Table of Contents
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Please file and use this manual together with the service manual for Model NN-S262SF (Order
No.SIMMC0203005C1)
NN-SD297SR
NN-SD297BR
NN-SD297WR
NN-SD277SR
NN-SD277BR
NN-SD277WR
NN-SA247SR
NN-P295SFR
NN-P295WFR
NN-S255WFR
NN-S245WFR
CPH(CANADA)
© Panasonic Home Appliances Microwave Oven
(Shanghai) Co., Ltd. 2009.
ORDER NO.PHAMOS0902007A1
Microwave Oven
E2
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Table of Contents
Troubleshooting
Related Manuals for Panasonic NN-S255WFR
Summarization of Contents
Service Manual Introduction
Model Specifications
Technical specifications for various Panasonic microwave oven models.
Safety Information
General Safety Precautions
Essential safety messages and warnings for users and service personnel.
Microwave Exposure Avoidance
Precautions to prevent exposure to excessive microwave energy during servicing.
Inverter High Voltage Danger
Specific warnings about high voltage and temperature hazards of the inverter.
Lead-Free Solder Handling
Guidelines for handling lead-free solder, including temperature and splash precautions.
Schematic Diagrams
NN-SD297SR/BR/WR, P295SFR/WFR Schematics
Detailed schematic for specific Panasonic microwave oven models.
SD277SR/BR/WR Schematics
Wiring diagram for SD277SR/BR/WR Panasonic microwave ovens.
NN-SA247SR, S245WFR Schematics
Schematic diagram for NN-SA247SR and S245WFR microwave ovens.
NN-S255WFR Schematics
Schematic diagram for the NN-S255WFR Panasonic microwave oven.
Operating Sequence Descriptions
Variable Power Cooking Control
Explanation of how the inverter power supply controls microwave output power.
Inverter Power Supply Circuit
Details on the function and operation of the microwave's inverter power supply.
Inverter Defrost Operation
Description of the inverter defrost feature and its operation sequence.
Sensor Cooking
Explanation of the auto sensor cooking process using humidity detection.
Sensor Reheat Function
Guide to using the sensor reheat function for quick food warming.
Troubleshooting Cautions
Grounding Checks
Importance of proper grounding for safety during microwave repair.
Inverter System Warnings
Critical safety warnings regarding high voltage and hot surfaces on the inverter.
Part Replacement Procedures
Guidelines and precautions for replacing internal components.
20A Fuse Blow Troubleshooting
Procedure for diagnosing and replacing parts when the 20A fuse blows.
Foreign Object Insertion Warning
Warning against inserting foreign objects to prevent microwave leakage.
Post-Repair Verification
Steps to ensure safety and proper function after completing repairs.
Sharp Edge Caution
Cautionary note about sharp metal edges inside the appliance.
Component Test Procedures
Door Interlock & Power Relay Tests
Testing procedures for door interlock switches and power relay.
Monitor Interlock Switch Test
Procedure to test the continuity of the monitor interlock switch.
Magnetron Testing
Testing methods for magnetron filament continuity and case leakage.
Inverter Power Supply Testing
Diagnostic tests for the High Voltage Inverter power supply unit.
Humidity Sensor Test
Procedure to test the functionality of the humidity sensor.
Measurements and Adjustments
Door Switch Adjustments
Installation and adjustment guidelines for door interlock switches.
Microwave Output Measurement
Simple method to measure microwave output power using temperature rise.
Microwave Energy Leakage Measurement
Leakage Measurement Equipment
Required equipment for measuring microwave radiation leakage.
Leakage Measurement Procedure
Step-by-step guide for measuring microwave leakage with a radiation monitor.
Record Keeping and Notification
Requirements for recording leakage readings and reporting excessive levels.
Radiation Monitor Calibration
Importance of annual calibration for radiation monitoring equipment.
Troubleshooting Guide
Inverter and Magnetron Troubleshooting
Diagnosing common issues related to the inverter and magnetron using failure codes.
Simple Inverter/Magnetron Troubleshooting
A straightforward method for identifying inverter or magnetron problems.
H.V. Inverter Board Parts List
List of main parts for the High Voltage Inverter board.
Exploded Views and Parts Lists
Exploded View of Components
Illustrated breakdown of microwave oven components for identification.
Overall Parts List
Comprehensive list of all replaceable parts with part numbers.
Door Assembly Parts
Detailed breakdown and parts list for the microwave oven door assembly.
Escutcheon Base Assembly Parts
Exploded view and parts list for the escutcheon base assembly.
Packing and Accessories
Instructions and list of items included for packing and accessories.
Wiring Materials
Identification and listing of various wiring harnesses and materials.
Digital Programmer Circuit Schematics
NN-SD297SR/BR/WR CPH Schematics
Schematic diagram for the digital programmer circuit of specific models.
NN-P295SFR/WFR CPH Schematics
Schematic of the digital programmer circuit for P295SFR/WFR models.
NN-SD277SR/BR/WR CPH, S255WFR CPH Schematics
Digital programmer circuit schematic for SD277SR/BR/WR and S255WFR models.
NN-SA247SR CPH, S245WFR CPH Schematics
Schematic of the digital programmer circuit for SA247SR and S245WFR models.
Digital Programmer Parts List
Parts list specifically for the digital programmer circuit components.
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