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Sears 721.80403402 - User Manual

Sears 721.80403402
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DIVISION 22
BASIC FIELD MANUAL
FOR
MICROWAVE HOOD COMBINATION
MODEL 721.80402400 / 721.80402401 / 721.80402402
721.80409400 / 721.80409401 / 721.80409402
721.80404400 / 721.80404401 / 721.80404402
721.80403400 / 721.80403401 / 721.80403402
May, 2005
MODEL 721.80402
721.80409
721.80404
721.80403
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Summary

CAUTION AND WARNING TO SERVICE TECHNICIANS

PRECAUTIONS DURING SERVICING

Safety precautions for service technicians to prevent microwave energy exposure.

FOREWORD

SPECIFICATIONS

SWITCH CHART

Table detailing switch modes and conditions for interlock systems.

CAUTIONS

MICROWAVE RADIATION HAZARDS

Information regarding potential microwave radiation hazards during operation or servicing.

INSTALLATIONS

GROUNDING INSTRUCTIONS

Essential guidelines for properly grounding the appliance for user safety.

OPERATING INSTRUCTIONS

CONTROL PANEL OVERVIEW

Diagram showing the layout of the control panel buttons.

CONTROL PANEL FUNCTIONS

Detailed explanation of each button's function on the control panel.

SCHEMATIC DIAGRAMS

SCHEMATIC DIAGRAM (I)

Electrical schematic illustrating the unit's circuitry, part one.

SCHEMATIC DIAGRAM (II)

Electrical schematic illustrating the unit's circuitry, part two.

MATRIX CIRCUIT FOR TOUCH KEY BOARD

GENERAL INFORMATION FOR SERVICE

TRIAL OPERATION

Step-by-step procedure for testing the unit's functionality after installation.

SERVICE INFORMATION

PRECAUTIONS AND REPAIR SERVICE TIPS

Key safety warnings and advice for performing service and repairs on the unit.

MICROWAVE LEAKAGE TEST

MEASURING MICROWAVE ENERGY LEAKAGE

Procedure for measuring microwave radiation leakage using specialized equipment.

MEASUREMENT PROCEDURES

POWER OUTPUT MEASUREMENT

Method for measuring the microwave oven's power output using a water load.

DISASSEMBLY INSTRUCTIONS

REMOVING POWER AND CONTROL CIRCUIT BOARD

Step-by-step guide to safely remove the control panel and circuit board assembly.

FPC CONNECTOR PROCEDURES

HOW TO REMOVE THE F.P.C. CONNECTOR

Detailed steps for safely disconnecting the Flexible Printed Circuit (FPC) connector.

COMPONENT REMOVAL

REMOVING THE OUT CASE

Instructions for removing the outer casing of the microwave oven.

REMOVING THE DOOR INTERLOCK SWITCHES

Steps to remove the door interlock switches for inspection or replacement.

REMOVING MAGNETRON

Instructions for safely removing the magnetron assembly from the microwave oven.

DOOR AND VENTILATION FAN PROCEDURES

REMOVING DOOR

Steps to remove the microwave oven door assembly for servicing or replacement.

TURNTABLE MOTOR REMOVAL

INTERLOCK SYSTEM

ADJUSTMENT PROCEDURES

Steps to adjust door latches and interlock switches for proper safety operation.

LATCH AND SWITCH TESTING

TEST THE LATCH AND SWITCH SEQUENCE

Procedure to verify the correct sequence of interlock switches when the door operates.

INTERLOCK CONTINUITY TEST

PRIMARY INTERLOCK SWITCH TEST

Testing the continuity of the primary interlock switch for proper function.

COMPONENT TESTING

TRANSFORMER TESTING

Procedures to test the resistance and continuity of the high voltage transformer.

MAGNETRON TESTING

Testing procedures for the magnetron component's resistance and condition.

CAPACITOR TESTING

MOTOR TESTING

VENTILATION MOTOR TESTING

Procedures for testing the resistance of the ventilation motor.

TROUBLESHOOTING - FUSE BLOWING

CHECKOUT PROCEDURES FOR FUSE BLOWING

Troubleshooting steps for identifying causes of fuse blowing in the microwave.

TROUBLESHOOTING - DISPLAY ISSUES

PROBLEM - A: DISPLAY ISSUES

Diagnosing and resolving problems related to the display not showing correct information.

TROUBLESHOOTING - HEATING ISSUES

PROBLEM - E: UNIT DOES NOT HEAT UP

Steps to diagnose why the microwave oven fails to heat food when operated.

TROUBLESHOOTING - FAN ISSUES

PROBLEM - VENTILATION FAN DOES NOT OPERATE

Steps to diagnose why the ventilation fan fails to operate when the key is touched.

DOOR PARTS(II)

OVEN CAVITY PARTS

INSTALLATION PARTS

Summary

CAUTION AND WARNING TO SERVICE TECHNICIANS

PRECAUTIONS DURING SERVICING

Safety precautions for service technicians to prevent microwave energy exposure.

FOREWORD

SPECIFICATIONS

SWITCH CHART

Table detailing switch modes and conditions for interlock systems.

CAUTIONS

MICROWAVE RADIATION HAZARDS

Information regarding potential microwave radiation hazards during operation or servicing.

INSTALLATIONS

GROUNDING INSTRUCTIONS

Essential guidelines for properly grounding the appliance for user safety.

OPERATING INSTRUCTIONS

CONTROL PANEL OVERVIEW

Diagram showing the layout of the control panel buttons.

CONTROL PANEL FUNCTIONS

Detailed explanation of each button's function on the control panel.

SCHEMATIC DIAGRAMS

SCHEMATIC DIAGRAM (I)

Electrical schematic illustrating the unit's circuitry, part one.

SCHEMATIC DIAGRAM (II)

Electrical schematic illustrating the unit's circuitry, part two.

MATRIX CIRCUIT FOR TOUCH KEY BOARD

GENERAL INFORMATION FOR SERVICE

TRIAL OPERATION

Step-by-step procedure for testing the unit's functionality after installation.

SERVICE INFORMATION

PRECAUTIONS AND REPAIR SERVICE TIPS

Key safety warnings and advice for performing service and repairs on the unit.

MICROWAVE LEAKAGE TEST

MEASURING MICROWAVE ENERGY LEAKAGE

Procedure for measuring microwave radiation leakage using specialized equipment.

MEASUREMENT PROCEDURES

POWER OUTPUT MEASUREMENT

Method for measuring the microwave oven's power output using a water load.

DISASSEMBLY INSTRUCTIONS

REMOVING POWER AND CONTROL CIRCUIT BOARD

Step-by-step guide to safely remove the control panel and circuit board assembly.

FPC CONNECTOR PROCEDURES

HOW TO REMOVE THE F.P.C. CONNECTOR

Detailed steps for safely disconnecting the Flexible Printed Circuit (FPC) connector.

COMPONENT REMOVAL

REMOVING THE OUT CASE

Instructions for removing the outer casing of the microwave oven.

REMOVING THE DOOR INTERLOCK SWITCHES

Steps to remove the door interlock switches for inspection or replacement.

REMOVING MAGNETRON

Instructions for safely removing the magnetron assembly from the microwave oven.

DOOR AND VENTILATION FAN PROCEDURES

REMOVING DOOR

Steps to remove the microwave oven door assembly for servicing or replacement.

TURNTABLE MOTOR REMOVAL

INTERLOCK SYSTEM

ADJUSTMENT PROCEDURES

Steps to adjust door latches and interlock switches for proper safety operation.

LATCH AND SWITCH TESTING

TEST THE LATCH AND SWITCH SEQUENCE

Procedure to verify the correct sequence of interlock switches when the door operates.

INTERLOCK CONTINUITY TEST

PRIMARY INTERLOCK SWITCH TEST

Testing the continuity of the primary interlock switch for proper function.

COMPONENT TESTING

TRANSFORMER TESTING

Procedures to test the resistance and continuity of the high voltage transformer.

MAGNETRON TESTING

Testing procedures for the magnetron component's resistance and condition.

CAPACITOR TESTING

MOTOR TESTING

VENTILATION MOTOR TESTING

Procedures for testing the resistance of the ventilation motor.

TROUBLESHOOTING - FUSE BLOWING

CHECKOUT PROCEDURES FOR FUSE BLOWING

Troubleshooting steps for identifying causes of fuse blowing in the microwave.

TROUBLESHOOTING - DISPLAY ISSUES

PROBLEM - A: DISPLAY ISSUES

Diagnosing and resolving problems related to the display not showing correct information.

TROUBLESHOOTING - HEATING ISSUES

PROBLEM - E: UNIT DOES NOT HEAT UP

Steps to diagnose why the microwave oven fails to heat food when operated.

TROUBLESHOOTING - FAN ISSUES

PROBLEM - VENTILATION FAN DOES NOT OPERATE

Steps to diagnose why the ventilation fan fails to operate when the key is touched.

DOOR PARTS(II)

OVEN CAVITY PARTS

INSTALLATION PARTS

Sears 721.80403402 Specifications

General IconGeneral
BrandSears
Model721.80403402
CategoryMicrowave Oven
LanguageEnglish

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