Cambridge Audio Azur 840A v2 Amplifier
P
re Amp Circuit Board - R
elay Logic
1
2
RL1:A
ME3-
9S
1P2T Relay
1
2
RL2:A
ME3-
9S
1P2T Relay
1
2
RL3:A
ME3-
9S
1P2T Relay
1
2
RL4:A
ME3-
9S
1P2T Relay
1
2
RL5:A
ME3-
9S
1P
2T Relay
1
2
RL6:A
ME3-
9S
1P2T Relay
1
2
RL7:A
ME3-
9S
1P
2T Relay
1
2
RL8:A
ME3-
9S
1P
2T Relay
+9V
+9V
VOL 1
V
OL 2
V
OL 3
V
OL 4
V
OL 5
V
OL 6
V
OL 7
V
OL 8
IN
1
1
IN
2
2
IN
3
3
IN
4
4
IN
5
5
IN
6
6
IN
7
7
GND
8
CO
M
9
OUT7
10
OUT6
11
OUT5
12
OUT4
13
OUT3
14
OUT2
15
OUT1
16
U4
ULN
2003A
N
Darlington Driver
IN
1
1
IN
2
2
IN
3
3
IN
4
4
IN
5
5
IN
6
6
IN
7
7
GND
8
CO
M
9
OUT7
10
OUT6
11
OUT5
12
OUT4
13
OUT3
14
OUT2
15
OUT1
16
U5
ULN
2003A
N
Darlington Driver
+9V
1
2
RL9:A
ME3-
9S
1P
2T Relay
1
2
RL10:A
ME3-
9S
1P
2T Relay
1
2
RL11:A
ME3-
9S
1P
2T Relay
VOL 9
V
OL 10
VOL 11
© COPYRIGHT
The Audio Partnership
Gallery Court
Hankey Place
LON
DON
SE1 4BB
Tel :
+44 (0)171
940 2200
Fax : +44
(0)171 940 2233
1
2
RL12:A
ME3-
9S
1P2T Relay
1
2
RL13:A
ME3-
9S
1P2T Relay
1
2
RL14:A
ME3-
9S
1P
2T Relay
3
1
L
O
V
2
1
L
O
V
VOL 14
+9V
+9V
LOG
IC
+5V
LOG
IC
PHONES DETECT
IN
1
1
IN
2
2
IN
3
3
IN
4
4
IN
5
5
IN
6
6
IN
7
7
GND
8
CO
M
9
OUT7
10
OUT6
11
OUT5
12
OUT4
13
OUT3
14
OUT2
15
OUT1
16
U7
ULN
2003A
N
Darlington Driver
+9V
1
2
RL15:A
ME2-
9B
High Sensitive 2P2T Relay
1
2
RL16:A
ME2-
9B
High Sens
itiv
e 2P2T Relay
1
2
RL17:A
ME2-
9B
High Sens
itive 2P2T Relay
BAL 1
B
AL 2
B
AL L
1
2
RL18:A
ME2-
9B
High Sensitive 2P2T Relay
BAL R
MAIN
S ON
/OF
F
RELAY
IN
RUSH RELAY
1
2
RL19:A
ME2-
9B
High Sens
itiv
e 2P2T Relay
BAL 3
C27
100nF
50V
Mono Ceramic
+9V
RELA
Y
C28
100nF
50V
Mono Ceramic
C29
100nF
50V
Mono Ceramic
RELA
Y
RELA
Y
RELA
Y
1
2
3
4
5
6
7
8
CN6
8 Way
FFC Connector
From Front Panel PCB
1
2
3
4
5
6
7
8
CN8
8 Way
FFC Connector
From Front Panel PCB
1
2
3
4
5
6
7
8
CN9
8 Way
FFC Connector
From Front Panel PCB
OUTP
U
T
RELAY A
OUTP
U
T
RELAY B
1
2
3
4
5
6
7
8
9
10
11
12
CN2
12 Way
FFC Connector
To CN1
on Front
Panel
1
2
3
4
5
6
CN11
6 Way
FFC Connector
To CN7
on Input
PCB
SPEAKER TEST
IN
RUSH RELAY
MAIN
S ON
/OF
F
RELAY
1
2
3
4
5
6
7
8
9
10
CN5
10 Way
Straight Header
+15V
-15V
LOG
IC
+5V
+9V
MAIN
S FAIL
C7
100uF
25V
Electrolyti
c
C15
100uF
25V
Electrolyti
c
+15V
-15V
Plane
RELA
Y
Abus sw
itch Str
Abus Switch Data
Abus Switch Clk
PH D GND
RELA
Y
Abus
sw
itch Str
Abus Switch Data
Abus Switch Clk
C30
100uF
16V
Electrolyti
c
C33
100uF
16V
Electrolyti
c
C34
100uF
16V
Electrolyti
c
1
2
RL20:A
ME2-
9B
High Sens
itiv
e 2P2T Relay
+9V
Q7
MP
SA14
NPN Darlington
RELA
Y
D1
Rectifie
r
1N
400
4
Volume 6
Tone Defeat
Mains Relay
Inrush Relay
Balance L
MAIN
S FAIL
Balance R
Balance 3
Balance 2
Mains
F
a
il
Balance 1
Volume 5
Volume 4
Volume 3
Volume 1
Volume 2
Volume 7
Volume 14
Volume 13
Volume 12
Volume 11
Volume 10
Volume 8
Volume 9
1
2
3
4
5
6
7
8
CN7
8 Way
FFC Connector
RELA
Y
+9V
SPEAKER TE
ST
OUTP
U
T
RELAY A
OUTP
U
T
RELAY B
HP Mute
1
2
3
4
5
6
7
8
CN16
8 Way
FFC Connector
To CN18
Upper
PCB
1
2
3
4
5
6
7
8
CN17
8 Way
FFC Connector
To CN19
Upper PCB
+9V
+9V
Vol
9
-R
Vol 10 -
R
Vol
8
-R
Vol 11 -
R
Vol 12 -
R
Vol 14 -
R
Vol 13 -
R
Vol 2 -R
Vol 3 -R
Vol 1 -R
Vol 4 -R
Vol 7 -R
Vol 5 -R
Vol 6 -R
R134
2k
7
1/8W Metal Film
26
