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Toshiba 21N21B2 User Manual

Toshiba 21N21B2
39 pages
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SERVICE MANUAL
PRINTED IN UK. 2002 C
COLOUR TELEVISION
21N21B2
TOSHIBA
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Toshiba 21N21B2 Specifications

General IconGeneral
BrandToshiba
Model21N21B2
CategoryTV
LanguageEnglish

Summary

Servicing Notices and Safety Precautions

Keep Notices on Chassis

Safety notices indicated with labels or seals on the chassis.

Avoid Electric Shock

Warning about high voltage parts inside the equipment.

Use Designated Parts

Use specific parts with correct characteristics for safety.

Cathode-Ray Tube Care

Caution regarding potential implosion hazard from CRT.

Avoid X-Ray Emission

Safety measures to prevent X-ray emission from high voltage circuits.

Post-Service Safety Check

Importance of post-service safety checks, including insulation testing.

Disassembly Instructions

Anode Cap Removal Procedure

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

Anode Cap Installation Procedure

Procedures for safely installing the anode cap.

Flat Package IC Removal & Installation

Procedures for removing and installing flat package ICs.

Service Mode List

Service Mode Operations

List of service modes accessible via set keys and remote control.

Replacing EEPROM (Memory) IC

Steps for replacing the memory IC and setting initial data.

Electrical Adjustments

Adjustment Procedure Overview

Steps to perform adjustments when repairing circuits or replacing parts.

Constant Voltage Adjustment

Adjusting DC voltage to 117 ± 0.5V.

VCO Adjustment

Adjusting coarse and fine VCO settings.

AGC Voltage Adjustment

Adjusting AGC voltage to 2.4 ± 0.05V.

Cut Off Adjustment

Adjusting screen volume for a dim raster.

Purity and Convergence Adjustments

Static Convergence (Rough Adjustment)

Initial rough adjustment of convergence using magnets.

Purity Adjustment Procedure

Centering and equalizing colors using purity magnets.

Static Convergence Fine Tuning

Fine-tuning convergence using 4 and 6 pole magnets.

Dynamic Convergence Adjustment

Adjusting convergence by moving the deflection yoke.

Block Diagram

Micon/Tuner Schematic Diagram (Main PCB)

MICON/Tuner Circuit Schematic

Schematic of the Microcomputer IC, tuner, and related components.

IF/Chroma Schematic Diagram (Main PCB)

IF/CHROMA IC Schematic

Schematic of the IF/Chroma IC and its supporting components.

21PIN/AV SW Schematic Diagram (Main PCB)

Sound Amp Schematic Diagram (Main PCB)

Sound Amplifier IC Schematic

Schematic of the Sound Amplifier IC and its supporting components.

Deflection/CRT Schematic Diagram (Main PCB)

V-DRIVE IC Schematic

Schematic of the Vertical Drive IC and its supporting components.

Horizontal Output & Drive Schematics

Schematic for horizontal output transistors and drive stages.

CRT Connection & Bias Schematics

Schematic showing connections to the CRT and bias circuits.

Power Schematic Diagram (Main PCB)

Power Supply Control IC Schematic

Schematic of the power supply control IC and feedback loop.

Switching Transistor Schematic

Schematic of the switching transistor and its driving components.

Voltage Regulator IC Schematics

Schematic of voltage regulators for stable power output.

Waveforms

Electrical Replacement Parts List

Resistor Parts List

List of resistors with their location, part number, and value.

Resistor Parts List (Continued)

Further continuation of the resistor list with part details.

Capacitor Parts List

List of capacitors with their location, part number, and value.

Capacitor Parts List (Continued)

Further continuation of the capacitor list with part details.

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