How to troubleshoot absolute humidity sensor issues in a Sears 721.80803401 Microwave Oven?
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 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 | 721.80803401 |
| Category | Microwave Oven |
| Language | English |
Details the states of interlock switches under different conditions.
Warns about exposure to microwave energy during servicing.
Instructions for safe and proper placement and connection of the unit.
Guidelines for electrical grounding for user safety.
Overview of the microwave oven's control panel layout and functions.
Detailed explanation of each button and display on the control panel.
Electrical schematic diagram for the microwave oven's primary circuits.
Secondary electrical schematic diagram for the microwave oven.
Diagram showing the matrix circuit for the touch key board.
General precautions and information for servicing the microwave oven.
Precautions, tips, and general information for service technicians.
Important safety warnings and procedures for microwave leakage testing.
List of necessary equipment for performing microwave leakage tests.
Step-by-step guide on how to measure microwave energy leakage.
Leakage measurement steps with the outer panels removed.
Leakage measurement steps with the oven fully assembled.
Procedure for measuring the microwave oven's power output.
Guidelines for documenting and reporting measurement results.
Critical safety and procedural notes before starting disassembly.
Step-by-step guide to remove the main circuit board assembly.
Instructions for safely removing and inserting FPC connectors.
Procedure for removing the external casing of the microwave oven.
Guide for accessing and removing the door interlock switch mechanisms.
Detailed steps for safely removing the magnetron component.
Instructions for removing the internal stirrer fan assembly.
Steps to remove the microwave oven door.
Guide on how to take apart the microwave oven door.
Procedures for correctly reassembling the microwave oven door.
Steps to remove the ventilation fan motor from the unit.
Instructions for removing the turntable motor assembly.
Guide for replacing the humidity sensor component.
Explanation of the door lock mechanism's function and design.
Steps to adjust door latches and interlock switches for proper operation.
Procedure to verify the alignment of door latches and switches.
Method for adjusting the latch board to ensure correct switch operation.
Verifying the correct operational sequence of interlock switches.
Final check of microwave energy leakage after adjustments.
Procedure to test the continuity of the primary interlock switch.
Procedure to test the continuity of the secondary interlock switch.
Procedure to test the continuity of the interlock monitor switch.
Safety warnings and precautions before performing tests.
Detailed tests for transformer, magnetron, capacitor, diode, relays, and motors.
Procedure to measure resistance of the touch key board connector pins.
Identifies causes and solutions for blown fuses.
Troubleshooting steps for fan motor and oven lamp relay issues.
Symptoms indicating a defective circuit board and checks to perform.
Steps to diagnose and resolve issues related to the display not showing time.
Steps to diagnose why the countdown does not start when the START key is pressed.
Diagnosing issues when the unit operates but does not produce heat.
Steps to diagnose why the unit does not heat at high power settings.
Diagnosing issues with the buzzer not sounding or sounding continuously.
Steps to diagnose why the ventilation fan does not operate.
Diagram showing the assembly of the microwave oven door components.
Diagram showing the assembly of the microwave oven controller components.
Diagram showing the assembly of the microwave oven cavity components.
Diagram showing the assembly of the latch board components.
Diagram showing internal components of the microwave oven (Part I).
Diagram showing internal components of the microwave oven (Part II - I).
Diagram showing internal components of the microwave oven (Part II - II).
Diagram showing components related to the installation of the microwave oven.
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