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