LG CED-8042B Manual page 38

3. Structure of the Photo Diode
1) Focus Error Signal
This signal is generated in RF AMP IC (IC601 : AK8563) and controls the pick-up's up and down to focus
on CD Disc.
2) Tracking Error Signal (DPP Method)
This signal is generated in RF AMP IC (IC601 : AK8563) and controls the pick-up's left and right shift to
find the track on CD Disc.
3) RF Signal (A+B+C+D)
This signal is converted to DATA signal in DSP IC (IC501 : CXD3011R-1)
D
H G
A
(A+C)-(B+D)
Pick-Up module
Photo Diode
Pick-Up module
Photo Diode
C
F
B
{(A+D)-(B+C)}- k X {(E-F)+(G-H)}
Tracking
E
Infrared Iaser
Focusing
Tracking
Infrared Iaser
Focusing
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