Spindle Control - Sony DVP-M35 Operation Manual

3-2-3. Spindle Control

This section describes the flow of control signals in the spindle servo during DVD playback.
The CLV control signal is generated from the RF signal obtained from the optical pickup in
P) and CLV phase error (MDPO @P).
These two error signals is added by IC301 (NJM3404) and output from OP.
The spindle error output signal SPERR of the @P of IC301 is input to the spindle drive IC
The IC303 is a 3-phase brushless motor drive IC, and it contains a spindle error signal
amplifying circuit, gain switching circuit, and motor forced acceleration and deceleration
control circuit.
Gain switching is done with the SPGCl signal (@P).
Disc size (CD/DVD)
12cm
8 c m
At the start and stop of disc playing, the forced acceleration and deceleration control is
executed.
Control mode
Acceleration
Deceleration
No control
MB-78 board
A R P
c o n t r o l
4
SPGC 1 level
H
L
Input signals
SPCTRLO (@P)
H
H
L
N J M 3 4 0 4
Figure 3-l 1. DVD spindle control
L
H
H
F r o m
L G A C X D 6 7 2 6
T o s p i n d l e
m o t o r