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Toshiba 21S23D User Manual

Toshiba 21S23D
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SERVICE MANUAL
PRINTED IN UK. 2003 C
COLOUR TELEVISION
21S23D
TOSHIBA
FILE NO: 050-200245
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Toshiba 21S23D Specifications

General IconGeneral
BrandToshiba
Model21S23D
CategoryTV
LanguageEnglish

Summary

Servicing Notices and Parts Ordering

Servicing Notices on Checking

Safety and operational notices for service technicians.

Keep the Notices

Noticing special attention points indicated by labels or seals.

Avoid Electric Shock

Warning against electric shock from high voltage parts.

Use Designated Parts

Importance of using parts with specific safety characters.

Safety Checks After Servicing

Performing safety checks after repairs are completed.

How to Order Parts

Information required for ordering replacement parts.

Important Handling Notes

Notes on handling silicon grease for ICs and transistors.

General Specifications

TV System Specifications

Details on CRT, color system, speaker, and sound output.

Tuning System Specifications

Information on broadcasting system, tuner, and frequency coverage.

Power and Regulation

Power source, consumption, and protective measures.

Disassembly Instructions

Removal of Anode Cap

Procedure for safely removing the anode cap.

Service Mode List

Confirmation of Hours Used

Procedure to check the total operating hours of the TV.

When Replacing EEPROM (MEMORY) IC

EEPROM Data Input Procedure

Steps for entering correct data into a new EEPROM IC.

Electrical Adjustments

Adjustment Procedure Overview

General steps and tools required for electrical adjustments.

Basic Adjustments

Core electrical calibration steps like voltage and VCO.

Picture Adjustments

Adjusting focus, position, size, brightness, contrast, color, and tint.

Purity and Convergence Adjustments

Static Convergence (Rough Adjustment)

Initial alignment of magnets for deflection yoke.

Purity Adjustment

Centering colors using purity magnets.

Static Convergence

Fine-tuning convergence using pole magnets.

Dynamic Convergence

Adjusting convergence for screen variations.

Electrical Adjustment Parts Location Guide

Wiring Connection Diagram

Guide showing wiring connections for adjustment points.

Block Diagram

TV System Block Overview

High-level functional blocks of the television system.

Printed Circuit Boards

Main/CRT (Inserted Parts) Solder Side

Component layout for the main and CRT boards (inserted parts).

Printed Circuit Boards - Stereo Sections

Stereo (Inserted Parts) Solder Side

Component layout for the stereo board (inserted parts).

Stereo (Chip Mounted Parts) Solder Side

Component layout for the stereo board (chip mounted parts).

MICON/TUNER Schematic Diagram

Main PCB Schematic

Circuit diagram for the micon/tuner section on the main PCB.

IF/CHROMA Schematic Diagram

Main PCB Schematic

Circuit diagram for the IF/Chroma section on the main PCB.

21PIN Schematic Diagram

Main PCB Schematic

Circuit diagram for the 21-pin connector section on the main PCB.

DEFLECTION/CRT Schematic Diagram

Main PCB Schematic

Circuit diagram for the deflection and CRT section on the main PCB.

POWER Schematic Diagram

Main PCB Schematic

Circuit diagram for the power supply section on the main PCB.

SOUND AMP Schematic Diagram

Main PCB Schematic

Circuit diagram for the sound amplifier section on the main PCB.

STEREO Schematic Diagram

Stereo PCB Schematic

Circuit diagram for the stereo processing board.

Waveforms

MICON/TUNER Waveforms

Oscilloscope readings for the micon/tuner section.

IF/CHROMA Waveforms

Oscilloscope readings for the IF/Chroma section.

Waveforms - Deflection/CRT and 21PIN

DEFLECTION/CRT Waveforms

Oscilloscope readings for deflection and CRT sections.

21PIN Waveforms

Oscilloscope readings for the 21-pin connector signals.

Waveforms - Stereo and Sound Amp

STEREO Waveforms

Oscilloscope readings for the stereo audio processing.

SOUND AMP Waveforms

Oscilloscope readings for the sound amplifier section.

Mechanical Exploded View

TV Assembly Diagram

Visual representation of how the TV components fit together.

Mechanical Replacement Parts List

Cabinet and External Parts

List of chassis, buttons, and external components.

Screws and Small Hardware

List of various screws and fasteners used in assembly.

Electrical Replacement Parts List

Resistors

List of resistors with their values and types.

Capacitors

List of capacitors with their values and types.

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