Signal Detection Of The P/U - LG RCT689H Service Manual

3. SIGNAL DETECTION OF THE P/U

1) Focus Error Signal ==> (A+C)-(B+D)
This signal is generated in RF IC (LIC121 : AN22113A) and controls the pick-up's up and down to focus on
Disc.
2) Tracking Error Signal (DPP Method) ==> {(A+D)-(B+C)}- k x {(EF1+EF4)-(EF2+EF3)}
This signal is generated in RF IC (LIC121 : AN22113A) and controls the pick-up's left and right shift to find
track on Disc.
3) RF Signal ==> (A+B+C+D)
This signal is converted to DATA signal in DSP IC (LIC201 : MN103SA6G).
5-27