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Procedure for ensuring proper electrical grounding before repair.
Hazards associated with the high voltage inverter power supply and safety precautions.
Guidelines for safely replacing components, including power cord disconnection.
Steps to take when the 10A fuse blows, involving specific switch replacements.
Warning against inserting metal objects to prevent microwave leakage.
Post-repair checks including screw tightness, connections, and leakage tests.
Caution regarding sharp edges on the unit during handling.
Instructions for adjusting door latch and short switches for proper door operation.
Procedure for measuring microwave output power using a simple water heating test.
Visual breakdown of the oven's components with reference numbers.
Comprehensive list of all replaceable parts with part numbers and remarks.
Specific parts list and diagram for the oven door assembly.
List and diagrams of essential wiring components and harnesses.
Details on packaging materials and included accessories for shipping or inclusion.
Parts list and diagrams for the escutcheon base and related components.
Schematic for the digital programmer circuit for NN-GD576M/GD576W models.
Schematic for the digital programmer circuit for the NN-GT546W model.
Schematic for the digital programmer circuit for NN-ST556M/ST556W models.
Comprehensive parts list related to digital programmer circuits for various models.
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| Capacity | 27 Liters |
|---|---|
| Grill Power | 1000 W |
| Weight | 14 kg |
| Turntable Diameter | 315 mm |
| Auto Cook Programs | Yes |
| Turntable | Yes |
| Cooking Modes | Microwave, Grill, Combination |
| Color | Silver |
| Auto Cook Menu | Yes |
| Child Lock | Yes |
| Voltage | 230 V |
| Frequency | 50 Hz |
| Type | Microwave Oven |
