How to troubleshoot absolute humidity sensor issues in a Sears 721.80809400?
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 721.80809400 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 Microwave Oven?
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 | 721.80809400 |
| Category | Microwave Oven |
| Language | English |
Safety guidelines regarding potential exposure to microwave energy during servicing.
Instructions and warnings for safe and correct placement and connection of the appliance.
Guidelines for ensuring proper electrical grounding for user safety.
Detailed explanation of each button and function on the microwave's control panel.
Electrical schematic illustrating the main components and their connections.
Second part of the electrical schematic, including wire color codes and connector details.
Diagram showing the matrix configuration of the touch key board for troubleshooting.
Important safety and operational advice for using the microwave oven.
Step-by-step procedure to test the microwave's functionality after installation or repair.
Overview of the microwave's safety systems and adjustable power output levels.
Essential safety warnings and practical advice for technicians performing repairs.
List of necessary tools and equipment for performing microwave leakage tests.
Procedures for measuring microwave radiation leakage according to safety standards.
Steps for checking microwave leakage with the oven's outer panels removed.
Procedures for checking microwave leakage on a completely assembled oven.
Method for measuring the microwave oven's power output using a water load.
Step-by-step guide for safely removing the main circuit board assembly.
Instructions for disassembling and removing the external casing of the microwave.
Procedure for accessing and removing the door interlock switch components.
Detailed steps for carefully removing the magnetron assembly.
Guide for removing the internal stirrer fan assembly.
Instructions for detaching the microwave oven door.
Steps for taking apart the microwave oven door components.
Guidelines for correctly reassembling and mounting the microwave door.
Procedure for removing the ventilation motor from the unit.
Steps for detaching the turntable motor assembly.
Instructions for removing and replacing the humidity sensor.
Steps for adjusting door latches and interlock switches to prevent microwave leakage.
Procedure to inspect door latch gaps and switch alignment.
Method for adjusting the latch board to ensure proper switch operation.
Verifying the correct sequential operation of interlock switches when the door is opened/closed.
Final check for microwave leakage after interlock system adjustments.
How to test the continuity of the primary interlock switch using an ohmmeter.
How to test the continuity of the secondary interlock switch using an ohmmeter.
How to test the continuity of the interlock monitor switch using an ohmmeter.
Resistance and continuity tests for components like transformer, magnetron, capacitor, etc.
Procedure for testing the resistance of the touch key board connector.
Diagnosing common causes for fuse blowing issues.
Troubleshooting steps for problems related to fan motor and oven lamp relays.
Identifying symptoms indicative of a defective main circuit board.
Troubleshooting steps when the 'SET TIME OF DAY' message persists.
Steps to resolve issues with incorrect numbers or indicators on the display.
Diagnosing why the countdown does not start after touching the START key.
Troubleshooting steps when the unit operates but produces no heat.
Identifying causes for no heating during high power cooking cycles.
Troubleshooting steps when the unit does not produce a buzzing sound.
Steps to diagnose why the ventilation fan does not operate.
Illustrated breakdown of all components related to the microwave door assembly.
Illustrated breakdown of components for the control panel and its housing.
Illustrated breakdown of components within the main oven cavity.
Illustrated breakdown of components making up the door latch board assembly.
Illustrated breakdown of various internal components (Part 1).
Illustrated breakdown of various internal components (Part 2 - I).
Illustrated breakdown of various internal components (Part 2 - II).
Illustrated breakdown of parts included for appliance installation.
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