8.

TES and HFL (traverse signals)

When moving the pickup from the outer track to the inner track, the EF output from the pickup must be connected so that the

phase relationship of TES and HFL is as shown in the diagram below. For the TESI input, the TES comparator has negative

polarity and hysteresis of approximately ±100 mV. An external bandpass filter is needed in order to extract only the required

signal from the TE signal.

9.

DRF (luminous energy determination)

DRF goes high when the peak of the EFM signal (RFSM output) held by the PH1 (pin 60) capacitor exceeds approximately

2.1 V. The PH1 (pin 60) capacitor affects the DRF detection time constant and the RFAGC response bidirectional setting. The

DRF output is driven by a constant current (250 µA).

Pickup position

Focus

10. Focus determination

Focus is assumed to be obtained when the focus error signal S curve reaching REF + 0.2 V is detected, and the S curve

subsequently returns to REF.

Focus

LA9241M

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