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Sharp 14BM2G

Sharp 14BM2G
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1
14BM2, 14BM2S/G
20BM2, 20BM2S/G
21BM2, 21BM2S/G
SERVICE MANUAL
14BM2, 14BM2S/G
20BM2, 20BM2S/G
21BM2, 21BM2S/G
MODELS
In the interests of user-safety (Required by safety regulations in some countries) the set should be restored
to its original condition and only parts identical to those specified should be used.
Ë
Multi 18 Systems
Ë
Full Auto Channel Preset and Auto Channel Skip
Ë
100-CH Program Memory
Ë
High Contrast Picture
Ë
Black Stretch Circuit
Ë
CATV (Hyper Band) Ready
Used Frequency Synthesizer Tuner
Ë
Hotel Mode
Ë
On Timer/Sleep Timer/Reminder Timer
Ë
Colour Comb Filter Function (NTSC only)
Ë
Blue Back Noise Mute
Ë
Front AV-In & Rear AV-In/Out Terminals
Ë
AVL Function
Ë
English/Chinese/Malay/France/Russia/Arabic OSD
» SPECIFICATIONS ........................................... 2
» IMPORTANT SERVICE NOTES ...................... 2
» ADJUSTMENT PRECAUTIONS ..................... 3
» HOTEL MODE APPLICATION NOTE............ 15
» TROUBLE SHOOTING TABLE......................15
» SOLID STATE DEVICE BASE DIAGRAM ..... 18
» CHASSIS LAYOUT ........................................19
» BLOCK DIAGRAM.........................................22
» WAVEFORMS ...............................................25
» DESCRIPTION OF SCHEMATIC DIAGRAM .. 27
» SCHEMATIC DIAGRAM
MAIN UNIT ............................................... 28
CRT UNIT................................................. 34
» PRINTED WIRING BOARD ASSEMBLIES ... 36
» REPLACEMENT PARTS LIST
ELECTRICAL PARTS ............................... 41
MISCELLANEOUS PARTS ...................... 46
SUPPLIED ACCESSORIES..................... 46
PACKING PARTS ..................................... 46
CABINET PARTS .....................................46
Page
Page
CONTENTS
The chassis in this receiver is partially hot. Use an isolation transformer between the line cord plug and power
receptacle, when servicing this chassis. To prevent electric shock, do not remove cover. No user – serviceable
parts inside. Refer servicing to qualified service personnel.
SHARP CORPORATION
WARNING
COLOUR TELEVISION
Chassis No. UA-1
S00K414BM2S//
14BM2, 14BM2S/G
20BM2, 20BM2S/G
21BM2, 21BM2S/G
FEATURE
SERVICE MANUAL
COLOUR TELEVISION
MODELS 14BM2, 14BM2S/G, 20BM2, 20BM2S/G, 21BM2, 21BM2S/G
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Sharp 14BM2G Specifications

General IconGeneral
BrandSharp
Model14BM2G
CategoryTV
LanguageEnglish

Summary

Service Manual Introduction and Safety

Product Features Overview

Highlights the various functionalities and technologies integrated into the models.

Critical Safety Warning

Essential safety precautions for handling the television during servicing.

Technical Specifications and Service Notes

TV Model Specifications

Detailed technical data for the 14BM2, 20BM2, and 21BM2 series TVs.

Key Service Maintenance Notes

Critical guidelines for qualified service personnel during maintenance.

Adjustment Procedures

Pre-Adjustment Precautions

Precautions to take before performing any adjustments on the TV.

Service Mode Access and Navigation

Instructions for entering and using the TV's service mode.

PIF (Picture IF) Adjustment

Procedure for tuning the Intermediate Frequency (IF) amplifier section.

CRT Purity Alignment

Steps to ensure correct color purity on the CRT screen.

Convergence Alignment Procedure

Method for aligning electron beams for optimal image sharpness.

CRT Cut-off and Level Adjustments

Adjustments for CRT black level, background, and sub-contrast settings.

Image Geometry and Focus Adjustments

Adjustments for image geometry and focus.

Color Signal Adjustments (NTSCPAL)

Procedures for tuning color signals in NTSC and PAL broadcast systems.

Video and Audio Functionality Checks

Verification of video and audio playback and input functions in normal mode.

Troubleshooting Guide

Hotel Mode Functionality Guide

Guide for enabling and managing the hotel mode feature.

Troubleshooting: No Raster Issues

Diagnostic steps for television sets with no picture or sound.

Troubleshooting: No PictureSound

Steps to diagnose and resolve issues related to missing picture or sound.

Troubleshooting: Audio Only Issues

Diagnostic steps for television sets with no audio output.

Troubleshooting: Color Reception Problems

Steps to diagnose and resolve problems with color reception.

Diagrams and Schematics

Component Pin Configuration Diagrams

Visual guide to the pin configurations of semiconductor components.

Chassis Component Layouts

Visual representation of component placement on the main and CRT units.

Unit Block Diagrams (Main & CRT)

Functional block diagrams for the main unit and CRT unit.

Signal Waveform Reference

Display of expected signal waveforms for various test points.

Schematic Diagram Explanation

Explanation of schematic symbols and circuit operation notes.

Parts and Assembly Information

PCB Component Layout Diagrams

Diagrams showing component layout on PCB wiring sides.

Serviceable Parts List

Detailed list of replaceable parts with part numbers and codes.

External Cabinet Components

List of external cabinet components and accessories for replacement.

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