Sharp R-203CW

R-203CW
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 ..............................................................................................................................8
TEST PROCEDURE ............................................................................................................................................10
TOUCH CONTROL PANEL .................................................................................................................................17
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................21
PICTORIAL DIAGRAM ........................................................................................................................................27
CONTROL PANEL CIRCUIT ...............................................................................................................................28
PRINTED WIRING BOARD .................................................................................................................................29
PARTS LIST ........................................................................................................................................................30
PACKING AND ACCESSORIES .........................................................................................................................34
S2902R203CPW/
R-203CW
MODEL
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.
1. Ground meat
2. Steaks/chops
3. Chicken pieces
To adjust quantity-touch pad again
COMPU DEFROST
POPCORN
BEVERAGE
BAKED
POTATO
DINNER
PLATE
Power
Level
Timer
Clock
Stop
Clear
START

Minute Plus
ROLL,

MUFFIN
FRESH
VEGETABLES
SNACKS
COOKING
REHEATING
123
456
78
0
9
DEF. LBS. QTY.
CHECK
ON

Sharp R-203CW Specifications

General

Brand	Sharp
Model	R-203CW
Category	Microwave Oven
Language	English

Summary

Safety Precautions for Servicing

Before Servicing

Procedures to follow before starting any servicing.

Service Personnel Warnings

Pre-Service Procedures

Steps to disconnect power and discharge capacitor.

Post-Test Procedures

Steps after completing tests.

Post-Repair Procedures

Steps after completing repairs.

Microwave Measurement Procedure

Test Requirements

Specifies limits for microwave leakage.

Test Preparation

Steps for preparing the oven and equipment.

Leakage Test Steps

Detailed steps for performing the leakage test.

Product Overview

Specifications

Lists technical specifications of the microwave oven.

General Information

Grounding Instructions

Explains proper grounding procedures for safety.

Operation Details

Operating Sequence

Details the sequence of operation for the oven.

Variable Power Cooking

Explains variable power cooking levels.

Schematics and Component Functions

Oven Schematics

Electrical diagrams for oven operation states.

Component Descriptions

Explains functions of key components.

Troubleshooting Guide

Problem Diagnosis

Table linking problems to potential causes/parts.

Component Test Procedures

Magnetron Assembly Test

Procedure to test the magnetron.

Microwave Output Power Test

Procedure to measure microwave power output.

Power Transformer Test

Procedure to test the power transformer.

High Voltage Rectifier Test

Procedure to test the HV rectifier.

High Voltage Capacitor Test

Procedure to test the HV capacitor.

Magnetron Thermal Cut-Out Test

Procedure to test the magnetron thermal cut-out.

Secondary Interlock Switch Test

Procedure to test the secondary interlock switch.

Door Sensing Switch Test

Procedure to test the door sensing switch.

Primary Interlock Relay Test

Procedure to test the primary interlock relay.

Monitor Switch Test

Procedure to test the monitor switch.

Blown CT Fuse Test

Procedure to test for a blown C/T fuse.

Touch Control Panel Testing

Key Unit Test

Procedure to test the key unit of the control panel.

Control Unit Diagnosis

Symptoms indicating a defective control unit.

Specific Component Tests

Relay Test

Checks the operational voltage and function of relays.

Compu Defrost Test

Checks the operation of the Compu Defrost function.

Printed Wiring Board Test

Foil Pattern Test

Inspects and repairs foil patterns on the PWB.

Control Panel Assembly Details

Key Unit Function

Explains the function of the key unit.

Control Unit Functions

Details functions of the control unit components.

LSI Description

LSI Signal Details

Lists and describes LSI pin signals and functions.

Servicing Guidelines

Component Handling Precautions

Guidelines for safely handling electronic components.

Touch Control Panel Servicing

Procedures for servicing the touch control panel.

Component Replacement & Adjustment

Outer Case Removal

Steps to remove the outer case of the oven.

Magnetron Removal

Procedure to remove the magnetron.

High Voltage Components Removal

Procedure to remove HV capacitor and rectifier.

Power Transformer Removal

Procedure to remove the power transformer.

Oven Lamp Removal

Procedure to remove the oven lamp and socket.

Connector Removal

Procedure to remove positive lock connectors.

Control Panel Removal

Procedure to remove the control panel assembly.

Turntable Motor Removal

Procedure to remove the turntable motor.

Cooling Fan Motor Removal

Procedure to remove the cooling fan motor.

Switch Removal

Procedure to remove door safety switches.

Switch Adjustment

How to adjust door safety switches.

Door Replacement

Procedure for replacing the oven door.

Door Disassembly

Steps to disassemble the oven door.

Sealer Film Installation

Procedure for installing the door sealer film.

Parts List

Electric Parts

Lists electrical components and their part numbers.

Cabinet Parts

Lists cabinet components and their part numbers.

Control Panel Parts

Lists control panel components and their part numbers.

Oven Parts

Lists oven cavity and related parts.

Door Parts

Lists parts specific to the oven door.

Miscellaneous Parts

Lists miscellaneous items like harnesses and manuals.

Screws and Washers

Lists various screws and washers used in the unit.

Packing and Accessories

Included Accessories

Lists items included with the microwave oven.