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Block Diagram - Casio EV-2500B Service Manual & Parts List

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TV
Antenna
1 TU200
Tuner
7
IC270
Tuning
Voltage
Generator
VCC1 (4.5 ± 0.05 V)
VCC2 (4.5 ± 0.05 V)
Power
VCC7 (25.9 ~ 31.3 V)
Supply
VCC6 (10.0 ~ 12.0 V)
VEE1 (–8.0 ~ –7.0 V)
VEE2 (–18.4 ~ –16.0 V)
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 IR3P90Y
Generates the tricolor (red, green, and blue) from the video signal.
6 — Display control/Auto-tuning control: IC700 MSM6770GS
Controls the display.
7 — Tuning voltage generator: IC270 BA10358F
Generates the tuning voltage with the tuning pulse output from 6.

BLOCK DIAGRAM

3 IC200
2 Q200
Video
Sound
IF Amp.
FM
AFT Circuit
AGC Circuit
5
Chroma
Circuit
6
Display
Control
Auto-Tuning
Control
— 3 —
VR600
Det.
Det
Volume
Control
IC300
IC700
4 IC600
Speaker
Audio
Amp.
LCD

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