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Gallery Court Hankey Place London SE1 4BB UK Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233
840AIssue 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.
© 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
840A Block DiagramTo enhance viewing, please print to A3 5
7
106
2
3
9
17
4 18
15
8
13
5
11
16
6
115
14
12
5
Cambridge Audio Azur 840A Amplifier
840A Exploded DiagramTo enhance viewing, please print to A3 6
Cam
bri
dge A
ud
io A
zu
r 840A
Am
plifier
Exp
lod
ed
Dia
gra
m P
art
s Lis
t
Dra
win
g
Ref:
AP
Part
Nu
mb
er
noit
pircse
D:f
eR
yrotc
aF
1P
Y1
11
82
33
1-0
04
90
9E
30
1Sp
eak
er
Bin
din
g P
ost
BP
33
1 (
Bla
ck)
Red
& B
lack
2P
Y1
01
93
20
0-0
53
04
4E
000
To
roid
23
0V
/50
Hz
36
.5V
AC
x4
5.5
A T
I-0
53
04
4C
2P
Y1
02
03
20
0-0
53
04
5E
000
To
roid
11
5V
/50
Hz
36
.5V
AC
5.5
A T
I-0
85
30
45
C f
or
84
0A
3P
Y1
11
93
20
0-0
74
05
1E
00
1T
oro
id 2
30
V/5
0H
z 7
.5V
AC
75
0M
A 1
7V
AC
*2 T
O7
40
5B
ST
B
3P
Y1
12
03
20
0-0
77
81
1E
000
To
roid
11
5V
/50
Hz
7.5
VA
C7
50
MA
17
VA
C*2
ST
B
4P
Y1
12
16
07
4-1
50
00
3E
00
0-0
18
40
A B
ass
/ T
reb
le K
no
b (
Bla
ck)
Pai
nte
d B
lack
4P
Y1
12
36
07
4-1
50
00
3E
00
1A
01
84
0A
Bas
s /
Tre
ble
Kno
b (
Silv
er)
Pai
nte
d S
ilver
5P
Y1
12
26
07
4-1
50
00
4E
000
Azu
r 8
40
A P
last
ic F
oo
t (B
lack
) A
P1
68
37*
5P
Y1
12
46
07
4-1
50
00
4E
00
0A
01
Azu
r 8
40
A P
lasi
tc F
oo
t (S
ilver)
AP
16
83
7*
PY
11
25
65
74
-15
00
09
E0
00
-01
Azu
r 8
40
A T
op
Pan
el B
lack
Pai
nte
d
PY
11
26
65
74
-15
00
09
E0
00
-02
Azu
r 8
40
A T
op
Pan
el S
ilver
6P
Y1
127
65
74
-15
00
13
E0
00
-01
Azu
r 8
40
A S
ide P
anel,
Bla
ck P
ainte
d
6P
Y1
12
86
57
4-1
50
01
3E
00
0A
01
Azu
r 8
40
A S
ide P
anel,S
ilver
7P
Y1
12
98
58
4-0
15
01
0E
30
1A
zur
84
0A
Bla
ck F
ront
Pan
el A
ssy
7P
Y1
13
0A
zur-
84
0A
Silv
er
Fro
nt
Pan
el A
ssy
8P
Y1
13
16
57
4-1
50
01
2E
00
0-0
1A
zur
84
0-A
B F
ront
Pan
el A
rtw
ork
AP
18
63
71
/18
63
81
(M
eta
lwo
rk O
nly
)
8P
Y1
13
2A
zur
84
0-A
Silv
er
Fro
nt
Pan
el A
rtw
ork
AP
18
63
71
/18
63
81
(M
eta
lwo
rk O
nly
)
PY
11
33
60
74
-15
00
05
E0
00
Azu
r 8
40
A V
olu
me K
no
b P
last
ic Inse
rt (
AP
17
43
*)
65
74
-15
00
15
E0
00
Azu
r 8
40
A V
olu
me K
no
b S
kin
, B
lack
Azu
r 8
40
A V
olu
me K
no
b S
kin
, Si
lver
PY
11
35
31
10
-84
00
00
E0
00
LC
D D
isp
lay
Hig
hly
Tra
nsf
lect
ive D
C0
00
03
E0
2 8
40A
PY
11
36
66
00
-99
01
12
E0
00
Azu
r 8
40
A D
isp
lay
Bac
klig
ht
(AP
16
84
1*)
PY
11
38
24
09
-01
02
00
E0
01
Ro
tary
Enco
der
Swit
ch R
EB
G1
61
(9*7
)PV
B2
0FH
INB
1-2
-24E
9P
Y1
13
99
48
4-0
15
00
0E
04
1A
zur-
84
0A
AM
P-H
ub
Co
ntr
ol P
CB
Ass
y R
ev
A
10
PY
11
59
94
84
-01
50
00
E3
41
Azu
r-8
40
A A
mp
Inp
ut
PC
B A
ssy
Rev
A
11
PY
11
53
94
84
-01
50
00
E1
41
Azu
r-8
40
A E
U/U
K P
SU P
ow
er
Co
ntr
ol P
CB
Ass
y R
ev
A
12
PY
11
46
94
84
-01
50
00
E0
91
Azu
r-8
40
A M
ain-A
mp
Left
PC
B A
ssy
Rev
A
13
PY
11
63
94
84
-01
50
01
E0
91
Azu
r-8
40
A M
ain-A
mp
Rig
ht
PC
B A
ssy
Rev
A
14
PY
11
55
94
84
-01
50
00
E3
31
Azu
r-8
40
A P
re-A
mp
Bo
ard
Rev
A
15
PY
11
45
94
84
-01
50
00
E0
71
Azu
r-8
40
A A
mp
-Rect
ifie
r P
CB
Rev
A
16
PY
11
37
94
84
-01
50
00
E1
11
Azu
r-8
40
A A
mp
Fro
nt
Co
ntr
ol P
CB
Ass
y R
ev
A
17
PY
11
34
94
84
-01
50
00
E0
61
Azu
r-8
40
A L
CD
Dis
pla
y B
oar
d A
ssy
Rev
A
18
PY
11
65
98
05
-08
40
00
E0
01
Azu
r-8
40
A R
em
ote
Co
ntr
ol A
ssy
Rev
A
All s
pare
part
s sh
ou
ld b
e o
rdere
d f
rom
AP
Ho
ng K
on
g o
ffic
e
7
Cambridge Audio Azur 840A Amplifier
AP16369/3 Front Panel PCB Schematic (Microcontroller & LCD)
MCLR/VPP1
RA0/AN02
RA1/AN13
RA2/AN24
RA3/AN3/VREF5
RA4/T0CKI6
RA5/AN4/SS7
RE0/RD/AN58
RE1/WR/AN69
RB437
RB3/PGM36
RB235
RB0/INT33
VDD32
VSS31
RD7/PSP730
RD6/PSP629
RB134
RD5/PSP528
RD4/PSP427
RC7/RX/DT26
RC5/SDO24
RC4/SDI/SDA23
RD3/PSP322
RD2/PSP221
RC6/TX/CK25
VDD11
VSS12
OSC1/CLKIN13
OSC2/CLKOUT14
RCO/T1OSO/T1CKI15
RC1/T1OSI/CCP216
RC2/CCP117
RC3/SCK/SCL18
RD0/PSP019
RE2/CS/AN710
RD1/PSP120
RB538
RB6/PGC39
RB7/PGD40
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
C10100n 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
R122R
R243R
Q2
BC337
LOGIC GND
R44K7
C1100n
C2100nF
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
22pFLOGIC 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 GND3
A SW1
B SW2
FIX25
FIX14
ROT1
NOBLE16ENCODER
POSITION FOR
EXTRA SWITCH
AK
D2BLUE LED
ON/STBY LED
IR IN (FROM JACK & PHONO ON HUB PCB)
+15V
IR GND
IR IN
RS232 GND
R1010R
C9
100N CERAMIC
SERIAL RX 232
C410U 16V
C310U 16V
R5100R
C20100nF
LOGIC GND
C21
100n
LOGIC GND
LOGIC GND
Q4
BC337
+15V
RS232 TX
R13
22K
R122K2
LOGIC GND
SERIAL TX 232
Q3BC337
+5V
D31N4002
RS232 RX
R1110K
R9
22K
LOGIC GND
SERIAL RX 232
RS232 RX
RS232 TX
SERIAL TX 232
PROGRAM_CLOCK
PROGRAM_DATA
PGM
MCLR HUB
R1410K
+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
D2
CLK3
STB1
OE15
Q04
Q15
Q26
Q37
Q414
Q513
Q612
Q711
QS9
QS10
U2
74HC4094
VDD=+5V
VSS=LOGIC GND
SHIFT REG ENABLE
SERIAL DATA
SERIAL CLOCK
BLOCK
PIC TXIR CONTROL
PHONES DETECT
OVERLOAD
DC OFFSET
MAINS FAIL
LCD DECOUPLE
C7100nF
LOGIC GND
+5V
SHIFT REG DECOUPLE
1
2
3
4
5
6
7
8
9
10
11
12
CN1
FFC 12WAY
1 2
15 16
1
2
3
4
5
6
1a
2a
3a
4a
5a
6a
7
8
7a
8a
CN2
CONN-8 DUAL BOT
RS
ELCD 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
R61K1
R72K2
R8
1K1
SPEAKER TEST
SPEAKER TEST
C22
100n
+5V
TRISTATE LED CONTROL
0 = BRIGHT
TRISTATE= OFF
1= DIM
R1510K
LOGIC GND
R1647R
C23
100N CERAMIC
LOGIC GND
FRONT PANEL GROUNDING
Q5
BC337
R1710K
R182K2
C24
10U 16V
Q6
BC337
R19
10K
LOGIC GND
FRONT PANEL GND
FRONT PANEL GND
P2
PAD
P3
PAD
Q1
BC327-25
2
CW
3C
CW
1
PR1PRESET 20K 3296W
CW
Q8
BC327-25
R23 10R
R24 10R
D41N4148
D5
1N4148
D6
1N4148
D71N4148
D8
BZX79C2V7 500MW
To enhance viewing, please print to A3 8
Cambridge Audio Azur 840A Amplifier
AP16369/3 Front Panel PCB Schematic (Shift Registers)
D2
CLK3
STB1
OE15
Q04
Q15
Q26
Q37
Q414
Q513
Q612
Q711
QS9
QS10
U3
74HC4094
VDD=+5V
VSS=LOGIC GND
LOGIC GND
D2
CLK3
STB1
OE15
Q04
Q15
Q26
Q37
Q414
Q513
Q612
Q711
QS9
QS10
U4
74HC4094
VDD=+5V
VSS=LOGIC GND
D2
CLK3
STB1
OE15
Q04
Q15
Q26
Q37
Q414
Q513
Q612
Q711
QS9
QS10
U5
74HC4094
VDD=+5V
VSS=LOGIC GND
FROM SHEET 1SERIAL 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
D2
CLK3
STB1
OE15
Q04
Q15
Q26
Q37
Q414
Q513
Q612
Q711
QS9
QS10
U6
74HC4094
VDD=+5V
VSS=LOGIC GND
1
2
3
4
5
6
7
8
CN7
FFC 08WAY
C8100nF
+5V
C12100nF
C13100nF
C14100nF
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 Q
2
Q3 Q4 R5
C20
AP16370/3
C21
C22
R7
U2
U3U4
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
RESISTORS10R 0.25 W 1% Metal Film 3 R10, R23, R2422R 0.25 W 1% Metal Film 1 R143R 0.25 W 1% Metal Film 1 R247R 0.25 W 1% Metal Film 1 R16100R 0.25 W 1% Metal Film 1 R51K1 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 R410K 0.25 W 1% Metal Film 5 R11, R14, R15, R17, R1922K 0.25 W 1% Metal Film 2 R9, R13CAPACITORS22pF Ceramic 50V 10% Pitch=5mm 2 C5, C6100pF Ceramic 50V 10% Pitch=5mm 2 C15, C16
100nF Ceramic 50V 10% Pitch=5mm 17C1, C2, C7, C8, C9, C10, C11, C12-C14, C17 - C21, C22, C23
10uF16V 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 U1Contact Audio Partnership ServiceDepartment
PY1100 74HC4094 Shift register 16 pin DIL 5 U2 - U6TRANSISTORS
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 flat top 1 D2
1N4148 General purpose diode 4 D4,D5, D6,D7
.esaC53ODWm0048D1Wm0047V2edoidreneZ7V2-C97XZB
1N4002 General Purpose Rectifier 1 D3
MISCELLANEOUS
PY1141 D100-SSV-1212-WAY FFC reverse-needle type, single-row contacts
1 CN1
PY1142 D100-SSV-1313-WAY FFC reverse-needle type, single-row contacts
1 CN3
PY1140 D100-SSV-088-WAY FFC FRONT-PREAMP CONNS, reverse-needle type single-row contacts
4 CN4, CN5, CN6, CN7
PY1138REB161(9x7)PVB20FHINB 1-2-24E
Noble ROTARY ENCODER 1 ROT1
11WS-1WS11hctiwstcaT000-002020-0042340YP
1X1H4/94CHLATSYRCzHM02MULTITURN PRESET 20K
Side adjust. Foot print 9.5 x 4.5 mm 1 PR1
Cambridge Audio Azur 840A Amplifier 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
R1220K
R2220K
R3
47R
R4
1K
R5
1K
R6220K
R7220K
R8
1K
R9
100R
R10
1K
R12220K
R13220K
R14
47R
R15
1K
R16
1K
R17
1K
R18
1K
R19
100R
R20220K
R21220K
C1
100n CER
C2
100n CER
R23
100R
C3
100nF 100V
R24220K
R25220K
LEFT RIGHT
TAPE RETURN RTAPE 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
Vss1
L-S12
L-S23
L-S34
L-COM15
L-S46
L-S57
L-S68
L-COM29
L-S710
L-S811
L-COM312
ST13
GND14
Vdd28
R-S127
R-S226
R-S325
R-COM124
R-S423
R-S522
R-S621
R-COM220
R-S719
R-S818
R-COM317
DATA16
CLK15
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
R28220K
R29220K
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
R30220K
R31
1K
3
CN4:B
QUAD PHONO
R32220K
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
84 U14:A
NE5532
5
6
7
U14:BNE5532R57 20K
R5820K
R5910K
R6010K
R6120K
R6220K
R63
10K
R6410K
C4100nF
C522pF
C622pF
C722pF
C8
22pF
HUB IN L HUB IN 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
84U2:A
NE5532
R35100K
R36
1K
R37
1K
3
2
1
84
U4:A
NE5532
R38100K
C1347pF
C1447pF
C1547pF
C2247pF
C23
47pF
C2447pF
C2547pF
C2647pF
C2747pF
C2847pF
C2947pF
C3047pF
C3147pF
PREAMP OUT
PREAMP OUT
C3247pF
+15V
-15V-15V
+15V
3
2
1
84 U3:A
NE5532
R42100k
R4347K
5
6
7
U3:B
NE5532
R4447K
R45100K
3
2
1
84 U5:A
NE5532
R40100K
R4147K
5
6
7
U5:B
NE5532
R4647K
R47100K
+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
84 U6:A
NE5532
5
6
7
U6:B
NE5532
3
2
1
84 U7:A
NE5532
5
6
7
U7:B
NE5532
3
2
1
84 U8:A
NE5532
5
6
7
U8:B
NE5532
R5547K
R5647K
R6547K
R66100K
R67100K
R68100K
+15V
-15V
C51
10U NP 35V
C52
10U NP 35V
C53
10U NP 35V
R69100K
R70100K
R71100K
R7247K
R7347K
R7447K
+15V
+15V
+15V
-15V
-15V
-15V
C60
10U NP 35V
3
2
1
84 U18:A
NE5532
R76100K
R7747K
5
6
7
U18:B
NE5532
C62
10U NP 35V
R78100K
R7947K
-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
84 U9:A
NE5532
R75100K
R8047K
-15V
+15V
TAPE RETN R
5
6
7
U9:BNE5532
R81100K
R8247K
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
C1110U 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
C4347N PE 63V
C44
47N PE 63V
C5447N PE 63V
C5547N PE 63V
C56
47N PE 63V
C6447N PE 63V
C6747N 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
IN11
IN22
IN33
IN44
IN55
IN66
IN77
GND8
COM9
OUT710
OUT611
OUT512
OUT413
OUT314
OUT215
OUT116
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
Q1BC337
D11N4001
R11
10K
INPUT PCB - PREAMP PCB
TO PREAMP LEFT
TO PREAMP RIGHT
+15V
-15V
+5V
+9VLOGIC GND
PREAMP OUT L
PREAMP OUT R
C65100nF 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
C1822p
C1922p
R481k
R491k
R501k
R511k
R52100K
R53100K
R54100K
INPUT AMPLIFIER
+ 6 dB
INPUT L
INPUT R
C9
1000uF 10V EL
C10
1000uF 10V EL
R39100K
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
INP
UT
1
INP
UT
2
INP
UT
4
R32
LR
RL1
LRLRLR
RL2
R21
R5
U1
R12
R1
R2
R3
R4
R1
5
RL3 RL4
R13
U14
R57
R58
R59
R6
0
R6
1
R6
2
R6
3
R64
R6
R2
0
INP
UT
5
INP
UT
6IN
PU
T7
TAPE OUTR
LRL
RLR
LR
L
R TA
PE
RE
TU
RN
PREAMP OUT
RL5 RL6 RL7
RL8
R7
R30
R28
R29
R24
R2
5
R19
R16
R17
R18
R10
R31
R33
C1
U4
R5
3R52
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
R3
5
R39
C15
C2
2
C2
3
C24
C2
5
C2
6
C27
C28
C29
C30
C31
C32
C33
C34
R42
C3
8
R44
R45
C39
R43
U3
R41
C36
C41
U5
R46
R40
R47
C43 C44
L
C51
C52
C45
C46
C4
7
C5
3
C6
0
C6
2
U7
U8
U6
U18C54 C55 C56 C64
R67
R68
R66
R69
R70
R71
R72
R76
R78
R5
5
R56
R65
R7
3
R74
R77
R79
C65
AP16362/3
TO
HU
BP
CB
HUB SWITCHER
RELAY DRIVER LOGIC
C11
C12
C20
C21
C35C37 C40 C42 C48 C49 C50C57 C58 C59 C61C63
C66
C67
C68
C69C70
C71
C77
CN
6C
N7
CN
8
CN
9
CN
10
R14
R75
R80
R81
R82
R83
R84
U9
C9C10
TO
PR
EA
MP
PC
BC
N1
1
CN
9T
OP
RE
AM
PP
CB
R34
J1Q1
D1
FR
OM
FR
ON
TP
AN
EL
PC
B
INP
UT
3
C72P1
R85
CN1CN2
CN3CN4
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
RESISTORS48R,38R,41R,3R4mliFlateMW521.0R74
58R,43R,32R,22R,91R,9R6mliFlateMW521.0R001
81mliFlateMW521.0K1R4, R5, R8, R10, R15-R18, R26, R27, R31, R33, R36, R37, R48-R51
46R,36R,06R,95R,11R5mliFlateMW521.0K0126R,16R,85R,75R4mliFlateMW521.0K02
31mliFlateMW521.0K74R41, R43, R44, R46, R55, R56, R65, R72-R74, R77, R79, R80, R82
02mliFlateMW521.0K001R35, R38-R40, R42, R45, R47, R52-R54, R66-R71, R75, R76, R78, R81
41mliFlateMW521.0K022R1, R2, R6, R7, R12, R13, R20, R21, R24, R25, R28-R30, R32
CAPACITORS91C,81C,8C-5C6mm3=hctiP%01V05cimareCFp22
23C-22C,51C-31C41mm3=hctiP%01V05cimareCFp74
11mm5=hctiPretseyloP%01V36Fn74C16, C17, C33, C34, C43, C44, C54 -C56, C64, C67
27C,56C,3C,4C,2C,1C6mm5=hctiP%01V05cimareCFn001
10uF16V Non Polarised Electrolytic Radial (5.2mm) Pitch= 2.5mm
20C11, C12, C20, C21, C35, C37 C40, C42, C48-C50, C57-C59, C61, C63, C66, C68, C71, C77
10uF35V Non Polarised Electrolytic Radial (5.2mm) Pitch= 2.5mm
14C36, C38, C39, C41, C45-C47, C51-C53, C60, C62, C69, C70
1000uF10V Electrolytic Radial (10mm) Pitch= 5mm
2 C9, C10
SEMICONDUCTORSegakcaP82POS1U1yarrAhctiwSeugolanAFA3619CT674YP
PY1162 NE5532 Low Noise Dual Audio Op-Amp (SMT) 10 U3, U5-U9, U18, U2, U4, U14 SO8 PackageegakcaP61LID61U1srevirDnotgnilraD7A3002NLU8511YP
TRANSISTORSegakcaP29OT1Q1langiSllamSNPN52-733CB412YP
DIODES14OD1D1edoiD1004N1
MISCELLANEOUS5NC-1NC5ONOHPTEKCOSONOHPDAUQ
01NC,9NC2redaehlacitreVA-HX-B6BMM5.2TSJInput 1 audio conn, i/o conn
8NC,7NC280-VSS-001DYAW-8CFF0411YPVertical FFC conn, reverse-needle type
6NC101-VSS-001DYAW-01CFF3411YPVertical FFC conn, reverse-needle type
8LR-1LR8CDV99-2-EMYALER
Cambridge Audio Azur 840A Amplifier 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 DETECTPHONES GND
VOL 1 VOL 2 VOL 3 VOL 4 VOL 5 VOL 6 VOL 7 VOL 8
IN11
IN22
IN33
IN44
IN55
IN66
IN77
GND8
COM9
OUT710
OUT611
OUT512
OUT413
OUT314
OUT215
OUT116
U4
ULN2003A
IN11
IN22
IN33
IN44
IN55
IN66
IN77
GND8
COM9
OUT710
OUT611
OUT512
OUT413
OUT314
OUT215
OUT116
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 PCBA C
+15V
-15V
+5V
+9V
LOGIC GND
+5V
LOGIC GND
IR RX
PHONES DETECT
OVERLOAD
CLIP DETECT
DC OFFSET
MAINS FAIL
HIGH VOLUME
LOW VOLUME
ELBACELBAC
R19100K
LOGIC GND
ON/STBY LED CONTROL
ON/STBY LED
R20430R
LOGIC GND
R21430R
PHONES R
PHONES LIN1
1
IN22
IN33
IN44
IN55
IN66
IN77
GND8
COM9
OUT710
OUT611
OUT512
OUT413
OUT314
OUT215
OUT116
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
+5V3
OPT1
GND2
U10
TSOP18 IR RX
C19100n ceramic
IR RECEIVER
TSOP1836/37
+5V
LOGIC GND
IR RX
1
2
RL19:A
RELAY
BAL 3
R10022K
R10447R
C2010U 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
Q1BC337
Q2BC337
R8322K
R11010K
+5V
R1114K7
To enhance viewing, please print to A3 19
Cambridge Audio Azur 840A Amplifier
AP16365/4 Preamp PCB Schematic (Tone Control)
R14K7
R21K1
R31K1
R42K2
R52K2
C2680n poly
C3
10pF
SW1:B
SW-DPDT
DEFEAT
-15V
+15V
R64K7
R71K1R8
1K1
R92K2
R102K2
C5680n poly
C6
10p
SW1:A
SW-DPDT
DEFEAT
5
6
7
U1:B
NE5532
3
2
1
84
U2:A
NE5532
R1147k
R1247k
R1347k
R1447k
46
5
VR1:B
ALPHA RD902PF
13
2VR1:A
ALPHA RD902PF
46
5
VR2:BALPHA RD902PF
13
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
R162K2
R17
2K2
R18
2K2
TO VOLUME LEFT
+15V
-15V
6
7
8
RL19:C
RELAY
R22150R
R1052K2
R86390R
R872K2
R881K
R892K2
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
R90150R
R912K2
R92390R
R932K2
R941K
R952K2
2.5 dB 3.75 dB 5.5 dB
BALANCE CONTROL
+15V
-15V
R85
390R
R96
390R
R97150R
R98150R
3
4
5
RL15:B
RELAY
6
7
8
RL15:C
RELAY
5
6
7
U9:B
NE5532
TO VOLUME RIGHT3
2
1
84
U9:A
NE5532
3
4
5
RL16:B
RELAY
R9947K
R10147K
R10247K
R10347K
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
C1547N PE 63V
C2247N PE 63V
C36
100pF
C37
100pF
C38
1N PE 63V
C11N5 PE 63V
C41N5 PE 63V
C39
1N PE 63V
P1
PAD
GROUND REINFORCE
To enhance viewing, please print to A3 20
Cambridge Audio Azur 840A Amplifier
AP16365/4 Preamp PCB Schematic (Post Amp)
3
2
1
84
U12:A
NE5532
5
6
7
U12:B
NE5532
R75
390R
R76
390R
R7747K
VOL OUT LEFT
R78
390R
R79390R
R8047K
VOL OUT RIGHT
OUTPUT RELAY A
MAINS FAIL
R81
220R
R82
220R
PHONES L
PHONES R
+5V
+9V
LOGIC GND
PREAMP PCB - POWER AMP LEFT PCB CONNS
PREAMP PCB - POWER AMP RIGHT PCB CONN
CLIP DETECT
OVERLOAD
DC OFFSET
OVERTEMP
LOGIC GND
D35V1
OUTPUT RELAY B
INRUSH RELAY
MAINS ON/OFF RELAY
PHONES GND
R84 47K
HI = NORMAL
HI = NORMAL
HI = NORMAL
HI = NORMAL
1
2
3
4
5
6
7
8
9
10
11
12
CN5
FFC 12WAY
XD ON/OFF
XD ON/OFFLO = ON
+15V
-15V
POST AMPLIFIER
CLIP
OVERLOAD
DC OFFSET
OVERTEMP
AUDIO TO L POWER AMP
AUDIO TO R POWER AMP
LOGIC GND
+5V
+9V
PREAMP PCB - PSU PCB CONN
+15V
-15V
C23100nF ceramic
C26
100nF ceramic
C710u 25V
C3010u 25V
OPAMP DECOUPLING
R106
470RPREAMP OUT L
R10747K
R108
470RPREAMP OUT R
R10947K
1
2
CN10
JST 2.5MM B2B-XH-A
1
2
CN12
JST 2.5MM B2B-XH-A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
CN4
FFC 16WAY
SPEAKER TESTSPEAKER TEST
C16
10U NP 16V
C17
10U NP 16V
C31
47U NP 25V
C32
47U NP 25V
MAINS FAIL INMAINS FAIL IN
D21N4148
D11N4148
C33
18 pF
C34
15 pF
C3547N PE 63V
-15V
P2
PAD
GROUND REINFORCE
P3
PAD
To enhance viewing, please print to A3 21
Cambridge Audio Azur 840A Amplifier
AP16365/3 Preamp PCB Layout (Top Side)
RL1 RL2 RL3 RL4 RL6 RL7RL5 RL8 RL10 RL11 RL12RL9 RL13 RL14
PHONES
RL15RL16
R2
3
R24
R49
R50
VR1VR2
R25
R26
R51
R52
R5
3R
54
R5
6
R5
8
R5
9
R6
0
R6
1
R6
2
RL18RL17 RL19
R27
R2
8
R2
9
R3
0
R3
1
R3
2
R5
7
R3
3
R3
4
R3
5
R3
6
R3
7
R3
8
R3
9
R4
0
R4
1
R4
2
R4
3R
44 R45
R46
R47R48
R6
3
R6
4
R6
5
R6
6
R6
7
R6
8 R69
R7
0 R71
R7
2
R73R74
U5U4 U7
U10
U9
U12
C1
8
R9
9
C21R103
R7
7
R7
5
R7
6
R7
8
R7
9
R8
0
R8
1
R8
2
C1
6
C1
7
C2
4
C25R102
C15 C2
2
C2
3
C26U1
U2
R1
R2 R3
R4
R5
R6
R7
R8R
9
R10
R1
5
R1
6
R1
7R
18
R1
3
R14
R1
1
R1
2
C3
C6C8
SW1
C2
C5
C1
C4
C9
C10
C20
C1
9
R22
R8
5
R86
R8
7
R88
R89
R9
0R
91
R92
R93
R9
4
R95
R96
R97
R9
8
C11
C12
C1
3
C14
C27
C2
8
C2
9
CN1
CN5
R84D2
D3
Q1
R2
0
R2
1
R1
9
R1
00
R10
5
R1
04
R5
5
R1
01
C7 C30
C31C32
CN2
CN
3
CN6
CN
8
CN
9
CN10
CN11
CN12
D1
R106
R107
R108
R109
CN4
C33 C34
C3
5
Q2
R8
3
R1
10
C36
C37
C3
8
C39
R1
11
P1
P2
P3
To enhance viewing, please print to A3 22
Cambridge Audio Azur 840A Amplifier
AP16365/3 Pre-amp PCB Layout (Bottom Side)To enhance viewing, please print to A3 23
AP16368/4
AP No Value Description/Type Qty Component Ident Notes
RESISTORS37R,74R2mliFlateMW521.01R547R,84R2mliFlateMW521.0R15
89R,79R,09R,22R4mliFlateMW521.0R05107R,44R2mliFlateMW521.0R003
8mliFlateMW521.0R093R85, R86, R92, R96, R75, R78, R76, R79
27R,64R2mliFlateMW521.0R02649R,88R,36R,73R4mliFlateMW521.0K1
8R,7R,3R,2R4mliFlateMW521.01K117R,54R2mliFlateMW521.02K1
01mliFlateMW521.02K2R4, R5, R9, R10, R15-R18, R43, R69, R87, R89, R91, R93, R95, R105
111R,6R,1R3mliFlateMW521.07K416R,53R2mliFlateMW521.01K5
86R-46R,24R-83R11mliFlateMW521.0K0185R,65R,23R,03R4mliFlateMW521.0K02
26R,63R2mliFlateMW521.0K93
9mliFlateMW521.0K74R11-R14, R77, R80, R99, R101, R102, R103,
06R,43R2mliFlateMW521.0K5745R,82R2mliFlateMW521.0K2895R,33R2mliFlateMW521.0K06105R,42R2mliFlateMW521.0K00275R,13R2mliFlateMW521.0K00355R,92R2mliFlateMW521.0K02625R,62R2mliFlateMW521.0K028
35R,15R,72R,52R4mliFlateMW521.02M194R,32R2mliFlateMW521.01M5
401R,28R,18R3mliFlateMW52.0R7412R,02R2mliFlateMW52.0R034
801R,601R2mliFlateMW52.0R074011R1mliFlateMW52.0K01
001R,38R2mliFlateMW52.0K22901R,701R,48R3mliFlateMW52.0K74
91R1mliFlateMW52.0K001CAPACITORS
6C,3C2mm3=hctiP%01V05cimareCFp0143C1mm3=hctiP%01V05cimareCFp5133C1mm3=hctiP%01V05cimareCFp81
100pF Ceramic 50V 10% Pitch=3mm 2 C36, C37
1nFPolyester 63V 10%Pitch=5mm
2 C38, C39
1n5Polyester 63V 10%Pitch=5mm
2 C1, C4
53C,22C,51C,41C,31C,8C6mm5=hctiPretseyloP%01V36Fn74100nF Ceramic 50V 10% Pitch= 5mm 6 C19, C23, C26-C29680nF Polyester 100V 5% Pitch= 15mm 2 C2, C5
10uF25V Electrolytic Radial (5mm) Pitch= 2.5mm
2 C7, C30
10uF16V Electrolytic Radial (5.2mm) Pitch= 2.5mm
1 C20
10uF16V Electrolytic NP Radial (5.2mm) Pitch= 2.5mm
4 C16, C17, C18,C24,
47uF25V Electrolytic NP Radial (8.4mm) Pitch= 3.5mm
2 C31, C32
470uF10V Electrolytic Radial (8.4mm) Pitch= 3.5mm
4 C9-C12
1000uF10V Electrolytic Radial (10.4mm) Pitch= 5mm
2 C21, C25
PY259 NE5532 Low Noise Dual Audio Op-Amp 4 U1, U2, U9, U12 DIL08 Package81POSTsecalpeR01U1eludoMrevieceRRIXRRI81POST
egakcaP61LID7U,5U,4U3srevirDnotgnilraD7A3002NLU8511YPTRANSISTORS
29OT2Q,1Q252-733CB412YPDIODES
2D,1D2edoiDlangiSllamS8414N1
Cambridge Audio Azur 840A Amplifier Preamp PCB BOM
SEMICONDUCTORS
Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer.Please obtain these locally.
24
AP16368/4
AP No Value Description/Type Qty Component Ident Notes
Cambridge Audio Azur 840A Amplifier Preamp PCB BOM
.esaC53ODWm0043D1Wm0041V5edoidreneZ1V5C-97XZB
PY1156 RD902PF-20B6-30F-B5K-0C ALPHA B5K LINEAR POT 2 VR1, VR2 Retractable 9mm pot. With centre detent.
CK-6.35-04 7P HEADPHONE JACK SKT 1 CN1JST 2,5MM B2B-XH-A 2-way vertical header 2 CN10, CN12JST 2,5MM B6B-XH-A 6-way vertical header 1 CN3
PY1141 D100-SSV-12Flat-film connector 12-way, reverse-needle typeSingle row contacts
2 CN2, CN5
PY1140 D100-SSV-08Flat-film connector 8-way, reverse-needle typeSingle row contacts
4 CN6, CN8, CN9, CN11
PY1157 D100-SSV-16Flat-film connector 16-way, reverse-needle typeSingle row contacts
1 CN4
91LR-1LR91yaleRCDV9CDV99-2-EMA043nidesusA1WS1010-002020-2042TDPD-hctiwshsuP546YP
MISCELLANEOUS
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
AP16373/4 Power Amplifier (Right) Power Supplies & PSU PCB Schematic
TO MAIN TRANSFORMER
J1
BLUE/WHITE
J2
BROWN/BLACK
C11X1 10n
C12X1 10n
C13
X2 470N SUPPRESSION
F2
20MM T1AL
F3
20MM T1AL
D15
1N4002
D16
1N4002
D17
1N4002
D18
1N4002
J3
TERMINAL
BLACK
J4
TERMINAL
GREEN
J5
TERMINAL
GREYC15470u 35V
VI1
VO3
GN
D2 U2
7805
C1647u 16V
VI1
VO3
GN
D2
U37815
VI2
VO3
GN
D1
U47915
C18100u 25V
C19100u 25V
+5V PSU
C20100nF ceramic
PSU GND
+15V
-15V
PSU GND
MAINS ON/OFF RELAY
OPAMP SUPPLY
MICROCONTROLLER SUPPLY
TO POWER AMP SUPPLY LEFT
C23
X2 470N SUPPRESSION
ALTERNATIVE POSITIONS FOR
X-CAPS WITH DIFFERENT LEAD PITCHES
LIVE
NEUTRAL
+9V PSU
INRUSH CONTROLMAINS ON/OFF
+9V PSU
INRUSH CONTROL RELAY
C24
4700u 16V
RED
ORANGE
YELLOW
BROWN
BLUE
1
2
3
1
2
36 V
36 V
0V
117 DEG C
Primary
Secondary
230 V
0 V
GREEN4 38 V
5.5A
5.5A
100 mA
RED
ORANGE
YELLOW
1
2
3
36 V
36 V
0V
Secondary
GREEN4 38 V
5.5A
5.5A
100 mA
J6
TERMINAL
YELLOW
GREEN
VIOLET
BROWN
BLUE
3
4
5
1
2
17 V
17 V
0V
113 DEG C
Primary
Secondary 2
230 V
0 V
100mA
100mA
RED
ORANGE
1
2
7.5 V
0V
Secondary 1
500mA
RELAY SUPPLY
J7
TERMINAL
F4
20MM T1ALD19
1N4002
D20
1N4002
D21
1N4002
D22
1N4002
MAIN TRANSFORMER
STANDBY TRANSFORMER
J8
TERMINAL
J9
TERMINAL
C2515000uF-63V
C2615000uF-63V
+48V R
-48V R
J10
TERMINAL
J11
TERMINAL
J12
TERMINAL
ORANGE
BLACK
RED
J13
TERMINAL
D23
1N4002
C271000uF-50V
F7
T1A AL
LVD!
-51V R
POWER AMP SUPPLY RIGHT
3/64/5
RL3:B
ME14FW009HS
3/64/5
RL4:B
ME14FW009HS
1
2
RL3:A
ME14FW009HS
1
2
RL4:A
ME14FW009HS
R78
10R 10W WW
5
6
7
U1:B
LM393
D24
1N4002
MAINS FAIL IN
+5V IN
LOW = NORMAL
R794K7
R802K2
R8133K
C284U7 50V
+310 mV
MAINS FAIL
MAINS FAIL DETECT
(SEPARATE PCB)
MAINS ON/OFF
INRUSH
+15V
-15V
+15V
-15V
1
2
3
4
5
6
7
8
9
10
11
12
CN2
FFC 12WAY
PSU GND
C29 X1 10n
C30 X1 10n
C34X1 10n
C35X1 10n
C36
X1 10n
C37 X1 10n
F1
T6A3 AL
LVD!
6A3 for 230V
10A for 115V
J24
BROWN
LIVE
GROUND
NEUTRAL
MAINS IN
L
N
E
CN3
IEC-SOC
J25
BROWN
MAINS IN
LIVE
CHASSIS GND
PSU PCB
PSU PCB
PSU GND
+5V PSU+9V
0V
TO SHEET 1
R87
47K
J26BROWN
J27BROWN
NEUTRAL
NEUTRAL
D9
1N4001
D25
1N4001 R88
33R 1W
C17220uF 100V
MAINS SWITCH
ON REAR PANEL
+48V IN
-48V IN
0V INFROM RECTIFIER BOARD
C32
100nF ceramic
C22100nF ceramic
C31100nF ceramic
C33
4700u 16V
R95
2R2 0.5W
+600 mV
R7710K
AC
AC
MAINS FAIL IN
PSU GND
R96100K
MAINS FAIL RECTIFIER
GREEN
C141000U 35V EL
To enhance viewing, please print to A3 26
Cambridge Audio Azur 840A Amplifier
AP16373/4 Power Amplifier Right Channel
Q1MJE340
Q2MJE350
R110R
+48V R
-48V R
Q3
MPSA93
Q4MPSA93
Q5
MPSA93
Q6
MPSA93
Q7
MPSA43
Q8MPSA43
Q9MPSA43
Q10MPSA43
R2100R
R368R
R4100R
R5100R
R668R
R768R
R82K2
R956R
R101K8
R111K2
R1218R
R132K2
R14100R
Q11
BC337 R15
22K
C1
47U 16V
Q12MJE340
R17
100R
R18100R
R190R1
R200R1
R210R1
R220R1
R23
100R
R24100R
R250R1
R26
0R1
R27
2K2
NFB-R
NFB-R
R28
2R2 3WR2910R 3W
C20u1 POLYESTER
Q132SA1295
Q142SA1295
Q15
2SC3264
Q16
2SC3264
Q17
2SA1295
Q18MJE340
R30470R
R310R68
Q19
MPSA43
Q20
MPSA93
R3210R
R33
3K3
R34
3K6
D1
1N4148
D2
1N4148
-51V R R3547K
D3
1N4148
D4
1N4148
R364K7
R37100K
D5
1N4148
D61N4148
-48V R
+48V R
DC OFFSET
R3847K
HI = NORMAL
C322U 50V NP
DC OFFSET DETECT
R40
220R 3W C
R41
470R 1W C
PHONES OUT RIGHT
Q23MPSA43
R424K7
R4347K
R4447K
Q24MPSA93
R4547K
R464K7
D8
1N4148
R4747K
R48
22K CLIP
R49
16K
R5110K
R521K
R531K
R5416K
R55
16K
D101N4148
D111N4148
R56
2K2
R5722K
R58470R
R59470R
R601K1
R611K1
R62150R
R631K
R6410K
D121N4148
D131N4148
R6547K
3
4
5
RL1:B
RELAY
R6647K
C4220uF 80V
C5220uF 80V
R6722K
C747uF 35V
C847uF 16V
C947uF 16V
C10
100pF
Q27
MPSA93
Q28
MPSA93
Q29MPSA93
L1
1,7U 10A
+9V IN
1
2RL1:A
RELAY
R684K7
R6910K
3
2
1
84
U1:A
LM393
R701K8
+5V IN
R71
1M
Q31
BC337
D14
1N4002
R724K7
LOGIC GND
Q32
BC337
R73
10K
CLIP
DC OFFSET
+5V IN
PHONES OUT RIGHT
LOGIC GND
PREAMP PCB - POWER AMP PCB CONN
HI = NORMAL
R744K7
R7510K
R7610K
OUTPUT RELAY CONTROL
HI = NORMAL
RIGHT
3
4
5
RL2:B
RELAY
Q36
BC337
R3910K
1
2RL2:A
RELAY
Q33
BC337
D7
1N4002
R824K7
Q34
BC337
R83
10K
OUTPUT RELAY BOUTPUT RELAY A
R50
10KR85
10Kspare
Q35BC337
R1610K
R86
47K
J14RIGHT OUT A
J15GND RIGHT
J16RIGHT OUT B
J18LEFT OUT A
J20LEFT OUT B
J22
LEFT IN
6
7
8
RL2:C
RELAY
6
7
8
RL1:C
RELAY
LOW = NORMAL LOW = NORMAL
MAINS FAIL
OUTPUT RELAY A
OUTPUT RELAY B
13
2VR11K
D261N5404
D271N5404
R8910K
R9047K
C21
100nF ceramic
13
2
VR2
10K
R97100K
R98100K
D301N4148
D311N4148
R99
1K
C3810U NP 16V
+48V R
-48V R
DC OFFSET NULL
R100
22K
R93
2K7
D2812V
D29
12V
R942K7
R9175K
R9256K
R84
10K
BC337 MPSA43/93
E B C EBC
850R at 100degC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
CN1
FFC 16WAY
1
2
CN4
JST 2.5MM B2B-XH-A
AMP IN RIGHT
SPEAKER TEST SENSE
SPEAKER TEST SENSE
MAINS FAIL INMAINS FAIL IN
XD ON/OFF
CLIP
OVERLOAD
DC OFFSET
OVERTEMP
SPEAKER TEST SENSE
PHONES R
OUTPUT RELAY A
OUTPUT RELAY B
MAINS FAIL
+5V
+9V
LOGIC GND
PHONES GND
100deg C cutout
OVERTEMP DETECT
OVERTEMP
XD ON/OFF
+850mV
TH1
ZPP22 100DEG
POSITIVE THERMISTOR
-48V R
D321N4148
D331N4148
D34
1N4148
J17GND RIGHT
Q21MPSA43
Q22MPSA93
Q25MPSA43
R1011K
+5V IN
C39100pF
CHASSIS GND
C40
10U 63V EL
Q26MPSA43
C6
1000U 10V EL
C41
4n7 COG
To enhance viewing, please print to A3 27
Cambridge Audio Azur 840A Amplifier
AP16373/3 Power Amp (Right) & PSU PCB Layout (Top Side)To enhance viewing, please print to A3 28
Cambridge Audio Azur 840A Amplifier
AP16373/3 Power Amp Right & PSU PCB Layout (Bottom Side)To enhance viewing, please print to A3 29
AP16376/7
setoNtnedItnenopmoCytQepyT/noitpircseDeulaVoNPA
RESISTORS910R 0.125 W Metal Film 1 R702K2 0.125 W Metal Film 1 R804K7 0.125 W Metal Film 5 R36 , R66, R68, R72, R74,10K 0.125 W Metal Film 6 R16, R69, R75, R76, R77, R85,22K 0.125 W Metal Film 1 R4833K 0.125 W Metal Film 1 R8147K 0.125 W Metal Film 2 R43, R90,100K 0.125 W Metal Film 1 R961M 0.125 W Metal Film 1 R7110R 0.25 W Metal Film 2 R1, R3218R 0.25 W Metal Film 1 R1256R 0.25 W Metal Film 1 R968R 0.25 W Metal Film 3 R3, R6, R7100R 0.25 W Metal Film 9 R2, R4-R5, R14, R17, R18, R23, R24,150R 0.25 W Metal Film 1 R62470R 0.25 W Metal Film 3 R30, R58, R591K 0.25 W Metal Film 6 R52-R53, R63, R80, R99, R1011K1 0.25 W Metal Film 2 R60, R611K2 0.25 W Metal Film 1 R11,1K8 0.25 W Metal Film 1 R10,2K2 0.25 W Metal Film 4 R8, R13, R27, R56, 2K7 0.25 W Metal Film 2 R93, R943K3 0.25 W Metal Film 1 R343K6 0.25 W Metal Film 1 R334K7 0.25 W Metal Film 3 R42, R46, R82
10K 0.25 W Metal Film 8R39, R50, R51, R64, R73, R83, R84, ,
R89,16K 0.25 W Metal Film 3 R49, R54, R5522K 0.25 W Metal Film 5 R15, R57, R67, R81, R100
47K 0.25 W Metal Film 8R35, R38, R44, R45, R47, R65, R66,R86
56K 0.25 W Metal Film 1 R9275K 0.25 W Metal Film 1 R91100K 0.25 W Metal Film 4 R37, , R97, R98
S88R1mliFlateMW1R33 pace off PCBS14R1nobraCW1R074 pace off PCB
0R1 3 W Wire Wound 6 R19-R22, R25, R26 S pace off PCBS13R1dnuoWeriWW35R1 pace off PCB
2R2 3 W Wire Wound 1 R28Inductor damping res.No need to stand off PCB
10R 3 W Wire Wound 1 R29220R 3 W Carbon 1 R40CAPACITORS
100pFCeramic 100V 10% Pitch= 3mm
1 C10, C39
10nF X1 CAPMEX103K300A02 Pitch =10mm
3 C11, C12, C20
100nFCeramic 100V 10% Pitch= 5mm
2 C18, C21
100nF Polyester Pitch= 10mm 1 C2
10uF16V Electrolytic Radial Non Polarised (6.4mm) Pitch= 5mm
2 C20, C38
10uF63V Electrolytic Radial(5mm diam) Pitch= 3.5mm
1 C40
22uF50V Non Polarised Electrolytic Radial (5.2mm)Pitch= 2.5mm
1 C3
Cambridge Audio Azur 840A Amplifier Power Amp Right PCB BOM
Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer. Please obtain these locally.
30
AP16376/7
setoNtnedItnenopmoCytQepyT/noitpircseDeulaVoNPA
Cambridge Audio Azur 840A Amplifier Power Amp Right PCB BOM
47uF16V Electrolytic Radial (5mm) Pitch= 2.5mm
3 C1, C8, C9
47uF35V Electrolytic Radial (10mm) Pitch= 2.5mm
1 C7
220uF100V Electrolytic Radial (12.5mm) Pitch= 5mm
1 C17
220uF80V Electrolytic Radial (10.4mm) Pitch= 5mm
2 C4
1000uF10V Electrolytic Radial (10.4mm) Pitch= 5mm
1 C6
1000uF50V Electrolytic Radial (13.4mm) Pitch= 5mm
1 C27
15000uF63V Electrolytic Radial (35.4mm) Pitch= 10mm
2 C25, C26
SEMICONDUCTORS
PY1152 LM393APLow-offset dual Comparator, A-version for low offset voltage
egakcaP80LID1U1
TRANSISTORSPY1148 MJ 621OT81Q,21Q,1Q3rotsisnarTrevirDNPN043EPY1150 MJ 621OT2Q1rotsisnarTrevirDPNP053EPY021 MPSA93 PNP Small Signal 10 Q3-Q6, Q20, Q22, Q24, Q27-Q29 TO92WIDE MPSA92 ma y be usedPY013 MPSA43 NPN Small Si gnal 8 Q7-Q10, Q19, Q21, Q23, Q26, Q25, TO92WIDE MPSA42 ma y be usedPY214 BC337-25 NPN Small Si gnal 9 Q11, Q31-Q36 TO92
PY1149 2SA1295 PNP Power Audio 3 Q13, Q14, Q17 MT200002TM61Q,51Q2oiduArewoPNPN4623CS27411YP
DIODES
1N4148 Small Signal Diode 18D1-D6, D8, D10-D13, D17, D18, D30 -D34
DIODE-IN4148
1N4002 General Purp akcaP14OD,32D,41D,7D3reifitceReso ge1N5404 General Purp akcaP72OD72D,62D2reifitceReso ge Clamp diodes
.esaC53ODWm00492D,82D2Wm004edoidreneZV2121C-97XZBMISCELLANEOUS
olanimoN1HT1ROTSIMREHTEVITISOPE105A122PZ perating temp 100 deg C
08-1950100-150 1.7uH 10A INDUCTOR 1 L110 turns of 1.5mm copper wire, diameter 20mm, length approx 20mm
MULTITURN PRESET 1K
Top adjust. Footprint 9.5 x 4.5 mm
1 VR1Set quiescent current. Insert so adj screw next to R17
MULTITURN PRESET 10K
Top adjust. Footprint 9.5 x 4.5 mm
1 VR2DC trimInsert so adj screw next to Q11
SS-7B-1 Wong Feng IEC-SOCKET 1 CN3
PY1151 D100-SSV-16
FFC CONNECTOR 16-WAY, Vertical "Reverse needle" type, Single row of contacts
1 CN1
4031-050100-001 Fuseholder 20mm 1 F7T1A AL FUSE-20MM 1A anti sur ge, 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
setoNtnedItnenopmoCytQepyT/noitpircseDeulaVoNPA
RESISTORSBCPffoecapS59R1mliFlateMW5.02R2
10R 10W8.5X53MMWireWound
BCPffoecapS.rotsiserhsurnI87R1BmhO01JW01NK
97R1mliFlateMW52.07K478R1mliFlateMW52.0K74
CAPACITORS10nF X1 Capacitor
MEX103K300A02 Pitch =10mm 6 C29, C30, C34-C37
100nF Ceramic 100V Pitch= 5mm 4 C20, C22, C31, C32
470nFX2 Suppression CAPBOX 27.5X13 Pitch= 27.5mm orBOX 22.5X10 Pitch= 22.5mm
1 C13 or C23 dependant on pitch
4u750V Electrolytic Radial (5.2mm) Pitch= 2.5mm
1 C28
47uF16V Electrolytic Radial (5mm) Pitch= 2.5mm
1 C16
100uF25V Electrolytic Radial (6mm) Pitch= 2.5mm
2 C18,C19
470uF35V Electrolytic Radial (10.4mm) Pitch= 5mm
1 C15
1000uF35V Electrolytic Radial (10.4mm) Pitch= 5mm
1 C14
4700uF16V Electrolytic Radial (16.4mm) Pitch= 5mm
mm52THGIEHMUMIXAM33C,42C2
egakcaP022OT2U1rotalugeRraeniLA1tloV55087egakcaP022OT3U1rotalugeRraeniLA1tloV515187egakcaP022OT4U1rotalugeRraeniLA1tloV51-5197
DIODES1N4002 General Purpose Rectifier 9 D15-D22, D24 DO41 Package
egakcaP14OD52D,9D2reifitceResopruPlareneG1004N1
T1AL1A antisurge fuse 20mm (low breaking capacity)
3 F2 - F4
T6.3 AL or T10A6.3A or 10A antisurge fuse 20mm (low breaking capacity)
1 F1T6A3 for 230VT10A for 115V
4031-050100-001
,4,3,2,1F4mm02redlohesuF
4034-000030-000
1FredlohesufsniamnoecalP1F1revocredlohesuF
D100-SSV-12FFC CONNECTOR 12-WAY, Vertical "Reverse needle" type, Single row of contacts
1 CN2
PY1154 RELAY ME14FRELAY ME14F-9H16S SPST 16A 250 Vac9V coil
.syalerlortnochsurni&sniaM4LR,3LR2
SEMICONDUCTORS
MISCELLANEOUS
Cambridge Audio Azur 840A Amplifier PSU PCB BOM
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
AP16693/5 Power Amplifier Left Channel
Q1MJE340
Q2MJE350
R110R
+48V
-48V
Q3
MPSA93
Q4MPSA93
Q5
MPSA93
Q6
MPSA93
Q7
MPSA43
Q8MPSA43
Q9MPSA43
Q10MPSA43
R2100R
R368R
R4100R
R5100R
R668R
R768R R8
2K2
R956R
R101K8
R111K2
R1218R
R132K2
R14100R
Q11
BC337 R15
22K
R1610K
C1
47U 16V
Q12MJE340
R17
100R
R18100R
R190R1
R200R1
R210R1
R220R1
R23
100R
R24100R
R250R1
R260R1
R27
2K2
NFB-L
NFB-L
R28
2R2 3WR2910R 3W
C2
0u1 POLYESTER
Q132SA1295
Q142SA1295
Q15
2SC3264
Q16
2SC3264
Q17
2SA1295
Q18MJE340
R30470R
R310R68
Q19MPSA43
Q20
MPSA93
R3210R
R33
3K6
R34
3K3
D11N4148
D2
1N4148
-51V
R35
47K
D3
1N4148
D4
1N4148
R364K7
R37100K
D5
1N4148
D61N4148
LOGIC GND
LOGIC GND
-48V
+48V
DC OFFSET
HI = NORMAL
C322U 50V NP
DC OFFSET DETECT
R40
220R 3W C
R41
470R 1W C
PHONES L
Q23MPSA43
R424K7
R4347K
R4447K
Q24MPSA93
R4547K
R464K7
D8
1N4148
R4747K
R48
22K
CLIP
R49
16K
R50
47K
R5110K
R521K
R53
1K
R5416K
R5516K
D101N4148
D111N4148
R56
2K2
R5722K
R58470R
R59470R
R601K1
R611K1
R62150R
R631K
R6410K
D121N4148
D131N4148
R6547K
LEFT OUT
R66
10K
C4220uF 80V
C5220uF 80V
R6722K
C747uF 35V
C847uF 16V
C947uF 16V
C10
100pF
Q27
MPSA93
Q28
MPSA93
Q29MPSA93
L1
1,7U 10A
R684K7
R6910K
5
6
7
U1:B
LM393
R701K8
+5V
R71
1M
3
2
1
84
U1:A
LM393
100deg C cutout
CLIP
DC OFFSET
PREAMP PCB - LEFT POWER AMP PCB CONN
HI = NORMAL
R754K7
POSITIVE THERMISTOR
LEFT
MAINS FAIL IN
J5
TERMINAL
J6
TERMINAL
13
2VR11K
D71N5404
D91N5404
C18100n ceramic
R7275K
R7356K
R742K7
D1412V
D1612V
R762K7
13
2
VR2
10K
R78100K
R79100K
D17
1N4148
D18
1N4148
R80
1K
R81
22K
C2010U NP 16V
+48V
-48V
DC OFFSET NULL
1
2
CN3
JST 2.5MM B2B-XH-A
AMP IN LEFT
PHONES L
+5V
LOGIC GND
XD ON/OFF
CLIP
OVERLOAD
DC OFFSET
OVERTEMP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
CN2
FFC 16WAY
SPEAKER TEST SENSE
Q31
MPSA93
R8247K
R83
10K
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
CN1
FFC 16WAY
LEFT POWER AMP TO
RIGHT POWER AMP CONNECTOR
PHONES R
OUTPUT RELAY A
OUTPUT RELAY B
MAINS FAIL
D19 1N4148
D20
1N4148
+5V
+9V
LOGIC GND
PHONES GND
R8510K
R86100R
R8710R
R88
100K
R894K7
SPEAKER TEST
R90
100R
D21
1N4002
D22
1N4002
R91 100R
LO = NO SHORT
SPEAKER SHORT CIRCUIT TEST SYSTEMOVERTEMP DETECT
XD ON/OFF
NORMAL = HI
BC337 MPSA43/93
E B C EBC
850R at 100degC
XD ON/OFF
CLIP
OVERLOAD
DC OFFSET
OVERTEMP
SPEAKER TEST
OUTPUT RELAY A
OUTPUT RELAY B
MAINS FAIL
+5V
+9V
LOGIC GND
MAINS FAIL IN
PHONES R
PHONES GND
50mW
50mW
210mW
50mW
PHONES L
TH1
ZPP22 100DEG
-48V
D23
1N4148
D241N4148
D251N4148
J7
TERMINAL
OUTPUT GROUND
E BC
MJE340,350
C14100pF
P1PAD
CHASSIS GND
Q21MPSA43
Q22MPSA93
Q26MPSA43
Q25MPSA43
Looking at pins
123
C61000U 10V EL
C15
4n7 50V COG
To enhance viewing, please print to A3 33
Cambridge Audio Azur 840A Amplifier
AP16693/5 Power Amplifier Left Power Supplies
+48V
-48V
J1
TERMINAL
J2
TERMINAL
J3
TERMINAL
POWER AMP SUPPLY LEFT
YELLOW
ORANGE
RED
RED
ORANGE
YELLOW
BROWN
BLUE
1
2
3
1
2
36 V
36 V
0V
115 DEG C
Primary
Secondary
230 V
0 V
GREEN4 38 V
5.5A
5.5A
100 mA
RED
ORANGE
YELLOW
1
2
3
36 V
36 V
0V
Secondary
GREEN4 38 V
5.5A
5.5A
100 mA
J4
TERMINAL
D15
1N4002
C111000uF 50V
F1
T1A AL
LVD!
-51V
MAIN TRANSFORMER
TO POWER AMP SUPPLY RIGHT
+-
C1215000U 63V
+-
C1315000U 63V
C17220uF 100V
R38
33R 1W
GREEN
+48V IN
-48V IN
+48V IN
0V IN
FROM RECTIFIER BOARD
To enhance viewing, please print to A3 34
Cambridge Audio Azur 840A Amplifier
AP16693/5 Power Amp PCB Board Layout (Top Side)
AP
16694/4
Q13 Q14 Q15 Q16 Q17
Q2
R21 R22
R59
R64
R66
Q18
R30R31
R40
R41
C12
C13
U1
R68
R69
R70
R71
Q21
Q22
R37
C3D3
D5
R42R44
Q23
R45
R46
Q24
D8
R47
J1
J2
J3
J4
R25R26
J5
J6
OV
ER
TE
MPDC
OF
FS
ET
CLIP
DE
TE
CT
FIX1
FIX
3
FIX
2
R62
R60
R61
R65
R35
Q28
Q29
D6
D4
Q27
R48R43
R38
R36
R63
D12
D13
Q10
Q11
Q9
D1
Q20
Q25
R6
R7
R8
R9
R15
R13
Q5
Q6
Q7
Q8
C6
Q19
C9
C10
R23
R24
R34
R32
R49
R51
R53
R55
C7
C1
C8
Q3
R2
R4
R5
D2
R14
R27
R52
R54
R33
R56
R57
R67
R1
R17
R10
R11
R12
R3
Q4
D10
Q1
Q12
C2
C4
R29
R18
R19
L1
R20
C17
R28
R58
C11
D7 D9
D15
R50
R75
R16
AP
16694/4
RE
DB
LA
CK
OR
AN
GE
OU
TP
UT
GN
D
V+
0V
V-
D11
GR
EE
N38V
AC
BIA
SV
R1
R72
R74D14
R73
R76
D16
C18
CN3
D17
D18
VR
2
R78R79R80
R81
C20
F1
CN
1
CN
2
D21
D22
R86
R85
R87
R88
R91
R83
Q31R82
D19
D20
Q26
R89
R90
SP
KR
TE
ST
TH1
D24
D25
D23
RE
DB
LK
J7
GN
DB
LK
C14
P1
To enhance viewing, please print to A3 35
Cambridge Audio Azur 840A Amplifier
AP16693/5 Power Amp PCB Board Layout (Bottom Side)To enhance viewing, please print to A3 36
AP16696/9
setoNtnedItnenopmoCytQepyT/noitpircseDeulaVoNPA
RESISTORS10R 0.125 W Metal Film 1 R87100R 0.125 W Metal Film 3 R86, R90, R91910R 0.125 W Metal Film 1 R704K7 0.125 W Metal Film 6 R36, R42, R46, R68, R75, R8910K 0.125 W Metal Film 3 R69, R83, R8522K 0.125 W Metal Film 1 R48,47K 0.125 W Metal Film 4 R43, R44, R45, R50100K 0.125 W Metal Film 2 R37, R881M 0.125 W Metal Film 1 R7110R 0.25 W Metal Film 2 R1, R32,18R 0.25 W Metal Film 1 R1256R 0.25 W Metal Film 1 R968R 0.25 W Metal Film 3 R3, R6, R7
100R 0.25 W Metal Film 10R2, R4, R5, R14, R17, R18, R23, R24,
150R 0.25 W Metal Film 1 R62470R 0.25 W Metal Film 3 R30, R58, R591K 0.25 W Metal Film 4 R52, R53, R63, R80, 1K1 0.25 W Metal Film 2 R60, R611K2 0.25 W Metal Film 1 R11,1K8 0.25 W Metal Film 1 R102K2 0.25 W Metal Film 4 R8, R13, R27, R562K7 0.25 W Metal Film 2 R74, R763K3 0.25 W Metal Film 1 R343K6 0.25 W Metal Film 1 R3310K 0.25 W Metal Film 4 R16, R51, R64, R66,16K 0.25 W Metal Film 3 R49, R54, R5522K 0.25 W Metal Film 4 R15, R57, R67, R8147K 0.25 W Metal Film 5 R35, R47, R65, R73, R8256K 0.25 W Metal Film 1 R7375K 0.25 W Metal Film 1 R72100K 0.25 W Metal Film 2 R78, R79,
BCPffoecapS83R1mliFlateMW1R33BCPffoecapS14R1mm81=hctiPnobraCW1R074
0R1 3 W Wire Wound 6 R19-R22, R25, R26 Space off PCBBCPffoecapS13R1dnuoWeriWW35R1
2R2 3 W Wire Wound 1 R28Inductor damping res.No need to stand off PCB
BCPffoecapS.SERLEBOZ92R1dnuoWeriWW3R01
BCPffoecapS04R1mm5.22=hctiPnobraCW3R022
CAPACITORS
100pFCeramic 100V 10% Pitch= 3mm
2 C10, C14
100nFCeramic 100V 10% Pitch= 5mm
1 C18
100nF Polyester 10% Pitch= 10mm 1 C2
10uF16V Non Polarised Electrolytic Radial (5.2mm) Pitch= 2.5mm
1 C20
22uF50V Non Polarised Electrolytic Radial (5.2mm) Pitch= 2.5mm
1 C3
Cambridge Audio Azur 840A Amplifier Power Amp Left PCB BOM
Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer. Please obtain these locally.
37
AP16696/9
setoNtnedItnenopmoCytQepyT/noitpircseDeulaVoNPA
Cambridge Audio Azur 840A Amplifier Power Amp Left PCB BOM
47uF35V Electrolytic Radial (10mm) Pitch= 2.5mm
1 C7
47uF16V Electrolytic Radial (5mm)Pitch= 2.5mm
3 C1, C8, C9
220uF80V Electrolytic Radial (10.4mm) Pitch= 5mm
2 C4, C5
220uF100V Electrolytic Radial (12.5mm) Pitch= 5mm
1 C17
1000uF10V Electrolytic Radial (10.4mm) Pitch=5 mm
1 C6
1000uF50V Electrolytic Radial (13.4mm) Pitch= 5mm
1 C11
15000uF63V Electrolytic Radial (35.4mm) Pitch= 10mm
2 C12, C13
PY1152 LM393APDual differential comparator, A-version for low offset voltage
80LID1U1
TRANSISTORS
PY1148 MJE340 NPN Power Transistor 4 Q1, Q12, Q18, Q30 TO126621OT2Q1rotsisnarTrewoPPNP053EJM0511YP
PY021 MPSA93 PNP High Voltage 11Q3-Q6, Q20, Q22, Q24, Q27-Q29, Q31
TO92WIDE MPSA92 may be used
PY013 MPSA43 NPN High Voltage 9Q7-Q10, Q19, Q21, Q23, Q25, Q26
TO92WIDE MPSA42 may be used
29OT11Q1langiSllamSNPN52-733CB412YPPY1149 2SA1295 PNP Power Audio 3 Q13, Q14, Q17 MT200PY1147 2SC3264 NPN Power Audio 2 Q15, Q16 MT200
DIODES
1N4148 Small Signal Diode 18D1-D6, D8, D10-D13, D17-D20, D23-D25
72OD9D,7D2reifitceResopuPlareneG4045N11N4002 General Pupose Rectifier 3 D15, D21, D22 DO41ZENER 12V 400mW
Zener BZX79-C12 2 D14, D16 400mW DO35 Case.
Cged001pmetgnitarepolanimoN1HT1ROTSIMREHTEVITISOPE105A122PZMULTITURNPRESET 1K
Top adjust. Footprint 9.5 x 4.5 mm
1 VR1Set quiescent current. Insert so adj screw next to R12
MULTITURNPRESET 10K
Top adjust. Footprint 9.5 x 4.5 mm
1 VR2DC trimInsert so adj screw next to R78
PY1151 D100-SSV-16FFC CONNECTOR 16-WAY, Vertical "Reverse needle" type, Single row of contacts
2 CN2
T1A AL 1 Amp 20mm antisurge fuse 1 F1
4031-050100-001 Fuseholder 20mm 1 F1
08-1950100-150 1.7uH 10A INDUCTOR 1 L110 turns of 1.5mm copper wire, diameter 20mm, length approx 20mm
AP16831/3 To drawing Main heatsink 1 Q13, 14, 15, 16, 17
SEMICONDUCTORS
MISCELLANEOUS
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
AP163771/3 Hub PCB Schematic
3
2
1
84
U1:A
NE5532
5
6
7
U1:B
NE5532
C1
100nF
+24V
R1
47R
R2
47R
R3
12K
R4
4K7
C2
10pF
R5
12K
C3
10pF
ABUS GND
R612K
C4
10uF 25V
C5
10uF 25V
ABUS GND
Q1BC327
R7
100R
R8
100R
R94K7
R1010K
R11
22K
C6
100nF
R12 100R
VI1
VO3
GN
D2
U27812
C7100nF
C8
10uF 25V
ABUS GND
R13
10R 2W
D3
1N4004
+12V
R14
4K7
+12V
3
2
1
84
U3:A
NE5532
5
6
7
U3:B
NE5532
C12
100nF
+24V
R15
47R
R16
47R
R17
12K
C13
10pF
R18
12K
C14
10pF
ABUS GND
C15
10uF 25V
C16
10uF 25V
ABUS GND
ABUS GND
R
GND
L
GND
IR
STATUS
+24V
0V
+5V3
OPT1
GND2
U4
TSOP1837 IR RECEIVER
R1947R
C17
100nF
C18
10uF 16V
R20470R
D5
1N4148
D6
1N4148
D7
BZX79C2V7
D8
BZX79C2V7
R2110K
ABUS GND
R22
100R
R23
100R
R2427KR25
27K
ABUS GND
CN4IR EMITTER OUTPUTS
R26
4K7
R27
4K7
R2810K
ABUS GND
R2912K
SIG GND
C20
47U 25V
R3012K
C21
47U 25V
R3112K
C22
47U 25V
R32
4K7
R33
4K7
SIG GND
STATUS
IR
HUB - INPUT PCB CONN
LOGIC GND
SIG GND
Q2BC337
+5V
LOGIC GND
ABUS GND
RIGHT
LEFT
SWITCHER DATA OUT
SWITCHER CLOCK OUT
SWITCHER STROBE OUT
LOGIC GND
+5V
RA7/OSC1/CLKIN16
RB0/INT6
RB1/RX/DT7
RB2/TX/CK8
RB3/CCP19
RB4/PGM10
RB511
RB6/T1OSO/T1CKI12
RB7/T1OSI13
RA0/ANO17
RA1/AN118
RA2/AN2/VRef1
RA3/AN3/COMP12
RA4/T0CKI/CMP23
RA6/OSC2/CLKOUT15
RA5/MCLR/THV4
VSS
5V
DD
14
U5 PIC16F627-04/P
LOGIC GND
C23100nF
LOGIC GND
+5V
R35
100R
R36
100R
R3727KR38
27K
ABUS GND
CN6IR EMITTER OUTPUTS
Q3BC337
+12V
R394K7
ABUS GND
C24
47U 25V
R40
4K7
R41
4K7
+24V IN
78L12
IN OUT
LOOKING AT LEADS
C28
47uF 25V
C25
47U 25V
C26
47U 25V
C27
47U 25V
F1
POLYFUSE 1-1A
F2
POLYFUSE 1-1AR4210K
R4310K
C1010uF 16V
GND1+G
+2
-
3
CN7
XLR FEMALE
GND1+G
+2
-
3
CN8
XLR FEMALE
IR OUTIR IN
IR IN
IR IN
CN9
JACK-CKX-3.5-12
3.5mm JACK
+5
V3
OP
T1
GN
D2
U6
TSOP1836 IR RECEIVER
+5V
LOGIC GND
R44
220R
1
2
3
U7:A
4011
VDD=+5V
R45
220R
1
2
6
5
4NC
3
U8
OP4N25
5
6
4
U7:B4011
VDD=+5V
VSS=LOGIC GND
8
9
10
U7:C
4011
VDD=+5V
12
13
11
U7:D
4011
VDD=+5V
R46220K
R4710K
R48
10K
+5V
LOGIC GND
R492R2
R50
100R
Q4BC337
R5110K
LOGIC GND
C11100nF
LOGIC GND
1
3
2 CN2
RICCO PCB JACK
C29100nF
INPUT 1 LEFT +
INPUT 1 LEFT -
XLR GND
INPUT 1 RIGHT +
INPUT 1 RIGHT -
LEFT
RIGHT
INPUT 1: BALANCED INPUTS
SIG GND
+5V
LOGIC GND
C30100nF CERAMIC
FEMALE
RS232 & IR CABLE FROM FRONT PANEL PCB
TX
RX
9
10
11
12
13
14
15
16
CN1:B
VERT2RJ45
GND17
GND218
GND319
GND420
GND521
GND622
CN1:C
VERT2RJ45
CHASSIS GND
A-BUS A
A-BUS B
1
2
3
4
IR IN
36K
36K
GND
GND
MCLR HUB
PGM
MCLR HUB
RS232 CONN
PROGRAM_DATA
PROGRAM_CLK
PROGRAM_DATA
PROGRAM_CLK
R3447R
C3110uF 16V
C32100nF
C3347pF
ABUS GND
C3447pF
ABUS GND
C3547pF
ABUS GND
C3647pF
ABUS GND
4
3
2
1
CN16
CONN-2.5PH-SIL4
RX
TX
GND
CHAS
+24V
37 kHz
36 kHz
TOP OF CONN
BOTTOM OF CONN
Q5
BC337
R5210K
R53100K
Q6BC337
R5410K
PIC TX
BLOCK
HUB CLOCK OUT
HUB DATA OUT
HUB CLOCK OUT
HUB DATA OUT
1
2
3
4
5
6
7
8
9
10
12
13
11
CN15
FFC 13WAY
LOGIC GND
PGM
IR receiver
A
K
D2
CA IR DEMODULATOR
IR receiver
A
K
D1
CA IR DEMODULATOR
1
2
3
4
5
6
CN5
JST 2,5MM B6B-XH-A
XLR GND
CONN TO INPUT PCB
1
2
3
4
5
6
7
8
9
10
CN3
FFC 10WAY
HUB IN RHUB IN L
RIGHT
RIGHT
LEFT
LEFT
R
GND
L
GND
IR
STATUS
+24V
0V
STATUS LINE DRIVER
R5510K
ABUS GND
XLR GND
1
2
3
4
5
6
7
8
CN1:A
VERT2RJ45
R56390K
R57100K
LOGIC GND
+24V IN
+24V IN
+24V DETECT
1
2
5
CN10:AAV2-8,4-14/EC
3
4
5
CN10:BAV2-8,4-14/EC
C39
1N 50V NP0
R5810K
+5V
F3
POLYFUSE 1-1A
CHASSIS GND
R5947K
R6047K
C9220U 35V EL
C19220U 25V EL
C37220U 25V EL
To enhance viewing, please print to A3 39
Cambridge Audio Azur 840A Amplifier
AP16377/3 Hub PCB Layout (Top Panel)
AP16378/3
AP16378/3
TX
RX
GN
D
CH
AS RS232
To enhance viewing, please print to A3 40
Cambridge Audio Azur 840A Amplifier
AP16377/3 Hub PCB Layout (Bottom Panel)To enhance viewing, please print to A3 41
AP16380/5
setoNtnedItnenopmoCytQepyT/noitpircseDeulaVoNPA
RESISTORS61R,51R,2R,1R4mliFlateMW521.0R74
9mliFlateMW521.07K4R4, R9, R14, R26, R27, R32, R33, R40, R41
01mliFlateMW521.0K01R10, R28, R42, R43, R47, R48, R51, R52, R54, R55
13R-92R,81R,71R,6R,5R,3R8mliFlateMW521.0K2111R1mliFlateMW521.0K22
83R,73R,52R,42R4mliFlateMW521.0K7265R,35R2mliFlateMW521.0K001
75R1mliFlateMW521.0K09394R1mliFlateMW52.02R2
43R,91R2mliFlateMW52.0R74
8mliFlateMW52.0R001R7, R8, R12, R22, R23, R35, R36, R50
54R,44R2mliFlateMW52.0R02202R1mliFlateMW52.0R07493R1mliFlateMW52.07K4
85R,15R,12R3mliFlateMW52.0K0106R,95R2mliFlateMW52.0K74
BCPffoecapS31R1dnuoWeriWW2R01CAPACITORS
41C,31C,3C,2C4mm3=hctiP%01V05cimareCFp0163C-33C4mm3=hctiP%01V05cimareCFp74
01mm5=hctiP%01V05cimareCFn001C1, C6, C7, C11, C12, C17, C23, C29, C30, C32
10uF16V Electrolytic Radial (6.4mm)Pitch =2.5mm
3 C10, C18, C31
10uF25V Electrolytic Radial (6.4mm)Pitch =2.5mm
5 C4, C5, C8, C15, C16
47uF25V Electrolytic Radial (5.2mm)Pitch =2.5mm
8 C20-C22, C24-C28
220uF25V Electrolytic Radial (5.2mm)Pitch =2.5mm
2 C19, C37
220uF35V Electrolytic Radial (8.4mm)Pitch =3.5mm
1 C9
SEMICONDUCTORS80LID3U,1U2pmApOlaudesionwoL2355EN952YP
CD4011BETexas Instruments Quad NAND gate IC
NCB1104DCimeslanoitaNsievitanretlA7U1
022OT2U1022OT,rotalugerA1,V21218760LID8U1rotalosiotpO52N4PO4411YP
PIC16F627 -04/P PIC Microcontroller 1 U5DIL18Contact Audio Partnership Service Department
)7381POSTsecalpeR(V81POST4U1eludoMrevieceRRIzhK7373843POST7001YP)6381POSTsecalpeR(V81POST6U1eludoMrevieceRRIzhK6363843POST557YP
TRANSISTORS29OT1Q1langiSllamSPNP52-723CB912YP29OT6Q-2Q5langiSllamSNPN52-733CB412YP
DIODES1N4004 General Purpose Rectifier diode 1 D3
PY962 MV50640 2D,1D2DELdeRNO ALTERNATIVE LED TO BE USEDFitted as part of assembly with AP17339/3
1N4148 Small Signal Diode 2 D5, D6BZX79C2V7 Zener Diode 2.7 Volts 2 D7, D8MISCELLANEOUSAJ-600-21-F-4-B Allsun Dual vertical RJ45 1 CN1RDC-020-05 DC power in connector 1 CN2
STUPTUORETTIMERI6NC,4NC2)neerg(tekcoskcajmm5.3lauD01-5.3-XKCJY-5033P*030 Female XLR socket with gold pins 2 CN7, CN8CKX-3.5-12 Single 3.5mm jack socket (black) 1 CN9
Cambridge Audio Azur 840A Amplifier Hub Board BOM
Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer. Please obtain these locally.
42
AP16380/5
setoNtnedItnenopmoCytQepyT/noitpircseDeulaVoNPA
Cambridge Audio Azur 840A Amplifier Hub Board BOM
AV2-8,4-14/ECDual phono socket with EMC gndOrange inserts
1 CN10
PY1143 D100-SSV-10Vertical FFC conn, reverse-needle typesingle-row contacts 10-way
1 CN3
PY1142 D100-SSV-13Vertical FFC conn, reverse-needle typesingle-row contacts 13-way
1 CN15
mrofelbacnnoc232SRroF61NC1HXepytredaehlacitrevTSJ4LIS-HP5.2-NNOCtupnidecnalabroF5NC1HXepytredaehlacitrevTSJ6LIS-HP5.2-NNOC
AP17339/3 IR Receiver Housing 2 Fit over D2/U4 and D1/U6
3F,2F,1F3U011P03DLRA1-1ESUFYLOPPOLYFUSE 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
AP17575/2 Rectifier PCB Schematic
F1
T6A3 AL
LVD!
F2
T6A3 AL
LVD!
J1
TERMINAL
J2
TERMINAL
J3
TERMINAL
YELLOW
ORANGE
RED
C110nFC2
10nF
C310nF
J4
TERMINAL
J5
TERMINAL
+48V OUT
-48V OUT
J6
TERMINAL GREEN
RED
ORANGE
YELLOW
BROWN
BLUE
1
2
3
1
2
36 V
36 V
0V
115 DEG C
Primary
Secondary
230 V
0 V
GREEN4 38 V
5.5A
5.5A
100 mA
RED
ORANGE
YELLOW
1
2
3
36 V
36 V
0V
Secondary
GREEN4 38 V
5.5A
5.5A
100 mA
MAIN TRANSFORMER
TO POWER AMP SUPPLY RIGHT
VIOLET
BLUE
31
4 2
BR1
BRIDGE BR-254
To enhance viewing, please print to A3 44
Cambridge Audio Azur 840A Amplifier
AP17575/2 Rectifier Board PCB Board Layout (Top Side)
PARTNERSHIP 2005AUDIO
To enhance viewing, please print to A3 45
Cambridge Audio Azur 840A Amplifier
AP17575/2 Rectifier Board PCB Board Layout (Bottom Side)To enhance viewing, please print to A3 46
AP17578/2
AP No Value Description/Type Qty Component Ident Notes
CAPACITORS10nF X1 Capacitor MEX103K300A02 Pitch =10mm 3 C14-C16DIODES
Bridge Rectifier BR254 400PIV 25A blk metal case 1 BR1Rectifier is not soldered to PCB until PCB is fixed to amplifier heatsink
MISCELLANEOUS
T6A3 AL6.3 Amp 20mm anti surge Fuse, low breaking capacity
2 F1, F2
2F,1F2mm02redlohesuF100-001050-1304
Cambridge Audio Azur 840A Amplifier, Rectifier PCB BOM
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 LayoutDetails
TC9163AF – Input PCB (U1)
NE5532Input PCB - (U2, U3, U4, U5, U6, U7, U8, U9,U14 & U18)A-BUS PCB – (U1 & U3)Pre-Amp PCB – (U1, U2, U9 & U12)
ULN2003AInput PCB - (U16)Pre-Amp PCB – (U4, U5 & U7)
BC337Input 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)
TSOP18Pre-Amp PCB - (U10)
PIC16F877A-I/SPFront Panel PCB
48
74HC4094Front Panel PCB - (U2, U3, U4, U5 & U6)
BC327Front Panel PCB - (Q1 & Q8)A-BUS PCB – (Q1)
LM393APRight Hand Power Amp PCB - (U1)Left Hand Power Amp PCB – (U1)
MJE340Right Hand Power Amp PCB - (Q1, Q12 &Q18)Left Hand Power Amp PCB – (Q1, Q12, Q18 &Q30)
MJE350Right Hand Power Amp PCB - (Q2)Left Hand Power Amp PCB – (Q2)
MPSA93Right 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)
MPSA43Right 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
2SA1295Right Hand Power Amp PCB - (Q13, Q14 &Q17)Left Hand Power Amp PCB – (Q13, Q14 &Q17)
2SC3264Right Hand Power Amp PCB - (Q15 & Q16)Left Hand Power Amp PCB – (Q15 & Q16)
CD4011BEA-BUS PCB - (U7)
7812A-BUS PCB - (U2)
OP4N25A-BUS PCB - (U8)
PIC16F627-04/PA-BUS PCB - (U5)
TSOP34837A-BUS PCB - (U4)
TSOP34836A-BUS PCB - (U6)
50
AP16396/2 Azur 840A Amplifier Technical Description
Start: 11 Aug 05 Version 2 Updated: 29 Nov 05
Revision historyV1->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
---==========================================---
NOTESLogic signals are in upper case, thus; MAINS FAILReferences to “the PIC” or “the main PIC” are to the main housekeeping PIC on the front panel PCBunless otherwise stated.
51
The Power Supply PCBThis carries:
Power supplies for everything except power ampsMains on/off and inrush control switching relaysX2 capacitorThe mains-fail detect circuit
There are four power supply rails:
+15V Opamp supply-15V Opamp supply+9V Relay supply+5V 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 withR78 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 theamplifier goes from ON to standby, RL3 simply opens.
The front panel PCBThis carries:
The main PICThe volume rotary encoder and control switches.The LCD displayShift registers for driving the relaysThe 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. Ithandles all the control functions of the amplifier except for those on the A-BUS hub PCB, which aredealt with by another PIC on that board.
PIC pins handling amplifier conditions:
Pin Normal ActiveSpeaker short-circuit detect 7 LOW HIGH Active= short foundPhones detect 27 HIGH LOW Active= Phone jack inMains fail 28 LOW HIGHDC offset protection 29 HIGH LOWOvertemperature protection 30 HIGH LOWOverload protection 33 HIGH LOWClip detection 34 HIGH LOW
The LCD display module interfaces to the front panel PCB through CN2. Display data from the PIC isclocked serially into shift register U2 and sent to the LCD module in byte-wide parallel format. TheLCD 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 thePIC into 32 latched outputs. Four shift registers (U3,U4,U5,U6) are connected so that the serial inputenters the first register and is clocked through and out of its serial output into the serial input of thesecond register. Changing any output requires 32 bits to be clocked through the registers by the SERIALCLOCK signal. When SERIAL STROBE goes high the data is latched in each register to give a staticoutput. Data appears at the outputs only when the SHIFT REG ENABLE line is high. This line is keptlow at start-up to prevent random data at the outputs, and only goes high when the PIC has initialisedthe 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 fromRS232 levels (nominally +/-9V) to PIC levels (+5V/0V). Q4 handles outgoing RS232 data, level shifting itto give a +15V/0V output.
The main PIC is reprogrammed by holding the standby/ON button in when the mains power is turnedon. The word DOWNLOAD appears on the LCD. A PC running a Windows program is used todownload 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 buffersInput select relaysTape out bufferInput amplifier +6 dBHub input switcherRelay drivers
The input PCB has one stereo input (Input 1) that accepts both balanced and unbalanced signals, and sixmore 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 andvolume 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 mainamplifier input by the CMOS switching IC U1. This is controlled by serial data from the microcontrolleron 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. Theeighth relay is controlled by Q1.
53
The Preamplifier PCBThe preamplifier PCB carries:
The tone controls and DIRECT switchRelay balance controlBalance control buffer AmplifierRelay volume controlVolume control post amplifierRelay driversON/standby LED controlThe IR receiverHeadphone 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 ofthe central position. This is implemented by switching in combinations of three attenuator sections; thefirst is R97,R22,R105, the second R85,R87 and the third R88,R86,R89. These are switched in or out byrelays RL17, RL18 and RL19. When none of these relays are energised the balance network gives thefirst step of attenuation due to R97.When RL15 is energised the balance attenuator network is inserted into the left channel and the stereoimage is shifted to the right. When RL16 is energised the balance attenuator network is inserted into theright channel and the stereo image is shifted to the left.
The balance control attenuation steps are:
Step NominaldB
0 01 -1.32 -2.53 -3.44 -4.55 -5.56 -6.87 -7.78 -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 stepalso 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 isconnected to either the input signal rail or ground by its associated relay. (RL1 to RL14) The resistancesare typically made up two resistors to obtain the exact desired value. This represents a potential dividerthat 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. Thevolume control can be set to ramp up from zero to the stored setting at power-up, and to ramp downon going to standby; this is an option on the configuration menu.
54
The volume control and balance relays are driven from three 8-bit serial-in parallel-out (SIPO) shiftregisters on the front panel PCB. The logic signals come in on CN6, CN8 and CN9, and control the 7-way 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 PSUboard is not being used to power front-panel and preamp PCBs, and thus permits the LED control to work properly in this condition.
Headphone socketThe phones Left and Right signals come in from the two amplifier PCBs. When a jack is inserted in tothe 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 PCBsThe power amplifier boards are very similar. The left channel is described in detail, and the right channeldescription deals only with the differences.
Power Amplifier Left PCBThis description is subdivided as follows:
Input stageDC trim system.The Voltage Amplifier StageBiasing systemOutput stageThe XD Crossover Displacement systemPower suppliesOverload protectionClip detectionDC offset protectionOver-temperature protectionSpeaker short-circuit detectionHeadphone output attenuator
DC trim system.VR2 and its associated components make up the DC trimming network; this allows to output DC offsetto 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 withthe signal, into the output point of a conventional Class-B output stage, with the result that thecrossover point is displaced away from the no-signal voltage. The displacement current is madeproportional 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 zerowith the output fully positive.
55
The XD control circuit is a differential pair of transistors with one input grounded and the other drivenby the main amplifier output voltage, scaled down appropriately by R63, R64. The drive to the displaceris taken from collector load R58, to give the required phase inversion. R59 is present simply to equalisethe 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 currentthrough 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. TheQ18, Q17 structure acts as a unity-gain voltage stage with 100% voltage feedback from Q17 collectorto 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 isdone by Q26. Normally the XD ON/OFF signal coming in on Pin 9 of CN2 is high, (+5V) so Q31 isheld off and Q26 is off. When XD is disabled, XD ON/OFF goes low and Q31 is turned on via R83. Q26is then turned on via R82. The equivalent to Q26 on theright power amp PCB is also turned on by theconnection through Pin 10 of CN1.
Power suppliesThe power supply for the power amplifier consists of three rails. The voltages given here are nominal asthey 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 aswithout it the negative-going voltage-swing of the voltage-amplifier stage is limited, and negative clippingoccurs before positive clipping.
Overload protection.The amplifier is protected against short-term overloads by dual slope VI limiting. The upper half of theoutput 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 theextra current-limiting circuit Q11, R15, R16. When the voltage across R9 becomes excessive, Q11 turnson 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 lowercurrent 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 theOVERLOAD 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 eitheramplifier output occurs. Very brief episodes of clipping are ignored. The volume stays reduced and doesnot ramp back up in the absence of clipping.The clip detect system is based on Q23, Q24 and associated components. Normally both transistors areon, 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 supplyvoltage 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 ofeither 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 protectionPositive thermistor TH1 is mounted on the main amplifier heat-sink. At approx 100degC, its resistancehas 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 amountof 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 detectionWhen the amplifier goes from standby to ON, the speaker outputs are checked for short-circuits beforethe output relays are closed. This system is centred on comparator U1:A but also involves circuitry onthe Right Amplifier PCB.Short-circuits are checked for by passing a small current through the loudspeaker impedances andmonitoring 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 andright, A and B, in parallel so the resulting voltage is not large. It is sent to the left amplifier PCB, wherecomparator U1:A compares it with a reference voltage of 5mV set up by potential divider R85,R87. Ifthe combined loudspeaker resistance is below 1 Ohm, the output of U1:A goes high, signalling a shortcondition to the main PIC.
Headphone output attenuatorThe headphone output attenuator comprises R40 and R41. The headphone socket is on the preamp PCB.
Power Amplifier Right PCBThis description is subdivided as follows:
The right power amplifier The output relays Output relay control systemMains-fail detect system
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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 systemThe mains-fail detect system is based on comparator U1:B. It takes the MAINS FAIL IN signal from thePSU board (see above) and compares it with a reference voltage of +310 mV set up by potential dividerR81,R80. When MAINS FAIL IN drops below this threshold, the output goes high. This signal, MAINSFAIL, is sent to the PIC via CN1, pin 9.
A-BUS Hub BoardThis board carries the following functions:
The XLR sockets for the balanced input mode of Input 1Two A-bus outputsHub IR inputHub microcontrollerHub Power supplyIR 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 itto 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 biassupply is derived from the +12V supply rail.
The hub amplifiers have their own ground (ABUS GND) to prevent ground loops, and this use of thedifferential amplifier performs a change of reference so a clean signal reaches the hub amplifier seven ifthe 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 commandsSend input select data to main PICControl Hub input switcher to prevent thumps on 840A outputControl 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; theIR 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 Zenerdiodes D7, D8 reject low-level noise on the incoming IR lines. The combined IR signals are buffered byemitter-follower Q3, and sent out via CN4, CN6 to drive external IR emitters. Incoming modulated IRsignals for input select are also sent to the Hub PIC U5; LED D2 is driven from Q3, and points at IRreceiver U4, the pair being housed in a small light-tight enclosure. The demodulated IR is then appliedto 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.
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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 theLCD. The active 840A input is denoted by a round marker; the active Hub input is denoted by a circlearound it.
The Hub PIC controls the A-bus status line so that it is high when the 840A is powered and low when itis not. It also implements the “all off” feature; when this command is received from one keypad the HubPIC 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, andhas no connection with the Hub IR system.Modulated IR data (as an electrical signal) enters via 3.5mm jack CN9, and drives LED D1, whichilluminates 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 IRIN signal to the main PIC via CN15. When it reaches the front panel PCB (see above) it is further OR-ed 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 isolatesthe 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-invertthe signal and preserve its phase. It is then OR-ed with the PIC TX signal by U7:B, and buffered byU7:C and U7:D to provide enough drive for the IR output. R50 protects the output and C11,R49 isolatethe IR output ground.IR commands can also be generated by the 840A itself. These come from the main PIC as the signal PICTX 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 combineto give garbled data. This is done by the BLOCK signal from the main PIC, coming in via CN15. Whenthis is high it turns on Q6 and prevents external IR commands from reaching Q5.
The Rectifier PCBThis 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 theincoming AC lines from the transformer.
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Operating Instructions SummaryThis is a very brief guide to enable all the controls and menus of the 840A to be accessed if the fullmanual 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 automaticallyreturn to volume mode after 5 seconds.
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To rename inputs:Press and hold the relevant input select button. Letters in the name are selected by turning the volumeknob.
To access the configuration menu:Press and hold the Mode button. These are the menu options:
Clip detector on/offLCD brightness (off/dim/bright)Input gain trim menu accessVolume ramp on/offVolume 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/offXD system on/offCounter accessPress 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 onthe LCD.
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840A Software Loading Instructions
1) Push and hold the “Standby / On” on the front of the 840A whilst turning on the power switch atthe 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 followingwindow will be displayed:
4) Choose the comm port the RS232 cable is attached to and click OK. The following window willbe 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 ABUSprocessor will be programmed followed bythe Main processor. Once the programming hasfinished, “Programming Completed!” will be displayed and the 840A will reset.
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Gallery Court Hankey Place London SE1 4BB UK Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233
840A________________________________________________________________________________
Notes.
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