Focus/Tracking/Sled Servo Circuit - LG RH178H Service Manual

DESCRIPTION OF CIRCUIT

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
LIC301 BD7956FS
Logic
37 38
A+ A- B-
M
Stepping Motor
A,B,C,D
A,B,C,D
E,F,G,H
IC121 AN22113A
51 52
F- F+
FDRV
5
4
TDRV
29
30
STEP2
40 39
STEP1
B+
Focus Error
Detector
Focus Error
Detector
LIC201
Servo Control
MN103SA6G
60 D
A
64
C
66
A/D
67
4-35
FE
TE
A/D
TE FE
PARALLEL
DIGITAL
COMPENSATOR
SLED
COMPENSATOR
SDRV