EasyManua.ls Logo

Sharp 14BM2 User Manual

Sharp 14BM2
40 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
Page #1 background imageLoading...
Page #1 background image
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
Question and Answer IconNeed help?

Do you have a question about the Sharp 14BM2 and is the answer not in the manual?

Sharp 14BM2 Specifications

General IconGeneral
BrandSharp
Model14BM2
CategoryTV
LanguageEnglish

Summary

Service Manual Features and Contents

Features

Lists the key features of the colour television.

Contents

Provides a detailed table of contents for the service manual.

Specifications and Service Notes

Specifications

Details technical specifications for different TV models.

Important Service Notes

Crucial safety and operational guidelines for service personnel.

Servicing High Voltage System and Picture Tube

Specific instructions for handling high voltage and picture tube.

X-Ray Precautions

Safety measures to prevent hazardous X-ray radiation during servicing.

Adjustment and Service Modes

Adjustment Precautions

General precautions before performing adjustments.

Service Mode Operation

Explains how to enter and navigate the service mode.

Service Mode Adjustment Flow

Diagram illustrating the flow for different adjustment modes.

User Data and Mode Settings

User Data in Service Mode

Details user data settings available in service mode.

Mode List Flow

Shows the sequence of modes accessible via RC commands.

EEPROM Initialization and Settings

EEPROM Initialization

Procedure for reading and initializing EEPROM data.

EEPROM Items and Settings

List of EEPROM items, data length, and initial settings.

Initial and Shipping Settings

Initial Setting Procedure

Steps for storing tuning data in E2PROM after initial setup.

Shipping Setting and Checking

Default factory settings for E2PROM at shipping.

Factory Settings by Models

Model-specific factory settings for Geomagnetism Adjustment.

PIF and Purity Adjustments

PIF Adjustment

Procedure for adjusting the PIF section using test signals.

Purity Adjustment

Steps for adjusting picture purity using magnets.

Convergence and CRT Adjustments

Convergence Adjustment

Procedure for static and dynamic convergence adjustments.

CRT Cut-off, Background, and Sub-Contrast

Adjustments for CRT cut-off, background, and sub-contrast.

Maximum Beam Check

Procedure to check the maximum beam current for CRT.

Video, Audio, Chroma, and Protector Checks

Horizontal, Vertical, Deflection Loop, and Focus Adjustment

Adjustments for horizontal, vertical, deflection loop, and focus.

NTSC Chroma Adjustment

Procedure for adjusting NTSC chroma signals.

PAL Chroma Adjustment

Procedure for adjusting PAL chroma signals.

Protector Operation Checking

Checks for protector circuit operation under various conditions.

A/V Input and Output Checking

Verification of audio/video input and output signals.

Function Operation Checks

Contrast, Colour, Brightness, Tint, Sharpness Checks

Checks for basic picture controls using test patterns.

Channel Display Colour

Checks the OSD channel number display colour.

Normal Key and White Temp Checks

Checks for normal mode settings and white temperature adjustments.

Colour System and Sound System Checks

Verifies operation of colour systems and sound systems.

Noise Mute and OSD Language Checks

Tests noise mute effectiveness and OSD language display.

Memory Map Overview

Memory Map Details

Comprehensive map of EEPROM addresses and their functions.

Memory Map Continuation

Memory Map Addressing (Part 2)

Further details on EEPROM addresses and settings.

Memory Map Continuation (Part 3)

Memory Map Addressing (Part 3)

Additional EEPROM addresses and their corresponding data.

Memory Map Continuation (Part 4)

Memory Map Addressing (Part 4)

Final EEPROM addresses and settings details.

Hotel Mode and Troubleshooting

UA1 Hotel Mode Application Note

Instructions for enabling and using the hotel mode feature.

Trouble Shooting Table - No Raster

Troubleshooting steps for when the TV has no raster.

Troubleshooting Common Issues

Trouble Shooting - No Picture/Sound

Diagnostic steps for missing picture or sound.

Trouble Shooting - No Sound

Steps to diagnose and fix no sound issues.

Trouble Shooting - Synchronization Issues

Diagnosing problems with vertical or horizontal synchronization.

Trouble Shooting - Vertical Linearity

Addressing defects in vertical amplification and linearity.

Trouble Shooting - No Vertical Scan

Steps to resolve issues with the vertical scan.

Troubleshooting Colour Issues

Trouble Shooting - No Specific Colour

Diagnosing issues with specific colours or colour reproduction.

Trouble Shooting - No Specification Colour (PAL/SECAM)

Resolving colour synchronization problems in PAL/SECAM.

Solid State Device Base Diagram

Component Pinouts and Diagrams

Visual representation of semiconductor device pin configurations.

Chassis Layouts by Model

Chassis Layout: 14BM2S/G

Diagram showing component placement on the 14BM2S/G chassis.

Chassis Layout: 20BM2S/G

Diagram showing component placement on the 20BM2S/G chassis.

Chassis Layout: 21BM2S/G

Diagram showing component placement on the 21BM2S/G chassis.

Block Diagrams

Main Unit Block Diagram

Functional block diagram of the main unit.

CRT Unit Block Diagram (14BM2S/G)

Block diagram for the CRT unit of 14BM2S/G models.

CRT Unit Block Diagram (20/21BM2S/G)

Block diagram for the CRT unit of 20/21BM2S/G models.

Waveforms

Standard Waveform Examples

Illustrations of key waveforms with voltage and time measurements.

Schematic Diagram Description

Safety and Service Precautions

Important safety notes and service precautions for schematic diagrams.

Schematic Diagram Notes

General notes regarding resistance, wattage, and capacitor units.

Voltage and Waveform Measurement Conditions

Conditions required for accurate voltage and waveform measurements.

Main Unit Schematic Diagrams

Main Unit Schematic: 14BM2S/G

Schematic diagram for the main unit of 14BM2S/G models.

Main Unit Schematic: 20BM2S/G

Schematic diagram for the main unit of 20BM2S/G models.

Main Unit Schematic: 21BM2S/G

Schematic diagram for the main unit of 21BM2S/G models.

CRT Unit Schematic Diagrams

CRT Unit Schematic: 14BM2S/G

Schematic diagram for the CRT unit of 14BM2S/G models.

CRT Unit Schematic: 20BM2S/G

Schematic diagram for the CRT unit of 20BM2S/G models.

CRT Unit Schematic: 21BM2S/G

Schematic diagram for the CRT unit of 21BM2S/G models.

Printed Wiring Board Assemblies

PWB-A: Main Unit (Wiring Side)

Wiring diagram for the main unit's PWB-A.

PWB-A: Main Unit (Chip Parts Side)

Component layout diagram for PWB-A, main unit.

PWB-B: CRT Unit (Wiring Side)

Wiring diagram for the CRT unit's PWB-B.

Replacement Parts List - Integrated Circuits and Transistors

Tuners and Integrated Circuits

Part numbers and descriptions for tuners and ICs.

Transistors

Part numbers and descriptions for transistors.

Diodes

Part numbers and descriptions for diodes.

Replacement Parts List - Diodes, Transformers, Capacitors

Diodes (Continued)

Additional diode part numbers and descriptions.

Transformers

Part numbers and descriptions for various transformers.

Capacitors

Part numbers and descriptions for capacitors.

Replacement Parts List - Capacitors, Resistors, Miscellaneous

Capacitors (Continued)

Additional capacitor part numbers and descriptions.

Resistors

Part numbers and descriptions for resistors.

Miscellaneous Parts

Part numbers for miscellaneous components.

Replacement Parts List - Resistors, Baluns, Switches

Resistors (Continued)

Additional resistor part numbers and descriptions.

Baluns

Part numbers and descriptions for balun components.

Switches

Part numbers and descriptions for various switches.

Replacement Parts List - Miscellaneous, Accessories, Packing

Miscellaneous Parts (Continued)

Additional miscellaneous part numbers.

Supplied Accessories

List of supplied accessories with part numbers.

Accessory (Not Replacement Item)

List of non-replaceable accessories.

Packing Parts

List of packing materials included with the product.

Cabinet Parts and Illustrations

Cabinet Parts (14BM2S/G)

List and diagram of cabinet parts for 14BM2S/G models.

Cabinet Parts (20BM2S/G)

List and diagram of cabinet parts for 20BM2S/G models.

Cabinet Parts and Illustrations (Continued)

Cabinet Parts (21BM2S/G)

List and diagram of cabinet parts for 21BM2S/G models.

Related product manuals