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Toshiba 20AF42 User Manual

Toshiba 20AF42
39 pages
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SERVICE MANUAL
COLOR TELEVISION
FILE NO. 050-200201
20AF42
DOCUMENT CREATED IN JAPAN, Mar., 2002
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Toshiba 20AF42 Specifications

General IconGeneral
BrandToshiba
Model20AF42
CategoryTV
LanguageEnglish

Summary

Servicing Notices on Checking

Avoid an Electric Shock

Warning about high voltage parts and avoiding electric shock.

Use the Designated Parts

Emphasizes using specific, safety-rated parts for replacements.

Avoid an X-ray

Advises on maintaining high voltage peripheral circuits to prevent X-ray emission.

Perform a Safety Check After Servicing

Guidance on post-service safety checks, including insulation testing.

Disassembly Instructions

Removal of Anode Cap

Step-by-step guide for safely removing the anode cap, including discharge procedures.

Removal and Installation of Flat Package IC

Detailed procedure for removing and installing flat package ICs using desoldering machines.

Service Mode List

When Replacing EEPROM (Memory) IC

Guide for replacing the EEPROM IC, including data setting procedures.

Electrical Adjustments

Before Making Electrical Adjustments

Precautions and necessary tools before performing electrical adjustments.

Constant Voltage

Procedure to adjust the constant voltage to 116 ± 1V.

RF AGC

Steps for adjusting RF AGC to 2.2 ± 0.05V.

Cut Off

Procedure for adjusting the cutoff point to obtain a dim raster.

White Balance

Adjusting white balance settings for R.BIAS, G.BIAS, B.BIAS, etc.

Horizontal Position

Adjusting horizontal position to minimize overscan on the screen.

Vertical Position

Adjusting vertical position to fit the horizontal line to the shadow mask notch.

Purity and Convergence Adjustments

Electrical Adjustment Parts Location Guide (Wiring Connection)

Block Diagram

Electrical Replacement Parts List

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