OUT L
PREAMP OUT R
+5V
+9V
+15V
-15V
LOGIC GND
CN8
1
2
3
4
5
6
7
8
FFC 08WAY
FROM FRONT PANEL PCB
Cambridge Audio Azur 840A Amplifier
+9V
U16
1
IN1
2
IN2
3
IN3
4
IN4
5
IN5
6
IN6
7
IN7
GND8COM
ULN2003A
+5V
LOGIC GND
C65
100nF 100V
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
RL1:A
1
2
RELAY
INPUT 1 INPUT 2 INPUT 3 INPUT 4 INPUT 5 INPUT 6 INPUT 7
16
15
14
13
12
11
10
9
+9VLOGIC GND
RL2:A
1
2
RELAY
RL3:A
1
2
RELAY
RL4:A
1
2
RELAY
RL5:A
1
2
RELAY
RL6:A
1
2
RELAY
R11
10K
RL7:A
1
2
RELAY
D1
1N4001
Q1
BC337
TAPE MONITOR
RL8:A
1
2
RELAY
LOGIC GND
To enhance viewing, please print to A3 14
AP16361/3 Input PCB Schematic (Input Control)
Cambridge Audio Azur 840A Amplifier
+15V
INPUT L
INPUT R
C21
10U 16V NP
R39
100K
C20
10U 16V NP
R53
100K
R52
100K
R54
100K
U2:B
5
6
NE5532
-15V
INPUT AMPLIFIER
+15V
U4:B
5
6
NE5532
-15V
7
+6dB
7
R50
1k
R51
1k
R48
1k
R49
1k
C19
22p
C18
22p
C9
1000uF 10V EL
C10
1000uF 10V EL
R83
47R
R84
47R
TO PREAMP LEFT
D2
1N4001
TO PREAMP RIGHT
To enhance viewing, please print to A3 15
AP16361/3 Input PCB Schematic (Input Amplifier)
Cambridge Audio Azur 840A Amplifier
R34
R64
R61
R62
R14
R57
CN7
TO PREAMP PCBCN11
CN6
TO HUB PCB
AP16362/3
C8
R58
INPUT 1
R
C7
C71
CN10
R59
C4
R60
R63
U14
C65
FROM FRONTPANEL PCB
CN8
Q1
AP16362/3
INPUT 4
INPUT 3
INPUT 2
CN1
CN2
R
C38
R15
C37
R42
C43
C40
U3
RL2
RELAY DRIVERLOGIC
U16
C3
R23
L
C36
C39
R16
R4
C35
U5
C24
C27
R41
R40
R44
R45
RL3
J1
R22
L
R3
C5
C6
R12
C77
C32
R43
RL1
D1
R11
R
R1
R13
R
L
C41
C51
R2
R5
C44
C42
R17
C57
R20
C23
C25
R47
R46
R69
R72
RL4
C2
C1
U1
HUB SWITCHER
INPUT 5
R
C
2
L
R
R6
C45
C54
R8
R21
C48
U6
C22
C26
R55
R73
R66
4
5
6
C
R70
L
R7
R28
C55
C49
R18
C58
U7
C53
R26
R10
C59
C15
C28
R67
R71
R56
R74
RL5 RL6
INPUT 6
INPUT 7
CN3
CN4
L
R30
R29
R
L
R
C47
C56
R31
C50
U8
C14
C29
C60
C62
C64
R27
C61
C63
U18
C70
R37
R33
R32
R25
C13
C30
R68
R78
R65
R79
R76
R77
TAPE RETURN
L
R
C66
C69
R36
C67
R24
R75
C31
C72
RL8
TAPE OUT
U9
R80
R82
C17
CN5
PREAMP OUT
L
R
C68
C16
R50
R19
R81
U4
R38
R85
C12
C33
C10
C9
L
C20
C19
R52
R53
R51
C11
CN9
R84
R35
R9
P1
R83
U2
C21
R48
C18
C34
R54
R49
R39
CN9 TO PREAMPPCB
RL7
To enhance viewing, please print to A3 16
AP16361/3 Input Board PCB Board Layout (Top Side)
Cambridge Audio Azur 840A Amplifier
To enhance viewing, please print to A3 17
AP16361/3 Input Board PCB Board Layout (Bottom Side)
-
Cambridge Audio Azur 840A Amplier Input PCB BOM
RESISTORS
48R,38R,41R,3R4mliFlateMW521.0R74
9R6mliFlateMW521.0R001
R4, R5, R8, R10, R15-R18, R26, R27,
81mliFlateMW521.0K1
R31, R33, R36, R37, R48-R51
lateMW521.0K02
R41, R43, R44, R46, R55, R56, R65,
31mliFlateMW521.0K74
R72-R74, R77, R79, R80, R82
R35, R38-R40, R42, R45, R47, R52-
02mliFlateMW521.0K001
R54, R66-R71, R75, R76, R78, R81
R1, R2, R6, R7, R12, R13, R20, R21,
41mliFlateMW521.0K022
R24, R25, R28-R30, R32
CAPACITORS
hctiP%01V05cimareCFp22
C16, C17, C33, C34, C43, C44, C54
11mm5=hctiPretseyloP%01V36Fn74
C56, C64, C67
10uF
10uF
1000uF
SEMICONDUCTORS
3619CT674YP
PY1162 NE5532 Low Noise Dual Audio Op-Amp (SMT) 10 U3, U5-U9, U18, U2, U4, U14 SO8 Package
TRANSISTORS
P
DIODES
MISCELLANEOUS
16V Non Polarised Electrolytic Radial
(5.2mm) Pitch= 2.5mm
35V Non Polarised Electrolytic Radial
(5.2mm) Pitch= 2.5mm
10V Electrolytic Radial (10mm) Pitch=
5mm
VSS-001DYAW-8CFF0411YP
C11, C12, C20, C21, C35, C37 C40,
20
C42, C48-C50, C57-C59, C61, C63,
C66, C68, C71, C77
C36, C38, C39, C41, C45-C47, C51-
14
C53, C60, C62, C69, C70
2 C9, C10
5NC-1NC5ONOHPTEKCOSONOHPDAUQ
8NC,7NC280-
6NC101-VSS-001DYAW-01CFF3411YP
8LR-1LR8CDV99-2-EMYALER
26R,16R,85R,75R4mliF
91C,81C,8C-5C6mm3=
23C-22C,51C-31C41mm3=hctiP%01V05cimareCFp74
01NC,9NC2redaehlacitreVA-HX-B6BMM5.2TSJ
58R,43R,32R,22R,91R,
46R,36R,06R,95R,11R5mliFlateMW521.0K01
27C,56C,3C,4C,2C,1C6mm5=hctiP%01V05cimareCFn001
Input 1 audio conn,
i/o conn
Vertical FFC conn,
reverse-needle type
Vertical FFC conn,
reverse-needle type
AP16364/3
setoNtnedItnenopmoCytQepyT/noitpircseDeulaVoNPA
egakcaP82POS1U1yarrAhctiwSeugolanAFA
egakcaP61LID61U1srevirDnotgnilraD7A3002NLU8511YP
egakcaP29OT1Q1langiSllamSNPN52-733CB412Y
14OD1D1edoiD1004N1
Note: resistors and other 'generic' electronic components are not usually stocked by the
manufacturer. Please obtain these locally.
18
Cambridge Audio Azur 840A Amplifier
AC
INPUT PCB - PREAMP PCB FRONT PCB - PREAMP PCB
CN11
1
2
3
4
5
6
7
8
CONN FFC-8
SHIFT REGISTERCONNECTOR
FROM FRONT PANEL PCB
SHIFT REGISTERCONNECTOR
FROM FRONT PANEL PCB
SHIFT REGISTERCONNECTOR
FROM FRONT PANEL PCB
+15V
+5V
+9V
LOGIC GND
-15V
CN6
1
2
3
4
5
6
7
8
CONN-H8
CN8
1
2
3
4
5
6
7
8
CONN-H8
CN9
1
2
3
4
5
6
7
8
CONN-H8
ELBACELBAC
CN2
CONN FFC-12
1
2
3
4
5
6
7
8
LOGIC GND
1
2
3
4
5
6
7
LOGIC GND
1
2
3
4
5
6
7
LOGIC GND
1
2
3
4
5
6
7
8
9
10
11
12
U4
IN1
IN2
IN3
IN4
IN5
IN6
IN7
GND
ULN2003A
U5
IN1
IN2
IN3
IN4
IN5
IN6
IN7
GND8COM
ULN2003A
U7
IN1
IN2
IN3
IN4
IN5
IN6
IN7
GND8COM
ULN2003A
+5V
SPEAKER TEST
ON/STBY LED
PHONES DETECT
OVERLOAD
CLIP DETECT
DC OFFSET
OVERTEMP
MAINS FAIL
IR RX
OUT1
16
OUT2
15
OUT3
14
OUT4
13
OUT5
12
OUT6
11
OUT7
10
COM
9
OUT1
16
OUT2
15
OUT3
14
OUT4
13
OUT5
12
OUT6
11
OUT7
10
9
OUT1
16
OUT2
15
OUT3
14
OUT4
13
OUT5
12
OUT6
11
OUT7
10
9
XD ON/OFF
OUTPUT RELAY A
OUTPUT RELAY B
IR RX
RL2:A
1
2
RELAY
+5V
R104
47R
LOGIC GND
U10
OPT
1
GND
2
+5V
3
TSOP18 IR RX
IR RECEIVER
TSOP1836/37
RL3:A
1
2
RELAY
RL4:A
1
2
RELAY
C19
100n ceramic
RL5:A
1
2
RELAY
C20
10U 16V
RL6:A
1
2
RELAY
+15V
LOGIC GND
+9V
RL1:A
1
2
RELAY
VOL1 VOL2 VOL3 VOL4 VOL5 VOL6 VOL7 VOL8
LOW VOLUME
+9V
+9V
+9V
+9V
LOGIC GND
+5V
C27
100n ceramic
ULN2003 DECOUPLERS
LO = MAINS ON
C29
100n ceramic
RL13:A
1
2
RELAY
RL12:A
1
2
RELAY
VOL 12 VOL 13 VOL 14
C28
100n ceramic
R100
22K
R110
10K
HIGH VOLUME
R111
4K7
MAINS ON/OFF RELAYINRUSHRELAY
RL14:A
1
2
RELAY
RL15:A
1
2
RELAY
BAL L BAL R BAL1
+5V
R83
22K
Q1
BC337
Q2
BC337
R21
430R
RL16:A
1
2
RELAY
ON/STBY LED
R20
430R
ON/STBY LED CONTROL
LOGIC GND
RL7:A
1
2
RELAY
RL17:A
1
2
RELAY
RL8:A
1
2
RELAY
RL18:A
1
2
RELAY
BAL 2
RL9:A
1
2
RELAY
RL10:A
1
2
RELAY
RL11:A
1
2
RELAY
VOL 9 VOL 10 VOL 11
RL19:A
1
2
RELAY
BAL 3
+5V
PHONES R
PHONES L
PHONES GND
CN1
8
7
3
2
4
5
1
PHONES DETECT
HI = PHONE JACK OUT
R19
100K
HEADPHONE JACK
TIP = LEFT
RING = RIGHT
LOGIC GND
RSW1
RSW2
R
L
LSW2
LSW1
GND
To enhance viewing, please print to A3 19
AP16365/4 Preamp PCB Schematic (Relay Logic)
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