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Sears 721.88512900 User Manual

Sears 721.88512900
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DIVISION 22
BASIC FIELD MANUAL
FOR
MICROWAVE HOOD COMBINATION
MODEL
721.88512900
721.88513900
721.88519900
January, 2009
MODEL 721.88512
721.88513
721.88519
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Sears 721.88512900 Specifications

General IconGeneral
Cooking Levels10
ColorWhite
Sensor CookingYes
Child LockYes
Defrost FunctionYes
Keep Warm FunctionNo
Auto MenuYes
Display TypeLED
Voltage120V
Frequency60Hz
Wattage1000 watts
Power Output1000 watts
Control TypeElectronic

Summary

CAUTION AND SERVICE PRECAUTIONS

MICROWAVE ENERGY EXPOSURE SAFETY

Safety measures to prevent exposure to excessive microwave energy during servicing.

FOREWORD

SPECIFICATIONS

SWITCH CHART DETAILS

Table detailing the operation of interlock switches based on door status.

GENERAL CAUTIONS AND RADIATION SAFETY

INSTALLATION GUIDELINES

PRECAUTIONS AND GROUNDING INSTRUCTIONS

Procedures for safe installation, including power supply and grounding requirements.

OPERATING INSTRUCTIONS

CONTROL PANEL LAYOUT DIAGRAM

Visual representation of the microwave oven's control panel buttons.

CONTROL PANEL FUNCTION DESCRIPTIONS

CIRCUIT DIAGRAMS

OVERALL AND SCHEMATIC ELECTRICAL DIAGRAMS

Diagrams illustrating the microwave oven's electrical connections and components.

TOUCH KEY BOARD MATRIX CIRCUIT

GENERAL SERVICE INFORMATION

TRIAL OPERATION AND FEATURES

Guidance on initial operation checks and key features of the appliance.

SERVICE INFORMATION AND REPAIR TIPS

PRECAUTIONS AND REPAIR SERVICE TIPS

Essential precautions and advice for performing service and repairs.

MICROWAVE LEAKAGE TESTING

MEASURING MICROWAVE ENERGY LEAKAGE

Procedures and equipment for measuring microwave radiation leakage.

MEASUREMENT PROCEDURES

OUTER CASE MEASUREMENTS

Leakage measurement procedures with the outer case removed and assembled.

POWER OUTPUT MEASUREMENT

Method for measuring the microwave oven's power output.

RECORD KEEPING AND NOTIFICATION

Guidelines for documenting service results and notifying relevant parties.

DISASSEMBLY INSTRUCTIONS

CIRCUIT BOARD REMOVAL PROCEDURES

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

FPC CONNECTOR HANDLING

REMOVING THE OUTER CASE

REMOVING DOOR INTERLOCK SWITCHES

REMOVING THE MAGNETRON

COMPONENT REMOVAL: STIRRER FAN

COMPONENT REMOVAL: DOOR

DISASSEMBLING THE DOOR

ASSEMBLING THE DOOR

REMOVING THE VENTILATION MOTOR

REPLACING THE HUMIDITY SENSOR

REMOVING THE TURNTABLE MOTOR

REMOVING CONVECTION HEATER AND THERMISTOR

INTERLOCK SYSTEM ADJUSTMENT

LATCH AND SWITCH CLOSING PROCEDURES

Steps to adjust door latches and interlock switches for proper function.

LATCH AND SWITCH SEQUENCE TESTING

MICROWAVE ENERGY LEAKAGE TESTING

INTERLOCK CONTINUITY TESTING

SWITCH CONTINUITY TEST PROCEDURES

Methods to check continuity of primary, secondary, and monitor interlock switches.

TEST AND CHECKOUT PROCEDURES

TRANSFORMER AND MAGNETRON COMPONENT TESTS

Procedures for testing resistance of the transformer and magnetron.

HV CAPACITOR TESTING

HV DIODE TESTING

RELAY AND MOTOR TESTING

TOUCH KEY BOARD TESTING

TROUBLESHOOTING: FUSE BLOWING

TROUBLESHOOTING: FAN MOTOR AND OVEN LAMP

TROUBLESHOOTING: CIRCUIT BOARD FAULTS

TROUBLESHOOTING COMMON ISSUES

OVEN OPERATION, OUTPUT, SPARKS, AND COOKING

Addressing common problems like oven not working, low power, sparks, and uneven cooking.

TROUBLESHOOTING CONTROL CIRCUIT SYMPTOMS

TROUBLESHOOTING: OVEN NOT OPERATING

TROUBLESHOOTING: OVEN NOT STARTING

TROUBLESHOOTING: NO MICROWAVE OSCILLATION

TROUBLESHOOTING: CONVECTION OVEN PROBLEMS

EXPLODED VIEW: DOOR PARTS

EXPLODED VIEW: CONTROLLER PARTS

EXPLODED VIEW: OVEN CAVITY PARTS

EXPLODED VIEW: LATCH BOARD PARTS

EXPLODED VIEW: INTERIOR PARTS (I)

EXPLODED VIEW: INTERIOR PARTS (II)

EXPLODED VIEW: INSTALLATION PARTS

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