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FOREWORD

Read this Manual carefully. Failure to adhere to or observe the information in this Manual may result in exposing yourself to
the Microwave Energy normally contained within the oven cavity.

MODEL 721.66292

721.66299
721.66293

MECHANICAL SERVICE INFORMATION

TABLE OF CONTENTS

1. Adjustment Procedures .....................................................................................................................................3

2. Precautions on Installation ................................................................................................................................5

3. General Precautions in Use ..............................................................................................................................5

4. Trial Operation ..................................................................................................................................................5

5. Features and Specifications ..............................................................................................................................6-7

6. Overall Circuit Diagram .....................................................................................................................................8-9

7. Operating Procedures .......................................................................................................................................10-11

8. Procedure for Measuring Microwave Energy Leakage .....................................................................................12-13

9. Disassembly Instructions ..................................................................................................................................14-17

10. Interlock Continuity Test .................................................................................................................................18

11. Test and Checkout Procedures, and Troubleshooting

A. Test Procedures .........................................................................................................................................19-22

B. Checkout Procedures .................................................................................................................................23-25

C. Troubleshooting ..........................................................................................................................................26-31

12. Exploded View ................................................................................................................................................32-38

13. Part Reference list ..........................................................................................................................................39

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Содержание 721.66292500

Страница 1: ...DIVISION 20 BASIC FIELD MANUAL FOR TOASTER AND MICROWAVE OVEN MODEL 721 66292500 721 66299500 721 66293500 July 2005 MODEL 721 66292 721 66299 721 66293...

Страница 2: ...or proper alignment integrity and connections d Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired adjusted...

Страница 3: ...ent Procedures 3 2 Precautions on Installation 5 3 General Precautions in Use 5 4 Trial Operation 5 5 Features and Specifications 6 7 6 Overall Circuit Diagram 8 9 7 Operating Procedures 10 11 8 Proce...

Страница 4: ...o step 3 and follow all steps in order ADJUST THE LATCH AND SWITCH CLOSING 3 Loosen the two screws holding the plastic latch board as shown 4 With the oven door closed tightly move the latch board upw...

Страница 5: ...4 LATCH LATCH BOARD 0 1 64 0 1 64 Latch Board Secondary Interlock Switch A Interlock Monitor Switch Primary Interlock Switch...

Страница 6: ...s in the display window D Touch the START key Make sure the cavity light comes on The unit will begin cooking and the display window will show the time counting down by seconds E After about 5 minutes...

Страница 7: ...l readout And MWO mode and Toaster mode can be displayed to avoid confusion D Three different cooking stages can be set The oven remembers three cooking stages and changes from one cooking stage to an...

Страница 8: ...ty Devices Microwave oven Thermostat Open at 90 C 5 C Close at 75 C 5 C Fuse 20A Primary Interlock Switch Secondary Interlock Switch Interlock Monitor Toaster Toaster Door Switch Thermostat Open at 14...

Страница 9: ...6 OVERALL CIRCUIT DIAGRAM A SCHEMATIC DIAGRAM 8...

Страница 10: ...9 B MATRIX CIRCUIT FOR TOUCH KEY BOARD...

Страница 11: ...frozen foods 8 OPTION Touch this pad to change the oven s default settings for sound clock scroll speed and Lbs Kg 9 KITCHEN TIMER Touch this pad to use your microwave oven as a kitchen timer 10 COOK...

Страница 12: ...of your food in decimal increments from 0 1 to 6 0 pounds 4 Touch START 5 At beeping turn food over by following the instructions in the manual 6 After turning food over touch START to resume defrost...

Страница 13: ...1mW cm2 sq And always start measuring of an unknown field to assure safety for operating personnel from radiation leakage NOTE The standard is 5mW cm2 sq while in the customer s home 1mW cm2 sq stated...

Страница 14: ...information on the service invoice 2 Should the microwave energy leakage not be more than 1mW cm2 sq after determining that all parts are in good condition functioning properly and genuine replacement...

Страница 15: ...RCUIT A REMOVING OUT CASE Figures 7 1 Remove four screws from the rear section 2 Remove one screw from the side section 3 Push the outer case back about 1 inch 3cm 4 Lift the case from the set B REMOV...

Страница 16: ...itor switch and secondary switch operate normally 2 After replacing the door check for microwave energy leakage with a survey meter Microwave energy must be below the limit of 5 mW cm2 sq with a 275 m...

Страница 17: ...gnetron To prevent microwave leakage tighten the mounting screws properly making sure there is no gap between the waveguide and the magnetron E REMOVING THE TURNTABLE MOTOR Figure 11 1 Remove the turn...

Страница 18: ...uide H V Capacitor H V Diode H V Transformer I INTERLOCK SYSTEM 1 INTERLOCK MECHANISM The door lock mechanism is a device which has been specially designed to eliminate completely microwave activity w...

Страница 19: ...O SZM V 16 FA 63 OR VP 533A OF FOR SECONDARY SWITCH B SECONDARY INTERLOCK SWITCH TEST Disconnect the wire lead from the secondary switch Connect the ohmmeter leads to the common COM and normally open...

Страница 20: ...VOLTAGE TRANSFORMER Wire leads removed MAGNETRON Wire leads removed 1 Measure the resistance Select the ohm scale on the meter Primary winding Secondary winding Filament winding 2 Measure the resista...

Страница 21: ...meter 3 Using the meter battery and jump wire connect the items as illustrated in figures Terminal to terminal 1 Check DC 9V battery before performing tests 2 Select the DCV scale on the meter 3 Using...

Страница 22: ...ed in Figure 14 b This has the positive side of the battery connected to the cathode of the diode 3 The diode should be forward biased therefore a voltage reading of approximately 4 7 VDC to 6 4 VDC w...

Страница 23: ...E IN THE CORRECT POSITION WHEN REMOVING THE WIRE LEADS FROM THE PARTS BE SURE TO GRASP THE CONNECTOR NOT THE WIRES 1 Remove wire leads 2 Measure resistance Normal A Approximately 95 120 ohms B Approxi...

Страница 24: ...1 ADJUSTMENT PROCEDURES on page 3 when the primary interlock secondary interlock switches and or the interlock monitor switches are adjusted or replaced PROBLEMS CAUSES Fuse blows immediately after th...

Страница 25: ...e the micro switches Defective RELAY or poor connection of relay Replace RELAY or correct the connection YES NO NO YES GOOD PROBLEM A FAN motor and indicator light turn on without touching START key w...

Страница 26: ...ormal relay continuously operates 3 The buzzer does not sound or continues to sound NOTE A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON 4 Some segmen...

Страница 27: ...ing on this panel to discharge any static charge built up in your body Micom model only 26 CONDITION Toaster and Microwave oven does not work Inserting many plugs into one outlet and using them at the...

Страница 28: ...me while counting down 9 Display counts down too fast while cooking 10 Each indicator light does not turn on after setting cooking cycle 11 Display time of day does not reappear when cooking is finish...

Страница 29: ...continuity Normal Defective high voltage capacitor Replace high voltage capacitor Fuse blows again Defective high volt age transformer Replace high volt age transformer Malfunction of the monitor swit...

Страница 30: ...Replace oven lamp Loose connection Connect them tightly CONDITION CHECK RESULT CAUSE REMEDY Output is low Lower than 90 of rating voltage Normal Normal Abnormal Abnormal Measure the output power Disco...

Страница 31: ...capacitor Replace high voltage capacitor Check high vol tage capacitor Abnormal Defective magnetron Replace magnetron Check magnetron TROUBLE 5 No microwave oscillation even though oven lamp and fan m...

Страница 32: ...ntinuity No continuity Defective heater Defective PCB assembly 2 F 2 code Attached Seperated 2 wire leads are shorted contact Apart 2 wire leads as far as possible Check the CN3 connector whether 2 wi...

Страница 33: ...32 EV EXPLODED VIEW INTRODUCTION Model 721 66292500 721 66299500 721 66293500 DOOR PARTS LATCH BOARD PARTS TOASTER PARTS INTERIOR PARTS BASE PLATE PARTS OVEN CAVITY PARTS SENSOR PARTS...

Страница 34: ...33 DOOR PARTS 1002 1004 1000 1005 1008 1007 1006 1013 2009 W136 1381 W109 2000 1009 1003 For Model 721 66299 721 66292 For Model 721 66299 721 66292 EV...

Страница 35: ...34 OVEN CAVITY PARTS 3001 3003 3034 3009 W105 3008 3002 W118 W107 W103 For Model 721 66292 For Model 721 66299 721 66293 EV...

Страница 36: ...35 LATCH BOARD PARTS W102 5015 5006 4002 4003 4002 4004 4000 EV...

Страница 37: ...36 INTERIOR PARTS 5014 5016 W101 5010 W109 2006 W208 5007 5003 5041 5012 5019 W110 W208 5018 W109 5002 5000 3006 3007 W101 5009 5001 EV...

Страница 38: ...37 BASE PLATE PARTS 6000 6012 W108 6002 W109 W108 W101 6001 5008 EV...

Страница 39: ...38 TOASTER PARTS 7029 7024 7028 7040 7010 7382 7026 7381 7039 7038 7000 7008 7009 7383 7036 7011 7027 For Model 721 66293 For Model 721 66293 EV...

Страница 40: ...P NO 3828W5S5272 Printed in Korea...

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