This document is a service manual for Panasonic microwave ovens, covering various models including NN-P794, NN-T794SF, NN-T784SF, NN-T774SF, NN-T764SF, NN-T754SF, NN-H764, NN-S754, NN-H744, NN-S744, and NN-H724. It also includes information for models NN-S560BF/WF, NN-S550BF/WF, NN-S540BF/WF, NN-L530BF/WF, NN-L520WF, and NN-S510WF. The manual provides essential information for experienced repair technicians to safely and effectively service these appliances.
Function Description
The Panasonic microwave ovens covered by this manual are designed for cooking and reheating food using microwave energy. They feature a digital programmer circuit for controlling cooking functions and time. Specific models may include additional features such as "Inverter Turbo Defrost," "Inverter Auto Cook," "Sensor Cook," "Quick Min," and "Popcorn" settings. The ovens utilize a magnetron to generate microwave energy, a fan motor for cooling and air circulation, and a turntable motor for even cooking. Safety interlock switches are integrated into the door assembly to prevent microwave emission when the door is open.
Important Technical Specifications
General Specifications (for NN-P794, NN-T7xxSF, NN-H7xx, NN-S7xx models):
- Power Source: 120V AC Single Phase, 60Hz
- Power Requirement: 1460W
- Output (IEC705-88): 1200W or 1250W (varies by model)
- Microwave Frequency: 2450MHz
- Timer: 30 min. / Stage (HIGH Power) ~ 5 Stage Maximum; 99 min. 99 sec. / Stage (Other Power Levels) ~ 5 Stage Maximum
- Outside Dimensions: 21 7/8" (555mm)(D) x 19 9/16" (497mm)(W) x 11 15/16" (304mm)(H)
- Oven Cavity Dimensions: 16 7/16" (418mm)(D) x 18 1/2" (470mm)(W) x 9" (228mm)(H)
- Weight: 31 lbs. / 14.3kg
- Fuse: 18A/120V, 60Hz
Specifications for APH (USA) Models (NN-S560BF/WF, NN-S550BF/WF, NN-S540BF/WF, NN-L530BF/WF):
- Power Source: 120V AC Single Phase, 60Hz
- Power Requirement: 1370W
- Output (IEC705-88): 1000W, 1100W, or 1300W (varies by model)
- Microwave Frequency: 2450MHz
- Timer: 99min.99sec
- Outside Dimensions: 20 3/8" (518mm)(W) × 16" (407mm)(D) × 11 7/8" (301mm)(H)
- Oven Cavity Dimensions: 14 3/4" (375mm)(W) × 15 3/16" (386mm)(D) × 8 7/8" (225mm)(H)
- Weight: 26.5 lbs. (12.0kg)
Specifications for CPH (CANADA) Models (NN-S560BF/WF, NN-S540BF/WF, NN-L530WF, NN-L520WF, NN-S510WF):
- Power Source: 120V AC Single Phase, 60Hz
- Power Requirement: 1370W
- Output (IEC705-88): 1000W, 1100W, or 1200W (varies by model)
- Microwave Frequency: 2450MHz
- Timer: 99min.99sec
- Outside Dimensions: 20 3/8" (518mm)(W) × 16" (407mm)(D) × 11 7/8" (301mm)(H)
- Oven Cavity Dimensions: 14 3/4" (375mm)(W) × 15 3/16" (386mm)(D) × 8 7/8" (225mm)(H)
- Weight: 26.5 lbs. (12.0kg)
Usage Features
The microwave ovens offer a range of cooking programs and controls:
- Digital Programmer Circuit: Allows users to set precise cooking times and power levels.
- Power Levels: Multiple power settings, from HIGH to lower levels, for diverse cooking needs.
- Timer Functions: Includes stage cooking for complex recipes and a maximum timer of 99 minutes and 99 seconds for other power levels.
- Specialized Cooking Functions: Depending on the model, these may include:
- Three Stage Cooking: For recipes requiring different power levels or times.
- Inverter Turbo Defrost: For quick and efficient defrosting.
- Inverter Auto Cook: Pre-programmed settings for various food items.
- Sensor Cook/Reheat: Automatically adjusts cooking time based on steam detection from food.
- Quick Min: For quick one-minute cooking.
- Popcorn: Optimized setting for popping popcorn.
- Display Window: Shows cooking time, program settings, and error codes.
- Door Opening Button: For easy access to the oven cavity.
- Turntable: Ensures even heating of food.
Maintenance Features
The service manual provides detailed instructions for maintenance and repair, emphasizing safety and adherence to regulatory standards:
- Safety Warnings: Highlights the importance of servicing by trained personnel due to high voltage and microwave radiation risks.
- Radiation Leakage Measurement: Procedures for checking microwave leakage before and after servicing, with strict limits (2 mW/cm² for USA, 1 mW/cm² for Canada) to ensure safety.
- Component Replacement: Specific instructions for replacing critical parts such as the magnetron, interlock switches, power relays, and digital programmer circuit components.
- Lead-Free Solder (PbF) Caution: Advises technicians on the higher melting point of lead-free solder and the need for appropriate soldering iron temperatures (370 ± 10°C) to prevent splashing.
- Troubleshooting Guide: A comprehensive section to diagnose common issues such as "Oven is dead," "No display," "Timer starts count down but no microwave oscillation," and "Microwave output is low," along with corresponding causes and corrections.
- Disassembly and Parts Replacement Procedures: Step-by-step guides for disassembling the magnetron, digital programmer circuit, membrane key board, low voltage transformer, power relays, fan motor, door assembly, and steam sensor.
- Component Test Procedures: Methods for testing various components, including the Inverter Power Supply, primary latch switch, secondary latch switch, short switch, magnetron, and steam sensor.
- Wiring Diagrams: Detailed diagrams for both APH (USA) and CPH (Canada) models to aid in correct wiring and troubleshooting.
- Parts List: Extensive lists of all components with part numbers, descriptions, and applicable models for accurate ordering and replacement.
- Calibration: Recommends annual calibration of radiation monitors by the manufacturer.
The manual also includes specific warnings regarding high voltage areas and the importance of discharging capacitors before servicing. It stresses that unauthorized copying and distribution of the manual are violations of law.
To Next Page
Need help?
General
