Toshiba 21SZ5E1 - User Manual

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Summary

General Adjustments

X-Ray Radiation Precautions

Details on potential X-ray hazards and protection measures for safe servicing.

Service Safety Precautions

Essential safety measures for technicians, including isolation transformer use.

Product Safety Notice

Components with special safety characteristics and replacement guidelines.

Setup Adjustments

Color Purity Adjustment

Steps to adjust color purity using yoke and magnet positioning for optimal display.

Convergence Adjustment

Procedures for aligning color beams (center and circumference) for a sharp picture.

White Balance Adjustment

Steps to ensure accurate color reproduction across brightness levels (cut-off and drive).

Service Mode Operations

Entering and Displaying Service Mode

Guide to accessing and displaying the adjustment menu in service mode.

Service Mode Key Functions

Explanation of key functions and button operations within the service mode.

Selecting and Adjusting Data

How to select adjustment items and change data values in service mode.

Memory Initialization and Test Signals

Procedures for memory initialization and selecting test patterns.

Self Diagnostic Function

How to perform and interpret self-diagnosis for troubleshooting system issues.

Design Mode Operations

Entering and Using Design Mode

Steps to access and navigate the design mode for specific adjustments.

Selecting and Adjusting Design Data

How to select adjustment items and change data values within design mode.

Electrical Adjustments

Focus VR Adjustment

Procedure to adjust focus for sharp scanning lines on the picture screen.

Sub-Brightness (BRTC) Adjustment

Steps to adjust brightness for optimal picture visibility and contrast.

Horizontal Position Adjustment (HPOS)

Procedure to set the horizontal picture position accurately.

Vertical Position Adjustment (VPOS)

Procedure to set the vertical picture position accurately.

Vertical Amplitude Adjustment (HIT)

Steps to adjust vertical picture amplitude for correct display height.

Circuit Checks

High Voltage Check

Procedure to verify high voltage levels against specified limits for safety.

Specific Information

Setting and Adjusting Data

Reference data tables for service mode and design mode adjustments.

Location of Controls

Identification of controls and parts on the TV set and remote control.

Channel Presetting and Tuning

Procedures for auto search memory, manual search, and fine tuning.

Chassis and Cabinet Replacement Parts List

Capacitors

List of replacement capacitors with location, part number, and description.

Resistors

List of replacement resistors with location, part number, and description.

Coils and Transformers

List of replacement coils and transformers with location and part details.

Semiconductor Replacement Parts

Transistors

List of replacement transistors with location, part number, and description.

Diodes

List of replacement diodes with location, part number, and description.

Integrated Circuits (ICs)

List of replacement ICs with location, part number, and description.

Accessories

Remote Control and Manuals

Replacement remote control unit and owner's manuals.

Cabinet Parts

Front and Door Parts

List of replacement front covers, doors, and knobs.

Schematic Diagram Overview

Schematic Diagram Structure

Overview of the schematic diagram structure, detailing main and CRT circuit sheets.

Terminal View of Transistors

Visual identification of transistor pinouts (base, emitter, collector).

Schematic Diagram

Schematic Diagram Notes

Explanations of symbols, conventions, and measurement notes for schematics.

Circuit Block Diagram

Functional Block Overview

Illustration of the television's main functional blocks and their interconnections.

Product Specifications

General Specifications

Details on rated voltage, power consumption, dimensions, mass, and picture tube.

Television System and RF Signal

Information on TV system coverage, channel ranges, and RF signal types.

Color System and Sound Output

Details on color systems, sound systems, and speaker specifications.

This document is a service manual for Toshiba Color Televisions, specifically models 21SZ5E1, 21SZ5ES1, and 21SZ5T1, which utilize the S3E Chassis. It provides comprehensive information for servicing, adjusting, and maintaining these television sets.

Function Description:

The Toshiba Color Television models covered by this manual are designed for displaying color television broadcasts and external video/audio inputs. They feature a flat square picture tube and support various television systems and color standards, including PAL B/G, PAL I, PAL D/K, SECAM B/G, SECAM D/K, NTSC M, NTSC4.43, and PAL 60Hz. The televisions are equipped with a tuner for aerial input, and multiple AV input terminals (front and back) for connecting external devices such as VCRs, DVD players, or gaming consoles. A monitor output is also available for video and audio. The remote control unit allows for convenient operation, including channel selection, volume control, menu navigation, and access to special functions like service and design modes.

Important Technical Specifications:

Model Numbers: 21SZ5E1, 21SZ5ES1, 21SZ5T1
Chassis: S3E
Rated Voltage: 110-240V, 50/60Hz
Power Consumption: 92W (at ~220V 50Hz)
Dimensions (Width x Depth x Height): 613(W) x 487(D) x 470(H) mm
Mass: 23.4kg
Picture Tube: Type 21 Flat square picture tube.
- Overall diagonal: 549.1mm
- Viewable diagonal: 505.5mm
- Deflection: 90°
Television System (Aerial Input) Coverage:
- 21SZ5E1/21SZ5ES1:
  - PAL B/G (CCIR): VHF 2-12, UHF 21-69, CATV X~Z+2, S1~S41
  - PAL I (UK): UHF 21-69
  - PAL D/K (CHINA): VHF 1-12, UHF 13-57, CATV Z-1~Z-38
  - SECAM B/G (CCIR): VHF 2-12, UHF 21-69, CATV X~Z+2, S1~S41
  - SECAM D/K (OIRT): VHF 1-12, UHF 21-69, CATV X1~X19
  - NTSC M (US): VHF 2-13, UHF 14-69, CATV A-6~A-1, A~W, AA~ZZ, AAA, BBB
  - NTSC M (JAPAN): VHF 1-12, UHF 13-62, CATV M-1~M-10, S1~41
- 21SZ5T1:
  - PAL B/G (CCIR): VHF 2-12, UHF 21-69, CATV X~Z+2, S1~S41
  - SECAM B/G (CCIR): VHF 2-12, UHF 21-69, CATV X~Z+2, S1~S41
Special RF Signal (Color System / Sound System):
- 21SZ5E1/21SZ5ES1:
  - NTSC4.43: 5.5/6.0/6.5 MHz
  - PAL 60Hz: 5.5/6.0/6.5 MHz
- 21SZ5T1:
  - NTSC4.43: 5.5 MHz
  - PAL 60Hz: 5.5 MHz
Color System: PAL / SECAM / NTSC4.43 / NTSC3.58
Sound Output: 2.5 W x 2
Terminals:
- Input: Video, Audio L, Audio R
- Monitor output: Video, Audio L, Audio R
Speaker: 6 x 12cm (2)
High Voltage at Zero Beam: (A) 29.7 kV (for 21" models)
Max High Voltage: (B) 32.0 kV (for 21" models)
AV Voltage: (C) 110-240 V

Usage Features:

Remote Control: The television is operated primarily via a remote control unit, which includes buttons for power, channel selection (up/down, direct select), volume control, menu access, TV/VIDEO input selection, sound mute, picture control, on-screen display (CALL), and game select. Some buttons on the remote may not be available for all TV models.
On-Screen Menu: The TV features an on-screen menu for accessing and adjusting various settings.
Channel Preset: Users can preset channels using auto search memory (ASM) or manual search. The ASM function automatically finds and stores all receivable channels. Manual search allows for individual channel tuning and assignment to specific positions.
Skip Function: Unnecessary position numbers can be skipped during channel selection.
Fine Tuning: Manual fine tuning (MFT) and auto fine tuning (AFT) functions are available to improve picture quality, especially under unstable reception conditions. AFT can be set independently for each position.
Test Signals: Built-in test signals (red, green, blue, all black, all white rasters, black & white, cross-bar, cross-hatch, cross-dot patterns, and H signal) are available in service mode for adjustments and diagnostics.

Maintenance Features:

Service Mode: This mode allows technicians to perform various adjustments and access specific information.
- Adjustment Menu: Provides access to settings like safety instructions, setup adjustment, service mode, design mode, electrical adjustments, and circuit check.
- Key Functions: Specific key combinations on the remote control and TV set enable special functions within the service mode, such as single horizontal line ON/OFF, test signal selection, item selection, data value change, memory initialization, and reset of the operating protect circuit count.
- Initialization of Memory Data (QA02): A procedure is outlined for initializing memory data after replacing the QA02 IC, followed by checking and adjusting picture settings.
Design Mode: Similar to service mode, design mode allows for adjustments of specific items, particularly "OPT0" and "OPT1," which are relevant after QA02 initialization.
Electrical Adjustments: Detailed procedures are provided for:
- FOCUS VR ADJ: Adjusting the FOCUS control for well-defined scanning lines.
- SUB-BRIGHTNESS (BRTC): Adjusting brightness correction to ensure proper display of the internal pattern and prevent vertical retrace lines from appearing.
- HORIZONTAL POSITION ADJUSTMENT (HPOS) & VERTICAL POSITION ADJUSTMENT (VPOS): Centering the picture horizontally and vertically.
- VERTICAL AMPLITUDE ADJUSTMENT (HIT): Adjusting vertical amplitude to ensure the picture fills the screen correctly.
- WHITE BALANCE ADJUSTMENT (CUTOFF & DRIVE): Adjusting red, green, and blue cutoff and drive values to achieve correct white balance in both light and dark areas of the screen.
Setup Adjustment: Procedures for mechanical adjustments when a complete realignment or new picture tube installation is required:
- Color Purity Adjustment: Demagnetizing the picture tube, setting brightness and contrast, using a green raster, and adjusting the yoke and purity magnet for a uniform green screen.
- Convergence Adjustments: Using a cross-dot pattern, adjusting 4-Pole and 6-Pole Magnets for center convergence, and tilting the deflection yoke for circumference convergence.
Circuit Check (High Voltage Check): A procedure to verify that the high voltage remains within specified limits, emphasizing that there is no high voltage adjustment on this chassis.
Self Diagnostic Function: A built-in diagnostic tool accessible via the remote control to check the proper execution of interface among ICs, displaying status for microprocessor, protection circuit, bus line, bus control, and input modes.
Replacement Parts List: A comprehensive list of chassis and cabinet replacement parts, including capacitors, resistors, coils, transformers, semiconductors, and miscellaneous components. Parts with special safety-related characteristics are identified with hazard symbols.
Safety Precautions: Warnings regarding X-ray radiation, the importance of using an isolation transformer, discharging the picture tube anode, and ensuring all protective devices are reinstalled after servicing. Emphasis is placed on using identical replacement parts for safety-related components.