How to troubleshoot absolute humidity sensor issues in a Sears 721.80802400?
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 721.80802400?
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 | 721.80802400 |
| Category | Microwave Oven |
| Language | English |
Guidelines to avoid exposure to microwave energy during servicing of the oven.
Detailed technical specifications including power, frequency, dimensions, and components.
Details the operational states of interlock switches under different conditions.
Critical warnings regarding high voltage and microwave radiation during repair.
Proper installation and grounding procedures for safe operation of the microwave oven.
Diagram and labeling of the microwave oven's control panel buttons and display.
Explanation of each control button and dial on the microwave oven's interface.
Schematic illustrating the main electrical connections and component interconnections.
Second schematic illustrating electrical pathways, including noise filter details.
Diagram showing the matrix circuit configuration for the touch key board.
Guidelines for safe use and overview of the oven's safety systems and power levels.
Critical warnings and tips to prevent high voltage and microwave leakage during service.
List of equipment and step-by-step instructions for measuring microwave radiation leakage.
Procedures for measuring leakage and calculating power output using water load.
Step-by-step guide to safely remove the main control circuit board from the oven.
Instructions for safely disconnecting and connecting FPC connectors to their terminal sockets.
Detailed steps to safely remove the external casing of the microwave oven.
Procedure for safely removing the door interlock switch components.
Step-by-step guide for carefully removing the magnetron component.
Procedures for removing the stirrer fan and disassembling the oven door.
Guidelines for door assembly and steps to remove the ventilation motor.
Procedures for removing the turntable motor and replacing the humidity sensor.
Procedure to check and adjust door latches and interlock switch alignment for proper closure.
Testing interlock switch sequences and final microwave energy leakage.
Procedures to test continuity of interlock switches using an ohmmeter.
Testing resistance of transformer windings and magnetron components.
Testing procedures for capacitors, diodes, relays, and fan motors.
Testing resistance values for various motors and the humidity sensor.
Measuring resistance of the touch key board terminals when touched and not touched.
Diagnosing common causes for fuse blowing and recommended troubleshooting actions.
Troubleshooting procedures for fan motor and oven lamp operation issues.
Symptoms that indicate a potentially defective main circuit board.
Troubleshooting steps for display errors, including no message or wrong indications.
Diagnosing issues where the unit does not start countdown or produce heat.
Troubleshooting steps for when high power cooking fails to generate heat.
Diagnosing problems with the buzzer not sounding or the ventilation fan not operating.
Diagram showing individual parts of the microwave oven door assembly.
Diagrams identifying parts for the controller unit specific to different models.
Illustration of various parts that constitute the oven cavity.
Diagram detailing the components of the latch board assembly.
Illustration of internal components, including turntable and motor assemblies.
Diagram of interior parts, focusing on motor and electronic components.
Diagram of interior parts, showing different sub-assemblies and connectors.
Diagram showing parts required for installation, including mounting hardware.
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