Sharp 21v-r70MM

SERVICE MANUAL
21V-R70MM
COLOUR TELEVISION
Chassis No. GA6
21V-R70MM
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.
S677421VR70MM
MODEL
ELECTRICAL SPECIFICATIONS
Chassis No. GA4
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 110-230 V, 50/60 Hz
POWER RATING .....................................................82W
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.

Sharp 21v-r70MM Specifications

General

Brand	Sharp
Model	21v-r70MM
Category	TV
Language	English

Summary

IMPORTANT SERVICE SAFETY PRECAUTION

X-RADIATION AND HIGH VOLTAGE LIMITS

Procedures and instructions for X-radiation and high voltage limits.

SERVICING OF HIGH VOLTAGE SYSTEM AND PICTURE TUBE

Procedures for servicing high voltage systems and picture tubes.

IMPORTANT SERVICE SAFETY PRECAUTION (Continued)

BEFORE RETURNING THE RECEIVER (Fire & Shock Hazard)

Safety checks for fire and shock hazards before returning the receiver.

SAFETY NOTICE

Importance of using specified replacement parts for safety.

INSTALLATION AND SERVICE INSTRUCTIONS

CIRCUIT PROTECTION

Details about the receiver's circuit protection fuse.

X-RADIATION PROTECTOR CIRCUIT TEST

Procedure for testing the X-radiation protection circuit.

HIGH VOLTAGE CHECK

Procedure for checking the high voltage.

SERVICE MODE

Service Mode Overview

Overview of how to enter and operate the service mode.

Service Mode Types

Entry points for Adjustment, Setting, Check, and Option modes.

Adjustment Mode Items

V01-V21 Adjustment Items

Detailed list of adjustment items V01 through V21.

M01-M06 Adjustment Items

Detailed list of adjustment items M01 through M06.

SELF ADJUSTMENT PROCEDURES

H-VCO Self Adjustment

Procedure for H-VCO self-adjustment.

RF-AGC Self Adjustment

Procedure for RF-AGC self-adjustment.

PIF-VCO Self Adjustment

Procedure for PIF-VCO self-adjustment.

Setting Mode Items

F01-F54 Setting Items

Detailed list of setting items F01 through F54.

Setting Mode Items (Continued)

F55-F70 Setting Items

Detailed list of setting items F55 through F70.

Option Mode Items

Option Items 001-030

Detailed list of option items 001 through 030.

Check Mode Information

Information shown in check mode.

ADJUSTMENT METHOD

Memory Map Data Structure

Explanation of the service mode data stages.

First Stage Service Data

Service mode data for the first stage.

Auto Adjustment Items

List of items for auto-adjustment.

ADJUSTMENT PROCEDURE

OPTION SET UP

Procedure for option setup.

OSD CHECKING

ADJUSTMENT PROCEDURE (Continued)

DATA SETUP FOR FIRST AND SECOND STAGE SERVICE DATA

Data setup for first and second stage service data.

H-POSITION Adjustment (V07)

V-SIZE Adjustment (V09)

V-PHASE Adjustment (V06)

CLOSED CAPTION SET UP Adjustment (V18)

H-VCO Adjustment (V21)

PIF-VCO Adjustment (V10)

RF-AGC Adjustment (V08)

SCREEN Adjustment (V11, V12, V13)

WHITE BALANCE Adjustment (V14,V15,V11, V12, V13)

SUB-BRIGHT Adjustment (V04)

SUB-PICTURE Adjustment (V01)

SUB-TINT Adjustment (V02)

SUB-COLOR Adjustment (V03)

X-RAY PROTECTION OPERATING CONFIRMATION

HIGH VOLTAGE Measurement

WAVEFORMS

Signal Waveform Examples

CHASSIS LAYOUT

Chassis Component Layout

MAIN BLOCK DIAGRAM

TV System Block Diagram

BLOCK DIAGRAM (Continued)

TV System Block Diagram (Continued)

CRT BLOCK DIAGRAM

CRT Unit Block Diagram

DESCRIPTION OF SCHEMATIC DIAGRAM

WAVEFORM MEASUREMENT CONDITIONS

Conditions for measuring waveforms.

VOLTAGE MEASUREMENT CONDITIONS

Conditions for measuring voltages.

SCHEMATIC DIAGRAM: MAIN UNIT

SCHEMATIC DIAGRAM: MAIN UNIT (Continued)

SCHEMATIC DIAGRAM: CRT UNIT

PRINTED WIRING BOARD ASSEMBLIES

PWB-A: MAIN UNIT (Chip Parts Side)

PRINTED WIRING BOARD ASSEMBLIES (Continued)

PWB-B: CRT UNIT (Wiring Side)

SHARP PARTS GUIDE

Picture Tube Parts

Printed Wiring Board Parts

Main Unit Parts

CRT Unit Parts

MAIN UNIT Parts List

Integrated Circuits and Transistors

Diodes

MAIN UNIT Parts List (Continued)

Inductors

Switches

Fuses and Fuse Holders

Connectors and Plugs

CRT UNIT Parts List

Capacitors

Resistors

Connectors