Sharp R-203BW

R-203BW
R-209BK
R-220BW
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 ........................................................................................................................................28
CONTROL PANEL CIRCUIT ...............................................................................................................................29
PRINTED WIRING BOARD .................................................................................................................................30
PARTS LIST ........................................................................................................................................................31
PACKING AND ACCESSORIES .........................................................................................................................36
S1803R220BPW/
R-203BW
R-209BK
R-220BW
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.
1 2
3
4 5 6
7 8
0
9
DEFROST
EXPRESS MINUTE
PLUS
SNACKS
COOKING
REHEATING
POPCORN BEVERAGE
BAKED FRESH
POTATO
VEGETABLES
DINNER
PLATE
ROLL,
MUFFIN

Sharp R-203BW Specifications

General

Microwave Power	800W
Control Type	Mechanical
Turntable	Yes
Frequency	50Hz
Capacity	20 Litres
Voltage	230V

Summary

Microwave Oven Servicing Safety Precautions

Pre-Servicing Safety Checks and Precautions

Essential safety checks before operating or servicing microwave ovens.

Warning to Service Personnel

Microwave Leakage Measurement Procedure

Component Functions and Description

Door Mechanism and Safety Interlock Switches

Explanation of door opening, interlock, and monitor switches.

Key Safety Devices: CT Fuse and Thermal Cut-out

Function of the C/T fuse and magnetron thermal cut-out.

Troubleshooting and Test Procedures

Troubleshooting Precautions

Important safety precautions before and during troubleshooting.

Problem Cause and Effect Chart

Table mapping problems to possible causes and defective parts.

High Voltage Component Testing

Procedures for testing high voltage rectifier, capacitor, magnetron, and transformer.

Switch and Interlock System Testing

Testing door sensing, monitor, interlock switches, and C/T fuse.

Control Panel and Unit Testing

Touch Control Panel Servicing

Handling Electronic Components and CMOS LSI

Precautions for handling CMOS LSI and electronic components.

Touch Control Panel Servicing Methods

Component Replacement and Adjustment Procedures

High Voltage Safety and Outer Case Removal

High voltage warnings and steps for removing the outer case.

Magnetron and High Voltage Component Removal

Procedures for removing magnetron, rectifier, and capacitor.

Switch Adjustment and Door Replacement