LG HDR676X - Focus;Tracking;Sled Servo Circuit

4-35
DESCRIPTION OF CIRCUIT
2. FOCUS/TRACKING/SLED SERVO CIRCUIT
2-1. FOCUS, TRACKING & SLED SERVO PROCESS
F
E
DC
AB
H
G
Pick-up
Focus Error
Detector
Focus Error
Detector
A,B,C,D
A,B,C,D
E,F,G,H
A,B,C,D
E,F,G,H
IC121 AN22113A
FE
TE
LIC201
Servo Control
MN103SA6G
TE FE
A/D
D
A
C
SLED
COMPENSATOR
A/D
PARALLEL
DIGITAL
COMPENSATOR
SDRV
60
64
66
67
STEP2
STEP1
LIC301 BD7956FS
29
30
M
Stepping Motor
Logic
A+
37 38 40 39
A- B- B+
Tracking Focusing
Actuator
T- T+ F- F+
5
4
LEVEL SHIFT
FDRV
TDRV
LEVEL SHIFT
53 54 51 52
Focus, Tracking, Sled Servo