Sony DVP-M35 Operation Manual page 33

The FE signal input to IC506 (DSP CXD8730R) is low frequency boosted and gain-adjusted at
the internal digital filter, and then output from the DSP as the focus drive signal (F OUT @P)
by the D/A converter inside the DSP.
The FOUT signal is input to the focus actuator (coil) drive IC (IC363:BA5981).
In IC363, voltage amplification, voltage conversion, and
current amplification are carried out to drive the focus actuator (coil) using the output signals
of IC363 (DVD FCS+, DVD FCS-).
(2) DVD
tracking servo
TK-47 board
The tracking error signal output from optical pickup is entered to the ICO06: SSI33P3720
A2 to D2 (0 to @P) on the TK-47 board. The tracking error signal is detected in the
DPD (Differential Phase Detection) method.
The amplification degree and offset value of tracking error signal are set by internal
register in the ICO06.
The tracking error signal TE (ICO06, @P) is output from ICO06, then it is entered to the
switch IC (ICOll: MC14053).
The switch IC shuts off tracking error signal when DVD RF signal (RFP) is below
about 200mVp-p (AC component).
Tracking Error (TE) signal (DPD signal: Differential Phase Detection signal) generated
in the ICOO is entered to the MB-78 board through a flexible flat cable.
TE (Tracking Error) signal passes through the switch IC, IC452 (MC 14053 that switches
CD tracking error and DVD tracking error (DPD) signal), and it is amplified at IC503
MB-78 board
NJM3403
Figure. 3-6 DVD Tracking servo, drive