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