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INTRODUCTION

This Microwave Oven Service Manual is printed in a loose-leaf format. Each part is divided into sections relating

to a general group of components and each section is subdivided into various parts describing a particular

component or service procedure.

The subdividing of the subject matter plus the loose leaf form will facilitate the updating of the manual as new or

revised components and service procedures are introduced.

Each page of this service manual will be identified in the lower right hand corner and, as new or revised pages

are published, it will be easy to keep the manual up to date by following the filing instructions on the cover letter.

This Service Manual is a valuable service tool and care should be taken to keep it up to date by prompt and

proper filling of subsequent pages as they are issued.

CONTENTS

SAFETY PRECAUTIONS ..........................................................................................................................................1

1 THE HEATING PRINCIPLE OF MICROWAVE ..................................................................................................2

2 THE STRUCTURE AND WORKING PRINCIPLE OF MICROWWAVE OVEN. ................................................ 3

2.1HIGH VOLTAGE RECTIFYING CIRCUIT. ..........................................................................................3

2.2MICROWAVE GENERATER. ..............................................................................................................4

2.3COOLING SYSTEM ............................................................................................................................4

2.4ELECTRIC CONTROL SYSTEM. .......................................................................................................4

3 TYPICAL CIRCUIT ANALYASIS OF MICROWAVE OVEN ................................................................................7

4 HOW TO ASSEMBLE AND DISASSEMBLE MICROWAVE OVEN COMPONENTS ........................................8

4.1THE CABINET ....................................................................................................................................8

THE DOOR COMBINATION ..............................................................................................................................9

4.3THE CONTROL PANEL AND THE DOOR RELEASE MECHANISM. ............................................. 10

4.4THE MAGNETRON. ......................................................................................................................... 10

4.5THE TRANSFORMER. .....................................................................................................................11

4.6THE FAN MOTOR. ........................................................................................................................... 11

4.7THE CAPACITOR. ............................................................................................................................12

4.8THE DIODE. ..................................................................................................................................... 12

4.9THE TURNTABLE COMBINATIOM. ................................................................................................. 13

4.10THE DOOR SAFTY INTERLOCKS. ................................................................................................. 13

THE CONTROL PANEL OF A TYPICAL MICROWAVE OVEN........................................................................ 14

5 BREAKDOWN ANALYSIS AND THE MEANS OF OVERHAULING ............................................................... 15

5.1EXAMINING THE BREAKDOWN CAUSES. ....................................................................................15

SPOT EXAMINING STEPS OF THE MICROWAVE OVEN............................................................................. 15

5.3REPAIRING METHOD OF SEVERAL BREAKDOWN ..................................................................... 18

5.4THE CHARACTERS REQUIREMENTS OF MICROWAVE AFTER IT HAS BEEN REPAIRED ......19

6 CRITICAL PARTS SERVICING ....................................................................................................................... 20

6.1IMPORTANT THINGS TO DO PRIOR TO CRITICAL PARTS SERVICING: ....................................20

6.2Interlock Assembly Replacement and Adjustment. ...........................................................................20

7 COMMON BREAKDOWN OF MICROWAVE OVEN AND MEANS OF REPAIRING ......................................21

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Categorie:	Magnetron
Model:	PM70710

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