Sharp R-1720 - User Manual

R-7280
R-1720
.
SHARP SERVICE MANUAL
S6703R7280J//
MICROWAVE OVEN
MODELS R-7280
R-l 720
Photo R-7280
in the interests of user-safety the set should be restored to its original
condition and only parts identical to those specified should be used.
( RD16101 U)
TABLE OF CONTENTS
FOREWORD
Page
. . . . . . . . . . . ..*.....*...........*................*......................................................................................................
I
CAUTION, MICROWAVE RADIATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..*...........................*..........
1
PRODUCT DESCRIPTION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..*.......*..........................
2
OPERATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..I.................................................................................................
4
SERVICING
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..*......................................................................
7
TOUCH CONTROL PANEL ASSEMBLY
. . . . . . . . . . . . . . . . . . . . . . . * . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14
COMPONENT
REPLACEMENT
AND
ADJUSTMENT PROCEDURE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
MICROWAVE MEASUREMENT PROCEDURE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25
PICTORIAL DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..........
26
CONTROL PANEL CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..a.... . . . ..a..... . . . . . . . ..,.....a... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27
PRINTED WIRING BOARD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..~.............................................................
PARTS LIST
28
*........................................................................................................,.......................................... 29
PACKING AND ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36
SHARPCORPORATION

Sharp R-1720 Specifications

General

Brand	Sharp
Model	R-1720
Category	Microwave Oven
Language	English

Summary

FOREWORD

Microwave Radiation Safety Warning

Safety warning about microwave energy exposure.

PRODUCT DESCRIPTION

Explanation of Microwave Cooking

Details on how microwave cooking works and its principles.

Specifications

Technical specifications of the microwave oven.

OVEN DIAGRAM

Auto-Touch Control Panel Diagram

Visual representation and labeling of the control panel interface.

OPERATION

Operating Sequence Description

Step-by-step explanation of how the oven operates.

Variable Cooking Power Modes

Explanation of different power level settings and their operation.

SERVICING

Troubleshooting Guide

Guidance for diagnosing and resolving common oven problems.

TEST PROCEDURES

Magnetron and Output Power Tests

Procedures for testing the magnetron and measuring microwave output power.

Component Electrical Tests

Tests for transformer, rectifier, capacitor, and switches.

Switch and Fuse Tests

Procedures for testing latch switches, monitor switch, and fuses.

Touch Control Panel Assembly Test

Steps to test the functionality of the touch control panel.

TOUCH CONTROL PANEL ASSEMBLY

Panel Component Overview

Details on the key unit, control unit, LSI, and other panel components.

LSI Description

Pin assignments and signal descriptions for the LSI chip.

SERVICING PRECAUTIONS AND TOOLS

Electronic Component Handling Precautions

Precautions for handling PMOS LSI and electronic components.

Touch Control Panel Servicing and Tools

Procedures, tools, and cautions for servicing the touch control panel.

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

Component Removal Procedures

Instructions for safely removing parts like the case, magnetron, and transformer.

Door Replacement and Adjustment

Guide for replacing and properly aligning the microwave oven door.

MICROWAVE MEASUREMENT

Radiation Leakage Test

Procedure for measuring microwave radiation leakage from the oven.

SCHEMATICS AND DIAGRAMS

Pictorial Diagram

Visual representation of the oven's internal wiring and components.

Printed Wiring Board Layout

Diagram showing the physical arrangement of components on the PWB.

Control Panel Circuit Diagram

Schematic illustration of the control panel's electrical connections.

PARTS LIST

Component Parts Listings

Comprehensive lists of electrical, cabinet, and control panel parts.

PACKING AND ACCESSORIES

Oven Accessories and Packing Details

Information on included accessories and how the oven is packed.