casio-tv-350c.pdf

(with price)

POCKET TELEVISION

TV-350C

OCTOBER 1994

Page

Specifications............................................................................................. 2

Block Diagram ........................................................................................... 3

Adjustment

Linear PCB ......................................................................................... 4

Printed Circuit Boards ................................................................................ 8

Wiring Diagram ........................................................................................ 10

Electrical Parts List .................................................................................. 11

Mechanical Parts List............................................................................... 17

Exploded Views / Disassembly ................................................................ 18

Schematic Diagrams and Waveforms ..................................................... 19

SPECIFICATIONS

Item

Specification

Reception Channels

VHF: Ch 2 ~ 12 ch UHF: Ch 21 ~ 69

Power Voltage

DC 6.0 V

Power Consumption

Approx. 3.0 W

Current Consumption

Approx. 500 mA

Battery Life (with alkaline batteries)

Approx. 3.0 hours

Batteries

: 4 AA size batteries

Power Supply

Car adaptor : CA-K65

AC adaptor : AD-K65

Connection Terminals

Earphone jack

: 3.5ø mini

External power jack : 6.0 V DC IN

Screen Size

1.6 inches

No. of Picture Element

39,600 (110

360) dots

Dimensions

122 mm (H)

66 mm (ø)

Weight

210 g excluding batteries

7.4 oz excluding batteries

Options

AC adaptor :

AD-K65

Car adaptor :

CA-K65

— 2 —

BLOCK DIAGRAM

Antenna

3 IC200

1 TU200

2 Q200

4 IC600

Speaker

Video

Sound Det.

AFT Circuit

AGC Circuit

VR600

Tuner

IF Amp.

Au d io

Amp.

Volume

Control

Tuning

Voltage

Generator

IC300

Chroma

Circuit

Common

Driver

LCD

IC700

OSC

Display

Control

A-D Converter

Auto-Tuning

Control

Segment

Driver

VR800

8 Q800 ~ Q806

Po w er

Supply

VCC2 (3.95V±0.02V)

VCC6 (30.5 ~ 39.0V)

VCC7 (53.5 ~ 72.5V)

VEE1 (-6.3 ~ -7.9V)

Brightness

Control

Display

Voltage

Generator

1 — Color Tuner: TU200 TEPE5-01

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 the tuner TU by 10 times (20dB).

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 MSM662502 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 (TU) output from 6 .

8 — Display Voltage Generator: Q800 ~ Q806 2SB1218A-R, 2SD1824R, S

2, 2SD1819A-R

2SD1824-5

Generates the display voltages V0 ~ V4 with VEE1 and VCC7 outputs from the power supply.

— 3 —

IC500

ADJUSTMENT

Linear PCB

1) Items to Be Adjusted

Item

Measuring Instrument

VCC2 voltage setting

Voltmeter

Video detection coil adjustment

TV signal generator, Pattern generator, Oscilloscope,

Low-pass filter

AFT coil adjustment

Sweep generator, Oscilloscope, Voltmeter

Contrast adjustment

TV signal generator, Pattern generator, Oscilloscope

AGC adjustment

TV signal generator, Pattern generator, IF levelmeter

Clock adjustment

Voltmeter

2) Adjustment and Test Point Locations

TOP VIEW

T 2 0 1 T200

VR100

— 4 —

BOTTOM VIEW

TP7

VR200

TP2

Pad IF

TP3

TP4

VR700

TP6

VR301

TP5

VR300

3) Equipment Connection / Procedure

VCC2 Voltage Setting

TV-350

Set

Voltmeter

Output

TP1

Input

Adjust

Output

Result

Connection Point

Signal

Connection Point

VR100

Voltmeter

TP1

0.02V

reading on voltmeter.

— 5 —

Adjust for 3.95

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