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General| Brand | Sears |
|---|---|
| Model | 721.80403400 |
| Category | Microwave Oven |
| Language | English |
Covers safety measures and grounding requirements for proper unit installation.
Visual guide and detailed explanation of control panel buttons and display.
Detailed electrical schematics for the microwave oven's circuitry.
Diagram illustrating the matrix circuit for the touch-sensitive control keys.
Guidelines for safe servicing, including initial setup and testing procedures.
Essential advice and safety measures for performing repairs on the unit.
Methods for measuring microwave leakage, required equipment, and precautions.
Step-by-step guide to safely remove the main control circuit board assembly.
Instructions for safely detaching the outer casing of the microwave oven.
Procedure for removing and replacing the safety interlock switches.
Steps to remove the magnetron and stirrer fan assembly.
Procedures for removing the oven door and disassembling its components.
Guide for removing the oven's ventilation fan assembly.
Instructions for removing the turntable motor from the oven base.
Details on adjusting door latches and checking interlock switch sequences.
Procedures for testing the correct sequence of door interlock switches.
Procedures for testing transformer and magnetron resistance and continuity.
Testing procedures for capacitors, diodes, relays, and fan motors.
Resistance testing for ventilation, turntable, and stirrer motors.
Procedure to measure resistance of the touch key board connector pins.
Troubleshooting for display issues and incorrect number inputs.
Diagnosing problems where the unit does not heat up, checking interlocks and thermostats.
Troubleshooting no buzzer sound during cooking or at the end of cycles.
Troubleshooting for the ventilation fan not operating.
