EasyManua.ls Logo

Sharp 21LT-45SES User Manual

Sharp 21LT-45SES
56 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
Page #1 background imageLoading...
Page #1 background image
1
21LT-45S
SERVICE MANUAL
This document has been published to
be used for after sales service only.
AK- 44 CHASSIS
In the interests of user safety (required by safety
regulations in some countries) the set should be re-
stored to its original condition and only parts identi-
cal to those specified should be used.
SHARP CORPORATION
CONTENTS
ELECTRICAL SPECIFICATIONS ........................................................................................ 3
IMPORTANT SERVICING NOTES ...................................................................................... 4
CONTROLS & TERMINALS ................................................................................................ 5
PRINTED WIRING BOARD LAYOUT ................................................................................. 6
PARTS LISTING ................................................................................................................... 7
HOW TO UPDATE THE TECHNICAL INFORMATION ...................................................... 11
MODEL 21LT-45SES
SE0021LT45S00
Issued: 16
th
Feb. 2004
PAL B/G / SECAM L/L’, B/G, D/K SYSTEM COLOUR TELEVISION
In order to service the model 21LT-45S, refer to
the AK-44 Chassis Service Manual
(SE00AK44CHA00).

Table of Contents

Question and Answer IconNeed help?

Do you have a question about the Sharp 21LT-45SES and is the answer not in the manual?

Sharp 21LT-45SES Specifications

General IconGeneral
BrandSharp
Model21LT-45SES
CategoryTV
LanguageEnglish

Summary

SHARP Service Manual

Electrical Specifications

General Safety Warning

Warns about hot chassis and electric shock hazards during servicing.

Important Servicing Notes

High Voltage System and CRT Servicing Safety

Details safety procedures for servicing high voltage systems and CRT, including static discharge.

X-Ray Safety Precautions

Outlines precautions to reduce risks associated with potential X-ray radiation levels during servicing.

Pre-Return Service Checks

Lists checks to be performed before returning the serviced TV to the customer.

Controls and Terminals

Remote Control Functions Overview

Identifies and describes the buttons and functions of the remote control.

SHARP 21LT-45SES Parts Listing

Replacement Parts Identification

Identifies replacement parts crucial for safety and their specific features.

SHARP AK-44 CHASSIS Service Manual

AK-44 CHASSIS Table of Contents

Safety Precautions Overview

Lists safety precautions to be observed during TV servicing.

Service Menu Operations Guide

Details how to access and use the service menu for adjustments.

Circuit Descriptions Summary

Provides detailed descriptions of the various circuits within the chassis.

Option List and Settings Explained

Covers options and service register settings related to the tuner and other features.

IC Descriptions and Block Diagrams

Describes key integrated circuits and their internal block diagrams.

AK-44 CHASSIS Safety Precautions

AK-44 CHASSIS Circuit Descriptions

Chroma and Luminance Processing

Explains the chroma decoder and luminance processor functions.

Digital TV Sound Processor (MSP34X0G)

Describes the MSP34X0G sound processor for TV audio.

SMPS Voltage Regulation

Describes the voltage regulation process in the SMPS using a feedback loop.

SMPS Standby Operation Details

Details the SMPS operation during standby mode.

Small Signal Processing (STV2248)

Describes the STV2248 video processor and its role in small signal functions.

Power Supply (SMPS) Overview

Details the SMPS transformer and its role in providing chassis voltages.

SMPS Voltage Protection Features

Details the over-voltage protection (OVP) functions in the SMPS.

IC Descriptions and Block Diagrams Listing

Lists key ICs and their internal block diagrams covered in the manual.

FM Demodulator and Audio Amplifier

Describes the FM demodulator, including PLL and Automatic Volume Leveling.

Microcontroller (µ-Controller) Overview

Describes the ST92195 microcontroller and its features.

SMPS Start Up Sequence

Explains the start-up sequence of the SMPS, including initial power delivery.

SMPS Current Protection Mechanism

Explains the current protection mechanism in the SMPS.

AK-44 CHASSIS IC Descriptions

ST92195 Microcontroller Pin Description

Shows the pin configuration and description for the ST92195 microcontroller.

STV224X Video Processor Pin Connections

Details the pin connections for the STV224X video processor IC.

MSP34X0G Sound Processor Description

Details the MSP34X0G sound processor for analog and digital TV audio.

AK-44 CHASSIS General Block Diagram

AK-44 CHASSIS Service Menu

Service Menu Entrance Procedure

Explains how to enter the service mode for alignments.

IF Adjustment Procedure

Explains how to perform IF (Intermediate Frequency) adjustments.

Service Adjustments Table

Details the parameters and default values for service adjustments.

Geometry Adjustment Procedures

Explains how to perform specific geometry adjustments like vertical size and position.

Geometry Menu Operations

Details how to access and adjust geometry settings via the service menu.

AK-44 CHASSIS Hotel Mode Functions

AK-44 CHASSIS Circuit Diagrams

Microcontroller & IF Circuits Schematic

Provides the schematic diagram for the microcontroller and IF circuits.

Related product manuals