Casio tv770cdg schematic

(without price)

TV-770C (PAL B / G, H)

TV-770D (PAL I) TV-770G (PAL M)

TV-770N (PAL B / G, H)

(KX-503)

AUG. 1996

CH
CH	2	4
	14		5
		30		6
					7
				40
					50	11
							13
						60
							69

R

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CONTENTS

SPECIFICATIONS .........................................................................................	1
BLOCK DIAGRAM .........................................................................................	2
PRINTED CIRCUIT BOARDS ........................................................................	3
EXPLODED VIEW ..........................................................................................	5
PARTS LIST ...................................................................................................	6
IC AND TRANSISTOR LEAD IDENTIFICATION ..........................................	9
SCHEMATIC DIAGRAMS ............................................................................	11
WAVEFORMS ..............................................................................................	15

SPECIFICATIONS

		Item							Specification
1.	Power voltage					DC 6.0 V
2.	Power consumption					Approx. 3.6 W
3.	Current consumption					Approx. 600 mA
4.	Battery life (with alkaline batteries)					Approx. 4.0 hours
						Batteries		: 4 × LR6 (D) size batteries
5.	Power supply					Car adaptor : CA-K65
						AC adaptor		: AD-K64, 65
						Earphone jack				: 3.5 ø mini
6.	Connection terminals					External power jack				: 6.0 V DC IN
						External antenna jack				: 3.5 ø mini
7.	Screen size					2.3 inches
8.	No. of picture element					39,600 (110 × 360) dots
9.	Dimensions					127 mm (H) × 81 mm (W) × 35 mm (D)
10.	Weight					200 g without batteries
						AC adaptor				: AD-K64, 65
11.	Options					Car adaptor				: CA-K65
						Antenna matching device : AS-35S
Model			Color System		TV System					Channel
TV-770C/N			PAL			B/G, H		CCIR		VHF: 2 ~ 12 ch	UHF: 21 ~ 69 ch
TV-770D			PAL			–/I		UK		—	UHF: 21 ~ 68 ch
TV-770G			PAL			M/M		US		VHF: 2 ~ 13 ch	UHF: 14 ~ 69 ch

— 1 —

BLOCK DIAGRAM

Antenna

1 TU200

2 Q200

3 IC200

4 IC600

Speaker

Video

VR600

Sound

Det.

Audio

Tuner

IF Amp.

FM

Amp.

AFT Circuit

Volume

AGC Circuit

Control

7

IC500

5

IC300

Tuning

Voltage

Chroma

Common

LCD

Generator

Circuit

Driver

6

IC700

Osc.

Display

Segment

Control

A-D Converter

Driver

Auto-Tuning

Control

VR800

8 Q800~Q803, Q805, Q806

Power

VCC2 (3.95 ± 0.02 V)

Display

Voltage

VCC7 (34.2 ~ 41.8 V)

Supply

Generator

VEE1 (–6.1 ~ –7.3 V)

Brightness

Control

1 —

Color tuner: TU200 TEPU5-02/TEPE5-01/TEPB5-05

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 M52045FP

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.

—2 —

TOP VIEWS

Linear

Back Light

PRINTED CIRCUIT BOARDS

JK200

C603

JK600

L103

C309

H300

C305

C208C202C606

VR301

R335

R305

C351

VR300

R310

R336

C330

R226

C210

R306

C346

R322

F211

F203

L202

C270

C742

C741

C740

C340

C207

C249

F210

T200

F221

TU200

R252

R251

VR200

R255

R256

R253

T201

F220

R222

R236 C281

F200

R224

C263 C262

C259 R254

R261

R209

C245 R257

SW100

R223

R212

C780

R816

R813

C205

L102

C808

C806

R704

C236

CN710

R808

R809

R810

R820

CN700

D805

C100

VR100

R110

C800

R745

D803

R108

C782

Q110 Q101 C140

C110

C700

R113

R115

D150

VR600

C105

C115

C750

R840

T100

R830

D155

FU100

IC700

JK100

D180

C112

L101

VR700

VR800

C113

R738

D707

CN950

L950

C925

T950

C927

— 3 —