Tracking & Sled Circuit - LG GSA-4167B Service Manual

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