LG GDR-8162B Service Manual page 19

Dvd-rom drive
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3-4. LNSC (LENS CENTER SIGNAL)
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RFDiF(LENSC) signal is used as error signal for tracking servo.
This signal is used only for long seek (about 1000 track seek).
This signal make lens fixed at detector center.
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RFDiF
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LNSC Circuit

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