Sears 721.66292500 User Manual

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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

Questions and Answers:

E
ejohnsonJul 30, 2025
Why my Sears Microwave Oven isn't working and the display is blank?
- J
  James ManningJul 30, 2025
  If your Sears Microwave Oven isn't operating, the display window is blank, and no input is accepted, it could be due to: * A blown fuse. Replace the fuse, primary, monitor switches, and RELAY(RY2) of P.C.B Assembly. * A malfunction of the monitor switch. Replace the fuse, primary, monitor switches, and RELAY(RY2) of P.C.B Assembly. * A defective high voltage capacitor. Replace the high voltage capacitor. * A defective high voltage transformer. Replace the high voltage transformer.
C
cindydeleonAug 3, 2025
Sears 721.66292500 Microwave Oven: no microwave, but lamp and fan work. Why?
- C
  Christopher LeonardAug 4, 2025
  If your Sears Microwave Oven's lamp and fan are running, but there's no microwave oscillation, it could be due to: * A defective PCB assembly. Replace the PCB assembly. * A defective high voltage capacitor. Replace the high voltage capacitor. * A defective high voltage transformer. Replace the high voltage transformer. * A defective high voltage diode. Replace the high voltage diode. * A defective magnetron. Replace the magnetron.
C
christinafrancisAug 7, 2025
Why is my Sears 721.66292500 Microwave Oven running but not heating food properly?
- S
  sydneygreenAug 8, 2025
  If your Sears Microwave Oven seems to be operating but produces little heat, it may be due to: * Voltage lower than 90% of the output rating. Contact your local electric power utility company or a qualified electrician. * A defective PCB assembly. Replace the PCB assembly. * A defective magnetron. Replace the magnetron.
G
griffithteresaAug 12, 2025
Why does my Sears 721.66292500 spark inside?
- M
  Michelle NelsonAug 12, 2025
  Sparks in your Sears Microwave Oven can occur due to several reasons: * Using metallic ware or allowing it to touch the oven wall. Avoid metallic ware unless specifically allowed in the cooking guide. * Using ceramic ware trimmed with gold or silver powder. Do not use cookware with metallic trimming. * Uneven microwave cooking. Use plastic wrap or a lid. * Inconsistent microwave intensity. Stir foods like soup, cocoa, or milk once or twice during cooking.
M
martingaryAug 16, 2025
Why is my Sears 721.66292500's output power so low?
- A
  Adam MoonAug 16, 2025
  The output power of your Sears Microwave Oven might be low due to: * Low AC input voltage. Ensure the machine is used at an adequate line voltage. * Food temperature being too low. The food may need to be cooked for a longer time.
D
davidchenAug 20, 2025
What to do if my Sears Microwave Oven display is set but it won't start?
- L
  lgriffinAug 20, 2025
  If your Sears Microwave Oven display is set, but it won't start cooking when you press the START button, it could be due to: * The setting time not counting down when touching the START pad. Replace the secondary switch. * The fan motor or oven lamp not turning on. Replace the fan motor. * A defective oven lamp. Replace the oven lamp. * Unknown cause. Replace the PCB assembly.
J
Jessica MejiaAug 26, 2025
Why does my Sears 721.66292500 display a strange code and beep when toasting?
- J
  Jacqueline LongAug 26, 2025
  If your Sears Microwave Oven displays a strange code and beeps when toasting, it could be due to: * Shorted 2-wire leads. Replace PCB assembly or separate the 2-wire leads as far as possible and connect them tightly. * A defective thermistor. Replace the thermistor. * A defective heater assembly. Replace the toaster assembly. * Internal temperature exceeding 220 degrees Celsius. Allow the toaster to cool down; the fan will run automatically for 3 minutes.

Sears 721.66292500 Specifications

General

Category	Microwave Oven
Model Number	721.66292500
Power Output	1000 Watts
Cooking Levels	10
Child Safety Lock	Yes
Defrost Function	Yes
Timer	Yes

Summary

Microwave Safety Precautions

Exposure Avoidance

Precautions to avoid exposure to excessive microwave energy during servicing.

Adjustment Procedures

Door Latch and Switch Alignment

Safety Testing

Testing interlock switch sequence and microwave energy leakage.

Installation, Usage, and Trial Operation

Overall Circuit Diagram

Operating Procedures

Microwave Control Panel

Toaster Control Panel

Easy Use Guide

Microwave Energy Leakage Measurement

Cautions and Procedure

Safety precautions and step-by-step guide for measuring microwave radiation leakage.

Measurement Procedures and Notes

Oven Leakage, Measurement Notes, and Power Output

Procedures for measuring leakage, notes on accuracy, and power output measurement.

Disassembly Instructions

Outer Case and Toaster Assembly Removal

Door Assembly Removal

Component Removal

High Voltage and System Component Removal

Interlock Continuity Testing

Test Procedures

High Voltage Capacitor Testing

High Voltage Diode Testing

Motor and Relay Testing

Checkout Procedures: Fuse Blowing

Checkout Procedures: Relay Issues

Checkout Procedures: Circuit Board

Troubleshooting Guide

General Cautions for Troubleshooting

Trouble 1: Control Circuit Symptoms

Trouble 2: No Operation/Input

Trouble 3: Cooking Start Issues

Trouble 4: Low Heat Output

Trouble 5: No Microwave Oscillation

Trouble 6: Toaster Display Codes

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