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Ensuring proper grounding before repair work is imperative for safe operation.
Critical warnings regarding high voltage and temperature hazards associated with the inverter power supply.
Procedure for mounting and adjusting door latch switches for proper door operation.
Method for measuring magnetron output power using water heating and temperature rise.
Visual representation of all oven components for identification.
Detailed list of all replacement parts with part numbers for ordering.
Breakdown and parts list for the oven's door assembly.
List of wiring harnesses and lead wires used in the oven.
Details on packaging materials and included accessories.
Parts list for the escutcheon base assembly specific to NN-GD576M and NN-GD576W models.
Parts list for the escutcheon base assembly specific to NN-GT546W, ST556M, and ST556W models.
List of main components for the High Voltage Inverter Board, crucial for microwave operation.
Schematic and component details for the digital programmer circuit in NN-GD576M and GD576W models.
Schematic and component details for the digital programmer circuit in the NN-GT546W model.
Schematic and component details for the digital programmer circuit in NN-ST556M and ST556W models.
Detailed parts list specifically for the digital programmer circuit components.
This document provides a comprehensive service manual for the Panasonic Microwave Oven models NN-GD576M, NN-GD576W, NN-GT546W, NN-ST556M, and NN-ST556W. It is intended for use by trained and qualified repair technicians, emphasizing safety and proper procedures for maintenance and repair.
The Panasonic Microwave Oven is designed for domestic use, offering a range of cooking functions including microwave, grill, and combination cooking. It features an inverter power supply, which is a key component for driving the magnetron tube with high voltage and current, enabling efficient and consistent cooking. Some models are equipped with a steam sensor for enhanced cooking precision, automatically adjusting cooking time based on the food's steam output. The digital programmer circuit allows users to select various cooking modes, set timers, and utilize auto-menu functions for convenience. The oven cavity is designed to accommodate a turntable motor, ensuring even heating of food. The control panel, which varies slightly across models and regions, typically includes buttons for sensor auto menu, turbo defrost, reheat, weight settings, micro power, grill, combination cooking, stop/reset, and start. The display provides feedback on cooking settings and time.
The microwave oven is operated through its digital programmer circuit, which provides a user-friendly interface for various cooking tasks. Users can select specific cooking functions such as microwave-only for quick heating, grill for browning and crisping, or combination mode for faster cooking with a crispy finish. The "Sensor Auto Menu" feature, available on some models, simplifies cooking by automatically detecting the food's condition and adjusting cooking parameters. "Turbo Defrost" allows for efficient and even thawing of frozen foods based on weight. The timer function enables precise control over cooking duration, with options for both short and extended periods. Safety features include a door interlock system with primary, secondary, and short switches that prevent microwave operation when the door is open. The oven lamp illuminates the cavity during operation, allowing users to monitor the cooking process. The turntable ensures that food is rotated for uniform heating.
This service manual highlights several critical aspects for maintaining the microwave oven, primarily focusing on safety and proper component replacement. Technicians are warned about the high voltage and high current circuits within the inverter power supply, emphasizing the need for extreme caution during servicing. It is crucial to discharge the high voltage capacitors before touching any circuitry, as an electric charge can remain for up to 30 seconds after the oven is turned off. The aluminum heat sink, which can become very hot and energized, also requires careful handling. The manual strictly advises against attempting to repair the inverter PCB; instead, it should be replaced as a complete unit.
Grounding is a paramount safety concern. Technicians must ensure the appliance is properly grounded before any repair work and verify that the high voltage inverter power supply circuit board has a proper chassis ground connection via its grounding bracket. Regular checks for microwave radiation leakage are mandatory both before and after servicing, using specific procedures outlined in the full service manual (SIMMC0306022C3).
When replacing parts, only manufacturer-specified components, especially those marked with a "triangle" symbol, should be used to prevent hazards like microwave leakage, shock, or fire. The manual provides detailed instructions for adjusting the primary latch switch, secondary latch switch, and short switch to ensure proper door closure and interlock operation, which are critical for safety. If the 10A fuse blows due to the short switch, all related interlock components (primary latch switch, secondary latch switch, short switch, and power relay B) must be replaced. After any repair, it is essential to confirm that all screws are tightened, electrical connections are secure, and there is no microwave energy leakage. Technicians are also cautioned about sharp edges on the unit during unpacking, installation, or movement. The manual also includes a method for measuring microwave output to verify the magnetron's performance, ensuring the oven heats effectively.
General| Type | Microwave Oven |
|---|---|
| Capacity | 27 L |
| Microwave Power | 900 W |
| Grill Power | 1000 W |
| Power Output | 900 W |
| Turntable | Yes |
| Control Type | Touch Control |
| Weight | 16.5 kg |
| Cooking Modes | Microwave, Grill, Combination |
| Color | White |
| Auto Cook Menu | Yes |
| Child Lock | Yes |
| Voltage | 230 V |
| Frequency | 50 Hz |
| Turntable Diameter | 315 mm |
