How to troubleshoot sensor issues in Sears Microwave Oven?
To troubleshoot sensor issues in your Sears Microwave Oven, measure the resistance terminal to terminal using an ohm meter (scale: R X 1000). Normal readings should be approximately: BK - RD: 5.2 Kohm, RD - WH: 2.1 Kohm, BK - WH: 2.1 Kohm. Abnormal readings would be infinite or several ohms.
How to check turntable motor in Sears 721.66339 Microwave Oven?
To troubleshoot the turntable motor of your Sears Microwave Oven, measure the resistance using an ohm meter (scale: R x 1). A normal reading should be approximately 100~150 ohms. If the reading is infinite or several ohms, there is an issue.
How to check fan motor in Sears Microwave Oven?
To troubleshoot the fan motor in your Sears Microwave Oven, measure the resistance using an ohm-meter (scale: R x 1). Normal readings should be approximately: A: 85 ~ 100 ohm, B: 10 ~ 25 ohm. If the reading is infinite or several ohms, it indicates a problem.
General| Category | Microwave Oven |
|---|---|
| Model Number | 721.66339 |
| Power | 1000 Watts |
| Child Lock | Yes |
| Display | LED |
| Cooking Modes | Defrost, Reheat, Popcorn, Potato |
Safety precautions for servicing to avoid microwave energy exposure.
Checks door latch and switch closing for proper alignment and gaps.
Adjusts latch board for proper alignment and gap closure.
Tests primary, secondary, and monitor interlock switch sequence.
Measures microwave energy leakage using a survey meter after adjustments.
Details switch modes and continuity results for door open/closed states.
Presents the overall schematic diagram of the microwave oven's electrical system.
Displays the matrix circuit layout for the microwave's touch control keyboard.
Explains layout and function of each key and display element on the control panel.
Provides a simplified table for easy operation of various microwave functions.
Safety warnings and considerations before and during microwave energy leakage measurement.
Step-by-step guide for measuring microwave energy leakage using equipment.
Specific procedures for measuring leakage with the oven's outer case removed.
Instructions for measuring microwave leakage on a fully assembled oven.
Important notes and tips for accurate microwave leakage measurement.
Guidelines for recording and reporting microwave leakage test results.
Procedure to measure microwave oven's power output using a water load.
Step-by-step guide to remove the outer case of the microwave oven.
Instructions for removing the power and control circuit boards.
Procedure for disassembling or removing the microwave oven door.
Detailed steps for safely removing the magnetron assembly.
Instructions on how to remove the turntable motor and its components.
Steps to remove the high voltage transformer, including capacitor discharge.
Guide for removing the fan motor assembly and related components.
Procedure for removing the high voltage capacitor and diode.
Instructions for removing the sensor components from the oven.
Explanation of the door lock mechanism preventing microwave activity when the door is open.
Procedure for mounting interlock switches onto the latch board.
Steps for installing and adjusting the latch board assembly.
Tests continuity of the primary interlock switch for proper operation.
Tests continuity of the secondary interlock switch for proper operation.
Tests continuity of the monitor switch for proper operation.
Procedures for testing various components like transformers and magnetrons.
Procedures for troubleshooting common issues like fuse blowing.
Troubleshooting steps for problems related to fuse blowing.
Troubleshooting steps for issues related to oven relays.
Symptoms indicating a defective circuit board and troubleshooting steps.
General troubleshooting guide for common microwave oven problems.
Identifies visual symptoms suggesting a faulty control circuit board.
Troubleshooting steps when the oven is completely unresponsive.
Diagnosing why the oven fails to start cooking after settings are entered.
Troubleshooting low heat output during oven operation.
Diagnosing lack of microwave oscillation when other components are running.
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