Digital Servo System - Panasonic RX-DT30 Service Manual

n Digital Servo System

DIGITAL SERVO SYSTEM

This servo system has no adjustment VRs.
m
A
B
The following flow chart shows the sequence of automatic adjustments.
9 Flow chart on automatic adjustment sequence
Approx. 2 sec.
No
MN66271 RA (Super 1 chip IC)
(Digital servo processor)
_----- - - - - -
-4
I
Focus error
output signal
t
Focus offset adjustment
+
Tracking offset adjustment
t
Temporary adjustment of focus gain
c
Spindle motor starts rotation
L-J
Yes
I
7
1
soft
I
;
microprogram
processing
/I
Microcomputer
Because the microcomputer precisely performs the
l
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
Tracking balance adjustment
No
Fine adjustment of focus gain
Fine adjustment of tracking gain
j R X - D T 3 0
J-
Digital audio
playback + t
dl
F coil Lens
OCUS
_QO
Tracking coil
Traverse coil
i