Table of Contents
Advertisement
KDV-S210P/S220P
/S230P/S240P
Ref. No.
Application / Function
Spindle motor driver
SU3
Spindle motor rotation detection
DVD/CD servo error signal replay
SU6
amplifier control
Built-in DVD/CD laser APC circuit
Frame buffer memory
SU7
System memory
CH1-side
Servo reference voltage generation
amplifier
SU8
CH2-side
RFRP (mirror detection signal)
generation amplifier
SQ3
3.3V regulator
SQ4
Driver for LD-driving for CD
SQ5
Driver for LD-driving for DVD
THERMISTER PCB
Ref. No.
Application / Function
UT1
Inverter
UT2
Comparator
QT1
Switching TR
Temperature detection thermister for
THT1
thermal shutdown
DISPLAY PCB
Ref. No.
Application / Function
Power supply ON/OFF delay circuit
UD3
NOR gate IC
POWER & OUTPUT PCB
Ref. No.
Application / Function
VCC (+5V) generation switching
UP1
regulator IC
4
COMPONENTS DESCRIPTION
Timing is controlled by No. 18 pin control signal for the 3-phase brushless spindle motor, using
No. 1~6 pins Hall element input signals, while current outputs are made from No 20, 22 and 24 pins.
Rotation FG output for controlling spindle motor is output from No. 27 pin.
Generation of various servo signals from pick up signals.
Built-in LD current control circuit for DVD/CD.
Memory for temporarily caching read data of DVD/CD.
External microcomputer memory for F/E system control.
CH1-side
Signal after dividing VC25 (2.5V) into 2.1V enters the positive phase and output from the
output terminal as buffer output.
CH2-side
RF bottom hold signal and its DC are input to reverse input and positive input respectively
for canceling DC fluctuation. These then can be used as mirror signals.
VCC (5V) is input from No. 3 pin and 3.3V is output from No. 2 pin.
CD's LD current control signals output from SU6 are received at base and the current
amount for LD driving is controlled.
DVD's LD current control signals output from SU6 are received at base and the current
amount for LD driving is controlled.
Output from UT2 comparator is inverted. Input is made on No. 2 pin and output on No. 4
pin. Active L.
Signal from thermister is inverse input and reference voltage is input to positive-phase
input. Output from thermister is comparated and output from No. 4 pin. Active H.
UT1 output is received on the base and output is inverted when it is made. The output is
feedback into the positive-phase input at UT2 for containing the fluctuations in outputs.
Resistance value is low at low temperature and high at high temperature.
With +B_DWN of reduced voltage detection circuit and OR of /P_ON signal, /P_DWN
signal is generated.
Power supply is input from No. 2 pin and switching output is made from No. 3 pin.
Going via choke coil, it becomes VCC (+5V) power supply output.
Operation / Condition / Compatibility
Operation / Condition / Compatibility
Operation / Condition / Compatibility
Operation / Condition / Compatibility
Advertisement
Table of Contents
