Cambridge Azur 340A Intergrated Amplifier
AP14476/3 Main PCB Schematic (Power Amplifiers)
R8
1K
+
10
-
9
OUT
3
V-
4
GND
7
MUTE
8
V+
1
V+2
5
NC2
6
NC
2
NC3
11
U6
LM3886
C2
100nF 100V
L1
+28V
-28V
R9
27K
R48
RES2W 2R2
R56
RES2W 10R
R57
27K
R58
22K
C3
10U 16V
C22
47U 16V
C23
100U 16V NO FIT
POWER AMPLIFIER LEFT
R65
1K
+
10
-
9
OUT
3
V-
4
GND
7
MUTE
8
V+
1
V+2
5
NC2
6
NC
2
NC3
11
U7
LM3886
C36
100nF 100V
L2
+28V
-28V
R66
27K
R67
RES2W 2R2
R68
RES2W 10R
R69
27K
R70
22K
C37
10U 16V
C38
47U 16V
C39
100U 16V NO FIT
POWER AMPLIFIER RIGHT
POWER AMP LEFT
POWER AMP RIGHT
C40
100U 50V HR
C41
100U 50V HR
C42
100U 50V HR
C43
100U 50V HR
MUTE
R71
47K
Q1
BC327
+5V
R72
47K
R73
47K
R74
47K
Q2
BC337
AMP MUTE
AMP MUTE
-28V
HI = MUTE
SW2:A
SW-DPDT
SW2:B
SW-DPDT
SPEAKER B ON/OFF
RSW1
RSW2
R
L
GND
LSW1
LSW2
2
4
3
1
7
8
5
CN1
HEADPHONE JACK
R61
220R 3W C
R62
470R 1W C
R63
220R 3W C
R64
470R 1W C
1
2
CN2:A
SPKR 4-WAY
4
3
CN2:B
SPKR 4-WAY
5
6
CN2:C
SPKR 4-WAY
8
7
CN2:D
SPKR 4-WAY
LEFT: SPEAKER A
LEFT: SPEAKER B
RIGHT
RIGHT
3
4
5
RL1:B
12V 8A RELAY
6
7
8
RL1:C
12V 8A RELAY
1
2
RL1:A
12V 8A RELAY
360R
Q3
BC337
D9
1N4001
R75
220R
1/2 W
+20V
R76
4K7
OUTPUT RELAY
R77
47K
R78
47K
SPEAKER A
SPEAKER B
Q4
BC327
Q5
BC337
D10
1N4148
D11
1N4148
R79
1K8
R80
3K3
D12
1N4148
D13
1N4148
D14
1N4148
D15
1N4148
-15V
+15V
DC OFFSET
R12
3K9
R13
2K2
D16
5V1
HI = NORMAL
C54
22U 50V NP
C55
22U 50V NP
DC OFFSET DETECT
40W 8 Ohms
= 17.9 Vrms
R53
270K
R55
270K
R81
470R
R82
470R
TIP = LEFT
RING = RIGHT
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