Servo Operation At Cd And Video Cd Playing; 3-3-L. Optical Pickup Control - Sony DVP-M35 Operation Manual
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Also See for DVP-M35:
- Service manual (105 pages) ,
- Operation manual (78 pages) ,
- Operating instructions manual (50 pages)
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3-3.
Servo Operation at CD and Video CD Playing
3-3-l. Optical Pickup Control
(1) CD focus servo
Figure 3-13.
The RF signal (PDI, PD2) output from the CD optical pickup is converted to the focus
error signal (CDFE, BP) in ICOO (CD RF amplifier CXA2555Q) of the TK-47 board.
The CD focus error signal (CDFE) is passed through the flexible flat cable and input to
the switch IC452 (MC14053) of the MB-78 board. During CD playback, it is passed
through the switch IC452, BUFF IC503, and input to @P FE of IC506 (DSP:CXD8730R).
The focus error signal is gain-adjusted, focus bias adjusted as done during DVD playback
in the DSP.
The focus drive signal (FOUT, @P) output from the DSP IC is input to the focus drive
IC (IC363 BA5981FP) as done during DVD playback.
IC363 is a 4ch driver IC, but performs coil driving of each pickup by switching the
level (II/L) of the MUTE terminal (a, @P) during CD and DVD playback.
Play mode
DVD
CD, Video CD
The IC363 amplifies voltage, transforms voltage, and amplifies current, then BLT drives
the focus coil of CD pickup with its output signals (CD FCS+, CD FCS-).
S waveform at CD disc (focus error), IC506@P
MUTE signal
"IT'
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