Sharp 21V1-L

SERVICE MANUAL
COLOUR TELEVISION
Chassis No. GA6
21V1-L
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 indentical to those specified should be used.
S8811021V1L
MODEL
ELECTRICAL SPECIFICATIONS
Chassis No. GA8
CONTENTS
IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................................... 1-1
Page
LOCATION OF USER’S CONTROL ...................................................................................................................... 2-1
INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................................. 3-1
SERVICE MODE ..................................................................................................................................................... 4-1
ADJUSTMENT METHOD ........................................................................................................................................ 5-1
WAVEFORMS ......................................................................................................................................................... 6-1
CHASSIS LAYOUT ................................................................................................................................................. 7-1
BLOCK DIAGRAM .................................................................................................................................................. 8-1
DESCRIPTION OF SCHEMATIC DIAGRAM .......................................................................................................... 9-1
SCHEMATIC DIAGRAMS ......................................................................................................................................10-1
PRINTED WIRING BOARD ASSEMBLIES ........................................................................................................... 11-1
Parts Guide
POWER INPUT............................AC 110-220 V, 50/60 Hz
POWER RATING .....................................................76W
PICTURE SIZE .............................1,239 cm
2
(192sq inch)
CONVERGENCE ............................................. Magnetic
SWEEP DEFLECTION .................................. .. Magnetic
FOCUS ......................................................... Electrostatic
INTERMEDIATE FREQUENCIES
Picture IF Carrier Frequency ...................... 45.75 MHz
Sound IF Carrier Frequency ...................... 41.25 MHz
Color Sub-Carrier Frequency ......................42.17 MHz
(Nominal)
AUDIO POWER
OUTPUT RATING... ...................... 3.0 W(RMS) x 1pc
SPEAKER
SIZE ........................................................ 2” X 3.5”, 1pc
VOICE COIL IMPEDANCE .................16 ohm at 400 Hz
ANTENNA INPUT IMPEDANCE
VHF/UHF ........................................75 ohm Unbalanced
TUNING RANGES
VHF-Channels ................................................. 2 thru 13
UHF-Channels ................................................14 thru 69
CATV Channels ............................................. 1 thru 125
(EIA, Channel Plan U.S.A.)
Specifications are subject to change without
prior notice.
SHARP CORPORATION
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
21V1-L

Sharp 21V1-L Specifications

General

Brand	Sharp
Model	21V1-L
Category	TV
Language	English

Summary

IMPORTANT SERVICE SAFETY PRECAUTION

General Safety Warnings

Critical warnings for technicians during servicing, including electrical shock.

High Voltage and X-Radiation Safety

Precautions for high voltage systems and X-ray emissions.

Pre-Return Safety Checks

Final safety inspections before user delivery.

LOCATION OF USERS CONTROL

Front and Rear Panel Controls

Identification and function of front/rear panel controls and connections.

INSTALLATION AND SERVICE INSTRUCTIONS

Circuit Protection and Tests

Details on protection circuits, X-ray tests, and HV checks.

SERVICE MODE

Service Mode Navigation and Restrictions

How to enter, use, and restrictions of service modes.

AUTO ADJUSTMENT PROCEDURES

Key Auto Adjustment Steps

Procedures for H-VCO, RF-AGC, PIF-VCO, and S-TRAP auto adjustments.

ADJUSTMENT METHOD

Adjustment Setup and Data

Bus options and data setup for service adjustments.

Key Adjustment Procedures

Instructions for H-Pos, V-Size, V-Phase, CC, H-VCO, PIF-VCO, RF-AGC, S-TRAP.

Picture and Color Adjustments

Procedures for Screen, White Balance, Sub-Bright, Sub-Picture, Sub-Tint, Sub-Color.

CONFIRMATION PROCEDURES

X-Ray Protection Confirmation

Verification of the X-ray protection circuit operation.

High Voltage Check

Procedure to check CRT anode voltage.

WAVEFORMS

Waveform Analysis

Visual representations of various signal waveforms.

CHASSIS LAYOUT

Main and CRT Unit Layouts

Component placement diagrams for main and CRT PCBs.

BLOCK DIAGRAM

CRT, Main, and Control Block Diagrams

Functional block diagrams of key TV sections.

DESCRIPTION OF SCHEMATIC DIAGRAM

Schematic Interpretation Guidelines

Notes, voltage, and waveform measurement conditions.

SCHEMATIC DIAGRAM

PWB-B and Main GA8 Schematics

Detailed circuit diagrams for CRT and main units.

PRINTED WIRING BOARD ASSEMBLIES

PWB Layouts (Wiring and Chip Sides)

Component layout diagrams for main and CRT PCBs.

PARTS GUIDE

Component Listings

Parts for Picture Tube, PWBs, Main Unit, CRT Unit, Accessories, Cabinet, Packing.