Sharp R-305EW

R-305EW
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
POWER UNIT CIRCUIT ......................................................................................................................................29
CPU UNIT CIRCUIT ............................................................................................................................................30
PRINTED WIRING BOARD .................................................................................................................................31
PARTS LIST ........................................................................................................................................................32
PACKING AND ACCESSORIES .........................................................................................................................36
S2104R305EPW/
MICROWAVE OVEN
MODEL
R-305EW
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.
POWER
LEVEL
TIMER
CLOCK
1 2 3
4 5 6
7 8
0
9
TO ADJUST QUANTITY TOUCH PAD AGAIN
1 GROUND MEAT
2 STEAKS/CHOPS
3 CHICKEN PIECES
STOP
CLEAR
START
DEFOST
COOK
NO.
LBS.
CUPS.
OZ.
MINUTE PLUS
INSTANT ACTION
COMPU
DEFROST
POPCORN DINNER PLATE CASSEROLE
BAKED POTATOES FRESH VEGETABLE GROUND MEAT
FROZEN ENTREES BEVERAGE ROLLS / MUFFINS

Sharp R-305EW Specifications

General

Brand	Sharp
Model	R-305EW
Category	Microwave Oven
Language	English

Summary

Microwave Exposure Precautions

Pre-Servicing Steps

Guidelines to prevent microwave exposure during servicing.

Service Personnel High Voltage Warnings

Pre-Service Safety Steps

Critical warnings for personnel handling high voltage.

Microwave Leakage Measurement Procedure

Foreword

Product Overview

Overview of the product's features and design.

General Oven Information

General information and operational guidelines for the oven.

Oven Operation

Description of how the microwave oven operates.

Troubleshooting & Testing Guide

Guide to diagnose and test common oven problems.

Touch Control Panel Overview

Details about the oven's touch control panel.

Component Replacement & Adjustment

Procedures for replacing and adjusting oven components.

Electrical Wiring Diagrams

Electrical wiring diagrams for the microwave oven.

Service Parts List

List of all parts for the microwave oven.

Technical Specifications

Oven Diagram

Touch Control Panel Diagram

Diagram illustrating the touch control panel.

Oven Operation Details

Operating Sequence Description

Detailed description of the oven's operating sequence.

Variable Power Cooking Levels

Explanation of variable power cooking levels.

Oven Schematics

Component Descriptions & Functions

Door Opening Mechanism

Details on how the oven door opens and its mechanism.

Door Sensing & Interlock Switches

Explanation of door sensing and interlock switches.

Monitor Switch Function

Function and operation of the monitor switch.

Turntable Motor Details

Description of the turntable motor's function.

Cooling Fan Motor Function

Function of the cooling fan motor.

Monitor Fuse Role

Role and function of the monitor fuse.

Oven Thermal Cut-Out Function

Function of the oven's thermal cut-out.

Magnetron Thermal Cut-Out Function

Function of the magnetron's thermal cut-out.

Oven Troubleshooting Guide

Component Test Procedures (Part 1)

Magnetron Assembly Test

Test procedure for the magnetron assembly.

Power Transformer Test

Test procedure for the power transformer.

Component Test Procedures (Part 2)

High Voltage Rectifier Test

Test procedure for the high voltage rectifier.

High Voltage Capacitor Test

Test procedure for the high voltage capacitor.

Oven Thermal Cut-Out Test

Test procedure for the oven thermal cut-out.

Magnetron Thermal Cut-Out Test

Test procedure for the magnetron thermal cut-out.

Component Test Procedures (Part 3)

Secondary Interlock Switch Test

Test procedure for the secondary interlock switch.

Primary Interlock System Tests

Test procedure for the primary interlock system.

Monitor Switch Test

Test procedure for the monitor switch.

Component Test Procedures (Part 4)

Blown Monitor Fuse Test

Test procedure for a blown monitor fuse.

Touch Control Panel Assembly Test

Component Test Procedures (Part 5)

Key Unit Test

Test procedure for the key unit of the control panel.

Component Test Procedures (Part 6)

Relay Tests (RY1 & RY2)

Test procedures for relays RY1 and RY2.

Compu Defrost Test

Test procedure for the Compu Defrost function.

Component Test Procedures (Part 7)

PWB Foil Pattern Test

Test procedure for the foil pattern on the PWB.

Touch Control Panel Assembly Details

Touch Control Panel Outline

General outline of the touch control panel units.

LSI (IXA096 DR) Pinout

Details of the LSI (IXA096DR) pinout and signals.

Touch Control Panel Servicing

Handling Electronic Components Precautions

Precautions for handling electronic components like CMOS LSI.

Touch Control Panel Servicing Steps

Procedures for servicing the touch control panel.

Touch Panel Servicing Tools

List of tools required for servicing the touch control panel.

Touch Panel Servicing Other Precautions

Additional precautions during touch control panel servicing.

Component Replacement & Adjustment (Part 1)

Outer Case Removal Procedure

Step-by-step guide to remove the outer case of the oven.

Component Replacement & Adjustment (Part 2)

Power Transformer Removal

Procedure to remove the power transformer.

Terminal Insulator Replacement

Procedure for replacing the terminal insulator.

HV Rectifier & Capacitor Removal

Procedure to remove high voltage rectifier and capacitor.

Magnetron Removal Procedure

Procedure to remove the magnetron.

Component Replacement & Adjustment (Part 3)

Oven Lamp & Socket Removal

Procedure to remove the oven lamp and socket.

Positive Lock Connector Removal

Procedure to remove the positive lock connector.

Control Panel Assembly Removal

Procedure to remove the control panel assembly.

Component Replacement & Adjustment (Part 4)

Turntable Motor Removal

Procedure to remove the turntable motor.

Cooling Fan Motor Removal

Procedure to remove the cooling fan motor.

Door Switch Removal

Door Switch Adjustment

Adjustment procedures for door sensing, interlock, and monitor switches.

Oven Door Replacement

Oven Door Replacement Details

Door Sealer Film Installation

Installation procedure for the door sealer film.

Comprehensive Parts List

Parts Ordering Information

How to Order Replacement Parts

Instructions on how to order replacement parts.

Oven & Cabinet Parts Diagram

Control Panel Parts Diagram

Door Parts Diagram

Illustrated breakdown of door parts.

Miscellaneous Parts

List of miscellaneous parts.

Hardware Parts List

List of screws, nuts, and washers.

Packing & Accessories