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Panasonic NN-SN977S - User Manual

Panasonic NN-SN977S
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© 2007 Panasonic Home Appliances Microwave
Oven (Shanghai) Co., Ltd. All rights reserved.
Unauthorized copying and distribution is a violation
of law.
NN-SD997S
NN-SD987S
NN-SD967S
NN-SN977S
NN-SN957S
NN-SN947S
APH(USA)
CPH(CANADA)
Microwave Oven
Please file and use this specified manual together with the service manual for Model NN-T695 (ORDER NO.
PHAMOS0501001C7).
ORDER NO.PHAMOS0701005A1
E1

Table of Contents

Questions and Answers

  • A
    Alexander BrownAug 6, 2025
    What to do if Panasonic Microwave Oven power shuts off in 37 seconds?
    • M
      Michael HoltAug 6, 2025
      If your Panasonic Microwave Oven shuts off after 37 seconds, here are a few things to check: * First, examine the magnetron wiring between the inverter and the magnetron terminal for any breaks and repair the magnetron circuit if needed. * Second, test D702; if it's shorted, replace the H.V. Inverter(F606Y8M00AP). * Finally, if D702 is okay, consider replacing the magnetron.
  • M
    mathew18Aug 20, 2025
    Why does my Panasonic Microwave Oven power shut off after 3 seconds?
    • N
      Nancy LopezAug 21, 2025
      If your Panasonic Microwave Oven shuts off after only 3 seconds, you should check for an open circuit in the Latch Switch, DPC, Power Relay, and CN701. Also, replace any defective components or correct any issues with the switch, cables, and connectors.

Summary

Safety and Warnings

General Service Safety

Crucial safety information for servicing microwave ovens.

Microwave Radiation Precautions

Guidelines to avoid exposure to microwave radiation during service.

High Voltage Inverter Safety

Inverter Power Supply Dangers

Warnings about high voltage and temperature hazards in the inverter.

Schematic Diagrams

APH Model Schematic

CPH Model Schematic

Measurements and Adjustments

Switch Adjustments

Procedures for adjusting latch and short switches for door operation.

Microwave Output Measurement

Method for measuring microwave output power using a simple test.

Microwave Leakage Procedures

Leakage Measurement Equipment

Tools required for measuring microwave energy leakage.

Leakage Measurement Procedure

Steps for measuring microwave leakage with and without panels.

Troubleshooting and Parts

Inverter;Magnetron Troubleshooting

Simple method to identify inverter or magnetron issues using the "3/37 seconds rule".

Digital Programmer Circuits

NN-SD997 S;SD987 S Programmer Circuit

Detailed schematic of the digital programmer circuit for specific models.

NN-SD967 S Programmer Circuit

NN-SN977 S Programmer Circuit

NN-SN957 S Programmer Circuit

NN-SN947 S Programmer Circuit

Detailed Parts Lists

NN-SD997 S;SD987 S;CPH Parts List

NN-SD967 S APH Parts List

NN-SN977 S;SN957 S APH Parts List

NN-SN947 S APH Parts List

Panasonic NN-SN977S Specifications

General IconGeneral
BrandPanasonic
ModelNN-SN977S
CategoryMicrowave Oven
LanguageEnglish

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