A) Cd Servo Circuit - Panasonic SA-VK31GC Service Manual

18.1. (A) CD Servo Circuit

OPTICAL PICKUP CIRCUIT
E GND
Vref F
A Vcc
NC B
C3
0.22
LPD LD
GND LDG
VR1
TRACKING
COIL
FOCUS
COIL
C7335
0.1
C7334
10V220
36
38
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SCHEMATIC DIAGRAM - 1
CD SERVO CIRCUIT
R7601
4.7
Q7601
VCC
1 1
2 F 2
R7650
C1 E
3 3
5.6
0.47
W7035
LD
4 4
0
5 5
LD GND
C7614
6 GND 6
6.3V100
C7613
B
7 7
0.1
GND
8 8
(GUARD)
9 A 9
10 10
VREF
W7023
11 LPD 11
0
GND
12 12
(GUARD)
13 T- 13
14 T+ 14
15 F- 15
16 F+ 16
CN7001
28
14 15 16 17 18 19 20
IC7003
13 12 11 10 9 8 7
IC7003
AN8739SBTE2
FOCUS COIL/
TRACKING COIL/
TRAVERSE MOTOR/
SPINDLE MOTOR DRIVE
35
M
37
M
W7033 W7031 W7030
0 0 0
W7034 W7032
0 0
: CD-DA SIGNAL LINE
: +B SIGNAL LINE
Q7601
W7036
B1ADCF000001
0
LASER POWER DRIVE
W7046
0
1 2 3 4 5 6 7
IC7001
AN22004A-NF
SERVO AMP
32 31 30 29 28 27 26
C7112
2700P
C7111 W7015
2700P 0
39 41
R7107 R7108
150K 150K
40 42
21 22 23 24 25 26
R7336
6 5 4 3 2 1
R7335 R7325
100 390
C7315
0.039
C7352
8200P
R7327 R7349
3.9K
R7323
53
SA-VK31GC / SA-VK31GS
C7103
6.3V100
C7104
0.1
30
R7152
R7151
15K
4.7K
8 9 10 11 12 13 14 15 16
25 24 23 22 21 20 19 18 17
C7110
C7147
560P
470P
R7144
39K
C7149
2200P
C7142
0.047
34 31
R7106 R7104
1K 1K
33 32
10
C7338 C7339
3300P 0.01
R7329 R7328
3.9K 3.9K
4.7K
R7331
6.8K 6.8K