LG GSA-4167B - Manual (Page 46)

50
3. Tracking & Sled Circuit
3-1-1. Block Diagram (Tracking Following)
Disc
Motor unit Optical
Pick-up
HOP-7632TS
A,B,C,D
(EF1~EF4)
TE
TE
R101
C101
GND
TE
ADC
Tracking
Compensator
DAC
TRD
TACT+ TACT-
IC101
R2S35002
IC301
R8J32007
MPPO
(A+D)-(B+C)
G
HAVC
LS
to
V14
1
173 181
L
P
F L
P
F SPPO
(A+D)-(B+C)-K[(EF1+EF4)-(EF2+EF3)]
Sled
Compensator
DAC
SL2
183
SL1
182
A+
A-
B+
B-
SLED MOTOR
Unit
(CN601)
TRD
R330
IC601
R2S30202FP
TACT+
TACT-
EN1
EN2
CTL1
CTL2
REF
C604
1.65V
TOIN
39
42
20
21
36
37
SL2 2
SL1 3
SL1IN
SL2IN
A-
B-
8
10
A+
B+
6
9
SL2N
SL1N
SL2P
SL1P
C336
1.65V
C338
C337
R372
1.65V
R374
R373
R332
R331