Panasonic SA-AK78 Service Manual page 27

SCHEMATIC DIAGRAM-1
OPTICAL PICKUP
CIRCUIT
LASER DIODE
6
8
11
12
4
9
10
5
2
3
1 2 3 4
8 7 6 5
TRACKING
COIL
FOCUS
COIL
IC703
AN8739SBE2
FOCUS COIL/
TRACKING COIL/
TRAVERSE MOTOR/
SPINDLE MOTOR DRIVE
15 16 17 18 19 20 21
C735
0.1
C734
10V220
12 9 8
14 13 11 10
C737
0.1
36
M
M702
TRV MOTOR
38
C736
0.1
37
M
M701
SP MOTOR
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CD SERVO CIRCUIT
C701
6.3V33
R701
4.7
Q701
2.7V
Q701
3.2V
((2.3V))
2SA1037AKSTX
CN701
LASER POWER
DRIVE
VCC
0.9V
1
1
PDF ((2V))
2 2
PDE
3
3
LD
4
4
LD GND
5
5
GND
6 6
NB
C713
7
7
GND
0.1
(GUARD)
8
8
NA
9
9
VREF
10
10
LPD
11
11 GND
(GUARD)
12 12
T-
13 13
T+
14
14
C750
F-
0.1
15
15
F+
16 16
IC701
AN8839NSBE1
SERVO AMP
C751
0.1
22 23 24 25 26 27 28
IC703
7 6 5 4 3 2 1
C715
2700P
C752
1500P
R735 R725
35
100
390
R715
R724
R727
1K
15K
3.9K
27
: + B Line
: CD Signal Line
PLAY
0.6V J 701
P-P
RF
C703
0.5us. 0.2V/DIV
6.3V100
29
C704
0.1
1 2 3 4 5 6 7 8 9 10 11 12
C714
6.3V100
IC701
28 27 26 25 24 23 22 21 20 19 18 17 16
PLAY
0.1V
C710
C747
P-P
180P 120P
2ms 0.1V/DIV
R744
C712
120K
0.1
C749
C711
2200P
0.1
C742
0.027
R708
22K
R706 R704
R707
1K
1K
39K
C738 C739
1500P
0.01
R729 R728
3.9K 3.9K
R749
4.7K
R723 R731
6.8K
6.8K
13 14
15
0V
((3.2V))
42
PLAY
0.6V
P-P
2ms 0.1V/DIV
33
SA-AK78