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Sears 721.80402402 User Manual

Sears 721.80402402
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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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Sears 721.80402402 Specifications

General IconGeneral
Model Number721.80402402
CategoryMicrowave Oven
Power Output1000 Watts
Child Safety LockYes
Warranty1 year limited

Summary

Safety Precautions for Servicing

Microwave Energy Exposure Avoidance

Guidelines to prevent exposure to excessive microwave energy during servicing.

Foreword

Specifications

General Cautions

Microwave Radiation Warnings

Warnings about potential microwave radiation exposure and handling.

Installation Instructions

Grounding Safety

Essential grounding procedures for safe appliance installation and operation.

Operating Instructions

Control Panel Overview

Description and labeling of the microwave control panel buttons and display.

Control Panel Instructions

Circuit Diagrams

Overall Circuit Diagram

Schematic representation of the overall electrical system of the microwave.

Schematic Diagram (I)

First part of the detailed schematic diagram for the microwave.

Schematic Diagram (II)

Touch Key Board Matrix

General Information for Service

General Precautions in Use

Important safety and operational guidelines for using the microwave oven.

Trial Operation Procedure

Steps for testing the microwave after installation or repair.

Features and Specifications

Overview of the microwave's key features and technical specifications.

Service Information

Precautions and Repair Tips

Essential precautions and tips for performing service and repairs on the unit.

Microwave Leakage Test

Leakage Test Cautions

Critical cautions to observe before and during microwave leakage testing.

Measuring Microwave Energy Leakage

Procedure for measuring microwave radiation leakage from the oven.

Leakage Measurement Procedures

Measurement With Outer Case Removed

Steps for measuring microwave leakage with the outer casing detached.

Measurement With Fully Assembled Oven

Steps for measuring microwave leakage on a complete, assembled oven.

Power Output Measurement

Procedure for measuring the microwave oven's power output.

Disassembly Instructions

Removing Power and Control Circuit Board

Step-by-step guide for removing the power and control circuit board assembly.

FPC Connector Procedures

Removing the FPC Connector

Detailed steps for safely disconnecting the FPC connector.

Inserting the FPC Connector

Detailed steps for safely reconnecting the FPC connector.

Removing the Outer Case

Removing Door Interlock Switches

Removing Magnetron

Removing Stirrer Fan

Removing and Assembling Door

Removing the Door

Steps for detaching the microwave door assembly.

Disassembling the Door

Procedure for taking apart the microwave door components.

Assembling the Door

Steps for reattaching and adjusting the microwave door assembly.

Removing Ventilation Fan Assembly

Removing Turntable Motor

Interlock System

Adjustment Procedures

Steps for adjusting door latches and interlock switches for safety.

Checking Door Latch and Switch Closing

Procedure to verify proper alignment of door latches and switches.

Latch and Switch Testing

Test Latch and Switch Sequence

Verifying the correct sequence of interlock switch operations.

Microwave Energy Leakage Testing

Interlock Continuity Test

Primary Interlock Switch Test

Testing the continuity of the primary interlock switch.

Secondary Interlock Switch Test

Testing the continuity of the secondary interlock switch.

Monitor Switch Test

Testing the continuity of the interlock monitor switch.

Test and Checkout Procedures

Component Test Procedures

Procedures for testing various components like transformer and magnetron.

Capacitor, Diode, and Relay Tests

Fan Motor Test

Ventilation, Turntable, and Stirrer Motor Tests

Touch Key Board Test

Checkout Procedures

Fuse Blowing Checkout

Troubleshooting common issues related to fuse blowing.

Relay Checkout Procedures

Circuit Board Checkout

Trouble Shooting

Display and Input Problems

Troubleshooting display errors and input issues.

Interlock, Thermostat, and HV Component Issues

Buzzer Operation Problems

Ventilation Fan Operation Problems

Door Parts (II)

Controller Parts (II)

Oven Cavity Parts

Latch Board Parts

Interior Parts (I)

Interior Parts (II - I)

Installation Parts

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