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Sharp R-203EW

Sharp R-203EW
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R-202EW
R-203EW
MICROWAVE OVEN
In the interest of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.
WARNING TO SERVICE PERSONNEL: Microwave ovens con-
tain circuitry capable of producing very high voltage and
current, contact with following parts may result in a severe,
possibly fatal, electrical shock. (High Voltage Capacitor, High
Voltage Power Transformer, Magnetron, High Voltage Recti-
fier Assembly, High Voltage Harness etc..)
TABLE OF CONTENTS
Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ...................INSIDE FRONT COVER
BEFORE SERVICING ......................................................................................................INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL................................................................................................................ 1
MICROWAVE MEASUREMENT PROCEDURE ................................................................................................... 2
FOREWORD AND WARNING...............................................................................................................................3
PRODUCT SPECIFICATIONS ..............................................................................................................................4
GENERAL INFORMATION................................................................................................................................... 4
OPERATION ..........................................................................................................................................................6
TROUBLESHOOTING GUIDE ..............................................................................................................................9
TEST PROCEDURE ............................................................................................................................................10
TOUCH CONTROL PANEL ................................................................................................................................. 18
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 22
PICTORIAL DIAGRAM ........................................................................................................................................ 27
CONTROL PANEL CIRCUIT ...............................................................................................................................28
PARTS LIST ........................................................................................................................................................29
PACKING AND ACCESSORIES .........................................................................................................................33
S7116R202EPW/
R-202EW
R-203EW
MODELS
SERVICE MANUAL
SHARP CORPORATION
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
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Sharp R-203EW Specifications

General IconGeneral
Capacity20 liters
Power Output800 Watts
Control TypeMechanical
TurntableYes
Turntable Diameter255 mm
External FinishWhite
TypeMicrowave Oven
Dimensions (W x D x H)440 x 330 x 259 mm

Summary

Microwave Oven Safety Precautions

Pre-Servicing Safety Checks

Essential safety checks to perform before servicing any microwave oven.

Service Personnel Warnings and Procedures

High Voltage Component Hazards

Warning about severe or fatal electrical shock from high voltage components.

Pre-Servicing and Post-Testing Steps

Steps to follow before service and after testing is completed.

Microwave Leakage Measurement Procedure

Leakage Test Requirements and Preparation

Specifies limits, preparation steps, and equipment for leakage testing.

Performing the Leakage Test

Detailed steps for conducting the closed-door microwave leakage test.

Microwave Oven Service Manual Overview

Product Description and General Information

Overview of product features and general operating context.

Operation and Troubleshooting Guides

Guides for operating the oven and diagnosing issues.

Component and Wiring Information

Details on component replacement, wiring, and parts.

Product Specifications

Technical Specifications Summary

Lists electrical requirements, power output, dimensions, and control features.

General Oven Information

Grounding and Electrical Safety

Details safe grounding practices and electrical supply needs.

Oven Diagram and Control Panel Layout

Visual guide to oven parts and touch control panel functions.

Microwave Oven Operation Details

Operating Sequence and Power Levels

Describes oven states, cooking sequence, and power level controls.

Microwave Oven Circuit Schematics

Off and Cooking Condition Schematics

Circuit diagrams illustrating the oven's states during operation.

Component Functions and Descriptions

Door Mechanism and Safety Switches

Function of door latch, sensing, interlock, and monitor switches.

Key Electrical Components and Fuses

Describes the roles of fuses, motors, and high voltage components.

Troubleshooting Guide and Precautions

General Troubleshooting Precautions

Important warnings and procedures to follow before troubleshooting.

Troubleshooting Inoperative Oven Issues

Steps for diagnosing issues when the oven is not functioning.

Component Test Procedures

Magnetron and Power Transformer Tests

Procedures for testing the magnetron and power transformer.

Component Specific Test Procedures

Microwave Output Power Test

Procedure to measure microwave output power using a water temperature rise test.

Power Transformer Resistance Test

Steps to test the resistance of the power transformer coils.

Component Testing Details

High Voltage Component Tests

Procedures for testing the high voltage rectifier, capacitor, and temperature fuse.

Interlock Switch and Fuse Tests

Tests for the secondary interlock switch and C/T fuse.

Interlock System and Switch Tests

Door Sensing and Primary Interlock Relay Tests

Tests for door sensing switch and primary interlock relay (RY2).

Monitor Switch Functionality Test

Procedure to test the operation of the monitor switch.

Fuse and Control Panel Testing

Blown CT Fuse Diagnosis

Steps to test and diagnose issues related to a blown C/T fuse.

Touch Control Panel Assembly Testing

Procedure for testing the touch control panel assembly for defects.

Control Unit and Key Unit Testing

Control Unit Defect Identification

Lists symptoms indicating a defective control unit.

Key Unit Functionality Testing

Procedure to test the key unit of the touch control panel.

Relay and Defrost System Tests

Relay Operation Tests (RY1, RY2)

Procedures to test the operation of relays RY1 and RY2.

Express Defrost Function Test

Steps to test the Express Defrost function.

Printed Wiring Board and Voltage Tests

Foil Pattern and Transformer Voltage Tests

Tests for foil patterns on PWB and transformer voltage.

Touch Control Panel Assembly Details

Control Unit Internal Circuits

Describes units and circuits within the control unit.

LSI (Large Scale Integration) Description

LSI InputOutput Signal Definitions

Details the I/O signals and their functions for the LSI chip.

LSI Pin Functions and Data Signals

Key Unit and Component Control Signals

Describes signals for key input, display data, and component control.

General Servicing Precautions

Handling Electronic Components (CMOS LSI)

Precautions for handling CMOS LSI to prevent static damage.

Touch Control Panel Servicing

Procedures and precautions for servicing the touch control panel.

Component Replacement and Adjustment

High Voltage and Microwave Energy Safety

Critical warnings regarding high voltage and microwave energy hazards.

Wiring Safety and Outer Case Removal

Precautions for wiring and steps for removing the outer case.

Component Removal Procedures

Magnetron and High Voltage Components Removal

Steps for removing the magnetron, capacitor, and rectifier.

Power Transformer and Connector Removal

Procedures for removing the power transformer and positive lock connector.

Component Replacement Steps

Control Panel and Turntable Motor Replacement

Steps for replacing the control panel and turntable motor.

Cooling Fan Motor Removal and Installation

Procedures for removing and installing the cooling fan motor.

Door Switch and Mechanism Servicing

Door Switch Removal and Re-installation

Steps for removing and reinstalling door sensing, interlock, and monitor switches.

Door Switch Adjustment Procedure

Procedure for adjusting door switches for proper operation.

Door Replacement Procedure

Door Panel Disassembly and Sealer Film

Steps for disassembling the door panel and installing new sealer film.

Pictorial Diagram

Overall Oven Wiring Connections Diagram

Visual representation of major component wiring in the oven.

Control Panel Circuit Diagram

Detailed Circuitry of Control and Key Units

Detailed circuit diagram for the control and key units.

Replacement Parts List

Electric, Cabinet, and Control Panel Parts

Lists electrical, cabinet, and control panel components with part numbers.

Oven, Door, and Miscellaneous Parts

Lists components for oven, door, miscellaneous items, and hardware.

Ordering Replacement Parts

Required Information for Part Orders

Details required information for prompt and correct part orders.

Oven and Cabinet Parts Diagram

Assembly View of Oven and Cabinet Components

Exploded view showing placement of oven and cabinet parts.

Control Panel and Door Parts Diagram

Control Panel Assembly Components Diagram

Diagram illustrating components of the control panel assembly.

Door Assembly Components Diagram

Diagram showing the parts that make up the oven door assembly.

Packing and Accessories

Packing Materials and Included Accessories

Details packing materials and accessories that come with the oven.

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