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Toshiba 20AF46C User Manual

Toshiba 20AF46C
50 pages
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SERVICE MANUAL
COLOR TELEVISION
DOCUMENT CREATED IN JAPAN, January, 2006 GREEN
20AF46
20AF46C
(MFR’S VERSION B)
FILE NO. 050-200601GR
The above model is classified as a green product (*1), as indicated by the underlined serial number.
This Service Manual describes replacement parts for the green product. When repairing this green
product, use the part(s) described in this manual and lead-free solder (*2).
For (*1) and (*2), see the next page.
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Toshiba 20AF46C Specifications

General IconGeneral
Screen Size20 inches
Resolution480i
Aspect Ratio4:3
Display TechnologyCRT
InputsComposite, S-Video, RF
Speakers2
Resolution TypeStandard Definition

Summary

Servicing Notices and Procedures

Servicing Notices on Checking

Safety and procedural guidelines for checking and servicing the television.

How to Order Parts

Information required for ordering replacement parts, including model and part numbers.

Important Service Notes

Key considerations and warnings for service operations, such as heat sink grease application.

General Specifications

TV System and CRT Specifications

Details on the television system, color system, and Cathode Ray Tube (CRT) characteristics.

Tuning and Sound System Details

Specifications for the tuning system, intermediate frequency, and sound output capabilities.

Power, Regulation, and Environment

Power source, safety regulations, operating temperature, and humidity requirements.

On-Screen Display and Menu Features

Capabilities and options available through the on-screen display menu for picture and sound.

Remote Control and Features

Specifications for the remote control unit and various product features like sleep timer.

Interface and Accessories

Connection ports, physical dimensions, weight, and included accessories.

Disassembly Instructions

Anode Cap Removal Procedure

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

Flat Package IC Removal and Installation

Techniques for removing and installing surface-mount integrated circuits on the PCB.

Service Mode and Electrical Adjustments

Service Mode List and Operations

Guide to accessing and utilizing the unit's service modes for repair and adjustment.

EEPROM Replacement Procedure

Steps for replacing the EEPROM (Memory IC) and ensuring correct data settings.

Electrical Adjustment Procedures

Detailed instructions for performing various electrical adjustments like white balance and focus.

Purity and Convergence Adjustments

Procedures for adjusting screen purity, static, and dynamic color convergence.

Adjustment Parts Location Guide

Guide to the location of parts and wiring connections relevant to electrical adjustments.

Diagrams and Waveforms

Block Diagram Overview

High-level functional representation of the television's internal circuitry.

Printed Circuit Board Layouts

Visual layouts of the main and CRT printed circuit boards, showing component placement.

Schematic Diagrams

Detailed circuit diagrams for various sections including Micon, Chroma, Power, and Sound.

Waveform Examples

Visual examples of signal waveforms measured at key test points within the Micon, Chroma, and Sound sections.

Mechanical Information and Parts Lists

Mechanical Exploded Views

Diagrams illustrating the assembly of mechanical components and the overall unit.

Mechanical Replacement Parts List

List of replaceable mechanical parts, including location, TSB P/N, reference number, and description.

Electrical Replacement Parts List

List of replaceable electrical components like resistors, capacitors, diodes, and ICs.

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