Focus/Tracking/Sled Servo Circuit - LG DRD-820B Manual

3. Focus/Tracking/Sled Servo Circuit

3-1. FOCUS, TRACKING & SLED SERVO PROCESS
FOCUS & TRACKING SERVO PROCESS
Pick - Up
E
A
C
B
5
F
A D
C
B
4
FOCUS &
TRACKING
ACTUATOR
T+ T- F+
LEVEL SHIFT
SLED(Feed) SERVO PROCESS
SLED MOTOR
M
Hall Sensor
VH1+
VH1-
VH2+
VH2-
CD (A. B. C. E. F)
DVD (A. B. C. D)
(A+C)-(B+D)
A.B.C.D
F-
IC604
IC605
DRIVE
OP AMP
BA6792-Y
NJM2100S
IC603
DRIVE
BA6792-Y
SL+
SL-
SLED FEED BACK BLOCK
IC606
OP AMP
NJM3403A
IC201
RF AMP
TA1254F
B-A
FOCUS
ERROR
DETECTOR
E-F
Generating
3B TE
Generating
DPD TE
IC301
CD/DVD SERVO & DSP
TC9461F
SLED
Control
Signal
FOO
TRO
IC608
OP AMP
NJM3403A
FEO
3B TE/
DPD TE
SELECTOR
TEO
TE FE
A/D
DIGITAL
EQUALIZER
D/A
(AUTO ADJUSTMENT
CIRCUIT)
FMO
IC605
OP AMP
NJM2100S
DA0
IC501
u-COM
+
+
15