Sharp R-3A56 User Manual

R-3A56
SHARP CORPORATION
SERVICE MANUAL
In interests of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.
MODEL
R-3A56
S7403R3A56PJZ
MICROWAVE OVEN
TABLE OF CONTENTS
Page
CAUTION, MICROWAVE RADIATION ................................................................................................................ 1
WARNING ..............................................................................................................................................................1
PRODUCT SPECIFICATIONS............................................................................................................................. 2
GENERAL INFORMATION ................................................................................................................................... 2
APPEARANCE VIEW........................................................................................................................................... 3
OPERATION SEQUENCE ................................................................................................................................... 4
FUNCTION OF IMPORTANT COMPONENTS .................................................................................................... 5
SERVICING .......................................................................................................................................................... 7
TEST PROCEDURE ............................................................................................................................................ 9
TOUCH CONTROL PANEL ................................................................................................................................ 16
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ............................................................... 21
MICROWAVE MEASUREMENT ........................................................................................................................ 26
WIRING DIAGRAM ............................................................................................................................................. 27
PICTORIAL DIAGRAM....................................................................................................................................... 29
CONTROL PANEL CIRCUIT .............................................................................................................................. 31
PRINTED WIRING BOARD ................................................................................................................................ 32
PARTS LIST........................................................................................................................................................ 33

Sharp R-3A56 Specifications

General

Cooking Levels	10
Voltage	120V
Category	Microwave Oven
Wattage	1000 Watts
Power Output	1000 Watts

Summary

Function of Important Components

Door Mechanism and Switches

Explains door opening, latch, and monitor switches.

Safety and Protection Components

Details fuses, thermal cut-outs, and resistors.

Servicing and Troubleshooting

Service Personnel Safety

Critical safety warnings and precautions for technicians.

Troubleshooting Guide

A guide for diagnosing and resolving appliance issues.

Test Procedure

Component Testing Procedures

Detailed tests for magnetron, output power, transformer, and rectifiers.

Switch and Thermal Cut-out Tests

Other Component and Circuit Tests

Tests for monitor resistor, motors, fuse, and control panel.

Touch Control Panel Assembly

Control Panel Overview and LSI Description

Servicing (General Procedures)

Handling Electronic Components

Precautions for handling sensitive electronic parts like CMOS LSI.

Touch Control Panel Servicing

General Servicing Precautions

Component Replacement and Adjustment Procedure

External Component Removal

Internal Component Removal

Door Assembly Replacement and Adjustment

Microwave Measurement

Leakage Test Requirements and Preparation

Safety standards and steps for performing leakage tests.

Pictorial Diagram

Control Panel Circuit

Control Panel Circuit Diagram

Printed Wiring Board