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 dri$¤P)ve signal (F OUT
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 boardMB-78 board
IC006IC011IC452IC503(2/4)IC506IC363
CN001SSI33P3720MC14053MC14053NJM3403CXD8730BA5981
CN005CN452
141SWITCHDVD/CDDSPTracking
SELECTDrive
132LPFOFFSET 38 TE 3420 DPD81TOUTDVDTRK+
E
156724492318
63Q52To tracking actuator
DVDTRK�
17
184
910
From IC004 7CD/DVD
OFF when the RFP DVDCD: H: L
(CN001 8) is below 200 mVp-p
Figure. 3-6 DVD Tracking servo, drive
The tracking error signal output from optical pickup is entered to the IC006: SSI33P3720
A2 to D2 (1 to 4P) 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 IC006.
The tracking error signal #YTE (IC006, P) is output from IC006, then it is entered to the
switch IC (IC011: 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 IC006 is entered to the MB-78 board through a flexible flat cable.
TE (Tracking Error) signal passes through the switch IC, IC452 (MC14053 that switches
CD tracking error and DVD tracking error (DPD) signal), and it is amplified at IC503
(NJM3403), then entered to the @cP) of IC506 (DSP: CXD8730R).TE (
� 38 � |
ACEC
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