Panasonic RX-DT30 - Digital Servo System

j
RX-DT30
n Digital Servo System
DIGITAL SERVO SYSTEM
This servo system has no adjustment VRs.
MN66271 RA (Super 1 chip IC)
(Digital servo processor)
_-----
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Digital audio
dl
J-
I
7 playback + t
1
m
A B
Focus error
output signal
-4
I
FOCUS coil Lens
_QO
Tracking coil
soft
I
microprogram ;
processing
/I
Traverse coil
Microcomputer
The following flow chart shows the sequence of automatic adjustments.
9 Flow chart on automatic adjustment sequence
t
Focus offset adjustment
+
Tracking offset adjustment
t
Temporary adjustment of focus gain
Approx. 2 sec.
c
Spindle motor starts rotation
l Because the microcomputer precisely performs the
automaticadjustmentsasshownin theflowchart, itwill
take approx. 5 seconds to finish reading TOC data if a
used disc is ecentric or the surface is warped.
Temporary adjustment of tracking gain
i
Tracking balance adjustment
No
No
Yes
L-J
Fine adjustment of focus gain
Fine adjustment of tracking gain