How to troubleshoot absolute humidity sensor issues in a Sears 721.80803400?
A normal absolute humidity sensor should measure approximately 6.0 Kohms between the BK-RD terminals, 3.0 Kohms between the RD-WH terminals, and 3.0 Kohms between the BK-WH terminals. An abnormal sensor will show infinite resistance or approximately 0 ohm.
What are the normal resistance readings for the fan motor in a Sears Microwave Oven?
A normal fan motor should measure approximately 35 to 50 ohms between Terminal A and C, and 5 to 15 ohms between Terminal A and B. An abnormal fan motor will show infinite resistance or several ohms.
What is the normal resistance of the turntable motor in a Sears 721.80803400?
A normal turntable motor should measure approximately 2.0 to 3.0 Kohms. An abnormal motor will show infinite resistance or several ohms.
General| Brand | Sears |
|---|---|
| Model | 721.80803400 |
| Category | Microwave Oven |
| Language | English |
Safety guidelines for technicians during microwave oven servicing to avoid exposure to microwave energy.
Overview of the microwave oven's control panel and its main display and buttons.
Detailed electrical schematic diagram for the microwave oven's first section.
Detailed electrical schematic diagram for the microwave oven's second section.
Circuit diagram illustrating the matrix layout for the touch key board.
Guidelines for safe and effective operation of the microwave oven during general use.
Procedure for testing microwave oven functionality after installation or repair.
Overview of the microwave oven's key features and technical specifications.
Important notes and advice for servicing microwave ovens safely and effectively.
Procedure and equipment for testing microwave energy leakage from the oven.
Instructions for measuring microwave energy leakage and power output.
Step-by-step guide to safely remove the main circuit board assembly.
Instructions for safely removing and inserting FPC connectors on circuit boards.
Procedure for removing the outer casing of the microwave oven.
Steps to remove and service the door interlock switch mechanisms.
Detailed instructions for the careful removal of the magnetron component.
Procedures for removing the stirrer fan and disassembling the microwave oven door.
Instructions for assembling the door and removing the ventilation motor.
Procedures for removing the turntable motor and replacing the humidity sensor.
Explanation of the door lock mechanism and its role in microwave safety.
Steps to adjust door latches and interlock switches for proper operation.
Procedures to test the sequence of interlock switches upon door operation.
Final check for microwave energy leakage after servicing.
Testing the continuity of primary, secondary, and monitor interlock switches.
Detailed tests for various components like transformer, magnetron, capacitor, etc.
Troubleshooting common causes for fuse blowing in the microwave oven.
Procedures for checking fan motor and oven lamp operations related to relays.
Identifying potential circuit board failures based on specific operational symptoms.
Diagnosing problems related to display not showing time or incorrect numbers.
Troubleshooting issues where the unit does not start countdown or heat properly.
Diagnosing heating problems related to interlock switches and thermostats.
Troubleshooting problems with buzzer sounds and ventilation fan operation.
To Next Page