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Toshiba 20AF45 User Manual

Toshiba 20AF45
50 pages
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SERVICE MANUAL
COLOR TELEVISION
DOCUMENT CREATED IN JAPAN, February, 2005
20AF45
20AF45C
FILE NO. 050-200504
(MFR’S VERSION A)
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Toshiba 20AF45 Specifications

General IconGeneral
Screen Size20 inches
Display TypeCRT
Resolution480i
Aspect Ratio4:3
InputsComposite

Summary

Servicing Notices on Checking

Keep the Notices

Describes labels and seals indicating special attention areas during servicing.

Avoid Electric Shock

Cautionary note regarding high voltage parts inside the equipment.

Use Designated Parts

Emphasizes using specific parts with safety characters for replacements.

Original Position for Parts and Wires

Instructions to return parts and wires to their original positions after assembly.

Cathode-Ray Tube Handling

Cautionary advice for handling the cathode-ray tube during servicing.

X-Ray Safety Precautions

Notes on avoiding X-ray emission by using designated parts.

Post-Servicing Safety Check

Procedure for performing a safety check after completing repairs.

How to Order Parts

Important Maintenance Note

About Lead Free Solder (PbF)

PbF PCB Distinction

Identifies Printed Circuit Boards (PCBs) manufactured using lead-free solder.

Lead Free Solder Handling Caution

Cautions regarding higher melting points and handling of lead-free solder.

Solder Composition Recommendations

Recommendation for lead-free solder composition.

General Specifications: TV System and Tuning

CRT, Speaker, and Broadcast System Details

Specifications for CRT, speaker, color system, and broadcast system.

Tuner and Frequency Specifications

Details on tuner system, intermediate frequency, and channel coverage.

General Specifications: Power, Regulation, and Environment

Power Source, Consumption, and Protectors

Information on power source, consumption, and protective circuits.

Safety, Radiation, Temperature, and Humidity

Safety compliance, radiation standards, and operating environment specs.

General Specifications: On-Screen Display and Clock Functions

OSD Menu Options and Language

Details on on-screen display menu types, options, and language settings.

Clock and Timer Settings

Specifications for sleep timer, on/off timer, and wake-up timer functions.

General Specifications: Remote Control

Remote Control Unit Features

Details on the remote control unit, including keys and functions.

General Specifications: Unit Features and Accessories

Product Features List

List of various features supported by the television unit.

Included Accessories List

List of accessories provided with the television.

General Specifications: Interface and Physical Data

Input/Output Interfaces and Connectors

Details on front and rear input/output interfaces and terminals.

Physical Dimensions, Weight, and Packaging

Specifications for unit dimensions, weight, carton, and drop test.

Cabinet Material and Environmental Specifications

Information on cabinet material and environmental requirements.

Disassembly Instructions

Anode Cap Removal Procedure

Step-by-step guide for safely removing the anode cap.

Flat Package IC Removal and Installation

Procedure for removing and installing flat package integrated circuits.

Service Mode List

Confirming Power On Hours

Instructions on how to check the total power on hours of the unit.

EEPROM (Memory) IC Replacement

Procedure for replacing the EEPROM IC and setting data.

Electrical Adjustments: Overview and Basic Settings

Adjustment Procedure and Tools

Overview of electrical adjustments and required measurement tools.

Basic Adjustments: Voltage, Cut Off, White Balance

Procedures for constant voltage, cut off, and white balance adjustments.

Focus Adjustment

Procedure for adjusting the picture focus.

Electrical Adjustments: Picture and Timing Settings

Vertical Position and Size Adjustment

Adjusting vertical position, size, and over scan.

Vertical Linearity and Level Adjustment

Adjusting vertical linearity and signal level.

Horizontal Phase and Contrast Max Settings

Adjusting horizontal phase and maximum contrast.

Separation Adjustments

Procedures for adjusting audio separation (SEP 1 and SEP 2).

Electrical Adjustments: Display and Color Settings

OSD Position Adjustment

Adjusting the position of the on-screen display elements.

Brightness and Color Center Adjustment

Adjusting brightness center and color center for picture quality.

Tint Adjustment

Procedure for adjusting the picture tint for accurate color.

Electrical Adjustments: Fixed Value Confirmation

Verifying Adjustment Item Values

Checking fixed values for various adjustment items (RF, AV, CS).

Purity and Convergence Adjustments

Static Convergence (Rough) and Purity

Initial steps for static convergence and purity adjustments.

Static and Dynamic Convergence Fine Tuning

Fine-tuning static and dynamic convergence for precise picture alignment.

Electrical Adjustment Parts Location Guide

Wiring Connections for Adjustments

Guide illustrating wiring connections for electrical adjustments.

Block Diagram

Main PCB Signal Flow

Diagram showing signal paths and connections on the Main PCB.

Printed Circuit Boards: Main/CRT

Component Layout - Solder Side

Visual guide to component placement on the Main/CRT PCB solder side.

Printed Circuit Boards: Main/CRT

Component Layout - Chip Parts

Visual guide to chip component placement on the Main/CRT PCB.

Schematic Diagrams: Micon

Micon IC and Associated Circuitry

Schematic diagram for the Micon Integrated Circuit and its connections.

Schematic Diagrams: Chroma

Chroma IC and Associated Circuitry

Schematic diagram for the Chroma Integrated Circuit and its connections.

Schematic Diagrams: Deflection

Deflection IC and Associated Circuitry

Schematic diagram for the Deflection Integrated Circuit and its connections.

Schematic Diagrams: Power

Power Supply Circuitry

Schematic diagram of the power supply circuit.

Schematic Diagrams: Sound

Sound ICs and Associated Circuitry

Schematic diagram for the Sound ICs and associated circuitry.

Schematic Diagrams: Tuner/Stereo

Tuner and Stereo ICs and Circuitry

Schematic diagram for the Tuner/Stereo ICs and associated circuitry.

Schematic Diagrams: Comb/Filter/AV

Comb Filter IC and Associated Circuitry

Schematic diagram for the Comb Filter IC and associated circuitry.

Schematic Diagrams: CRT

CRT PCB Components and Circuitry

Schematic diagram for the CRT PCB, showing components and connections.

Waveforms: Micon and Chroma

Micon Signal Waveforms

Illustrations of typical waveforms measured at Micon points.

Chroma Signal Waveforms

Illustrations of typical waveforms measured at Chroma points.

Waveforms: Deflection, Sound, and Video

Deflection, Sound, and Comb/Filter/AV Waveforms

Illustrations of waveforms for Deflection, Sound, and Comb/Filter/AV signals.

CRT Signal Waveforms

Illustrations of typical waveforms measured at CRT signal points.

Mechanical Exploded View

Chassis Assembly Exploded Diagram

Exploded view showing the assembly of the television chassis.

Mechanical Exploded View: Packing Diagram

Packaging Components Exploded Diagram

Exploded view illustrating the packaging components.

Mechanical Replacement Parts List

Cabinet and Structural Parts

List of replacement parts for the cabinet and structural components.

Hardware, Holders, and Felt Sheets

List of replacement hardware, holders, and felt sheets.

Mechanical Replacement Parts List

Packaging, Labels, and Instruction Materials

List of replacement parts for packaging, labels, and instructions.

Various Hardware Components

List of various screws and other hardware replacement parts.

Electrical Replacement Parts List: Resistors, Capacitors, and Diodes

Resistors List

List of replacement resistors with their values and specifications.

Capacitors List

List of replacement capacitors with their values and specifications.

Diodes List

List of replacement diodes with their types and specifications.

Electrical Replacement Parts List: ICs and Transistors

ICs List

List of replacement Integrated Circuits (ICs) and their specifications.

Transistors List

List of replacement transistors and their specifications.

Electrical Replacement Parts List: Coils, Transformers, and Jacks

Coils, Transformers, and Jacks List

List of replacement coils, transformers, and audio/video jacks.

Switches, Variable Resistors, and PC Boards

List of replacement switches, variable resistors, and PC boards.

Miscellaneous Components List

List of miscellaneous replacement parts like fuses, batteries, and speakers.

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