Cambridge Audio azur 840A User manual

Gallery Court Hankey Place London SE1 4BB UK
Tel: [phone] Fax: [phone]
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)
AP19597/1
1

840A SERVICE MANUAL
TABLE OF CONTENTS
Safety Precautions & Important Notes 4
Block Diagram 5
Exploded Diagram 6
Exploded Diagram Parts List 7
Front Panel PCB Schematic (Microcontroller & LCD) 8
Front Panel PCB Schematic (Shift Registers) 9
Front Panel PCB Layout (Top Side) 10
Front Panel PCB Layout (Bottom Side) 11
Front Panel PCB BOM 12
Input PCB Schematic (Input Select) 13
Input PCB Schematic (Input Control) 14
Input PCB Schematic (Input Amplifier) 15
Input PCB Board Layout (Top Side) 16
Input PCB Board Layout (Bottom Side) 17
Input PCB BOM 18
Preamp PCB Schematic (Relay Logic) 19
Preamp PCB Schematic (Tone Control) 20
Preamp PCB Schematic (Post Amp) 21
Preamp PCB Board Layout (Top Side) 22
Preamp PCB Board Layout (Bottom Side) 23
Preamp PCB BOM 24-25
Power Amplifier Schematic (Right Power Supplies & PSU) 26
Power Amplifier Schematic (Right Channel) 27
Power Amp Right & PSU PCB Board Layout (Top Side) 28
Power Amp Right & PSU PCB Board Layout (Bottom Side) 29
Power Amp Right PCB BOM 30-31
Power Amp PSU PCB BOM 32
Power Amp Schematic (Left Channel) 33
Power Amp Schematic (Left Power Supplies) 34
Power Amp PCB Board Layout (Top Side) 35
Power Amp PCB Board Layout (Bottom Side) 36
Power Amp Left PCB BOM 37-38
Hub PCB Schematic 39
2

Hub PCB Board Layout (Top Side) 40
Hub PCB Board Layout (Bottom Side) 41
Hub PCB BOM 42-43
Rectifier PCB Schematic 44
Rectifier PCB Board Layout (Top Side) 45
Rectifier PCB Board Layout (Bottom Side) 46
Rectifier PCB BOM 47
IC Pin Layout Details 48-49
Technical Description 51-60
Procedure to upgrade the Control (Pic) Software 61-62
Notes 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.
© 2007Audio 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
840A Block Diagram
To enhance viewing, please print to A3 5

7
10
62
3
9
17
418
15
8
13
5
11
16
6
1
15
14
12
5
Cambridge Audio Azur 840A Amplifier
840A Exploded Diagram
To enhance viewing, please print to A3 6

Cambridge Audio Azur 840A Amplifier
Exploded Diagram Parts List
Drawing
Ref:
AP Part
Number noitpircseD:feRyrotcaF
1 PY1118 2331-004909E301 Speaker Binding Post BP331 (Black) Red & Black 2 PY1019 3200-053044E00
0
Toroid 230V/50Hz 36.5VACx4 5.5A TI-053044
C
2 PY1020 3200-053045E00
0
Toroid 115V/50Hz 36.5VAC 5.5A TI-0853045C for 840A
3 PY1119 3200-074051E001 Toroid 230V/50Hz 7.5VAC750MA 17VAC*2 TO7405B ST
B
3 PY1120 3200-077811E00
0
Toroid 115V/50Hz 7.5VAC750MA 17VAC*2 ST
B
4 PY1121 6074-150003E000-01 840A Bass / Treble Knob (Black) Painted Blac
k
4 PY1123 6074-150003E001A01 840A Bass / Treble Knob (Silver) Painted Silve
r
5 PY1122 6074-150004E00
0
A
zur 840A Plastic Foot (Black) AP16837
*
5 PY1124 6074-150004E000A01
A
zur 840A Plasitc Foot (Silver) AP16837
*
PY1125 6574-150009E000-01
A
zur 840A Top Panel Black Painted
PY1126 6574-150009E000-0
2
A
zur 840A Top Panel Silve
r
6 PY112
7
6574-150013E000-01
A
zur 840A Side Panel, Black Painted
6 PY1128 6574-150013E000A01
A
zur 840A Side Panel,Silve
r
7 PY1129 8584-015010E301
A
zur 840A Black Front Panel Ass
y
7 PY1130
A
zur-840A Silver Front Panel Ass
y
8 PY1131 6574-150012E000-01
A
zur 840-A B Front Panel Artwork AP186371/186381 (Metalwork Only
)
8 PY1132
A
zur 840-A Silver Front Panel Artwork AP186371/186381 (Metalwork Only
)
PY1133 6074-150005E00
0
A
zur 840A Volume Knob Plastic Insert (AP1743*)
6574-150015E00
0
A
zur 840A Volume Knob Skin, Black
A
zur 840A Volume Knob Skin, Silver
PY1135 3110-840000E00
0
LCD Display Highly Transflective DC00003E02 840
A
PY1136 6600-990112E00
0
A
zur 840A Display Backlight (AP16841*)
PY1138 2409-010200E001 Rotary Encoder Switch REBG161(9*7)PVB20FHINB1-2-24
E
9 PY1139 9484-015000E041
A
zur-840A AMP-Hub Control PCB Assy Rev
A
10 PY1159 9484-015000E341
A
zur-840A Amp Input PCB Assy Rev
A
11 PY1153 9484-015000E141
A
zur-840A EU/UK PSU Power Control PCB Assy Rev
A
12 PY1146 9484-015000E091
A
zur-840A Main-Amp Left PCB Assy Rev
A
13 PY1163 9484-015001E091
A
zur-840A Main-Amp Right PCB Assy Rev
A
14 PY1155 9484-015000E331
A
zur-840A Pre-Amp Board Rev
A
15 PY1145 9484-015000E071
A
zur-840A Amp-Rectifier PCB Rev
A
16 PY113
7
9484-015000E111
A
zur-840A Amp Front Control PCB Assy Rev
A
1
7
PY1134 9484-015000E061
A
zur-840A LCD Display Board Assy Rev
A
18 PY1165 9805-084000E001
A
zur-840A Remote Control Assy Rev
A
All spare parts should be ordered from AP Hong Kong office
7

Cambridge Audio Azur 840A Amplifier
AP16369/3 Front Panel PCB Schematic (Microcontroller & LCD)
MCLR/VPP
1
RA0/AN0
2
RA1/AN1
3
RA2/AN2
4
RA3/AN3/VREF
5
RA4/T0CKI
6
RA5/AN4/SS
7
RE0/RD/AN5
8
RE1/WR/AN6
9
RB4
37
RB3/PGM
36
RB2
35
RB0/INT
33
VDD
32
VSS
31
RD7/PSP7
30
RD6/PSP6
29
RB1
34
RD5/PSP5
28
RD4/PSP4
27
RC7/RX/DT
26
RC5/SDO
24
RC4/SDI/SDA
23
RD3/PSP3
22
RD2/PSP2
21
RC6/TX/CK
25
VDD
11
VSS
12
OSC1/CLKIN
13
OSC2/CLKOUT
14
RCO/T1OSO/T1CKI
15
RC1/T1OSI/CCP2
16
RC2/CCP1
17
RC3/SCK/SCL
18
RD0/PSP0
19
RE2/CS/AN7
10
RD1/PSP1
20
RB5
38
RB6/PGC
39
RB7/PGD
40
U1
PIC16F877A
SW1
SW-TACT
SW2
SW-TACT
SW3
SW-TACT
SW5
SW-TACT
SW6
SW-TACT
SW7
SW-TACT
SW8
SW-TACT
SW4
SW-TACT
SW9
SW-TACT
SW10
SW-TACT
SW11
SW-TACT
INPUT 1 INPUT 2 INPUT 3 INPUT 4
INPUT 5 INPUT 6 INPUT 7 TAPE MON
MODE spare
+5V
LOGIC GND
LCD DISPLAY CONN
C10
100n CER
C11 100n CER
LOGIC GND
SERIAL DATA
SERIAL CLOCK
SERIAL STROBE
SERIAL CONTROL OUT
SERIAL IN FROM A-BUS HUB BOARD
OVERLOAD
HUB DATA
CLIP DETECT
MAINS FAIL
DC OFFSET
PHONES DETECT
PORT B HAS WEAK PULLUPS
RB4-RB7 HAS INTRPT ON CHANGE
R1
22R
R2
43R
Q2
BC337
LOGIC GND
R4
4K7
C1
100n
C2
100nF
ON/STBY SPEAKER SELECT
LOGIC GND
ROW 3
ROW 2
ROW 1
COL 1 COL 2 COL 3 COL 4
X1
CRYSTAL
FREQ=20MHz
C5
22pF
C6
22pF
LOGIC GND
+5V
LOGIC GND
CONNECTOR TO PREAMP PCB
SERIAL IN FROM A-BUS HUB BOARD
Vss 1
Vdd 2
Vo 3
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
LOGIC GND
TX
RX
RS232 & IR CABLE TO HUB PCB
IR IN (FROM RECEIVER ON PREAMP BOARD)
C GND
3
ASW
1
BSW
2
FIX2
5
FIX1
4
ROT1
NOBLE16ENCODER
POSITION FOR
EXTRA SWITCH
AK
D2
BLUE LED
ON/STBY LED
IR IN (FROM JACK & PHONO ON HUB PCB)
+15V
IR GND
IR IN
RS232 GND
R10
10R
C9
100N CERAMIC
SERIAL RX 232
C4
10U 16V
C3
10U 16V
R5
100R C20
100nF
LOGIC GND
C21
100n
LOGIC GND
LOGIC GND
Q4
BC337
+15V
RS232 TX
R13
22K
R12
2K2
LOGIC GND
SERIAL TX 232
Q3
BC337
+5V
D3
1N4002
RS232 RX
R11
10K
R9
22K
LOGIC GND
SERIAL RX 232
RS232 RX
RS232 TX
SERIAL TX 232
PROGRAM_CLOCK
PROGRAM_DATA
PGM
MCLR HUB
R14
10K
+5V
+5V
Programming Signals
To ABUS Hub PIC
RS232 TX
RS232 RX
MCLR HUB
PGM
PROGRAM_DATA
PROGRAM_CLOCK
HUB CLOCK
HUB CLOCK
HUB DATA
R3
2K2
OVER TEMP
OVER TEMP
1
2
3
4
5
6
7
8
9
10
12
13
11
CN3
FFC 13WAY
BLOCK
PIC TX
SHIFT REG ENABLE
D
2
CLK
3
STB
1
OE
15
Q0
4
Q1
5
Q2
6
Q3
7
Q4
14
Q5
13
Q6
12
Q7
11
QS
9
QS
10
U2
74HC4094
VDD=+5V
VSS=LOGIC GND
SHIFT REG ENABLE
SERIAL DATA
SERIAL CLOCK
BLOCK
PIC TX
IR CONTROL
PHONES DETECT
OVERLOAD
DC OFFSET
MAINS FAIL
LCD DECOUPLE
C7
100nF
LOGIC GND
+5V
SHIFT REG DECOUPLE
1
2
3
4
5
6
7
8
9
10
11
12
CN1
FFC 12WAY
12
15 16
1
2
3
4
5
6
1a
2a
3a
4a
5a
6a
7
8
7a
8a
CN2
CONN-8 DUAL BOT
RS
E
LCD DATA SHIFT REGISTER
2
1
16
15
LCD CONN ORIENTATION FROM FRONT
C15
100pF
C16
100pF
C17
100n
C18
100n
C19
100n
CLIP DETECT
PIC INPUT EMC CAPS
LED BACKLIGHT POWER
R6
1K1
R7
2K2
R8
1K1
SPEAKER TEST
SPEAKER TEST
C22
100n
+5V
TRISTATE LED CONTROL
0=BRIGHT
TRISTATE= OFF
1= DIM
R15
10K
LOGIC GND
R16
47R
C23
100N CERAMIC
LOGIC GND
FRONT PANEL GROUNDING
Q5
BC337
R17
10K
R18
2K2
C24
10U 16V
Q6
BC337
R19
10K
LOGIC GND
FRONT PANEL GND
FRONT PANEL GND
P2
PAD
P3
PAD
Q1
BC327-25
2
CW
3
CCW
1
PR1
PRESET 20K 3296W
CW
Q8
BC327-25
R23 10R
R24 10R
D4
1N4148
D5
1N4148
D6
1N4148
D7
1N4148
D8
BZX79C2V7 500MW
To enhance viewing, please print to A3 8

Cambridge Audio Azur 840A Amplifier
AP16369/3 Front Panel PCB Schematic (Shift Registers)
D
2
CLK
3
STB
1
OE
15
Q0
4
Q1
5
Q2
6
Q3
7
Q4
14
Q5
13
Q6
12
Q7
11
QS
9
QS
10
U3
74HC4094
VDD=+5V
VSS=LOGIC GND
LOGIC GND
D
2
CLK
3
STB
1
OE
15
Q0
4
Q1
5
Q2
6
Q3
7
Q4
14
Q5
13
Q6
12
Q7
11
QS
9
QS
10
U4
74HC4094
VDD=+5V
VSS=LOGIC GND
D
2
CLK
3
STB
1
OE
15
Q0
4
Q1
5
Q2
6
Q3
7
Q4
14
Q5
13
Q6
12
Q7
11
QS
9
QS
10
U5
74HC4094
VDD=+5V
VSS=LOGIC GND
FROM SHEET 1 SERIAL CLOCK
SERIAL DATA
SERIAL STROBE
SHIFT REG ENABLE
1
2
3
4
5
6
7
8
CN4
FFC 08WAY
1
2
3
4
5
6
7
8
CN5
FFC 08WAY
1
2
3
4
5
6
7
8
CN6
FFC 08WAY
D
2
CLK
3
STB
1
OE
15
Q0
4
Q1
5
Q2
6
Q3
7
Q4
14
Q5
13
Q6
12
Q7
11
QS
9
QS
10
U6
74HC4094
VDD=+5V
VSS=LOGIC GND
1
2
3
4
5
6
7
8
CN7
FFC 08WAY
C8
100nF
+5V
C12
100nF
C13
100nF
C14
100nF
SHIFT REG DECOUPLE
TO PREAMP BOARD
TO PREAMP BOARD
TO PREAMP BOARD
TO INPUT BOARD
To enhance viewing, please print to A3 9

Cambridge Audio Azur 840A Amplifier
AP16369/3 Front Panel PCB Layout (Top Side)
AP16370/3
(c) COPYRIGHT Audio Partnership PLC 2005
U1
ROT1
SW1
SW2
SW3
SW4
SW5
SW6
SW7
SW8
X1
SW9
SW10 SW11
C1
C2
C3
C4
C5
C6
C10
C11
C12
C13
C14
C15
C17
R1
R2
R3
R4
R6
D2
D3
R9
R10
R11
R12
R13
R14
R15
C7
C8
C9
C16
C18
C19
Q1
Q2
Q3 Q4 R5
C20
AP16370/3
C21
C22
R7
U2
U3
U4
U5U6
C24
Q5
R17
R18
R19
Q6
C23
P2
P3
R16
CN2
R23
R24
Q8
R8
D4
D5 D6
D7
D8
To enhance viewing, please print to A3 10

Cambridge Audio Azur 840A Amplifier
AP16369/3 Front Panel PCB Layout (Bottom Side)
To enhance viewing, please print to A3 11

AP16372/5
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 C1, C2, C7, C8, C9, C10, C11,
C12-C14, C17 - C21, C22, C23
10uF 16V Electrolytic Radial (Height
=5.2mm) Pitch=2.5mm 3 C3, C4, C24 Note: Low prole electrolytic
SEMICONDUCTORS
PIC16F877A - I/P PIC Flash Microcontroller 40 pin DIL 1 U1 Contact Audio Partnership Service
Department
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
.esaC53ODWm0048D1Wm0047V2edoidreneZ7V2-C97XZB
1N4002 General Purpose Rectier 1 D3
MISCELLANEOUS
PY1141 D100-SSV-12 12-WAY FFC reverse-needle type,
single-row contacts 1 CN1
PY1142 D100-SSV-13 13-WAY FFC reverse-needle type,
single-row contacts 1 CN3
PY1140 D100-SSV-08
8-WAY FFC FRONT-PREAMP
CONNS, reverse-needle type single-
row contacts
4 CN4, CN5, CN6, CN7
PY1138 REB161(9x7)PVB20FHIN
B 1-2-24E Noble ROTARY ENCODER 1 ROT1
11WS-1WS11hctiwst
caT000-002020-0042340YP
1X1H4/94CHLATSYRCzHM02
MULTITURN PRESET
20K Side adjust. Foot print 9.5 x 4.5 mm 1 PR1
Cambridge Audio Azur 840A Amplier Front Panel PCB BOM
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
AP16361/3 Input PCB Schematic (Input Select)
5
4
CN1:C
QUAD PHONO
6
CN1:D
QUAD PHONO
2
1
CN1:A
QUAD PHONO
3
CN1:B
QUAD PHONO
5
4
CN2:C
QUAD PHONO
6
CN2:D
QUAD PHONO
2
1
CN2:A
QUAD PHONO
3
CN2:B
QUAD PHONO
5
4
CN4:C
QUAD PHONO
6
CN4:D
QUAD PHONO
2
1
CN3:A
QUAD PHONO
3
CN3:B
QUAD PHONO
-15V +15V
R1
220K
R2
220K
R3
47R
R4
1K
R5
1K
R6
220K
R7
220K
R8
1K
R9
100R
R10
1K
R12
220K
R13
220K
R14
47R
R15
1K
R16
1K
R17
1K
R18
1K
R19
100R
R20
220K
R21
220K
C1
100n CER
C2
100n CER
R23
100R
C3
100nF 100V
R24
220K
R25
220K
LEFT RIGHT
TAPE RETURN R
TAPE RETURN LEFT
HUB INPUT SWITCHER
INPUT PCB - HUB PCB
SWITCHER DATA
SWITCHER CLOCK
SWITCHER STROBE
TAPE OUT R
INPUT 1
INPUT 2
INPUT 3
INPUT 4
INPUT 5
TAPE OUT L
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
U1
TC9163
6
7
8
RL1:C
RELAY
3
4
5
RL1:B
RELAY
HUB IN L
5
4
CN3:C
QUAD PHONO
R26
1K
R27
1K
R28
220K
R29
220K
INPUT 6
INPUT 7
2
1
CN4:A
QUAD PHONO
6
7
8
RL2:C
RELAY
6
7
8
RL3:C
RELAY
6
7
8
RL4:C
RELAY
6
7
8
RL5:C
RELAY
6
7
8
RL6:C
RELAY
6
7
8
RL7:C
RELAY
6
7
8
RL8:C
RELAY
INPUT R
6
CN3:D
QUAD PHONO
R30
220K
R31
1K
3
CN4:B
QUAD PHONO
R32
220K
R33
1K
INPUT 1
INPUT 2
INPUT 3
INPUT 4
INPUT 6
INPUT 7
INPUT 5
3
4
5
RL2:B
RELAY
3
4
5
RL3:B
RELAY
3
4
5
RL4:B
RELAY
3
4
5
RL5:B
RELAY
3
4
5
RL6:B
RELAY
3
4
5
RL7:B
RELAY
3
4
5
RL8:B
RELAY
3
CN5:B
QUAD PHONO
INPUT L
5
4
CN5:C
QUAD PHONO
6
CN5:D
QUAD PHONO
PREAMP OUT L
PREAMP OUT R
2
1
CN5:A
QUAD PHONO
3
2
1
8 4
U14:A
NE5532
5
6
7
U14:B
NE5532
R57
20K
R58
20K
R59
10K
R60
10K
R61
20K
R62
20K
R63
10K
R64
10K
C4
100nF
C5
22pF
C6
22pF
C7
22pF
C8
22pF
HUB IN L HUBIN L
HUB IN R
+5V
LOGIC GND
INPUT ONE LEFT +
INPUT ONE LEFT -
GND
GND
INPUT ONE RIGHT +
INPUT ONE RIGHT -
INPUT 1 L-
INPUT 1 L+
INPUT 1 R-
INPUT 1 R+
GND
INPUT 1 L-
INPUT 1 L+
INPUT 1 R-
INPUT 1 R+
R22
100R
R34
100R
3
2
1
8 4
U2:A
NE5532
R35
100K
R36
1K
R37
1K
3
2
1
8 4
U4:A
NE5532
R38
100K
C13
47pF
C14
47pF
C15
47pF
C22
47pF
C23
47pF
C24
47pF
C25
47pF
C26
47pF
C27
47pF
C28
47pF
C29
47pF
C30
47pF
C31
47pF
PREAMP OUT
PREAMP OUT
C32
47pF
+15V
-15V -15V
+15V
3
2
1
8 4
U3:A
NE5532
R42
100k
R43
47K
5
6
7
U3:B
NE5532
R44
47K
R45
100K
3
2
1
8 4
U5:A
NE5532
R40
100K
R41
47K
5
6
7
U5:B
NE5532
R46
47K
R47
100K
+15V
-15V
C38
10U NP 35V
C36
10U NP 35V
C39
10U NP 35V
C41
10U NP 35V
C45
10U NP 35V
C46
10U NP 35V
C47
10U NP 35V
3
2
1
8 4
U6:A
NE5532
5
6
7
U6:B
NE5532
3
2
1
8 4
U7:A
NE5532
5
6
7
U7:B
NE5532
3
2
1
8 4
U8:A
NE5532
5
6
7
U8:B
NE5532
R55
47K
R56
47K
R65
47K
R66
100K
R67
100K
R68
100K
+15V
-15V
C51
10U NP 35V
C52
10U NP 35V
C53
10U NP 35V
R69
100K
R70
100K
R71
100K
R72
47K
R73
47K
R74
47K
+15V
+15V
+15V
-15V
-15V
-15V
C60
10U NP 35V
3
2
1
8 4
U18:A
NE5532
R76
100K
R77
47K
5
6
7
U18:B
NE5532
C62
10U NP 35V
R78
100K
R79
47K
-15V
+15V
HUB 1L
HUB 2L
HUB 3L
HUB 4L
HUB 5L
HUB 6L
HUB 7L
HUB 1R
HUB 2R
HUB 3R
HUB 4R
HUB 5R
HUB 6R
HUB 7R
HUB 1L
HUB 2L
HUB 3L
HUB 4L
HUB 5L
HUB 6L
HUB 7L
HUB 1R
HUB 2R
HUB 3R
HUB 4R
HUB 5R
HUB 6R
HUB 7R
+15V
-15V
J1
TERMINAL
GROUND TERMINAL
3
2
1
8 4
U9:A
NE5532
R75
100K
R80
47K
-15V
+15V
TAPE RETN R
5
6
7
U9:B
NE5532
R81
100K
R82
47K
TAPE RETN L
C69
10U NP 35V
C70
10U NP 35V
TAPE RETN L TAPE RETN R
HUB IN R
1
2
3
4
5
6
CN10
JST 2,5MM B6B-XH-A
GND
1
2
3
4
5
6
7
8
9
10
CN6
FFC 10WAY
C68
10U 16V NP
C61
10U 16V NP
C50
10U 16V NP
C49
10U 16V NP
C48
10U 16V NP
C42
10U 16V NP
C40
10U 16V NP
C77
10U 16V NP
C37
10U 16V NP
C35
10U 16V NP
C57
10U 16V NP
C58
10U 16V NP
C59
10U 16V NP
C63
10U 16V NP
C66
10U 16V NP
C11
10U 16V NP
C12
10U 16V NP
C71
10U 16V NP
+5V POWER TO HUB
P1
PAD
R85
100R
C72
100nF 100V
C16
47N PE 63V
C17
47N PE 63V
C34
47N PE 63V
C33
47N PE 63V
C43
47N PE 63V
C44
47N PE 63V
C54
47N PE 63V
C55
47N PE 63V
C56
47N PE 63V
C64
47N PE 63V
C67
47N PE 63V
To enhance viewing, please print to A3 13

Cambridge Audio Azur 840A Amplifier
AP16361/3 Input PCB Schematic (Input Control)
1
2
RL1:A
RELAY
1
2
RL2:A
RELAY
1
2
RL3:A
RELAY
1
2
RL4:A
RELAY
1
2
RL5:A
RELAY
1
2
RL6:A
RELAY
1
2
RL7:A
RELAY
IN1
1
IN2
2
IN3
3
IN4
4
IN5
5
IN6
6
IN7
7
GND
8
COM
9
OUT7
10
OUT6
11
OUT5
12
OUT4
13
OUT3
14
OUT2
15
OUT1
16
U16
ULN2003A
+9V
+9VLOGIC GND
INPUT 1 INPUT 2 INPUT 3 INPUT 4 INPUT 5 INPUT 6 INPUT 7
1
2
RL8:A
RELAY
TAPE MONITOR
Q1
BC337
D1
1N4001
R11
10K
INPUT PCB - PREAMP PCB
TO PREAMP LEFT
TO PREAMP RIGHT
+15V
-15V
+5V
+9V LOGIC GND
PREAMP OUT L
PREAMP OUT R
C65
100nF 100V
LOGIC GND
+5V
LOGIC GND
1
2
3
4
5
6
7
8
CN8
FFC 08WAY
FROM FRONT PANEL PCB
1
2
3
4
5
6
CN9
JST 2,5MM B6B-XH-A
1
2
3
4
5
6
7
8
CN7
FFC 08WAY
To enhance viewing, please print to A3 14

Cambridge Audio Azur 840A Amplifier
AP16361/3 Input PCB Schematic (Input Amplifier)
TO PREAMP RIGHT
TO PREAMP LEFT
5
6
7
U2:B
NE5532
5
6
7
U4:B
NE5532
C18
22p
C19
22p
R48
1k
R49
1k
R50
1k
R51
1k
R52
100K
R53
100K
R54
100K
INPUT AMPLIFIER
+6dB
INPUT L
INPUT R
C9
1000uF 10V EL
C10
1000uF 10V EL
R39
100K
R83
47R
R84
47R
C21
10U 16V NP
C20
10U 16V NP
+15V
-15V
+15V
-15V
D2
1N4001
To enhance viewing, please print to A3 15

Cambridge Audio Azur 840A Amplifier
AP16361/3 Input Board PCB Board Layout (Top Side)
AP16362/3
INPUT 1
INPUT 2
INPUT 4
R32
L
R
RL1
L
R
L
R
L
R
RL2
R21
R5
U1
R12
R1
R2
R3
R4
R15
RL3 RL4
R13
U14
R57 R58
R59
R60
R61 R62
R63
R64
R6
R20
INPUT 5
INPUT 6
INPUT 7
TAPE OUT
R
L
R
L
R
L
R
L
R
L
R
TAPE RETURN
PREAMP OUT
RL5 RL6 RL7
RL8
R7
R30
R28
R29
R24
R25
R19
R16
R17
R18
R10
R31
R33
C1
U4
R53
R52
R54
R48
R49
R50
R51
C18
C19
C16
C17
C2
C5
C6
C3
R23
C4
C7
C8
R11
U16
R8
R26
R27
R22
C13
C14
R37
R36
R9 U2
R38
R35
R39
C15
C22
C23
C24
C25
C26
C27
C28
C29
C30
C31
C32
C33
C34
R42 C38
R44
R45 C39
R43
U3
R41
C36
C41
U5
R46
R40
R47
C43 C44
L
C51
C52
C45
C46
C47
C53
C60
C62
U7
U8
U6
U18
C54 C55 C56 C64
R67 R68
R66
R69
R70 R71
R72
R76 R78
R55
R56 R65
R73
R74 R77 R79
C65
AP16362/3
TO HUB PCB
HUB SWITCHER
RELAY DRIVER LOGIC
C11
C12
C20
C21
C35
C37 C40 C42 C48 C49 C50
C57 C58 C59 C61
C63
C66
C67
C68
C69
C70
C71
C77
CN6 CN7
CN8
CN9
CN10
R14
R75
R80
R81
R82
R83
R84
U9
C9
C10
TO PREAMP PCB CN11
CN9 TO PREAMP PCB
R34
J1
Q1
D1
FROM FRONT PANEL PCB
INPUT 3
C72 P1
R85
CN1
CN2
CN3
CN4
CN5
To enhance viewing, please print to A3 16

Cambridge Audio Azur 840A Amplifier
AP16361/3 Input Board PCB Board Layout (Bottom Side)
To enhance viewing, please print to A3 17

AP16364/3
setoNtnedItnenopmoCytQepyT/noitpircseDeulaVoNPA
RESISTORS
48R,38R,41R,3R4mliFlateMW521.0R74
58R,43R,32R,22R,91R,
9R6mliFlateMW521.0R001
81mliFlateMW521.0K1 R4, R5, R8, R10, R15-R18, R26, R27,
R31, R33, R36, R37, R48-R51
46R,36R,06R,95R,11R5mliFlateMW521.0K01
26R,16R,85R,75R4mliF
lateMW521.0K02
31mliFlateMW521.0K74 R41, R43, R44, R46, R55, R56, R65,
R72-R74, R77, R79, R80, R82
02mliFlateMW521.0K001 R35, R38-R40, R42, R45, R47, R52-
R54, R66-R71, R75, R76, R78, R81
41mliFlateMW521.0K022 R1, R2, R6, R7, R12, R13, R20, R21,
R24, R25, R28-R30, R32
CAPACITORS
91C,81C,8C-5C6mm3=
hctiP%01V05cimareCFp22
23C-22C,51C-31C41mm3=hctiP%01V05cimareCFp74
11mm5=hctiPretseyloP%01V36Fn74 C16, C17, C33, C34, C43, C44, C54
-
C56, C64, C67
27C,56C,3C,4C,2C,1C6mm5=hctiP%01V05cimareCFn001
10uF 16V Non Polarised Electrolytic Radial
(5.2mm) Pitch= 2.5mm 20
C11, C12, C20, C21, C35, C37 C40,
C42, C48-C50, C57-C59, C61, C63,
C66, C68, C71, C77
10uF 35V Non Polarised Electrolytic Radial
(5.2mm) Pitch= 2.5mm 14 C36, C38, C39, C41, C45-C47, C51-
C53, C60, C62, C69, C70
1000uF 10V Electrolytic Radial (10mm) Pitch=
5mm 2 C9, C10
SEMICONDUCTORS
egakcaP82POS1U1yarrAhctiwSeugolanAFA
3619CT674YP
PY1162 NE5532 Low Noise Dual Audio Op-Amp (SMT) 10 U3, U5-U9, U18, U2, U4, U14 SO8 Package
egakcaP61LID61U1srevirDnotgnilraD7A3002NLU8511YP
TRANSISTORS
egakcaP29OT1Q1langiSllamSNPN52-733CB412Y
P
DIODES
14OD1D1edoiD1004N1
MISCELLANEOUS
5NC-1NC5ONOHPTEKCOSONOHPDAUQ
01NC,9NC2redaehlacitreVA-HX-B6BMM5.2TSJ Input 1 audio conn,
i/o conn
8NC,7NC280-
VSS-001DYAW-8CFF0411YP Vertical FFC conn,
reverse-needle type
6NC101-VSS-001DYAW-01CFF3411YP Vertical FFC conn,
reverse-needle type
8LR-1LR8CDV99-2-EMYALER
Cambridge Audio Azur 840A Amplier Input PCB BOM
Note: resistors and other 'generic' electronic components are not usually stocked by the
manufacturer. Please obtain these locally.
18

Cambridge Audio Azur 840A Amplifier
AP16365/4 Preamp PCB Schematic (Relay Logic)
1
2
RL1:A
RELAY
1
2
RL2:A
RELAY
1
2
RL3:A
RELAY
1
2
RL4:A
RELAY
1
2
RL5:A
RELAY
1
2
RL6:A
RELAY
1
2
RL7:A
RELAY
1
2
RL8:A
RELAY
+9V
+9V
RSW1
RSW2
R
L
GND
LSW1
LSW2
2
4
3
1
7
8
5
CN1
HEADPHONE JACK
+5V
TIP = LEFT
RING = RIGHT
PHONES DETECT
PHONES GND
VOL1 VOL2 VOL3 VOL4 VOL5 VOL6 VOL7 VOL8
IN1
1
IN2
2
IN3
3
IN4
4
IN5
5
IN6
6
IN7
7
GND
8
COM
9
OUT7
10
OUT6
11
OUT5
12
OUT4
13
OUT3
14
OUT2
15
OUT1
16
U4
ULN2003A
IN1
1
IN2
2
IN3
3
IN4
4
IN5
5
IN6
6
IN7
7
GND
8
COM
9
OUT7
10
OUT6
11
OUT5
12
OUT4
13
OUT3
14
OUT2
15
OUT1
16
U5
ULN2003A
+9V
1
2
RL9:A
RELAY
1
2
RL10:A
RELAY
1
2
RL11:A
RELAY
VOL 9 VOL 10 VOL 11
1
2
RL12:A
RELAY
1
2
RL13:A
RELAY
1
2
RL14:A
RELAY
VOL 12 VOL 13 VOL 14
+9V
INPUT PCB - PREAMP PCB FRONT PCB - PREAMP PCB
AC
+15V
-15V
+5V
+9V
LOGIC GND
+5V
LOGIC GND
IR RX
PHONES DETECT
OVERLOAD
CLIP DETECT
DC OFFSET
MAINS FAIL
HIGH VOLUME
LOW VOLUME
EL
B
ACE
L
BAC
R19
100K
LOGIC GND
ON/STBY LED CONTROL
ON/STBY LED
R20
430R
LOGIC GND
R21
430R
PHONES R
PHONES L
IN1
1
IN2
2
IN3
3
IN4
4
IN5
5
IN6
6
IN7
7
GND
8
COM
9
OUT7
10
OUT6
11
OUT5
12
OUT4
13
OUT3
14
OUT2
15
OUT1
16
U7
ULN2003A
+9V
1
2
RL15:A
RELAY
1
2
RL16:A
RELAY
1
2
RL17:A
RELAY
BAL L BAL R BAL1
HI = PHONE JACK OUT
1
2
RL18:A
RELAY
BAL 2
MAINS ON/OFF RELAYINRUSH RELAY
+5V
3
OPT
1
GND
2
U10
TSOP18 IR RX
C19
100n ceramic
IR RECEIVER
TSOP1836/37
+5V
LOGIC GND
IR RX
1
2
RL19:A
RELAY
BAL 3
R100
22K
R104
47R
C20
10U 16V
C27
100n ceramic
+5V
LOGIC GND
C28
100n ceramic
C29
100n ceramic
ULN2003 DECOUPLERS
ON/STBY LED
LOGIC GND
LOGIC GND
LOGIC GND
1
2
3
4
5
6
7
8
CN6
CONN-H8
1
2
3
4
5
6
7
8
CN8
CONN-H8
1
2
3
4
5
6
7
8
CN9
CONN-H8
XD ON/OFF
OUTPUT RELAY A
OUTPUT RELAY B
SHIFT REGISTER CONNECTOR
SHIFT REGISTER CONNECTOR
SHIFT REGISTER CONNECTOR
LO = MAINS ON
1
2
3
4
5
6
7
8
9
10
11
12
CN2
CONN FFC-12
+15V
OVERTEMP
1
2
3
4
5
6
7
8
CN11
CONN FFC-8
FROM FRONT PANEL PCB
FROM FRONT PANEL PCB
FROM FRONT PANEL PCB
SPEAKER TEST
Q1
BC337
Q2
BC337
R83
22K
R110
10K
+5V
R111
4K7
To enhance viewing, please print to A3 19

Cambridge Audio Azur 840A Amplifier
AP16365/4 Preamp PCB Schematic (Tone Control)
R1
4K7
R2
1K1
R3
1K1
R4
2K2
R5
2K2
C2
680n poly
C3
10pF
SW1:B
SW-DPDT
DEFEAT
-15V
+15V
R6
4K7
R7
1K1
R8
1K1
R9
2K2
R10
2K2
C5
680n poly
C6
10p
SW1:A
SW-DPDT
DEFEAT
5
6
7
U1:B
NE5532
3
2
1
84
U2:A
NE5532
R11
47k
R12
47k
R13
47k
R14
47k
4
6
5
VR1:B
ALPHA RD902PF
13
2
VR1:A
ALPHA RD902PF
46
5
VR2:B
ALPHA RD902PF
1
3
2
VR2:A
ALPHA RD902PF
TONE CONTROL
TREBLE
BASS
TREBLE
BASS
3
2
1
84
U1:A
NE5532
5
6
7
U2:B
NE5532
R15
2K2
R16
2K2
R17
2K2
R18
2K2
TO VOLUME LEFT
+15V
-15V
6
7
8
RL19:C
RELAY
R22
150R
R105
2K2
R86
390R
R87
2K2
R88
1K
R89
2K2
3
4
5
RL17:B
RELAY
3
4
5
RL18:B
RELAY
3
4
5
RL19:B
RELAY
6
7
8
RL18:C
RELAY
6
7
8
RL17:C
RELAY
6
7
8
RL16:C
RELAY
R90
150R
R91
2K2
R92
390R
R93
2K2
R94
1K
R95
2K2
2.5 dB 3.75 dB 5.5 dB
BALANCE CONTROL
+15V
-15V
R85
390R
R96
390R
R97
150R
R98
150R
3
4
5
RL15:B
RELAY
6
7
8
RL15:C
RELAY
5
6
7
U9:B
NE5532
TO VOLUME RIGHT
3
2
1
84
U9:A
NE5532
3
4
5
RL16:B
RELAY
R99
47K
R101
47K
R102
47K
R103
47K
BALANCE BUFFER
LEFT
RIGHT
PREAMP OUT L
PREAMP OUT R
1
2
3
4
5
6
CN3
JST 2,5MM B6B-XH-A
C18
10U NP 16V
C24
10U NP 16V
C10
470U 10V EL
C12
470U 10V EL
C9
470U 10V EL
C11
470U 10V EL
C21
1000U 10V EL
C25
1000U 10V EL
C8
47N PE 63V
C13
47N PE 63V
C14
47N PE 63V
C15
47N PE 63V
C22
47N PE 63V
C36
100pF
C37
100pF
C38
1N PE 63V
C1
1N5 PE 63V
C4
1N5 PE 63V
C39
1N PE 63V
P1
PAD
GROUND REINFORCE
To enhance viewing, please print to A3 20