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General| Brand | Panasonic |
|---|---|
| Model | NN-SD291S |
| Category | Microwave Oven |
| Language | English |
Explains how the High Voltage Inverter Power Supply controls output power via PWM signals.
Details the function of the Inverter Power Supply circuit, including voltage conversion for the magnetron.
Describes the Auto Control feature for inverter defrost and its operation sequence.
Explains Auto Sensor Cooking, using a humidity sensor to detect steam for automatic cooking.
Emphasizes the importance of proper grounding for microwave oven safety during repair.
Highlights high voltage and temperature hazards associated with the Inverter Power Supply.
Details troubleshooting steps when the 20A fuse blows, involving interlock switches and power relay.
Warns against inserting metal objects into the oven, which can cause microwave leakage.
Outlines checks required after repair, including screw tightness, connections, and leakage.
Advises caution due to sharp edges on internal parts during disassembly and reassembly.
Details continuity testing procedures for interlock switches and power relay RY1.
Explains how to test the continuity of the monitor switch with the door in different positions.
Describes continuity checks for the magnetron filament and case to diagnose faults.
Provides a test procedure to verify the function of the humidity sensor in the digital programmer circuit.
Details mounting and adjusting interlock and monitor switches to the door hook assembly.
Outlines a simple method for measuring microwave output power using water temperature rise.
Lists the necessary equipment for measuring microwave radiation leakage.
Details the step-by-step process for measuring microwave radiation leakage.
Explains leakage measurement after replacing the magnetron with the outer panel removed.
Describes leakage measurements on a fully assembled oven, checking door periphery and openings.
Specifies requirements for recording leakage readings and notifying authorities if limits are exceeded.
Provides failure codes (H95, H97, H98, H99) and troubleshooting steps for inverter and magnetron issues.
Lists main parts of the H.V. Inverter Board for identification and replacement.
Provides a visual exploded view of the oven assembly with numbered parts.
Lists replacement parts with reference numbers, part numbers, descriptions, and quantities.
Details the components and parts list for the oven's door assembly.
Lists the parts and components for the escutcheon base assembly, including the control panel.
Details the items included with the oven and the packing procedure for accessories.
Lists and describes the various lead wire harnesses used in the microwave oven.
Presents the detailed schematic diagram for the Digital Programmer Circuit.
Provides a parts list for components related to the Digital Programmer Circuit.
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