Focus/Tracking/Sled Servo Circuit - LG GWA-4161B Service Manual

2. Focus/Tracking/Sled Servo Circuit

2-1. Focus, Tracking & Sled Servo Process
Focus, Tracking, Sled Servo
Pick-up
E
A,B,C,D
F
E,F,G,H
B A
C D
G
H
Tracking Focusing
Actuator
53 54
T- T+
LEVEL SHIFT
LEVEL SHIFT
IC301 BD7954FS
Logic
40 39
A+ A- B-
M
Stepping Motor
A,B,C,D
A,B,C,D
E,F,G,H
52 51
F- F+
5
4
TDRV
30
29
38 37
B+
Focus Error
Detector
Focus Error
Detector
IC121 A N22112A
IC201
Servo Control
MN103S86G
FDRV
62 D
A
66
C
STEP2
68
A/D
69
STEP1
FE
TE
A/D
TE FE
PARALLEL
DIGITAL
COMPENSATOR
SLED
COMPENSATOR
SDRV
41