— 2 —
1
— Color tuner: TU200 TEPU5-02
Selects a desired radio wave and changes it to the video IF signal.
2
— Video IF amp.: Q200 2SC4238
Amplifies the video IF signal output from tuner TU200 by 10 times (20 dB).
3
— Video det./Sound det./FM det./AFT/AGC: IC200 M51348FP
Eliminates the carrier wave in the video IF signal, and picks up the video signal and the sound IF signal.
Also, the sound signal is picked up from the sound IF signal by FM detection.
4
— Audio amp.: IC600 NJM2070M
Sound amplification.
5
— Chroma circuit: IC300 M52042FP
Generates the tricolor (red, green, and blue) from the video signal.
6
— Osc./A-D converter/display control/auto-tuning control: IC700 MSM6625-02 GSK-640F
Converts the color signal into a digital signal.
Also, generates the clock pulse for the display and controls the display.
7
— Tuning voltage generator: IC500 MSC1169MS-K
Generates the tuning voltage with the tuning pulse output from
6
.
8
— Display voltage generator: Q800~Q803, Q805, Q806, 2SD601A-R x 4, 2SB709A-R, 2SD1149-S
Generates the display voltages V0 ~ V4 with VEE1 and VCC7 outputs from the power supply.
BLOCK DIAGRAM
Antenna
1
TU200
2
Q200
3
IC200
7
Tuning
Voltage
Generator
VR600
Volume
Control
4
IC600
Speaker
IC300
IC700
Common
Driver
LCD
Segment
Driver
Chroma
Circuit
Osc.
Display
Control
A-D Converter
Auto-Tuning
Control
5
6
8
Q800~Q803, Q805, Q806
VR800
Display
Voltage
Generator
Brightness
Control
VCC2 (3.95
±
0.02 V)
VCC7 (34.2 ~ 41.8 V)
VEE1 (–6.1 ~ –7.3 V)
IC500
Power
Supply
Audio
Amp.
IF Amp.
Tuner
Video
Sound
Det.
FM
AFT Circuit
AGC Circuit
Det
