43
3. Tracking & Sled Circuit
3-1-1. Block Diagram (Tracking Following)
Disc
Motor unit
Optical
Pick-up
HOP-8521T
A1~A4
(F, E)
TE
TE1
R706
C708
GND
ENC1
SL2IN
SL1IN
TVDN
TVDP
TE
ADC
Tracking
Compensator
DAC
TRD
TACT+
TACT-
IC101
HD153721
IC701
IC602
HD62604
BU2507
S-DAC
MPPO
(A+D)-(B+C)
G
HAVC
LS
to
V14
5
33
41
L
P
F
L
P
F
SPPO
DVD : (A1+A4)-(A2+A3)
CD : (EF1+EF2)-(EF3+EF4)-K*(E-F)
Sled
Compensator
PWM
TVDN
19
TVDP
ENC1
18
15
A+
A-
B+
B-
SLED MOTOR
Unit
TRD
R614
IC501
BD7907
TACT+
TACT-
EN1
EN2
DRVCTL1
DRVCTL2
REF
1.65V
TRKIN
39
42
20
21
31
30
SL1IN
2
SL2IN
3
SL1IN
SL2IN
A-
B-
9
10
A+
B+
6
8
SLO1+
SL01-
SLO2+
SLO2-
C609
1.65V
C604
R632
C605
1.65V
1.65V
R631
2
13