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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
2. FOCUS/TRACKING/SLED SERVO CIRCUIT
2-1. Focus, Tracking & Sled Servo Process
F
E
D
C
A
B
H
G
Pick-up
Track Error
Detector
Focus Error
Detector
MPX
Block
A,B,C,D
A,B,C,D E,F,G,H
A,B,C,D
E,F,G,H
LIC101 AN22117A
LIC201 Servo Control
MN103SC7G
TE
FE
A/D
A/D
D
A
C
SLED
COMPENSATOR
A/D
TE
FE
PARALLEL
DIGITAL
COMPENSATOR
SDRV
76
75
STEP2
STEP1
LIC301 BD7776ARFS
25
26
M
Stepping Motor
Logic
A+
30
29
31
32
A-
B-
B+
Tracking Focusing
Actuator
T-
T+
F-
F+
6
5
LEVEL SHIFT
FDRV
TDRV
10
9
8
7
69
73
LEVEL SHIFT
Focus, Tracking, Sled Servo