Amended Input Circuit Schematic (March 2005) - Cambridge Audio 640A Service Manual

CN4:B
DUAL PHONO
U6:B
5
R9
L CH OUT
7
6
56R
NE5532
+15V C2
U6:A 47n poly
3
R8
R CH OUT
1
2
56R
NE5532 C3
47n poly
-15V
+45V
+30V
+15V
R55 R48
680R 100R
CN22
1
2
3
4
H4 2.54mm
R56
100R
-15V
To enhance viewing, please print to A3
Cambridge Azur 640A Amplifier
L
R28 R27 R23 R21
220K 220K 220K 220K
R22
220K
R51 R30 R31 R29 R26 R25 R24
1k 1k 1k 1k 1k 1k 1k
+12V
C22
D1
10u 25V
12V Zener 400mW
C23
10u 25V
D2
12V Zener 400mW
-12V
AP12714/7 Input Select PCB Schematic
C26
100n Pre Only
J8
R53
100R Pre Only
CHASSIS
+30V R32
CN8 CN7
1 6 220K
2 5
3 4
4 3
5 2
6 1
HEADER6 HEADER6
PHONO I/O PHONO PSU
LK2
R17
-12V
+12V C4 C5
R34 R35 R36
R6
1k 1k 1k
220K
220K
47n poly 47n poly
U1
1
VDD VEE
28 2
R1 L1
27 3
R2 L2
26
4
R3 L3
25
5
R4 L4
24 6
R-COM1 L-COM1
23 7
R5 L5
22
8
R6 L6
21
9
R-COM2 L-COM2
20 10
R7 L7
19 11
R8 L8
18 12
R-COM3 L-COM3
17
13
DATA ST
16
14
CK VSS
15
NJU7313AL
CN1
clk
dat 1
2
HEADPHONE
3
4
H4 2.54mm
R
CN4:A
DUAL PHONO
R33 R40 R41
220K 220K 220K
R50
220K
R37 R38 R39 R49
1k 1k 1k 1k
C25
5
10u 16V NP 6
R16 R15
100K 100K
R14
10k
+15V
C14
U3:A
3
10u 16V NP 2
R19 R18 NE5532
100K 100K
-15V
R7 R5
10k 10k
C12
22p
R CH IN
U3:B
7
NE5532
R10
10k
C13
C7
22p
47n poly
1 L CH IN
C8
47n poly
41