SERVICE MANUAL

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)
AP19597/1
Gallery Court Hankey Place London SE1 4BB UK
Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233
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.
© 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
840A Block Diagram
5
Cambridge Audio Azur 840A Amplifier
6
2
15
9
10
1
12
16
17
3
15
11
6
5
8
7
4
To enhance viewing, please print to A3
18
5
14
840A Exploded Diagram
13
6
9
10
11
12
13
14
15
16
17
18
PY1135
PY1136
PY1138
PY1139
PY1159
PY1153
PY1146
PY1163
PY1155
PY1145
PY1137
PY1134
PY1165
PY1118
PY1019
PY1020
PY1119
PY1120
PY1121
PY1123
PY1122
PY1124
PY1125
PY1126
PY1127
PY1128
PY1129
PY1130
PY1131
PY1132
PY1133
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
AP Part
Number
Drawing
Ref:
Speaker Binding Post BP331 (Black) Red & Black
Toroid 230V/50Hz 36.5VACx4 5.5A TI-053044C
Toroid 115V/50Hz 36.5VAC 5.5A TI-0853045C for 840A
Toroid 230V/50Hz 7.5VAC750MA 17VAC*2 TO7405B STB
Toroid 115V/50Hz 7.5VAC750MA 17VAC*2 STB
840A Bass / Treble Knob (Black) Painted Black
840A Bass / Treble Knob (Silver) Painted Silver
Azur 840A Plastic Foot (Black) AP16837*
Azur 840A Plasitc Foot (Silver) AP16837*
Azur 840A Top Panel Black Painted
Azur 840A Top Panel Silver
Azur 840A Side Panel, Black Painted
Azur 840A Side Panel,Silver
Azur 840A Black Front Panel Assy
Azur-840A Silver Front Panel Assy
Azur 840-A B Front Panel Artwork AP186371/186381 (Metalwork Only)
Azur 840-A Silver Front Panel Artwork AP186371/186381 (Metalwork Only)
Azur 840A Volume Knob Plastic Insert (AP1743*)
Azur 840A Volume Knob Skin, Black
Azur 840A Volume Knob Skin, Silver
LCD Display Highly Transflective DC00003E02 840A
Azur 840A Display Backlight (AP16841*)
Rotary Encoder Switch REBG161(9*7)PVB20FHINB1-2-24E
Azur-840A AMP-Hub Control PCB Assy Rev A
Azur-840A Amp Input PCB Assy Rev A
Azur-840A EU/UK PSU Power Control PCB Assy Rev A
Azur-840A Main-Amp Left PCB Assy Rev A
Azur-840A Main-Amp Right PCB Assy Rev A
Azur-840A Pre-Amp Board Rev A
Azur-840A Amp-Rectifier PCB Rev A
Azur-840A Amp Front Control PCB Assy Rev A
Azur-840A LCD Display Board Assy Rev A
Azur-840A Remote Control Assy Rev A
Description
Exploded Diagram Parts List
All spare parts should be ordered from AP Hong Kong office
3110-840000E000
6600-990112E000
2409-010200E001
9484-015000E041
9484-015000E341
9484-015000E141
9484-015000E091
9484-015001E091
9484-015000E331
9484-015000E071
9484-015000E111
9484-015000E061
9805-084000E001
6074-150005E000
6574-150015E000
6574-150012E000-01
2331-004909E301
3200-053044E000
3200-053045E000
3200-074051E001
3200-077811E000
6074-150003E000-01
6074-150003E001A01
6074-150004E000
6074-150004E000A01
6574-150009E000-01
6574-150009E000-02
6574-150013E000-01
6574-150013E000A01
8584-015010E301
Factory Ref:
Cambridge Audio Azur 840A Amplifier
7
Cambridge Audio Azur 840A Amplifier
+5V
COL 1
SW1
COL 2
SW2
SW-TACT
SW-TACT
COL 3
SW3
+5V
COL 4
SW4
ON/STBY LED
R12
10K
2K2
INPUT 1
SW-TACT
INPUT 2
ROW 1
INPUT 4
CN1
D2
SW-TACT
INPUT 3
1
2
3
4
5
6
7
8
9
10
11
12
LOGIC GND
BLUE LED
K
R11
+15V
A
+15V
RS232 RX
SPEAKER TEST
SERIAL RX 232
RS232 TX
Q3
R9
SW6
SW5
Q4
SW8
SW7
R13
BC337
SERIAL TX 232
22K
22K
D3
BC337
1N4002
RS232 RX
SW-TACT
SW-TACT
SW-TACT
INPUT 5
INPUT 6
INPUT 7
SW9
SW10
SW11
SW-TACT
SW-TACT
SW-TACT
SW-TACT
ROW 2
TAPE MON
PHONES DETECT
OVERLOAD
CLIP DETECT
DC OFFSET
OVER TEMP
MAINS FAIL
POSITION FOR
RS232 TX
LOGIC GND
C19
R5
MODE
spare
SPEAKER SELECT
ON/STBY
100n
1
2
3
4
5
6
7
8
15
100nF
LCD DECOUPLE
16
9
10
LCD DISPLAY CONN
LOGIC GND
SHIFT REG DECOUPLE
SPEAKER TEST
SHIFT REG ENABLE
Q0
D
Q1
CLK
Q2
STB
Q3
OE
2
3
1
15
SERIAL DATA
SERIAL CLOCK
X1
C6
Q4
LOGIC GND
R15
Q5
Q6
22pF
IR CONTROL
LOGIC GND
QS
+5V
QS
74HC4094
VDD=+5V
VSS=LOGIC GND
CRYSTAL
FREQ=20MHz
10K
U2
Q7
MCLR/VPP
RB7/PGD
RA0/AN0
RB6/PGC
RA1/AN1
RB5
RA2/AN2
RB4
RA3/AN3/VREF
RB3/PGM
RA4/T0CKI
RB2
RA5/AN4/SS
RB1
RE0/RD/AN5
RB0/INT
RE1/WR/AN6
VDD
RE2/CS/AN7
VSS
VDD
RD7/PSP7
VSS
RD6/PSP6
OSC1/CLKIN
RD5/PSP5
OSC2/CLKOUT
RD4/PSP4
RCO/T1OSO/T1CKI RC7/RX/DT
RC1/T1OSI/CCP2
RC6/TX/CK
RC2/CCP1
RC5/SDO
RC4/SDI/SDA
RC3/SCK/SCL
BLOCK
PIC TX
RD0/PSP0
RD3/PSP3
RD1/PSP1
RD2/PSP2
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
100pF
100n
100pF
100n
PIC16F877A
CLIP DETECT
OVERLOAD
+5V
OVER TEMP
DC OFFSET
MAINS FAIL
PHONES DETECT
SERIAL RX 232
SERIAL TX 232
SERIAL DATA
SERIAL CLOCK
SERIAL STROBE
R24
C10
C3
C1
10R
A SW
B SW
C GND
FIX1
FIX2
NOBLE16ENCODER
C11
100n CER
LOGIC GND
FRONT PANEL GND
LOGIC GND
IR IN (FROM JACK & PHONO ON HUB PCB)
SERIAL CONTROL OUT
PORT B HAS WEAK PULLUPS
RB4-RB7 HAS INTRPT ON CHANGE
HUB DATA
SERIAL IN FROM A-BUS HUB BOARD
HUB CLOCK
PROGRAM_CLOCK
PROGRAM_DATA
MCLR HUB
R3
R19
Q6
Programming Signals
To ABUS Hub PIC
10K
BC337
1
PGM
2K2
CCW
LOGIC GND
PR1
C23
3
R1
22R
D7
D4
10U 16V
Q1
CW
1N4148
1N4148
R6
R4
1K1
4K7
BC327-25
D8
C24
D5
1K1
R8
Q2
BC337
1N4148
1N4148
PAD
R17
P3
47R
0 = BRIGHT
10R
R16
PAD
TRISTATE= OFF
BC337
Q5
1= DIM
LOGIC GND
R18
2K2
FRONT PANEL GND
LOGIC GND
FRONT PANEL GROUNDING
TRISTATE LED CONTROL
To enhance viewing, please print to A3
RS232 TX
RS232 RX
C9
P2
10K
D6
BZX79C2V7 500MW
LOGIC GND
100N CERAMIC
100N CERAMIC
CW
2
15
1
2
3
4
5
10U 16V
100n
R7
PRESET 20K 3296W
LCD CONN ORIENTATION FROM FRONT
10R
100n CER
2K2
LED BACKLIGHT POWER
16
100n
ROT1
R23
BC327-25
R2
1
22pF
SHIFT REG ENABLE
43R
2
C5
E
Q8
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
C4
LCD DATA SHIFT REGISTER
CONN-8 DUAL BOT
100n
U1
10U 16V
4
5
6
7
14
13
12
11
FFC 12WAY
IR IN (FROM RECEIVER ON PREAMP BOARD)
10K
2
CN2
C22
PIC INPUT EMC CAPS
C7
RS
1a
2a
3a
4a
5a
6a
7a
8a
C17
ROW 3
R14
LOGIC GND
1
C16
+5V
100nF
LOGIC GND
100nF
C15
LOGIC GND
C20
+5V
C2
C21
CONNECTOR TO PREAMP PCB
+5V
100R
C18
EXTRA SWITCH
LOGIC GND
AP16369/3 Front Panel PCB Schematic (Microcontroller & LCD)
PGM
MCLR HUB
PROGRAM_DATA
PROGRAM_CLOCK
BLOCK
PIC TX
LOGIC GND HUB DATA
HUB CLOCK
R10
1
2
3
4
5
6
7
8
9
10
11
12
13
TX
RX
RS232 GND
IR IN
IR GND
CN3
FFC 13WAY
RS232 & IR CABLE TO HUB PCB
SERIAL IN FROM A-BUS HUB BOARD
8
Cambridge Audio Azur 840A Amplifier
U3
FROM SHEET 1
SERIAL DATA
SERIAL CLOCK
SERIAL STROBE
SHIFT REG ENABLE
2
3
1
15
CN4
D
Q0
CLK
Q1
STB
Q2
OE
Q3
Q4
Q5
Q6
Q7
QS
QS
4
5
6
7
14
13
12
11
1
2
3
4
5
6
7
8
TO PREAMP BOARD
FFC 08WAY
9
10
74HC4094
VDD=+5V
VSS=LOGIC GND
U4
2
3
1
15
D
CN5
Q0
CLK
Q1
STB
Q2
OE
Q3
Q4
Q5
Q6
Q7
QS
QS
+5V
4
5
6
7
14
13
12
11
1
2
3
4
5
6
7
8
TO PREAMP BOARD
FFC 08WAY
9
10
74HC4094
VDD=+5V
VSS=LOGIC GND
C8
C12
C13
C14
100nF
100nF
100nF
100nF
SHIFT REG DECOUPLE
U5
2
3
1
15
CN6
D
Q0
CLK
Q1
STB
Q2
OE
Q3
Q4
LOGIC GND
Q5
Q6
Q7
QS
QS
4
5
6
7
14
13
12
11
1
2
3
4
5
6
7
8
TO PREAMP BOARD
FFC 08WAY
9
10
74HC4094
VDD=+5V
VSS=LOGIC GND
U6
2
3
1
15
CN7
D
Q0
CLK
Q1
STB
Q2
OE
Q3
Q4
Q5
Q6
Q7
QS
QS
4
5
6
7
14
13
12
11
9
10
1
2
3
4
5
6
7
8
TO INPUT BOARD
FFC 08WAY
74HC4094
VDD=+5V
VSS=LOGIC GND
To enhance viewing, please print to A3
AP16369/3 Front Panel PCB Schematic (Shift Registers)
9
Cambridge Audio Azur 840A Amplifier
D7
CN2
R14
C1
X1
SW3
C5
D6
C23
R16
R24
SW11
SW8
SW9
ROT1
P2
SW7
C6
SW10
Q2
SW2
Q1
C7
C10
SW6
U1
R15
D2
P3
R1
D5
SW5
C11
SW1
R18
U3
Q5
C24
C8
U4
R6
C12
R8
U5
D4
C14
U6
C3
R17
R4
R3
R7
D8
Q8
C13
R5
C2
U2
C17
C15
C18
R12
R2
C20
C4
C16
Q6
R19
C19
C22
C21
Q4
R13
Q3 C9
R10
R11
D3
R9
R23
SW4
(c) COPYRIGHT Audio Partnership PLC 2005
AP16370/3 AP16370/3
To enhance viewing, please print to A3
AP16369/3 Front Panel PCB Layout (Top Side)
10
Cambridge Audio Azur 840A Amplifier
To enhance viewing, please print to A3
AP16369/3 Front Panel PCB Layout (Bottom Side)
11
AP16372/5
Cambridge Audio Azur 840A Amplifier Front Panel PCB BOM
AP No
Value
Description/Type
Qty
Component Ident
Notes
RESISTORS
10R
22R
43R
47R
100R
1K1
2K2
4K7
10K
22K
CAPACITORS
22pF
100pF
0.25 W 1% Metal Film
0.25 W 1% Metal Film
0.25 W 1% Metal Film
0.25 W 1% Metal Film
0.25 W 1% Metal Film
0.25 W 1% Metal Film
0.25 W 1% Metal Film
0.25 W 1% Metal Film
0.25 W 1% Metal Film
0.25 W 1% Metal Film
3
1
1
1
1
2
4
1
5
2
R10, R23, R24
R1
R2
R16
R5
R6, R8,
R3, R7, R12, R18,
R4
R11, R14, R15, R17, R19
R9, R13
Ceramic 50V 10% Pitch=5mm
Ceramic 50V 10% Pitch=5mm
2
2
100nF
Ceramic 50V 10% Pitch=5mm
17
C5, C6
C15, C16
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 profile electrolytic
SEMICONDUCTORS
PIC16F877A - I/P
PIC Flash Microcontroller 40 pin DIL
1
U1
PY1100
74HC4094
TRANSISTORS
Shift register 16 pin DIL
5
U2 - U6
PY219
BC327-25
PNP Small Signal TO92
2
Q1, Q8
PY214
BC337-25
NPN Small Signal TO92
4
Q2, Q3, Q4, Q5
Contact Audio Partnership Service
Department
DIODES
BLUE LED
Blue LED 3mm UNI flat top
1
D2
1N4148
General purpose diode
4
D4,D5, D6,D7
B Z X 79C - 2V 7
Z ener diode 2V 7 400mW
1
D8
1N4002
General Purpose Rectifier
1
D3
1
CN1
1
CN3
4
CN4, CN5, CN6, CN7
400mW D O 35 C ase.
MISCELLANEOUS
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
PY1141
D100-SSV-12
PY1142
D100-SSV-13
PY1140
D100-SSV-08
PY1138
REB161(9x7)PVB20FHIN
Noble ROTARY ENCODER
B 1-2-24E
PY 043
2400- 020200- 000
T act switch
11
SW 1- SW 11
20MH z C RY ST AL
MULTITURN PRESET
20K
H C 49/4H
1
X1
Side adjust. Foot print 9.5 x 4.5 mm
1
PR1
1
ROT1
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
C6
C7
22pF
22pF
LEFT
U14:B
R57
6
INPUT 1 L-
7
5
INPUT 1 L+
INPUT 1
CN1:B
3
QUAD PHONO
R58
R22
C77
R3
R63
5
INPUT 1 L+
INPUT 1 L-
RELAY
10K
INPUT ONE RIGHT +
INPUT ONE RIGHT GND
GND
INPUT ONE LEFT +
INPUT ONE LEFT -
R61
CN1:A
HUB 1L
2
10K
1
C5 22pF
QUAD PHONO
3
6
22pF
RELAY
10U 16V NP
C4
100nF
R64
RL1:C
7
8
47R
20K
100R
C71
R14
1
R62
R34
RIGHT
-15V
U14:A
NE5532
2
INPUT 1 R+
INPUT 1
JST 2,5MM B6B-XH-A
R59
20K
INPUT 1 R-
10U 16V NP
20K
100R
4
3
47R
1
2
3
4
5
6
INPUT 1 R+
INPUT 1 R-
RL1:B
NE5532
20K
CN10
4
10K
8
R60
HUB 1R
+15V
10K
C8
INPUT 2
10U NP 35V
CN1:D
6
6
R4
INPUT 2
4
R45
47pF
100K
CN1:C
3
5
NE5532
C24
220K
RL2:B
C40
7
1K
R1
U3:B
5
C38
5
RELAY
4
10U 16V NP
QUAD PHONO
10U NP 35V
U3:A
RL2:C
NE5532
2
C37
HUB 2L
R44
47K
7
6
1
R15
8
3
RELAY
10U 16V NP
1K
C43
8
C39
4
-15V
R12
C32
R42
220K
47pF
100k
C3
R43
47N PE 63V
HUB 2R
GROUND TERMINAL
47K
100nF 100V
J1
R23
+15V
QUAD PHONO
100R
TERMINAL
C72
INPUT 3
C41
3
QUAD PHONO
10U NP 35V
6
R5
U5:B
1K
C23
47pF
INPUT 3
4
CN2:A
3
5
NE5532
R2
220K
RL3:B
C42
7
5
C36
2
RELAY
1
10U 16V NP
QUAD PHONO
10U NP 35V
U5:A
RL3:C
NE5532
2
C35
R47
HUB 3L
R46
100K
RELAY
10U 16V NP
C27
220K
6
8
3
1K
R13
47K
100nF 100V
7
1
R16
C44
8
CN2:B
4
-15V
47pF
R40
R41
47N PE 63V
P1
R85
PAD
100R
HUB 3R
47K
100K
+15V
C45
6
QUAD PHONO
10U NP 35V
6
R8
47pF
INPUT 4
4
CN2:C
3
5
5
NE5532
C22
220K
RL4:B
C48
7
1K
R6
U6:B
C51
5
RELAY
4
10U 16V NP
QUAD PHONO
10U NP 35V
U6:A
RL4:C
NE5532
2
C57
R66
HUB 4L
R55
100K
RELAY
10U 16V NP
C25
220K
6
8
3
1K
R20
47K
7
1
R17
C54
8
CN2:D
4
-15V
INPUT 4
47pF
R69
47N PE 63V
100K
R72
HUB 4R
47K
+15V
-15V
+15V
C1
C46
3
QUAD PHONO
10U NP 35V
6
R10
47pF
INPUT 5
4
CN3:A
3
5
5
NE5532
C15
220K
RL5:B
C49
7
1K
R7
U7:B
2
RELAY
1
10U 16V NP
QUAD PHONO
R67
R56
100K
47K
C52
10U NP 35V
HUB 5L
R21
7
6
8
3
HUB 1L
HUB 2L
HUB 3L
RELAY
10U 16V NP
1K
C55
C26
47pF
R70
47N PE 63V
100K
R73
HUB 4L
HUB 5L
HUB 6L
HUB 5R
47K
+15V
HUB 7L
TAPE RETN L
HUB IN L
C47
6
QUAD PHONO
10U NP 35V
6
R31
47pF
INPUT 6
4
CN3:C
3
5
NE5532
C14
220K
RL6:B
C50
7
1K
R30
U8:B
5
4
10U 16V NP
QUAD PHONO
R68
R65
100K
47K
C53
5
RELAY
10U NP 35V
U8:A
C59
HUB 6L
C28
220K
R-S1
L-S2
R-S2
L-S3
R-S3
L-COM1
R-COM1
R-S4
L-S4
L-S5
R-S5
R-S6
L-S6
L-COM2
L-S7
R-COM2
R-S7
L-S8
R-S8
L-COM3
ST
R-COM3
DATA
GND
CLK
28
27
26
25
24
23
22
21
20
19
18
17
16
15
HUB 1R
HUB 2R
HUB 3R
HUB 4R
HUB 5R
HUB 6R
HUB 7R
TAPE RETN R
CN6
47pF
C56
R71
+5V
LOGIC GND
R74
47N PE 63V
100K
HUB IN L
RELAY
10U 16V NP
1K
R28
Vdd
L-S1
HUB INPUT SWITCHER
6
8
Vss
HUB IN R
7
1
3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TC9163
RL6:C
NE5532
2
R26
8
CN3:D
4
-15V
INPUT 6
100n CER
U1
RL5:C
C58
1
R18
220K
100n CER
U7:A
NE5532
2
8
CN3:B
4
-15V
INPUT 5
C2
HUB 6R
47K
+15V
1
2
3
4
5
6
7
8
9
10
HUB IN L
HUB IN R
GND
GND
+5V POWER TO HUB
SWITCHER DATA
SWITCHER CLOCK
SWITCHER STROBE
FFC 10WAY
C60
3
QUAD PHONO
10U NP 35V
6
R33
47pF
INPUT 7
4
CN4:A
3
5
5
NE5532
C13
220K
RL7:B
C61
7
1K
R32
U18:B
2
RELAY
1
10U 16V NP
QUAD PHONO
R76
R77
100K
47K
C62
10U NP 35V
U18:A
RL7:C
NE5532
2
C63
R27
HUB 7L
INPUT PCB - HUB PCB
7
6
1
8
3
RELAY
10U 16V NP
1K
8
CN4:B
4
-15V
INPUT 7
R29
C29
R78
220K
47pF
100K
C64
R79
47N PE 63V
47K
HUB 7R
+15V
10U NP 35V
R24
220K
5
1K
R81
47pF
100K
3
QUAD PHONO
5
-15V
10U 16V NP
C31
TAPE RETURN R
4
3
C70
5
RELAY
10U NP 35V
R25
220K
C11
47N PE 63V
U2:A
CN4:C
QUAD PHONO
47K
U9:A
NE5532
2
R37
6
8
C30
R75
47pF
100K
R35
1
100K
3
100R
2
1
QUAD PHONO
8
+15V
C33
PREAMP OUT
INPUT R
CN5:D
RELAY
-15V
10U 16V NP
1K
C67
R80
47N PE 63V
47K
6
47N PE 63V
PREAMP OUT
C12
U4:A
CN5:C
10U 16V NP
5
4
NE5532
R19
PREAMP OUT L
QUAD PHONO
C16
+15V
CN5:A
7
3
TAPE OUT R
2
RL8:C
TAPE RETN R
C66
1
10U 16V NP
NE5532
R9
INPUT L
4
C34
R82
TAPE OUT L
CN5:B
RL8:B
TAPE RETN L
C68
7
4
QUAD PHONO
R36
NE5532
1
R38
3
100R
PREAMP OUT R
QUAD PHONO
2
100K
C17
+15V
8
6
6
8
C69
4
CN4:D
4
-15V
U9:B
TAPE RETURN LEFT
47N PE 63V
47N PE 63V
To enhance viewing, please print to A3
AP16361/3 Input PCB Schematic (Input Select)
13
Cambridge Audio Azur 840A Amplifier
+9V
INPUT PCB - PREAMP PCB
CN9
1
2
3
4
5
6
RL1:A
TO PREAMP LEFT
TO PREAMP RIGHT
PREAMP OUT L
PREAMP OUT R
+5V
RL2:A
RL3:A
RL4:A
RL5:A
RL6:A
1
1
1
1
1
1
2
2
2
2
2
2
2
RELAY
RELAY
RELAY
RELAY
RELAY
TAPE MONITOR
RL8:A
RL7:A
1
RELAY
RELAY
1
D1
2
1N4001
RELAY
JST 2,5MM B6B-XH-A
INPUT 1
INPUT 2
INPUT 3
INPUT 4
INPUT 5
INPUT 6
INPUT 7
C65
100nF 100V
CN7
LOGIC GND
1
2
3
4
5
6
7
8
+5V
+9V
LOGIC GND
CN8
+15V
-15V
FFC 08WAY
U16
1
2
3
4
5
6
7
8
FFC 08WAY
FROM FRONT PANEL PCB
1
2
3
4
5
6
7
8
IN1
OUT1
IN2
OUT2
IN3
OUT3
IN4
OUT4
IN5
OUT5
IN6
OUT6
IN7
OUT7
GND
COM
16
15
14
13
12
11
10
9
ULN2003A
LOGIC GND
+9V
R11
Q1
BC337
10K
LOGIC GND
To enhance viewing, please print to A3
AP16361/3 Input PCB Schematic (Input Control)
14
Cambridge Audio Azur 840A Amplifier
+15V
C21
INPUT L
U2:B
5
C9
7
10U 16V NP
R39
R54
100K
100K
R83
TO PREAMP LEFT
6
NE5532
1000uF 10V EL
R48
47R
C18
1k
22p
-15V
R49
1k
D2
1N4001
INPUT AMPLIFIER
+ 6 dB
+15V
INPUT R
C20
U4:B
5
C10
7
10U 16V NP
R53
R52
100K
100K
R84
TO PREAMP RIGHT
6
1000uF 10V EL
NE5532
47R
R50
1k
C19
22p
-15V
R51
1k
To enhance viewing, please print to A3
AP16361/3 Input PCB Schematic (Input Amplifier)
15
AP16362/3
Q1
D1
RL1
To enhance viewing, please print to A3
RL2
C3
RL3
U1
RL4
RL5
RL6
C72
AP16361/3 Input Board PCB Board Layout (Top Side)
R85 C12
C11
R84
C20
INPUT 6
INPUT 7
INPUT 4
INPUT 5
INPUT 2
INPUT 3
INPUT 1
TAPE RETURN
R30
R29
CN9
C10
C9
P1
C18
R35
R PREAMP OUT L
C34
R54
R49
R39
R53
C16
U2
C19
R52
CN5
R9
R48
R51
C67
R19
R50
C68
L
U4
TAPE OUT
C21
C17
CN9 TO PREAMP PCB
RL8
R38 R81
R
U9
C70 C69
C66
R82
L
R24
R
R36
R37
L
R80
R32
R33 C60
C64
C61
R25
R
C31
R75
R27
C63
U18
C62
R31 C47
C56
C50
C14
CN3
CN4
C33
C71
C30
C59
U8
L
C13
R7
R28
R26 C53
L
R76
R77
C29
C55
C49
R10
C5
2
R
R79
R78
C15
C28
C58
U7
R6
R
R18
C45
R
R68
R65
C54
C48
R8
C51
C41
L
R67
R56
R74
R71
C57
U6
R17
R20
R2
L
R70
C44
C42
C23 R5
L
R55 C22
R73 C26R21
C25
R16
CN1
CN2
R1
R13
R
R66
R47
R46
R72
R69
C35
U5
C36
R4 C39
C43
C40
C27 C24
R3
R
R41
R40
R45
R44
C37
U3
C38
R22
R15
C77
C5
C6
R63
C4
R60
C7
U14
C32 R12
R61
R62
L
C2
U16
R43
R42
R14
R59
C1
R11
C65
R57
R58
CN10
R64
FROM FRONT PANEL PCB
CN8
CN7
TO PREAMP PCB CN11
R
C8
6
CN6
R34
C4
TO HUB PCB
Cambridge Audio Azur 840A Amplifier
R83
RELAY DRIVER LOGIC
RL7
J1
HUB SWITCHER
R23
AP16362/3
16
Cambridge Audio Azur 840A Amplifier
To enhance viewing, please print to A3
AP16361/3 Input Board PCB Board Layout (Bottom Side)
17
AP16364/3
Cambridge Audio Azur 840A Amplifier Input PCB BOM
AP N o
V a lue
0. 125 W Metal Film
0. 125 W Metal Film
4
6
1K
0. 125 W Metal Film
18
10K
20K
0. 125 W Metal Film
0. 125 W Metal Film
5
4
47K
0. 125 W Metal Film
13
100K
0. 125 W Metal Film
20
220K
0. 125 W Metal Film
14
CAPACITORS
22pF
47pF
C er amic 50V 10% Pitch= 3mm
C er amic 50V 10% Pitch= 3mm
6
14
47nF
63V 10% Polyester Pitch= 5mm
11
100nF
C er amic 50V 10% Pitch= 5mm
6
10uF
16V Non Polarised Electrolytic Radial
(5.2mm) Pitch= 2.5mm
20
1000uF
PY 214
Q ty
RESISTORS
47R
100R
10uF
PY 476
PY1162
PY 1158
D e scr ipt ion/T ype
SEMICONDUCTORS
T C 9163AF
NE5532
U L N 2003A
TRANSISTORS
B C 337- 25
DIODES
1N 4001
MISCELLANEOUS
Q U AD PH O N O SO C K E T
35V Non Polarised Electrolytic Radial
(5.2mm) Pitch= 2.5mm
10V Electrolytic Radial (10mm) Pitch=
5mm
Analogue Switch Ar r ay
Low Noise Dual Audio Op-Amp (SMT)
7 D ar lington D r iver s
14
2
1
10
1
C o m po n e n t I d e n t
N ot e s
R3, R14, R83, R84
R9, R19, R22, R23, R34, R85
R4, R5, R8, R10, R15-R18, R26, R27,
R31, R33, R36, R37, R48-R51
R11, R59, R60, R63, R64
R57, R58, R61, R62
R41, R43, R44, R46, R55, R56, R65,
R72-R74, R77, R79, R80, R82
R35, R38-R40, R42, R45, R47, R52R54, R66-R71, R75, R76, R78, R81
R1, R2, R6, R7, R12, R13, R20, R21,
R24, R25, R28-R30, R32
C 5- C 8, C 18, C 19
C 13- C 15, C 22- C 32
C16, C17, C33, C34, C43, C44, C54 C56, C64, C67
C 1, C 2, C 4, C 3, C 65, C 72
C11, C12, C20, C21, C35, C37 C40,
C42, C48-C50, C57-C59, C61, C63,
C66, C68, C71, C77
C36, C38, C39, C41, C45-C47, C51C53, C60, C62, C69, C70
C9, C10
U1
U3, U5-U9, U18, U2, U4, U14
U 16
SO P28 Package
SO8 Package
D IL 16 Package
N PN Small Signal
1
Q1
T O 92 Package
D iode
1
D1
D O 41
PH O N O
5
C N 1- C N 5
JST 2. 5MM B 6B - X H - A
V er tical header
2
C N 9, C N 10
PY 1140
FFC 8- W AY
D 100- SSV - 08
2
C N 7, C N 8
PY 1143
FFC 10- W AY
D 100- SSV - 10
1
CN6
8
RL 1- RL 8
RE L AY ME - 2- 9 9V D C
Input 1 audio conn,
i/o conn
Vertical FFC conn,
reverse-needle type
Vertical FFC conn,
reverse-needle type
Note: resistors and other 'generic' electronic components are not usually stocked by the
manufacturer. Please obtain these locally.
18
Cambridge Audio Azur 840A Amplifier
A
C
C A B LE
INPUT PCB - PREAMP PCB
CN11
1
2
3
4
5
6
7
8
+5V
CA BL E
FRONT PCB - PREAMP PCB
CN2
+5V
+9V
LOGIC GND
CONN FFC-8
R104
47R
+5V
1
2
3
4
5
6
7
8
9
10
11
12
CONN FFC-12
+15V
-15V
+15V
SPEAKER TEST
ON/STBY LED
IR RX
LOGIC GND
PHONES DETECT
OVERLOAD
CLIP DETECT
DC OFFSET
OVERTEMP
MAINS FAIL
IR RX
U10
1
2
3
OPT
C20
C19
GND
+5V
10U 16V
100n ceramic
TSOP18 IR RX
IR RECEIVER
TSOP1836/37
+9V
LOGIC GND
RL1:A
SHIFT REGISTER CONNECTOR
FROM FRONT PANEL PCB
1
2
3
4
5
6
7
8
CONN-H8
IN1
OUT1
IN2
OUT2
IN3
OUT3
IN4
OUT4
IN5
OUT5
IN6
OUT6
IN7
OUT7
GND
COM
RL5:A
RL6:A
RL8:A
RL7:A
RL9:A
RL11:A
RL10:A
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
2
RELAY
VOL 1
U4
1
2
3
4
5
6
7
8
RL4:A
1
RELAY
CN6
RL3:A
RL2:A
1
RELAY
VOL 2
RELAY
VOL 3
RELAY
VOL 4
VOL 5
RELAY
RELAY
RELAY
VOL 6
VOL 7
VOL 8
RELAY
RELAY
RELAY
VOL 9
VOL 10
VOL 11
LOW VOLUME
16
15
14
13
12
11
10
9
ULN2003A
+9V
LOGIC GND
+9V
U5
CN8
1
2
3
4
5
6
7
8
SHIFT REGISTER CONNECTOR
FROM FRONT PANEL PCB
1
2
3
4
5
6
7
8
IN1
OUT1
IN2
OUT2
IN3
OUT3
IN4
OUT4
IN5
OUT5
IN6
OUT6
IN7
OUT7
GND
COM
16
15
14
13
12
11
10
9
RL13:A
RL12:A
1
1
2
2
RELAY
2
RELAY
VOL 12
ULN2003A
RL14:A
1
RELAY
VOL 13
VOL 14
HIGH VOLUME
CONN-H8
RL15:A
1
2
RL16:A
RL18:A
RL17:A
1
1
1
2
2
2
RELAY
RELAY
RELAY
RELAY
BAL L
BAL R
BAL1
BAL 2
RL19:A
1
2
RELAY
BAL 3
+5V
CN1
8
RSW1
+9V
LOGIC GND
7
PHONES R
RSW2
R
3
U7
CN9
SHIFT REGISTER CONNECTOR
FROM FRONT PANEL PCB
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
IN1
OUT1
IN2
OUT2
IN3
OUT3
IN4
OUT4
IN5
OUT5
IN6
OUT6
IN7
OUT7
GND
COM
+5V
16
15
14
13
12
11
10
9
LO = MAINS ON
ON/STBY LED
R111
PHONES L
2
L
4
4K7
LSW2
5
INRUSH RELAY
+5V
MAINS ON/OFF RELAY
R100
R83
22K
R21
R20
430R
430R
LSW1
GND
1
22K
ULN2003A
HEADPHONE JACK
+9V
CONN-H8
PHONES GND
C27
LOGIC GND
C28
C29
R110
XD ON/OFF
100n ceramic
OUTPUT RELAY A
100n ceramic
100n ceramic
Q1
Q2
BC337
BC337
ON/STBY LED CONTROL
PHONES DETECT
R19
HI = PHONE JACK OUT
100K
10K
TIP = LEFT
RING = RIGHT
OUTPUT RELAY B
ULN2003 DECOUPLERS
LOGIC GND
To enhance viewing, please print to A3
LOGIC GND
AP16365/4 Preamp PCB Schematic (Relay Logic)
LOGIC GND
19
Cambridge Audio Azur 840A Amplifier
RL15:C
7
C9
1N PE 63V
SW-DPDT
DEFEAT
47k
5
150R
RL18:B
4
4
5
1N5 PE 63V
2K2
R4
4K7
2K2
1K
R103
47K
47K
LEFT
390R
R86
390R
C10
1
470U 10V EL
4
NE5532
R87
2K2
R89
2K2
2K2
R13
U1:A
47k
U1:B
5
ALPHA RD902PF
R105
2
4
VR2:B
R99
8
R15
2K2
6
1000U 10V EL
RELAY
R88
R16
3
10pF
5
R1
2K2
TO VOLUME LEFT
6
3
5
RELAY
150R
100pF
C3
C21
5
4
3
5
RELAY
R85
1K1
R5
5
R22
C36
R2
C1
RELAY
RL19:B
3
R3
U9:B
NE5532
10U NP 16V
7
RL17:B
47N PE 63V
1K1
C18
3
R97
C8
VR1:B
BASS
RELAY
4
+15V
ALPHA RD902PF
4
6
8
470U 10V EL
R11
TREBLE
6
SW1:A
RL15:B
C38
7
6
NE5532
2.5 dB
C2
CN3
3.75 dB
5.5 dB
-15V
680n poly
P1
1
2
3
4
5
6
BALANCE CONTROL
GROUND REINFORCE
PAD
BALANCE BUFFER
TONE CONTROL
PREAMP OUT L
PREAMP OUT R
+15V
JST 2,5MM B6B-XH-A
3
1N PE 63V
ALPHA RD902PF
1
SW1:B
2
R8
C4
1K1
3
5
7
C6
R6
R9
2K2
4K7
2K2
5
R17
C13
2K2
2
ALPHA RD902PF
3
BASS
47N PE 63V
8
1
VR2:A
U9:A
3
NE5532
6
8
RELAY
C25
U2:A
3
U2:B
C12
R90
7
RELAY
6
NE5532
R94
R96
150R
1000U 10V EL
R101
R102
47K
RIGHT
1K
390R
470U 10V EL
C22
-15V
R14
R92
47k
390R
TO VOLUME RIGHT
1
2
47K
10p
+15V
8
RELAY
10U NP 16V
7
6
6
8
2K2
RELAY
RL19:C
7
R18
1N5 PE 63V
R10
RL18:C
RL17:C
100pF
C24
4
R98
150R
R7
1K1
RELAY
RL16:B
SW-DPDT
DEFEAT
R12
47k
47N PE 63V
6
8
470U 10V EL
C37
VR1:A
C15
7
4
TREBLE
RL16:C
C11
8
C39
47N PE 63V
1
2
NE5532
680n poly
4
C5
C14
R91
R93
R95
2K2
2K2
2K2
47N PE 63V
-15V
To enhance viewing, please print to A3
AP16365/4 Preamp PCB Schematic (Tone Control)
20
Cambridge Audio Azur 840A Amplifier
+15V
C31
R106
PREAMP OUT L
470R
47U NP 25V
R107
C23
100nF ceramic
47K
8
C35
47N PE 63V
C16
-15V
U12:A
3
10U NP 16V
CN10
R81
1
VOL OUT LEFT
2
1
2
220R
R77
NE5532
AUDIO TO L POWER AMP
4
JST 2.5MM B2B-XH-A
47K
100nF ceramic
R76
+9V
+5V
390R
P2
PREAMP PCB - POWER AMP LEFT PCB CONNS
C26
390R
R75
-15V
CN4
LOGIC GND
PAD
GROUND REINFORCE
P3
HI = NORMAL
OVERTEMP
HI = NORMAL
DC OFFSET
HI = NORMAL
OVERLOAD
HI = NORMAL
CLIP DETECT
SPEAKER TEST
R84
PAD
C33
POST AMPLIFIER
18 pF
C34
47K
MAINS FAIL
OUTPUT RELAY A
OUTPUT RELAY B
D3
D1
1N4148
5V1
D2
1N4148
PHONES R
PHONES L
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
+15V
SPEAKER TEST
CLIP
OVERLOAD
DC OFFSET
OVERTEMP
XD ON/OFF
C30
+9V
+5V
FFC 16WAY
-15V
OPAMP DECOUPLING
LOGIC GND
LO = ON
CN5
10u 25V
10u 25V
PHONES GND
15 pF
C7
MAINS FAIL IN
LOGIC GND
MAINS FAIL IN
1
2
3
4
5
6
7
8
9
10
11
12
FFC 12WAY
XD ON/OFF
MAINS ON/OFF RELAY
INRUSH RELAY
U12:B
C17
5
R82
7
VOL OUT RIGHT
10U NP 16V
CN12
6
1
2
220R
R80
PREAMP PCB - PSU PCB CONN
AUDIO TO R POWER AMP
JST 2.5MM B2B-XH-A
NE5532
47K
R78
PREAMP PCB - POWER AMP RIGHT PCB CONN
390R
C32
R108
R79
390R
PREAMP OUT R
470R
47U NP 25V
R109
47K
To enhance viewing, please print to A3
AP16365/4 Preamp PCB Schematic (Post Amp)
21
Cambridge Audio Azur 840A Amplifier
RL3
RL2
RL4
RL5
RL6
RL7
U4
RL8
RL9
RL10
RL11
RL12
RL13
C2
U5
RL14
CN6
RL17
C5
RL16
U7
RL15
C38
R11
C24
C18
U10
AP16365/3 Preamp PCB Layout (Top Side)
C6
U2
R14
C37
C15
CN9
R99 C29
R94
U9
R92
R101
93
R
96
R8
8
R8
6
R
89
R
95
R85
R87
R
R
9
R 7
R 22
10
5
R6
R8
C39
R91
R90
R98
R5
R7
C4
C3
R9
R16
C8
R17 C13
C21
C20
C14
C12
R18
R103
R10
C36
C25
SW1
R12
C9
R13
C11
R102
C30
P3
C1
VR1
R3
R4
R1
To enhance viewing, please print to A3
C23
C19
C7
U1
R47 R73
C10
R104
R78
R79
R80
R77
R76
R75
R19
R20
R83
R21
R111
Q2
R110
R82
U12
P2
R15
R72
R46
R69 R45 R48 R74
R71
R68
R70
R67
R43
R44
R41
R42
R66
R40
R38
R39
R65
R64
R36
R37
R63
R62
R59
R33
R34
R35
R61
R60
R58
R57
R31
R32
R56
R55
R29
R30
R27
R54
R53
R26 R52
C17
C34
R28
R24 R50
C33
R25
Q1
C27
C16
C26
CN1 PHONES
R51
R23
CN2
R49
CN10
R2
VR2
D3
R81
R100
RL19
C22
CN8
CN11
D2
R84
CN12
RL18
CN5
D1
C35
CN3
C32
RL1
CN4
C28
R108
R106
R107
R109
C31
P1
22
Cambridge Audio Azur 840A Amplifier
To enhance viewing, please print to A3
AP16365/3 Pre-amp PCB Layout (Bottom Side)
23
AP16368/4
Cambridge Audio Azur 840A Amplifier Preamp PCB BOM
AP No
Value
Description/Type
Qty
Component Ident
RESISTORS
5R1
51R
150R
300R
0. 125 W
0. 125 W
0. 125 W
0. 125 W
Metal Film
Metal Film
Metal Film
Metal Film
2
2
4
2
390R
0. 125 W Metal Film
8
620R
1K
1K 1
1K 2
0. 125 W
0. 125 W
0. 125 W
0. 125 W
Metal Film
Metal Film
Metal Film
Metal Film
2
4
4
2
2K 2
0. 125 W Metal Film
10
4K 7
5K 1
10K
20K
39K
0. 125 W
0. 125 W
0. 125 W
0. 125 W
0. 125 W
Metal Film
Metal Film
Metal Film
Metal Film
Metal Film
3
2
11
4
2
47K
0. 125 W Metal Film
9
75K
82K
160K
200K
300K
620K
820K
1M2
5M1
47R
430R
470R
10K
22K
47K
100K
CAPACITORS
10pF
15pF
18pF
100pF
0. 125 W Metal Film
0. 125 W Metal Film
0. 125 W Metal Film
0. 125 W Metal Film
0. 125 W Metal Film
0. 125 W Metal Film
0. 125 W Metal Film
0. 125 W Metal Film
0. 125 W Metal Film
0. 25 W Metal Film
0. 25 W Metal Film
0. 25 W Metal Film
0. 25 W Metal Film
0. 25 W Metal Film
0. 25 W Metal Film
0. 25 W Metal Film
2
2
2
2
2
2
2
4
2
3
2
2
1
2
3
1
1nF
1n5
47nF
100nF
680nF
10uF
10uF
10uF
47uF
470uF
1000uF
C er amic 50V 10% Pitch= 3mm
C er amic 50V 10% Pitch= 3mm
C er amic 50V 10% Pitch= 3mm
Ceramic 50V 10% Pitch=3mm
Polyester 63V 10%
Pitch=5mm
Polyester 63V 10%
Pitch=5mm
63V 10% Polyester Pitch= 5mm
Ceramic 50V 10% Pitch= 5mm
Polyester 100V 5% Pitch= 15mm
25V Electrolytic Radial (5mm) Pitch=
2.5mm
16V Electrolytic Radial (5.2mm) Pitch=
2.5mm
16V Electrolytic NP Radial (5.2mm)
Pitch= 2.5mm
25V Electrolytic NP Radial (8.4mm)
Pitch= 3.5mm
10V Electrolytic Radial (8.4mm) Pitch=
3.5mm
10V Electrolytic Radial (10.4mm)
Pitch= 5mm
2
1
1
2
2
2
6
6
2
Notes
R47, R73
R48, R74
R22, R90, R97, R98
R44, R70
R85, R86, R92, R96, R75, R78, R76,
R79
R46, R72
R37, R63, R88, R94
R2, R3, R7, R8
R45, R71
R4, R5, R9, R10, R15-R18, R43, R69,
R87, R89, R91, R93, R95, R105
R1, R6, R111
R35, R61
R38- R42, R64- R68
R30, R32, R56, R58
R36, R62
R11-R14, R77, R80, R99, R101, R102,
R103,
R34, R60
R28, R54
R33, R59
R24, R50
R31, R57
R29, R55
R26, R52
R25, R27, R51, R53
R23, R49
R81, R82, R104
R20, R21
R106, R108
R110
R83, R100
R84, R107, R109
R19
C 3, C 6
C 34
C 33
C36, C37
C38, C39
C1, C4
C 8, C 13, C 14, C 15, C 22, C 35
C19, C23, C26-C29
C2, C5
2
C7, C30
1
C20
4
C16, C17, C18,C24,
2
C31, C32
4
C9-C12
2
C21, C25
4
1
3
U1, U2, U9, U12
U 10
U 4, U 5, U 7
2
Q 1, Q 2
2
D 1, D 2
SEMICONDUCTORS
PY259
PY 1158
PY 214
NE5532
T SO P18 IR RX
U L N 2003A
TRANSISTORS
B C 337- 25
DIODES
1N 4148
Low Noise Dual Audio Op-Amp
IR Receiver Module
7 D ar lington D r iver s
Small Signal D iode
DIL08 Package
Replaces T SO P18
D IL 16 Package
T O 92
Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer.
Please obtain these locally.
24
AP16368/4
Cambridge Audio Azur 840A Amplifier Preamp PCB BOM
AP No
Value
B Z X 79- C 5V 1
MISCELLANEOUS
PY1156
Description/Type
Qty
Z ener diode 5V 1 400mW
RD902PF-20B6-30F-B5K-0C ALPHA B5K LINEAR POT
2
CK-6.35-04 7P
JST 2,5MM B2B-XH-A
JST 2,5MM B6B-XH-A
1
PY1141
D100-SSV-12
PY1140
D100-SSV-08
PY1157
D100-SSV-16
PY 645
ME - 2- 9 9V D C
Push switch - D PD T
HEADPHONE JACK SKT
2-way vertical header
6-way vertical header
Flat-film connector 12-way, reverseneedle type
Single row contacts
Flat-film connector 8-way, reverseneedle type
Single row contacts
Flat-film connector 16-way, reverseneedle type
Single row contacts
9V D C Relay
2402- 020200- 010
Component Ident
1
D3
VR1, VR2
2
1
CN1
CN10, CN12
CN3
2
CN2, CN5
4
CN6, CN8, CN9, CN11
1
CN4
19
1
RL 1- RL 19
SW 1
Notes
400mW D O 35 C ase.
Retractable 9mm pot. With centre
detent.
As used in 340A
Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer.
Please obtain these locally.
25
Cambridge Audio Azur 840A Amplifier
RED
1
36 V
2
0V
3
36 V
4
38 V
1
36 V
5.5A
MAINS ON/OFF RELAY
X1 10n
C30
ORANGE
RL3:B
4/5
3/6
ME14FW009HS
Secondary
INRUSH CONTROL RELAY
10A for 115V
6A3 for 230V
MAINS IN
J24
4/5
T6A3 AL
LVD!
BROWN
3/6
ME14FW009HS
R78
10R 10W WW
LIVE
YELLOW
5.5A
TO MAIN TRANSFORMER
RL4:B
F1
MAIN TRANSFORMER
X1 10n
C29
TO POWER AMP SUPPLY LEFT
(SEPARATE PCB)
J2
1
BROWN
230 V
BROWN/BLACK
GREEN
LIVE
100 mA
Primary
C23
J10
+48V R
5.5A
+48V IN
X2 470N SUPPRESSION
TERMINAL
RED
15000uF-63V
J1
2
BLUE/WHITE
+15V
ORANGE
0V
D25
2
D9
INRUSH CONTROL
C26
36 V
15000uF-63V
J12
-48V R
-48V IN
TERMINAL
PSU GND
1
1N4001
+5V PSU
F7
ORANGE
D23
T1A AL
LVD!
1N4002
1
ME14FW009HS
1N4001
ME14FW009HS
RL3:A
RL4:A
J13
GREEN
4
38 V
100 mA
PSU GND
TERMINAL
GREEN
D24
RED
J6
1
C28
4U7 50V
STANDBY TRANSFORMER
R79
4K7
J8
1
TERMINAL
J27
PSU GND
D19
D20
1N4002
1N4002
RELAY SUPPLY
C20
C34
100nF ceramic
X1 10n
D21
D22
1N4002
1N4002
J7
BROWN
U2
C31
+9V PSU
100nF ceramic
2R2 0.5W
TERMINAL
PSU GND
C33
230 V
NEUTRAL
4700u 16V
U3
17 V
100mA
NEUTRAL
TERMINAL
BLACK
1
C37
C35
TERMINAL
NEUTRAL
X1 10n
J5
J9
2
BLUE
0V
GREEN
113 DEG C
4
0V
TERMINAL
GREY
Secondary 2
C36
X1 10n
D15
D16
1N4002
1N4002
D18
1N4002
1N4002
100mA
5
17 V
J4
100u 25V
C15
470u 35V
2
F3
VI
C19
PSU GND
100u 25V
VO
-15V
3
C22
U4
100nF ceramic
7915
TERMINAL
GREEN
+15V
C18
1000U 35V EL
D17
OPAMP SUPPLY
100nF ceramic
3
VO
VI
C14
X1 10n
VIOLET
C32
7815
F2
20MM T1AL
GND
3
Primary
2
J3
YELLOW
J26
BROWN
+5V PSU
C16
47u 16V
R95
0V
3
VO
VI
TERMINAL
2
MICROCONTROLLER SUPPLY
7805
1
C24
1
PSU PCB
BROWN
-51V R
4700u 16V
Secondary 1
ORANGE
MAINS FAIL RECTIFIER
C17
220uF 100V
R88
AC
20MM T1AL
7.5 V
500mA
1N4002
C27
1000uF-50V
33R 1W
F4
AC
47K
3
5.5A
2
POWER AMP SUPPLY RIGHT
TERMINAL
BLACK
GND
R87
MAINS ON/OFF
0V IN
FROM RECTIFIER BOARD
YELLOW
1
2
3
-15V
4
5
0V
6
+9V
7
8
9
MAINS FAIL IN
10
MAINS ON/OFF
11
INRUSH
12
FFC 12WAY
J11
0V
Secondary
CN2
+15V
2
117 DEG C
NEUTRAL
+9V PSU
-15V
BLUE
GND
ALTERNATIVE POSITIONS FOR
X-CAPS WITH DIFFERENT LEAD PITCHES
C25
2
C13
X2 470N SUPPRESSION
RED
20MM T1AL
PSU PCB
MAINS IN
C11
CN3
+5V IN
X1 10n
N
E
R81
R96
GROUND
100K
L
CHASSIS GND
X1 10n
6
U1:B
+600 mV
LIVE
BROWN
To enhance viewing, please print to A3
LOW = NORMAL
7
MAINS FAIL IN
J25
10K
5
+310 mV
C12
R77
33K
IEC-SOC
MAINS FAIL
TO SHEET 1
LM393
MAINS SWITCH
ON REAR PANEL
R80
2K2
MAINS FAIL DETECT
AP16373/4 Power Amplifier (Right) Power Supplies & PSU PCB Schematic
26
Cambridge Audio Azur 840A Amplifier
+48V R
R40
R2
100R
C8
C7
47uF 16V
47uF 35V
R3
D10
68R
R19
R20
R62
0R1
0R1
150R
1N4148
Q3
D11
1N4148
R56
R91
R18
75K
100R
PHONES OUT RIGHT
D12
C4
1N4148
220uF 80V
220R 3W C
R46
R41
4K7
470R 1W C
Q4
Q13
Q14
2SA1295
2SA1295
D13
Q24
1N4148
MPSA93
R57
MPSA93
MJE340
R10
R12
1K8
18R
R5
100R
R27
R101
R33
C9
R52
D28
1K
12V
47uF 16V
RL1:B
3
100R
1K
R28
R22
12V
1K
VR1
2
D29
Q20
0R1
R29
R64
R60
R61
1K1
1K1
1
16K
Q29
R55
10R
MPSA93
3
VR2
10K
1N4148
Q28
0u1 POLYESTER
R44
47K
MJE340
MJE350
D34
2SA1295
D27
1N5404
Q15
1N4148
Q16
1N4148
100pF
Q9
-48V R
R31
R24
R25
100R
0R1
MPSA43
0R68
R92
56K
100pF
Q23
Q26
MPSA43
1N4148
C39
100K
2SC3264
2SC3264
D33
C10
CHASSIS GND
R98
R43
47K
D32
C38
1N4148
Q18
1K
Q2
R23
10U NP 16V
GND RIGHT
C2
100R
1
D31
GND RIGHT
MPSA93
R63
R100
J17
RIGHT OUT B
D8
Q17
470R
R32
1N4148
22K
J15
R30
2K7
D1
1K
J16
3
RELAY
SPEAKER TEST SENSE
3K6
1000U 10V EL
R99
RL2:B
4
R94
C6
100K
2
47K
5
2R2 3W
10R 3W
10K
R34
MPSA93
1N4148
R45
RELAY
L1
NFB-R
R53
C41
D30
-48V R
RIGHT OUT A
3
4
1,7U 10A
2K2
R97
J14
5
0R1
1K2
R14
4n7 COG
R26
R58
R59
470R
470R
C5
R42
220uF 80V
4K7
R84
0R1
MPSA43
10K
Q7
Q10
DC OFFSET NULL
-48V R
MPSA43
Q8
MPSA43
Q11
MPSA43
R15
BC337
+48V R
Q25
R49
MPSA43
R66
16K
47K
22K
R6
R7
R8
R89
R9
R51
68R
68R
2K2
10K
56R
10K
R37
R90
100K
47K
HI = NORMAL
-51V R
1N4148
R35
47K
DC OFFSET
D5
D4
Q21
MPSA43
XD ON/OFF
1N4148
+5V IN
+5V IN
CN1
R69
4K7
10K
+5V
LOGIC GND
SPEAKER TEST SENSE
+9V
OVERLOAD
CLIP
OVERTEMP
DC OFFSET
MAINS FAIL
XD ON/OFF
OUTPUT RELAY B
OUTPUT RELAY A
MAINS FAIL IN
spare
PHONES GND
PHONES R
R71
R74
1M
8
4K7
+850mV
U1:A
3
1
2
HI = NORMAL
4
LM393
OVERTEMP DETECT
R70
TH1
100deg C cutout
1K8
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
22U 50V NP
RL1:A
10K
CLIP
D14
OUTPUT RELAY A
1N4002
DC OFFSET
MAINS FAIL
1N4002
D7
OUTPUT RELAY B
1
RELAY
2
1N4148
R76
10K
D6
1N4148
1
R36
4K7
R39
RELAY
R82
R72
10K
4K7
4K7
OUTPUT RELAY B
OUTPUT RELAY A
MAINS FAIL IN
LOW = NORMAL
Q31
R86
BC337
10K
-48V R
LOW = NORMAL
Q36
BC337
10K
Q35
R50
Q33
R85
BC337
PHONES OUT RIGHT
RL2:A
2
R16
FFC 16WAY
ZPP22 100DEG
Q22
MPSA93
C3
LOGIC GND
SPEAKER TEST SENSE
47K
C40
D3
100nF ceramic
R38
10U 63V EL
+9V IN
C21
R68
CLIP
47K
RELAY
1K
R21
MPSA93
R13
+48V R
7
R47
LEFT OUT B
6
2K2
MPSA93
47U 16V
J20
8
3K3
R11
NFB-R
1
2
22K
RL2:C
+5V IN
R93
Q19
Q6
47K
MPSA43
JST 2.5MM B2B-XH-A
Q5
HI = NORMAL
2K7
MJE340
C1
1N5404
10R
16K
1N4148
Q12
CN4
RELAY
R48
22K
100R
7
D26
R65
R1
R54
D2
R67
AMP IN RIGHT
LEFT OUT A
6
J22
100R
22K
R4
MPSA93
J18
8
LEFT IN
Q1
R17
MPSA93
RL1:C
Q27
2K2
DC OFFSET DETECT
R73
R83
BC337
BC337
10K
47K
Q32
R75
10K
10K
Q34
BC337
PREAMP PCB - POWER AMP PCB CONN
POSITIVE THERMISTOR
850R at 100degC
LOGIC GND
OVERTEMP
OUTPUT RELAY CONTROL
BC337
E
B
RIGHT
MPSA43/93
C
C
B E
To enhance viewing, please print to A3
AP16373/4 Power Amplifier Right Channel
27
Cambridge Audio Azur 840A Amplifier
To enhance viewing, please print to A3
AP16373/3 Power Amp (Right) & PSU PCB Layout (Top Side)
28
Cambridge Audio Azur 840A Amplifier
To enhance viewing, please print to A3
AP16373/3 Power Amp Right & PSU PCB Layout (Bottom Side)
29
AP16376/7
Cambridge Audio Azur 840A Amplifier Power Amp Right PCB BOM
AP N o
V a lue
D e scr ipt ion/T ype
Q ty
C o m po n e n t I d e n t
RESISTORS
910R
2K2
4K7
10K
22K
33K
47K
100K
1M
10R
18R
56R
68R
100R
150R
470R
1K
1K1
1K2
1K8
2K2
2K7
3K3
3K6
4K7
0.125 W Metal Film
0.125 W Metal Film
0.125 W Metal Film
0.125 W Metal Film
0.125 W Metal Film
0.125 W Metal Film
0.125 W Metal Film
0.125 W Metal Film
0.125 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
1
1
5
6
1
1
2
1
1
2
1
1
3
9
1
3
6
2
1
1
4
2
1
1
3
10K
0.25 W Metal Film
8
16K
22K
0.25 W Metal Film
0.25 W Metal Film
3
5
47K
0.25 W Metal Film
8
56K
75K
100K
33R
470R
0R1
1R5
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
1 W Metal Film
1 W C ar bon
3 W Wire Wound
3 W W ir e W ound
1
1
4
1
1
6
1
R70
R80
R36 , R66, R68, R72, R74,
R16, R69, R75, R76, R77, R85,
R48
R81
R43, R90,
R96
R71
R1, R32
R12
R9
R3, R6, R7
R2, R4-R5, R14, R17, R18, R23, R24,
R62
R30, R58, R59
R52-R53, R63, R80, R99, R101
R60, R61
R11,
R10,
R8, R13, R27, R56,
R93, R94
R34
R33
R42, R46, R82
R39, R50, R51, R64, R73, R83, R84, ,
R89,
R49, R54, R55
R15, R57, R67, R81, R100
R35, R38, R44, R45, R47, R65, R66,
R86
R92
R91
R37, , R97, R98
R88
R41
R19-R22, R25, R26
R31
2R2
3 W Wire Wound
1
R28
10R
220R
CAPACITORS
3 W Wire Wound
3 W Carbon
1
1
R29
R40
1
C10, C39
3
C11, C12, C20
2
C18, C21
1
C2
2
C20, C38
1
C40
1
C3
100pF
10nF X1 CAP
100nF
100nF
10uF
10uF
22uF
Ceramic 100V 10% Pitch=
3mm
MEX103K300A02 Pitch
=10mm
Ceramic 100V 10% Pitch=
5mm
Polyester Pitch= 10mm
16V Electrolytic Radial Non
Polarised (6.4mm) Pitch=
5mm
63V Electrolytic Radial
(5mm diam) Pitch= 3.5mm
50V Non Polarised
Electrolytic Radial (5.2mm)
Pitch= 2.5mm
N ot e s
Space off PCB
Space off PCB
S pace off PCB
Space off PCB
Inductor damping res.
No need to stand off PCB
Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the
manufacturer. Please obtain these locally.
30
AP16376/7
Cambridge Audio Azur 840A Amplifier Power Amp Right PCB BOM
AP N o
V a lue
47uF
47uF
220uF
220uF
1000uF
1000uF
15000uF
D e scr ipt ion/T ype
Q ty
16V Electrolytic Radial
(5mm) Pitch= 2.5mm
35V Electrolytic Radial
(10mm) Pitch= 2.5mm
100V Electrolytic Radial
(12.5mm) Pitch= 5mm
80V Electrolytic Radial
(10.4mm) Pitch= 5mm
10V Electrolytic Radial
(10.4mm) Pitch= 5mm
50V Electrolytic Radial
(13.4mm) Pitch= 5mm
63V Electrolytic Radial
(35.4mm) Pitch= 10mm
C o m po n e n t I d e n t
3
C1, C8, C9
1
C7
1
C17
2
C4
1
C6
1
C27
2
C25, C26
N ot e s
SEMICONDUCTORS
PY1152
LM393AP
Low-offset dual
Comparator, A-version for
low offset voltage
1
U1
PY1148
PY1150
PY021
PY013
PY214
PY1149
PY 1147
TRANSISTORS
MJE 340
MJE 350
MPSA93
MPSA43
BC337-25
2SA1295
2SC 3264
DIODES
N PN D r iver T r ansistor
PN P D r iver T r ansistor
PNP Small Signal
NPN Small Si gnal
NPN Small Si gnal
PNP Power Audio
N PN Power Audio
3
1
10
8
9
3
2
Q 1, Q 12, Q 18
T O 126
Q2
T O 126
Q3-Q6, Q20, Q22, Q24, Q27-Q29
TO92WIDE
Q7-Q10, Q19, Q21, Q23, Q26, Q25, TO92WIDE
Q11, Q31-Q36
TO92
Q13, Q14, Q17
MT200
Q 15, Q 16
MT 200
1N4148
Small Signal Diode
18
1N4002
1N5404
B Z X 79- C 12
MISCELLANEOUS
Z P221A501E
General Purpose Rectifier
General Purpose Rectifier
12V Z ener diode 400mW
3
2
2
D1-D6, D8, D10-D13, D17, D18, D30 DIODE-IN4148
D34
D 7, D 14, D 23,
D O 41 Package
D 26, D 27
D O 27 Package Clamp diodes
D 28, D 29
400mW D O 35 C ase.
PO SIT IV E T H E RMIST O R
1
T H1
08-1950100-150
1.7uH 10A INDUCTOR
MULTITURN PRESET
1K
MULTITURN PRESET
10K
SS-7B-1
Top adjust. Footprint 9.5 x
4.5 mm
Top adjust. Footprint 9.5 x
4.5 mm
Wong Feng IEC-SOCKET
FFC CONNECTOR 16WAY, Vertical "Reverse
needle" type, Single row of
contacts
Fuseholder 20mm
FUSE-20MM 1A anti sur ge,
PY1151
D100-SSV-16
4031-050100-001
T1A AL
1
L1
1
VR1
1
VR2
1
D IL 08 Package
MPSA92 ma
MPSA42 ma
y be used
y be used
N ominal operating temp 100 deg C
10 turns of 1.5mm copper wire, diameter
20mm, length approx 20mm
Set quiescent current.
Insert so adj screw next to R17
DC trim
Insert so adj screw next to Q11
CN3
1
CN1
1 F7
1 F7
WMZ12A(
)-100S80FLS
Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the
manufacturer. Please obtain these locally.
31
AP16376/7
Cambridge Audio Azur 840A Amplifier PSU PCB BOM
AP N o
V a lue
RESISTORS
2R2
10R 10W
8.5X53MM
WireWound
4K 7
47K
CAPACITORS
10nF X1
Capacitor
100nF
470nF
4u7
47uF
100uF
470uF
1000uF
4700uF
D e scr ipt ion/T ype
Q ty
C o m po n e n t I d e n t
N ot e s
0. 5 W Metal Film
1
R95
Space off PC B
K N 10W J 10O hm B
1
R78
Inr ush r esistor . Space off PC B
0. 25 W Metal Film
0. 25 W Metal Film
1
1
R79
R87
MEX103K300A02 Pitch =10mm
6
C29, C30, C34-C37
Ceramic 100V Pitch= 5mm
X2 Suppression CAP
BOX 27.5X13 Pitch= 27.5mm or
BOX 22.5X10 Pitch= 22.5mm
50V Electrolytic Radial (5.2mm) Pitch=
2.5mm
16V Electrolytic Radial (5mm) Pitch=
2.5mm
25V Electrolytic Radial (6mm) Pitch=
2.5mm
35V Electrolytic Radial (10.4mm) Pitch=
5mm
35V Electrolytic Radial (10.4mm) Pitch=
5mm
16V Electrolytic Radial (16.4mm) Pitch=
5mm
4
C20, C22, C31, C32
1
C13 or C23 dependant on pitch
1
C28
1
C16
2
C18,C19
1
C15
1
C14
2
C 24, C 33
MAX IMU M H E IG H T 25 mm
5 V olt 1A L inear Regulator
15 V olt 1A L inear Regulator
- 15 V olt 1A L inear Regulator
1
1
1
U2
U3
U4
T O 220 Package
T O 220 Package
T O 220 Package
General Purpose Rectifier
G ener al Pur pose Rectifier
9
2
D15-D22, D24
D 9, D 25
DO41 Package
D O 41 Package
3
F2 - F4
1
F1
4
F1, 2, 3, 4,
1
F1
1
CN2
2
RL 3, RL 4
SEMICONDUCTORS
7805
7815
7915
DIODES
1N4002
1N 4001
MISCELLANEOUS
1A antisurge fuse 20mm (low breaking
capacity)
6.3A or 10A antisurge fuse 20mm (low
T6.3 AL or T10A
breaking capacity)
4031-050100Fuseholder 20mm
001
4034-000030Fuseholder cover
000
FFC CONNECTOR 12-WAY, Vertical
D100-SSV-12
"Reverse needle" type, Single row of
contacts
RELAY ME14F-9H16S SPST 16A 250 Vac
PY1154 RELAY ME14F
9V coil
T1AL
T6A3 for 230V
T10A for 115V
Place on mains fuse holder F1
Mains & inr ush contr ol r elays.
Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer.
Please obtain these locally.
32
Cambridge Audio Azur 840A Amplifier
+48V
R2
100R
C8
C7
47uF 16V
47uF 35V
R3
D10
68R
R19
R20
R62
0R1
0R1
150R
Q13
Q14
2SA1295
2SA1295
1N4148
Q3
D11
1N4148
R56
R72
R18
75K
100R
D12
C4
1N4148
220uF 80V
R46
4K7
Q4
D13
Q24
1N4148
MPSA93
MPSA93
2K2
Q27
Q1
R17
R57
MPSA93
R12
1K8
18R
NORMAL = HI
D7
D2
R54
R74
R1
16K
2K7
10R
MJE340
Q6
Q5
R52
R27
47uF 16V
R21
0R1
R45
L1
NFB-L
3
2
100R
1K
VR1
LEFT OUT
Q20
1K
D16
R22
12V
0R1
R29
R64
J6
2R2 3W
10R 3W
10K
R34
C15
TERMINAL
R28
2K2
MPSA93
R60
R61
1K1
1K1
TERMINAL
TERMINAL
C6
1000U 10V EL
R78
100K
R55
R76
16K
2K7
D1
1N4148
OUTPUT GROUND
J7
3K3
1
4n7 50V COG
J5
1,7U 10A
R53
R14
R13
47K
50mW
1K2
MPSA93
+48V
-48V
D14
12V
2K2
MPSA93
47U 16V
1K
C9
R11
NFB-L
1
2
R47
3K6
Q12
AMP IN LEFT
C1
47K
R33
MPSA43
JST 2.5MM B2B-XH-A
CN3
CLIP
22K
470R 1W C
47K
210mW
Q19
100R
R48
R41
1N5404
R65
1N4148
22K
R5
100R
220R 3W C
100R
R10
R67
R4
MPSA93
MJE340
22K
PHONES L
R40
R30
R32
Q29
10R
MPSA93
470R
Q28
D8
C2
Q17
0u1 POLYESTER
1N4148
MPSA93
1N4148
D17
3
R63
2
R81
1K
22K
10K
D24
D23
Q15
R73
1N4148
1N4148
D25
C10
1N4148
2SC3264
2SC3264
R79
100pF
C14
Q23
R31
Q26
MPSA43
R24
R25
R26
100R
0R1
0R1
R66
100pF
MPSA43
0R68
R58
R59
470R
470R
C5
R42
220uF 80V
4K7
10K
Q9
-48V
47K
50mW
D9
Q16
1N5404
56K
CHASSIS GND
100K
47K
50mW
2SA1295
R43
PAD
10U NP 16V
1N4148
R44
MJE340
MJE350
100R
P1
C20
1
D18
R80
1K
Q2
R23
VR2
Q18
MPSA43
Q7
DC OFFSET NULL
Q10
MPSA43
Q11
68R
MPSA43
R49
22K
68R
+48V
R82
Q25
R15
BC337
R7
47K
47K
MPSA43
R6
-48V
R50
MPSA43
Q8
R37
16K
100K
R8
R16
R9
R51
2K2
10K
56R
10K
LOGIC GND
-51V
1N4148
DC OFFSET
D5
D4
HI = NORMAL
Q21
MPSA43
+5V
1N4148
R35
+5V
47K
D3
D20
Q22
MPSA93
CLIP
Q31
R69
4K7
10K
R85
R75
1M
4K7
R91
1
U1:A
100R
4
LM393
C18
TH1
POSITIVE THERMISTOR
ZPP22 100DEG
100n ceramic
R70
D22
D21
1K8
1N4002
850R at 100degC
R86
1N4002
100K
R87
10R
100R
R88
SPEAKER TEST
LO = NO SHORT
LOGIC GND
+5V
+9V
SPEAKER TEST
CLIP
OVERLOAD
DC OFFSET
OVERTEMP
XD ON/OFF
MAINS FAIL
OUTPUT RELAY A
OUTPUT RELAY B
PHONES GND
MAINS FAIL IN
PHONES R
PHONES L
1N4148
D19
1N4148
FFC 16WAY
SPEAKER SHORT CIRCUIT TEST SYSTEM
100deg C cutout
D6
CN1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
PHONES L
OVERTEMP DETECT
1N4148
22U 50V NP
LOGIC GND
CN2
XD ON/OFF
2
HI = NORMAL
LM393
10K
MPSA93
100R
3
R90
7
6
R83
DC OFFSET
R89
10K
4K7
U1:B
5
8
R68
R71
C3
1N4148
PREAMP PCB - LEFT POWER AMP PCB CONN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
+5V
LOGIC GND
SPEAKER TEST SENSE
+9V
OVERLOAD
CLIP
OVERTEMP
DC OFFSET
MAINS FAIL
XD ON/OFF
OUTPUT RELAY B
OUTPUT RELAY A
MAINS FAIL IN
LOGIC GND
R36
4K7
DC OFFSET DETECT
-48V
PHONES GND
PHONES R
FFC 16WAY
LEFT POWER AMP TO
RIGHT POWER AMP CONNECTOR
LEFT
MJE340,350
BC337
MPSA43/93
Looking at pins
E C B
E
3
B
2
C
1
C
B E
To enhance viewing, please print to A3
AP16693/5 Power Amplifier Left Channel
33
Cambridge Audio Azur 840A Amplifier
FROM RECTIFIER BOARD
1
J1
36 V
+48V
+48V IN
5.5A
TERMINAL
+
RED
RED
C12
15000U 63V
POWER AMP SUPPLY LEFT
0V
-
J2
2
0V IN
+
ORANGE
TERMINAL
ORANGE
Secondary
MAIN TRANSFORMER
YELLOW
1
3
36 V
J4
GREEN
4
38 V
100 mA
RED
-
-48V
TERMINAL
YELLOW
BROWN
Primary
15000U 63V
J3
-48V IN
5.5A
230 V
C13
+48V IN
TERMINAL
F1
D15
T1A AL
LVD!
1N4002
C11
C17
1000uF 50V
220uF 100V
R38
-51V
33R 1W
GREEN
1
36 V
2
0V
3
36 V
4
38 V
5.5A
0V
2
ORANGE
BLUE
115 DEG C
Secondary
YELLOW
5.5A
TO POWER AMP SUPPLY RIGHT
GREEN
100 mA
To enhance viewing, please print to A3
AP16693/5 Power Amplifier Left Power Supplies
34
Cambridge Audio Azur 840A Amplifier
TH1 Q13
R19
Q15
C14
P1
R16
Q8 R8
R6
R51
Q5
R78
R41
R40
Q29
Q28
CN1
CN2
Q22
R75
R42
C18
D8
R43
R48
R45
R46
D17
VR2
D18
AP16694/4
AP16694/4
R70
R50 R71
Q23
C20
To enhance viewing, please print to A3
C17
R44
Q25
CN3
R80
D7
CLIP DETECT
Q24
Q3
R13
C1
C8
R69
R37
Q7
R79
R4
D6
R68
R36
U1
R49
R2 Q6
Q26
D5
R7
R14
OVERTEMP
Q11
D4
R47
SPKR TEST
C6
D3
R15
FIX3
DC OFFSET
Q21
C7
R5
Q27
Q20
Q10
Q4
C4
FIX2
Q2
C9
L1
C2
Q12
Q19
VR1
BIAS
C3
Q9
R56
R90
R27
R66
R35
R88
C13
R55
R86
R67
D13
R65
R9
R81
R85
D11
R91
R38
R53
R54
R87
C12
R34 C10
D12
D21
D10
R33
R52
R57
R64
D22
R3
R61
R63
R76
D16
R89
R28
R59
R73
D14
R11
FIX1
R60
D19
R29
R23
D1
R83
C11
R24
R58
R82
R10
R62
D20
D2
R1
R12
R32
R74
F1
R22
Q31
R17
D23
V+
VRED ORANGE
J1
J3
R30
R31
Q18
Q1
R21
D25
0V
Q17
R26
R25
R18
R72
BLACK
J2
Q16
R20
D24
J4
GREEN
38V AC
D15
BLK BLK
RED
OUTPUT GND GND
J5
J6
J7
Q14
D9
AP16693/5 Power Amp PCB Board Layout (Top Side)
35
Cambridge Audio Azur 840A Amplifier
To enhance viewing, please print to A3
AP16693/5 Power Amp PCB Board Layout (Bottom Side)
36
AP16696/9
Cambridge Audio Azur 840A Amplifier Power Amp Left PCB BOM
AP N o
V alue
D escr iption/T ype
Q ty
C omponent Ident
N otes
RESISTORS
10R
100R
910R
4K7
10K
22K
47K
100K
1M
10R
18R
56R
68R
0.125 W Metal Film
0.125 W Metal Film
0.125 W Metal Film
0.125 W Metal Film
0.125 W Metal Film
0.125 W Metal Film
0.125 W Metal Film
0.125 W Metal Film
0.125 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
1
3
1
6
3
1
4
2
1
2
1
1
3
100R
0.25 W Metal Film
10
150R
470R
1K
1K1
1K2
1K8
2K2
2K7
3K3
3K6
10K
16K
22K
47K
56K
75K
100K
33R
470R
0R1
1R5
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
0.25 W Metal Film
1W Metal Film
1 W C ar bon Pitch = 18mm
3 W Wire Wound
3 W W ir e W ound
1
3
4
2
1
1
4
2
1
1
4
3
4
5
1
1
2
1
1
6
1
2R2
3 W Wire Wound
1
10R
3 W W ir e W ound
1
R87
R86, R90, R91
R70
R36, R42, R46, R68, R75, R89
R69, R83, R85
R48,
R43, R44, R45, R50
R37, R88
R71
R1, R32,
R12
R9
R3, R6, R7
R2, R4, R5, R14, R17, R18, R23,
R24,
R62
R30, R58, R59
R52, R53, R63, R80,
R60, R61
R11,
R10
R8, R13, R27, R56
R74, R76
R34
R33
R16, R51, R64, R66,
R49, R54, R55
R15, R57, R67, R81
R35, R47, R65, R73, R82
R73
R72
R78, R79,
R38
Space off PC B
R41
Space off PC B
R19-R22, R25, R26
Space off PCB
R31
Space off PC B
Inductor damping res.
R28
No need to stand off PCB
R29
Z O B E L RE S. Space off PC B
220R
3 W C ar bon Pitch = 22. 5mm
1
R40
2
C10, C14
1
C18
1
C2
1
C20
1
C3
Space off PC B
CAPACITORS
100pF
100nF
100nF
10uF
22uF
Ceramic 100V 10% Pitch=
3mm
Ceramic 100V 10% Pitch=
5mm
Polyester 10% Pitch= 10mm
16V Non Polarised Electrolytic
Radial (5.2mm) Pitch=
2.5mm
50V Non Polarised Electrolytic
Radial (5.2mm) Pitch=
2.5mm
Note: resistors, capacitors and other 'generic' electronic components are not usually stocked
by the manufacturer. Please obtain these locally.
37
AP16696/9
Cambridge Audio Azur 840A Amplifier Power Amp Left PCB BOM
AP N o
V alue
47uF
47uF
220uF
220uF
1000uF
1000uF
15000uF
D escr iption/T ype
Q ty
35V Electrolytic Radial
(10mm) Pitch= 2.5mm
16V Electrolytic Radial (5mm)
Pitch= 2.5mm
80V Electrolytic Radial
(10.4mm) Pitch= 5mm
100V Electrolytic Radial
(12.5mm) Pitch= 5mm
10V Electrolytic Radial
(10.4mm) Pitch=5 mm
50V Electrolytic Radial
(13.4mm) Pitch= 5mm
63V Electrolytic Radial
(35.4mm) Pitch= 10mm
C omponent Ident
1
C7
3
C1, C8, C9
2
C4, C5
1
C17
1
C6
1
C11
2
C12, C13
1
U1
N otes
SEMICONDUCTORS
PY1152
LM393AP
Dual differential comparator,
A-version for low offset
voltage
D IL 08
TRANSISTORS
PY1148
PY 1150
MJE340
MJE 350
NPN Power Transistor
PN P Power T r ansistor
4
1
PY021
MPSA93
PNP High Voltage
11
PY013
MPSA43
NPN High Voltage
9
PY 214
PY1149
PY1147
B C 337- 25
2SA1295
2SC3264
DIODES
N PN Small Signal
PNP Power Audio
NPN Power Audio
1
3
2
1N4148
Small Signal Diode
18
1N 5404
1N4002
ZENER 12V
400mW
G ener al Pupose Rectifier
General Pupose Rectifier
2
3
Zener BZX79-C12
2
Q1, Q12, Q18, Q30
TO126
Q2
T O 126
Q3-Q6, Q20, Q22, Q24, Q27TO92WIDE
Q29, Q31
Q7-Q10, Q19, Q21, Q23, Q25,
TO92WIDE
Q26
Q 11
T O 92
Q13, Q14, Q17
MT200
Q15, Q16
MT200
D1-D6, D8, D10-D13, D17D20, D23-D25
D 7, D 9
D15, D21, D22
D14, D16
MPSA92 may be used
MPSA42 may be used
D O 27
DO41
400mW DO35 Case.
MISCELLANEOUS
Z P221A501E
MULTITURN
PRESET 1K
MULTITURN
PRESET 10K
PY1151
D100-SSV-16
T1A AL
PO SIT IV E T H E RMIST O R
Top adjust. Footprint 9.5 x 4.5
mm
Top adjust. Footprint 9.5 x 4.5
mm
FFC CONNECTOR 16-WAY,
Vertical "Reverse needle" type,
Single row of contacts
1 Amp 20mm antisurge fuse
4031-050100-001 Fuseholder 20mm
08-1950100-150 1.7uH 10A INDUCTOR
AP16831/3
To drawing Main heatsink
1
T H1
1
VR1
1
VR2
2
CN2
1
F1
1
F1
1
10 turns of 1.5mm copper wire, diameter
20mm, length approx 20mm
L1
1
N ominal oper ating temp 100 deg C
Set quiescent current.
Insert so adj screw next to R12
DC trim
Insert so adj screw next to R78
Q13, 14, 15, 16, 17
Note: resistors, capacitors and other 'generic' electronic components are not usually stocked
by the manufacturer. Please obtain these locally.
38
Cambridge Audio Azur 840A Amplifier
CN2
2
+12V
7812
3
+
GND
-
CN5
C8
VI
C910R 2W
GND
R28
10K
C7
100nF
R13
D3
F3
1
1N4004
POLYFUSE 1-1A
C32
220U 35V EL
100nF
3
RICCO PCB JACK
10uF 25V
C37
3
1
2
3
4
5
6
C19
220U 25V EL
220U 25V EL
+24V IN
ABUS GND
+24V
R6
C1
12K
XLR GND
ABUS GND
ABUS GND
XLR FEMALE
8
INPUT 1 RIGHT +
INPUT 1 RIGHT XLR GND
XLR GND
INPUT 1 LEFT +
INPUT 1 LEFT -
R55
10K
RIGHT
2
VO
OUT
78L12
CN8
1
2
IN
XLR FEMALE
1+G
+24V IN
+24V
U2
LOOKING AT LEADS
INPUT 1: BALANCED INPUTS
GND
+
C27
RIGHT
36K
CN7
1+G
JST 2,5MM B6B-XH-A
LEFT
2
R26
3
47U 25V
R1
47R
NE5532
R14
RIGHT
4
C20
ABUS GND
1
2
-
CONN TO INPUT PCB
100nF
U1:A
3
4K7
47U 25V
4K7
C4
10uF 25V
A-BUS A
C33
47pF
TOP OF CONN
ABUS GND
SIG GND
R5
R29
HUB - INPUT PCB CONN
CN1:B
ABUS GND
12K
C3
12K
9
10
11
12
13
14
15
16
CN3
10pF
1
2
3
4
5
6
7
8
9
10
HUB IN L
HUB IN R
SIG GND
SIG GND
+5V
LOGIC GND
SWITCHER DATA OUT
SWITCHER CLOCK OUT
SWITCHER STROBE OUT
R59
R60
47K
47K
C26
LEFT
36K
+5V
47U 25V
U1:B
R27
5
7
4K7
6
C21
FFC 10WAY
LOGIC GND
47U 25V
C6
R4
R3
4K7
12K
14
RA1/AN1
RA2/AN2/VRef
RA3/AN3/COMP1
RA5/MCLR/THV
RA4/T0CKI/CMP2
RB0/INT
RB1/RX/DT
RB2/TX/CK
MCLR HUB
RB3/CCP1
RB4/PGM
RB5
VSS
RB6/T1OSO/T1CKI
RB7/T1OSI
Q2
R11
+5V
5
K
100R
C28
R43
1
2
3
C35
ABUS GND
CN1:A
ABUS GND
8
7
6
5
4
3
2
1
12K
U3:B
47uF 25V
R41
4K7
5
7
6
STATUS LINE DRIVER
47U 25V
R16
C16
POLYFUSE 1-1A
47R
10K
10uF 25V
F2
LEFT
R33
C18
4K7
VERT2RJ45
A-BUS B
C36
NE5532
GND
L
GND
IR
STATUS
R
0V
+24V
BOTTOM OF CONN
47pF
R17
12K
10uF 16V
100nF
C13
CA IR DEMODULATOR
C31
10uF 16V
IR
LOGIC GND
+5V
3
2
1
GND
OPT
D7
1N4148
BZX79C2V7
D6
D8
1N4148
BZX79C2V7
K
TSOP1837 IR RECEIVER
37 kHz
D2
1
LOGIC GND
3
D5
IR receiver
U4
U7:A
ABUS GND
10pF
A
100nF
IR IN
10uF 25V
47pF
10pF
JACK-CKX-3.5-12
CN9
C29
CHASSIS GND
C15
R18
LOGIC GND
C17
RIGHT
R31
C24
3.5mm JACK
IR receiver
GND6
C14
12K
22K
R19
IR IN
220R
47R
ABUS GND
4K7
R8
R44
A
R15
1
2
R32
BC337
47R
ABUS GND
U3:A
3
4K7
100R
100K
R42
47R
GND
47U 25V
10K
R34
R40
100nF
R7
4K7
+24V DETECT
R57
10K
GND4
GND5
R9
+5V
PGM
TSOP1836 IR RECEIVER
OPT
C22
BC327
390K
R58
GND3
VERT2RJ45
NE5532
10K
Q1
D1
36 kHz
47U 25V
R10
+24V IN
CA IR DEMODULATOR
U6
C25
R56
PIC16F627-04/P
GND
GND2
12K
SIG GND
PROGRAM_DATA
PROGRAM_CLK
C12
R30
STATUS
6
7
8
9
10
11
12
13
LOGIC GND
+5V
100R
ABUS GND
HUB CLOCK OUT
HUB DATA OUT
17
18
1
2
3
+5V
U5
CN1:C
17
18
19
20
21
22
10pF
+24V
8
RA0/ANO
RA6/OSC2/CLKOUT
4
LOGIC GND
47pF
4
VDD
RA7/OSC1/CLKIN
16
15
VERT2RJ45
F1
ABUS GND
+12V
R12
C23
100nF
10uF 25V
LEFT
C2
100nF
10uF 16V
POLYFUSE 1-1A
47R
C34
+5V
C10
C5
R2
NE5532
GND
L
GND
IR
STATUS
R
0V
+24V
CN4
IR EMITTER OUTPUTS
2
+12V
4011
VDD=+5V
R22
1
100R
R24
Q3
U7:D
1
2
12
R46
R45
1
13
5
5
4
NC
100R
R51
R52
10K
10K
10
9
OP4N25
10K
CN15
GND
BLOCK
PIC TX
1
2
3
4
5
6
7
8
9
10
11
12
13
IR IN
PGM
MCLR HUB
PROGRAM_DATA
PROGRAM_CLK
R53
CN16
LOGIC GND
1
2
3
4
TX
RX
GND
CHAS
ABUS GND
R48
10K
Q4
BC337
Q5
Q6
BC337
BC337
R39
470R
10K
4K7
IR EMITTER OUTPUTS
R35
3
100R
R37
1N 50V NP0
R36
ABUS GND
4
ABUS GND
R38
27K
4
27K
100R
C11
6
U7:B
4011
VDD=+5V
VSS=LOGIC GND
100nF
ABUS GND
LOGIC GND
CONN-2.5PH-SIL4
FEMALE
R21
CHASSIS GND
5
100K
R20
C39
4011
VDD=+5V
RS232 CONN
TX
RX
GND
27K
100R
CN6
8
R47
2
27K
U7:C
2
3
R25
AV2-8,4-14/EC
3
4
R50
4011
VDD=+5V
6
220R
BC337
IR OUT
CN10:B
11
+5V
220K
LOGIC GND
U8
5
IR IN
CN10:A
AV2-8,4-14/EC
R23
R49
2R2
LOGIC GND
HUB DATA OUT
HUB CLOCK OUT
FFC 13WAY
C30
100nF CERAMIC
R54
10K
LOGIC GND
RS232 & IR CABLE FROM FRONT PANEL PCB
To enhance viewing, please print to A3
AP163771/3 Hub PCB Schematic
39
CHAS
GND
Cambridge Audio Azur 840A Amplifier
RX
TX
RS232
AP16378/3
AP16378/3
To enhance viewing, please print to A3
AP16377/3 Hub PCB Layout (Top Panel)
40
Cambridge Audio Azur 840A Amplifier
To enhance viewing, please print to A3
AP16377/3 Hub PCB Layout (Bottom Panel)
41
AP16380/5
Cambridge Audio Azur 840A Amplifier Hub Board BOM
AP N o
V a lue
0. 125 W Metal Film
4
4K 7
0. 125 W Metal Film
9
10K
0. 125 W Metal Film
10
12K
22K
27K
100K
390K
2R2
47R
0. 125 W Metal Film
0. 125 W Metal Film
0. 125 W Metal Film
0. 125 W Metal Film
0. 125 W Metal Film
0. 25 W Metal Film
0. 25 W Metal Film
8
1
4
2
1
1
2
100R
0. 25 W Metal Film
8
220R
470R
4K 7
10K
47K
10R
CAPACITORS
10pF
47pF
0. 25 W Metal Film
0. 25 W Metal Film
0. 25 W Metal Film
0. 25 W Metal Film
0. 25 W Metal Film
2 W W ir e W ound
2
1
1
3
2
1
C er amic 50V 10% Pitch = 3mm
C er amic 50V 10% Pitch = 3mm
4
4
100nF
C er amic 50V 10% Pitch = 5mm
10
10uF
47uF
220uF
220uF
SEMICONDUCTORS
N E 5532
PY 1007
PY 755
PY 219
PY 214
PY962
16V Electrolytic Radial (6.4mm)
Pitch =2.5mm
25V Electrolytic Radial (6.4mm)
Pitch =2.5mm
25V Electrolytic Radial (5.2mm)
Pitch =2.5mm
25V Electrolytic Radial (5.2mm)
Pitch =2.5mm
35V Electrolytic Radial (8.4mm)
Pitch =3.5mm
C o m po n e n t I d e n t
R1, R2, R15, R16
R4, R9, R14, R26, R27, R32, R33,
R40, R41
R10, R28, R42, R43, R47, R48, R51,
R52, R54, R55
R3, R5, R6, R17, R18, R29- R31
R11
R24, R25, R37, R38
R53, R56
R57
R49
R19, R34
R7, R8, R12, R22, R23, R35, R36,
R50
R44, R45
R20
R39
R21, R51, R58
R59, R60
R13
N ot e s
Space off PC B
C 2, C 3, C 13, C 14
C 33- C 36
C1, C6, C7, C11, C12, C17, C23,
C29, C30, C32
3
C10, C18, C31
5
C4, C5, C8, C15, C16
8
C20-C22, C24-C28
2
C19, C37
1
C9
7812
O P4N 25
L ow noise dual O p Amp
Texas Instruments Quad NAND gate
IC
12V , 1A r egulator , T O 220
O ptoisolator
PIC16F627 -04/P
PIC Microcontroller
1
U5
T SO P34837
T SO P34836
TRANSISTORS
B C 327- 25
B C 337- 25
DIODES
1N4004
37K hz IR Receiver Module
36K hz IR Receiver Module
1
1
U4
U6
T O 220
D IL 06
DIL18
Contact Audio Partnership Service
Department
T SO P18V ( Replaces T SO P1837)
T SO P18V ( Replaces T SO P1836)
PN P Small Signal
N PN Small Signal
1
5
Q1
Q 2- Q 6
T O 92
T O 92
General Purpose Rectifier diode
1
D3
MV50640
Red L E D
2
D 1, D 2
CD4011BE
PY 1144
Q ty
RESISTORS
47R
10uF
PY 259
D e scr ipt ion/T ype
1N4148
BZX79C2V7
MISCELLANEOUS
AJ-600-21-F-4-B
RDC-020-05
C K X - 3. 5- 10
JY-5033P*030
CKX-3.5-12
2
U 1, U 3
D IL 08
1
U7
Alter native is N ational semi C D 4011B C N
1
1
U2
U8
Small Signal Diode
Zener Diode 2.7 Volts
2
2
D5, D6
D7, D8
Allsun Dual vertical RJ45
DC power in connector
D ual 3. 5mm jack socket ( gr een)
Female XLR socket with gold pins
Single 3.5mm jack socket (black)
1
1
2
2
1
CN1
CN2
C N 4, C N 6
CN7, CN8
CN9
NO ALTERNATIVE LED TO BE USED
Fitted as part of assembly with AP17339/3
I R E MI T T E R O U T P U T S
Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the
manufacturer. Please obtain these locally.
42
AP16380/5
Cambridge Audio Azur 840A Amplifier Hub Board BOM
AP N o
V a lue
D e scr ipt ion/T ype
C O N N - 2. 5PH - SIL 4
C O N N - 2. 5PH - SIL 6
AP17339/3
Dual phono socket with EMC gnd
Orange inserts
Vertical FFC conn, reverse-needle
type
single-row contacts 10-way
Vertical FFC conn, reverse-needle
type
single-row contacts 13-way
JST ver tical header type X H
JST ver tical header type X H
IR Receiver Housing
PO L Y FU SE 1- 1A
RL D 30P110U
AV2-8,4-14/EC
PY1143
D100-SSV-10
PY1142
D100-SSV-13
Q ty
C o m po n e n t I d e n t
1
CN10
1
CN3
1
CN15
1
1
2
C N 16
CN5
Fit over D2/U4 and D1/U6
3
F1, F2, F3
N ot e s
For RS232 conn cablefor m
For balanced input
POLYFUSE 1.1A 30Vdc 7.4*14.2*3MM
6.6Sec
Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the
manufacturer. Please obtain these locally.
43
Cambridge Audio Azur 840A Amplifier
J1
1
36 V
5.5A
F1
TERMINAL
RED
J4
+48V OUT
T6A3 AL
LVD!
TERMINAL
C3
10nF
2
4
C1
C2
Secondary
YELLOW
1
BRIDGE BR-254
10nF
10nF
3
36 V
5.5A
230 V
2
0V
TERMINAL
MAIN TRANSFORMER
BR1
J3
J6
TERMINAL
GREEN
J5
3
ORANGE
J2 ORANGE
VIOLET
1
RED
-48V OUT
TERMINAL
BLUE
F2
TERMINAL
T6A3 AL
LVD!
YELLOW
BROWN
GREEN
4
38 V
1
36 V
2
0V
3
36 V
4
38 V
100 mA
Primary
RED
5.5A
0V
2
BLUE
ORANGE
115 DEG C
Secondary
YELLOW
5.5A
TO POWER AMP SUPPLY RIGHT
GREEN
100 mA
To enhance viewing, please print to A3
AP17575/2 Rectifier PCB Schematic
44
Cambridge Audio Azur 840A Amplifier
AUDIO PARTNERSHIP 2005
To enhance viewing, please print to A3
AP17575/2 Rectifier Board PCB Board Layout (Top Side)
45
Cambridge Audio Azur 840A Amplifier
To enhance viewing, please print to A3
AP17575/2 Rectifier Board PCB Board Layout (Bottom Side)
46
Cambridge Audio Azur 840A Amplifier, Rectifier PCB BOM
AP No
Value
Description/Type
CAPACITORS
10nF X1 Capacitor
DIODES
MEX103K300A02 Pitch =10mm
Bridge Rectifier BR254
400PIV 25A blk metal case
AP17578/2
Qty
Component Ident
3
Notes
C14-C16
1
BR1
Rectifier is not soldered to PCB until
PCB is fixed to amplifier heatsink
MISCELLANEOUS
T6A3 AL
4031- 050100- 001
6.3 Amp 20mm anti surge Fuse, low breaking
capacity
Fuseholder 20mm
2
F1, F2
2
F1, F2
Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer.
Please obtain these locally.
47
Cambridge Audio Azur 840A Amplifier IC Pin Layout
Details
TC9163AF – Input PCB (U1)
NE5532
Input PCB - (U2, U3, U4, U5, U6, U7, U8, U9,
U14 & U18)
A-BUS PCB – (U1 & U3)
Pre-Amp PCB – (U1, U2, U9 & U12)
ULN2003A
Input PCB - (U16)
Pre-Amp PCB – (U4, U5 & U7)
BC337
Input PCB - (Q1)
Pre-Amp PCB – (Q2, Q3, Q4 & Q5)
Front Panel PCB – (Q2, Q3, Q4 & Q5)
Right Hand Power Amp PCB – (Q11, Q31, Q32,
Q33, Q34, Q35 & Q36)
A-BUS PCB – (Q2, Q3, Q4, Q5 & Q6)
Left Hand Power Amp – (Q11)
TSOP18
Pre-Amp PCB - (U10)
PIC16F877A-I/SP
Front Panel PCB
48
74HC4094
Front Panel PCB - (U2, U3, U4, U5 & U6)
BC327
Front Panel PCB - (Q1 & Q8)
A-BUS PCB – (Q1)
LM393AP
Right Hand Power Amp PCB - (U1)
Left Hand Power Amp PCB – (U1)
MJE340
Right Hand Power Amp PCB - (Q1, Q12 &
Q18)
Left Hand Power Amp PCB – (Q1, Q12, Q18 &
Q30)
MJE350
Right Hand Power Amp PCB - (Q2)
Left Hand Power Amp PCB – (Q2)
MPSA93
Right Hand Power Amp PCB - (Q3, Q4, Q5 Q6,
Q20, Q22, Q24, Q27, Q28 & Q29)
Left Hand Power Amp PCB – (Q3, Q4, Q5, Q6,
Q20, Q22, Q24, Q27, Q28, Q29, Q31)
MPSA43
Right Hand Power Amp PCB - (Q7, Q8, Q9,
Q10, Q19, Q21, Q23, Q25 & Q26)
Left Hand Power Amp PCB – (Q7, Q8, Q9,
Q10, Q19, Q21, Q23, Q25, Q26)
49
2SA1295
Right Hand Power Amp PCB - (Q13, Q14 &
Q17)
Left Hand Power Amp PCB – (Q13, Q14 &
Q17)
2SC3264
Right Hand Power Amp PCB - (Q15 & Q16)
Left Hand Power Amp PCB – (Q15 & Q16)
CD4011BE
A-BUS PCB - (U7)
7812
A-BUS PCB - (U2)
OP4N25
A-BUS PCB - (U8)
PIC16F627-04/P
A-BUS PCB - (U5)
TSOP34837
A-BUS PCB - (U4)
TSOP34836
A-BUS PCB - (U6)
50
AP16396/2 Azur 840A Amplifier Technical Description
Start:
Updated:
11 Aug 05
29 Nov 05
Version 2
Revision history
V1->V2 More info added to operating instructions summary
This document gives a concise guide to the operation of the 840A XD amplifier.
CONTENTS
Azur 840A power supply PCB
AP16373/3_B
Azur 840A front panel PCB
AP16369/3
Azur840A input board PCB
AP16361/3
Azur 840A preamp PCB
AP16365/3
Azur 840A power amp Left PCB
AP16693/4
Azur 840A power amp Right PCB
AP16373/3_A
Azur 840A A-BUS Hub PCB
AP16377/3
Azur 840A Rectifier PCB
AP17575/2
Operating instructions summary
Service Menu
---==========================================---
NOTES
Logic signals are in upper case, thus; MAINS FAIL
References to “the PIC” or “the main PIC” are to the main housekeeping PIC on the front panel PCB
unless otherwise stated.
51
The Power Supply PCB
This carries:
Power supplies for everything except power amps
Mains on/off and inrush control switching relays
X2 capacitor
The mains-fail detect circuit
There are four power supply rails:
+15V
-15V
+9V
+5V
Opamp supply
Opamp supply
Relay supply
Microcontroller, logic and comparator supply
The power supply board also carries the mains switching relays that control the supplies to the power
amplifiers. When the amplifier goes from standby to ON, the inrush control relay RL4 closes first with
R78 limiting the inrush current. After 3 seconds (while speaker-short testing is going on- see below) the
On/Off relay RL3 closes. 100 msec later (to ensure no break in the supply) RL4 opens. When the
amplifier goes from ON to standby, RL3 simply opens.
The front panel PCB
This carries:
The main PIC
The volume rotary encoder and control switches.
The LCD display
Shift registers for driving the relays
The RS232 interface for control and software updates
U1 is the main housekeeping microcontroller for the amplifier; it is a 16F977A PIC running at 20 MHz. It
handles all the control functions of the amplifier except for those on the A-BUS hub PCB, which are
dealt with by another PIC on that board.
PIC pins handling amplifier conditions:
Speaker short-circuit detect
Phones detect
Mains fail
DC offset protection
Overtemperature protection
Overload protection
Clip detection
Pin
7
27
28
29
30
33
34
Normal
LOW
HIGH
LOW
HIGH
HIGH
HIGH
HIGH
Active
HIGH Active= short found
LOW Active= Phone jack in
HIGH
LOW
LOW
LOW
LOW
The LCD display module interfaces to the front panel PCB through CN2. Display data from the PIC is
clocked serially into shift register U2 and sent to the LCD module in byte-wide parallel format. The
LCD module is powered from the +5V rail.
52
The relays on the other PCBs are controlled by a set of shift registers that convert serial data from the
PIC into 32 latched outputs. Four shift registers (U3,U4,U5,U6) are connected so that the serial input
enters the first register and is clocked through and out of its serial output into the serial input of the
second register. Changing any output requires 32 bits to be clocked through the registers by the SERIAL
CLOCK signal. When SERIAL STROBE goes high the data is latched in each register to give a static
output. Data appears at the outputs only when the SHIFT REG ENABLE line is high. This line is kept
low at start-up to prevent random data at the outputs, and only goes high when the PIC has initialised
the shift registers.
The RS232 interface is used to control the amplifier and can also be used to reprogram the main PIC.
The interface consists of Q3 and Q4. Q3 handles incoming RS232 data, providing a level-shift from
RS232 levels (nominally +/-9V) to PIC levels (+5V/0V). Q4 handles outgoing RS232 data, level shifting it
to give a +15V/0V output.
The main PIC is reprogrammed by holding the standby/ON button in when the mains power is turned
on. The word DOWNLOAD appears on the LCD. A PC running a Windows program is used to
download the program.
The Hub PIC can in turn be reprogrammed by the main PIC. This is done by the PGM, MCLR HUB,
PROGRAM_DATA, and PROGRAM_CLOCK lines that go to the Hub PCB via CN3.
The Input PCB
The input PCB carries:
Input buffers
Input select relays
Tape out buffer
Input amplifier +6 dB
Hub input switcher
Relay drivers
The input PCB has one stereo input (Input 1) that accepts both balanced and unbalanced signals, and six
more unbalanced stereo inputs. There is a further input for tape monitor use. There is a tape output,
taken from before the tone and volume controls, and a preamp output taken from after the tone and
volume controls.
All component numbers here refer to the Left channel.
The A-BUS hub also uses the amplifier inputs. The required input is selected separately from the main
amplifier input by the CMOS switching IC U1. This is controlled by serial data from the microcontroller
on the hub PCB, in response to switch presses or IR commands.
The relays are driven from an 8-bit serial-in parallel-out (SIPO) shift register on the front panel PCB.
The eight logic signals come in on CN8 and control the 7-way open-collector relay driver U16. The
eighth relay is controlled by Q1.
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The Preamplifier PCB
The preamplifier PCB carries:
The tone controls and DIRECT switch
Relay balance control
Balance control buffer Amplifier
Relay volume control
Volume control post amplifier
Relay drivers
ON/standby LED control
The IR receiver
Headphone socket
All component numbers here refer to the Left channel.
The balance control operates in discrete steps selected by relays. There are eight steps on each side of
the central position. This is implemented by switching in combinations of three attenuator sections; the
first is R97,R22,R105, the second R85,R87 and the third R88,R86,R89. These are switched in or out by
relays RL17, RL18 and RL19. When none of these relays are energised the balance network gives the
first step of attenuation due to R97.
When RL15 is energised the balance attenuator network is inserted into the left channel and the stereo
image is shifted to the right. When RL16 is energised the balance attenuator network is inserted into the
right channel and the stereo image is shifted to the left.
The balance control attenuation steps are:
Step
0
1
2
3
4
5
6
7
8
Nominal
dB
0
-1.3
-2.5
-3.4
-4.5
-5.5
-6.8
-7.7
-8.8
The volume control is a relay-driven stepped attenuator that gives 1 dB steps from 0 dB to -64 dB.
There are 2 dB steps from -64 dB to -76 dB, and two final steps of -84 dB and -infinity. The final step
also opens the power amplifier output relays to ensure that “off” is well and truly off,
The volume control has an array of 14 resistances connected to an output rail. Each resistance is
connected to either the input signal rail or ground by its associated relay. (RL1 to RL14) The resistances
are typically made up two resistors to obtain the exact desired value. This represents a potential divider
that allows very fine control of attenuation. The 1 db steps are accurate to within +/-0.2 dB.
The volume network has a constant output impedance of 312 Ohms, independent of volume setting.
The volume setting is stored in non-volatile memory when the unit is switched off at the mains. The
volume control can be set to ramp up from zero to the stored setting at power-up, and to ramp down
on going to standby; this is an option on the configuration menu.
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The volume control and balance relays are driven from three 8-bit serial-in parallel-out (SIPO) shift
registers on the front panel PCB. The logic signals come in on CN6, CN8 and CN9, and control the 7way open-collector relay drivers U4,U5,U7. Driver U7 also controls the mains on/off and inrush relays,
(on the PSU PCB) the two amplifier output relays, (on the right amplifier PCB).
R111 is a pull-up resistor which allows MAINS ON/OFF RELAY to go high during testing if the PSU
board is not being used to power front-panel and preamp PCBs, and thus permits the LED control to
work properly in this condition.
Headphone socket
The phones Left and Right signals come in from the two amplifier PCBs. When a jack is inserted in to
the phones socket, the normally-closed contacts open, and the PHONES DETECT signal goes low,
signalling the PIC to open the output relays and disconnect the loudspeakers.
Power Amplifier PCBs
The power amplifier boards are very similar. The left channel is described in detail, and the right channel
description deals only with the differences.
Power Amplifier Left PCB
This description is subdivided as follows:
Input stage
DC trim system.
The Voltage Amplifier Stage
Biasing system
Output stage
The XD Crossover Displacement system
Power supplies
Overload protection
Clip detection
DC offset protection
Over-temperature protection
Speaker short-circuit detection
Headphone output attenuator
DC trim system.
VR2 and its associated components make up the DC trimming network; this allows to output DC offset
to be reduced to less than 1mV.
The XD Crossover Displacement system.
The essence of the Crossover Displacement principle is the injection of an extra current, varying with
the signal, into the output point of a conventional Class-B output stage, with the result that the
crossover point is displaced away from the no-signal voltage. The displacement current is made
proportional to the output voltage. For example, if the displacement current is 1 Amp with the output
at quiescent at 0V, it is set to increase to 2 Amps with the output fully negative, and to reduce to zero
with the output fully positive.
55
The XD control circuit is a differential pair of transistors with one input grounded and the other driven
by the main amplifier output voltage, scaled down appropriately by R63, R64. The drive to the displacer
is taken from collector load R58, to give the required phase inversion. R59 is present simply to equalise
the dissipation in the differential pair transistors to maintain their balance.
The tail of the differential pair is fed by constant-current source Q27. Since half of the standing current
through the differential pair flows through R58, the value of the tail current-source sets the quiescent
displacement current. Q27 is a simple current-source biased by silicon diodes D12, D13.
The displacement current itself is handled by the voltage-controlled current source Q18, Q17. The
Q18, Q17 structure acts as a unity-gain voltage stage with 100% voltage feedback from Q17 collector
to Q18 emitter, and it sets up the voltage across R58 as a voltage across the low-value resistor R31,
minus the Vbe drop of Q18.
There is provision for turning off the XD system under PIC control, to make servicing easier. This is
done by Q26. Normally the XD ON/OFF signal coming in on Pin 9 of CN2 is high, (+5V) so Q31 is
held off and Q26 is off. When XD is disabled, XD ON/OFF goes low and Q31 is turned on via R83. Q26
is then turned on via R82. The equivalent to Q26 on theright power amp PCB is also turned on by the
connection through Pin 10 of CN1.
Power supplies
The power supply for the power amplifier consists of three rails. The voltages given here are nominal as
they depend on the exact value of the mains supply voltage
The +48V rail supplies all the positive power to the amplifier.
The -48V rail powers only the amplifier output stage, including the XD Crossover Displacement system.
The -51V rail provides negative power for the small-signal circuitry. This permits greater output as
without it the negative-going voltage-swing of the voltage-amplifier stage is limited, and negative clipping
occurs before positive clipping.
Overload protection.
The amplifier is protected against short-term overloads by dual slope VI limiting. The upper half of the
output stage is protected by Q19 and associated components.
When overload occurs Q19 conducts and shunts current away from the base of Q1, limiting the
amplifier output. The current so shunted is limited in magnitude by the current-source Q4.
D2 prevents Q19 conducting backwards on negative output excursions.
The protection of the lower half of the output stage is very similar, Q20 being the VI limiter. However,
in this case the current shunted away when Q20 conducts is not inherently limited; this is done by the
extra current-limiting circuit Q11, R15, R16. When the voltage across R9 becomes excessive, Q11 turns
on and shunts the base drive away from Q9.
The amplifier is protected against long-term overloads by the PIC opening the output relay. Operation
of the VI limiter Q20 draws extra current through R9 and turns on Q25 via R49; this happens at a lower
current than that at which Q11 limits the VAS current.
Q25 collector is wire-ORed with the equivalent transistor on the right-hand amplifier PCB, and the
OVERLOAD SIGNAL goes to the preamp PCB via CN2, pin6.
56
Clip detection.
When it is enabled, the clip-detect system turns down the volume when excess clipping of either
amplifier output occurs. Very brief episodes of clipping are ignored. The volume stays reduced and does
not ramp back up in the absence of clipping.
The clip detect system is based on Q23, Q24 and associated components. Normally both transistors are
on, and the CLIP signal at Q24 collector is high.
Since the circuit operates by monitoring how far the output is from the supply rails, variations in supply
voltage are compensated for.
DC offset protection:
The output of the Left amplifier is filtered by R35 and C3 to remove audio content. If a DC voltage of
either polarity exists Q21,Q22 turn on and the voltage on Q21 collector falls. This point is wire-ORed
with the DC offset detector voltage on the right power amplifier PCB via CN1.
Detailed operation is as follows:
+ve DC offset:
D4, Q21, Q22, D6 conduct. Other diodes reverse-biased.
-ve DC offset:
D3, Q21, Q22, D5 conduct. Other diodes reverse-biased.
Overtemperature protection
Positive thermistor TH1 is mounted on the main amplifier heat-sink. At approx 100degC, its resistance
has risen to the point that the voltage on pin 6 of comparator U1:B exceeds the reference voltage of
+850 mV set up by R69,R70, and the comparator output goes low to 0V. R71 provides a small amount
of hysteresis to give clean switching. The comparator has an open-collector output and R75 is the
external pull-up resistor. The output signal is passed to the main PIC.
Speaker short-circuit detection
When the amplifier goes from standby to ON, the speaker outputs are checked for short-circuits before
the output relays are closed. This system is centred on comparator U1:A but also involves circuitry on
the Right Amplifier PCB.
Short-circuits are checked for by passing a small current through the loudspeaker impedances and
monitoring the resulting voltage. A DC current of 5mA is injected through R101 on the Right Amplifier
PCB, via the normally-closed contacts of RL1 and RL2. This places all connected loudspeakers, left and
right, A and B, in parallel so the resulting voltage is not large. It is sent to the left amplifier PCB, where
comparator U1:A compares it with a reference voltage of 5mV set up by potential divider R85,R87. If
the combined loudspeaker resistance is below 1 Ohm, the output of U1:A goes high, signalling a short
condition to the main PIC.
Headphone output attenuator
The headphone output attenuator comprises R40 and R41. The headphone socket is on the preamp
PCB.
Power Amplifier Right PCB
This description is subdivided as follows:
The right power amplifier
The output relays
Output relay control system
Mains-fail detect system
57
The right power amplifier and its various protection systems operate identically to those on the left
amplifier PCB, except for the following differences:
Mains-fail detect system
The mains-fail detect system is based on comparator U1:B. It takes the MAINS FAIL IN signal from the
PSU board (see above) and compares it with a reference voltage of +310 mV set up by potential divider
R81,R80. When MAINS FAIL IN drops below this threshold, the output goes high. This signal, MAINS
FAIL, is sent to the PIC via CN1, pin 9.
A-BUS Hub Board
This board carries the following functions:
The XLR sockets for the balanced input mode of Input 1
Two A-bus outputs
Hub IR input
Hub microcontroller
Hub Power supply
IR in/out interface
The XLR sockets simply pass the Input 1 signals down to the input board via screened cables.
The A-bus outputs take an input selected by the hub input switcher, amplify it by 2.5 times, and send it
to the remote keypads. R59,R60 are DC drain resistors that minimise clicks shortly after power-up.
The output amplifiers U1,U2 work from a single +24V rail, and so are biased to sit at +12V. The bias
supply is derived from the +12V supply rail.
The hub amplifiers have their own ground (ABUS GND) to prevent ground loops, and this use of the
differential amplifier performs a change of reference so a clean signal reaches the hub amplifier seven if
the two grounds have noise voltage between them.
The hub microcontroller U5 is a PIC16F72. This performs the following tasks:
Control Hub input switcher from IR commands
Send input select data to main PIC
Control Hub input switcher to prevent thumps on 840A output
Control A-bus status line
IR commands to the A-bus keypads are sent to the hub so that the required input can be selected and
external equipment controlled. Thus, for example, a tuner station can be changed from the keypad; the
IR comes to the hub, is sent out again via the IR emitter outputs, and activates emitters pointing at the
tuner unit.
Modulated IR signals coming in from the keypads are diode-ORed together by D5, D6. The Zener
diodes D7, D8 reject low-level noise on the incoming IR lines. The combined IR signals are buffered by
emitter-follower Q3, and sent out via CN4, CN6 to drive external IR emitters. Incoming modulated IR
signals for input select are also sent to the Hub PIC U5; LED D2 is driven from Q3, and points at IR
receiver U4, the pair being housed in a small light-tight enclosure. The demodulated IR is then applied
to Pin 7 of Hub PIC U5, which sends appropriate commands to the hub input selector IC on the input
PCB, over the strobe, clock and data lines.
58
Information on which Hub input is selected (or if no input is selected) is sent from the Hub PIC to the
main PIC by the two lines HUB CLOCK OUT and HUB DATA OUT. This is then displayed on the
LCD. The active 840A input is denoted by a round marker; the active Hub input is denoted by a circle
around it.
The Hub PIC controls the A-bus status line so that it is high when the 840A is powered and low when it
is not. It also implements the “all off” feature; when this command is received from one keypad the Hub
PIC ensures that both are turned off.
The Hub PIC can be reprogrammed by the main PIC. This is done by the PGM, MCLR HUB,
PROGRAM_DATA, and PROGRAM_CLOCK lines that come from the front panel PCB via CN15.
IR in/out interface
The other IR system on the Hub PCB is wholly concerned with control of the 840A amplifier itself, and
has no connection with the Hub IR system.
Modulated IR data (as an electrical signal) enters via 3.5mm jack CN9, and drives LED D1, which
illuminates IR receiver U6, the pair being housed in a small light-tight enclosure. This demodulates the IR
and passes it on to U7:A, which ORs it with the data from the unmodulated IR input, and sends the IR
IN signal to the main PIC via CN15. When it reaches the front panel PCB (see above) it is further ORed with the IR data from the receiver on the front of the 840A unit.
The unmodulated IR signals enter via phono connector CN10:A, and drive optocoupler U8; this isolates
the grounds and prevents ground loops. The optocoupler output drives Q4 through R47. Q4 collector,
if Q6 is off, provides the IR signal to U7:A as mentioned above, and also drives Q5 via R53, to re-invert
the signal and preserve its phase. It is then OR-ed with the PIC TX signal by U7:B, and buffered by
U7:C and U7:D to provide enough drive for the IR output. R50 protects the output and C11,R49 isolate
the IR output ground.
IR commands can also be generated by the 840A itself. These come from the main PIC as the signal PIC
TX on CN15, and are combined into the IR output as described above. When such commands are being
sent, it is important to disable any external IR commands from being sent through as they will combine
to give garbled data. This is done by the BLOCK signal from the main PIC, coming in via CN15. When
this is high it turns on Q6 and prevents external IR commands from reaching Q5.
The Rectifier PCB
This board mounts on the main heat-sink of each amplifier module. It consists of the rectifier itself,
three suppression capacitors to reduce RF noise created by rectifier commutation, and two fuses in the
incoming AC lines from the transformer.
---================
==================
============---
Operating Instructions Summary
This is a very brief guide to enable all the controls and menus of the 840A to be accessed if the full
manual is not available. (seewww.cambridge-audio.comfor a downloadable user manual).
To adjust the balance:
Briefly press the Mode button. The balance display appears and can be changed using the volume knob.
To return to volume mode, give the Mode button another quick press. The 840A will automatically
return to volume mode after 5 seconds.
59
To rename inputs:
Press and hold the relevant input select button. Letters in the name are selected by turning the volume
knob.
To access the configuration menu:
Press and hold the Mode button. These are the menu options:
Clip detector on/off
LCD brightness (off/dim/bright)
Input gain trim menu access
Volume ramp on/off
Volume display: -84 to 0 dB or 0 to 72 units
Fixed input gain menu access
To adjust the gain of an input:
Press the button next to INP TRIM
Select the input required
Use volume knob to set gain between 0 and -12 dB
(the available range is restricted if the volume is set very low)
Press Mode button to return to volume display
To set up fixed input gain
Press the button next to FIXED INP
Select the input required
Set the fixed gain using the volume control.
(the OFF setting does not disable the input- it leaves the input gain
subject to the volume control)
Press Mode button to return to volume display
To access the service menu:
Hold in the Mode button when mains power is switched on. These are the menu options:
Speaker short detection on/off
DC offset detect on/off
XD system on/off
Counter access
Press Mode button to return to volume display
The counter page keeps a total of the number of times these events have occurred:
Clipping detected
CL
DC offset detected
DC
Overload protection
OV
Overtemperature shutdown
TM
Speaker short detected
SH
Time on in hours
ON
Press Mode button to return to service menu
To reprogram the PICs:
Hold in the ON/standby button when mains power is switched on. The word DOWNLOAD appears on
the LCD.
60
840A Software Loading Instructions
1) Push and hold the “Standby / On” on the front of the840A whilst turning on the power switch at
the rear. After about 4 seconds the following should be displayed on the LCD:
2) Connect a Null Modem RS232 cable from the 840A to the PC’s comm port.
3) Run the Loader program from the Azur 840A program group in the start menu. The following
window will be displayed:
4) Choose the comm port the RS232 cable is attached to and click OK. The following window will
be displayed:
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5) Click the Load File button, the following window will be displayed:
Locate the file “840A.hex” and click open. The following window should be displayed:
6) Click the Download Code button, “Loading…” will be displayed on the LCD. The ABUS
processor will be programmed followed bythe Main processor. Once the programming has
finished, “Programming Completed!” will be displayed and the 840A will reset.
62
840A
________________________________________________________________________________
Notes.
Gallery Court Hankey Place London SE1 4BB UK
Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233
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