Panasonic NN-SG676W CTH User Manual

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Microwave Oven

Model No.

© Panasonic Corporation 2012 Unauthorized

copying and distribution is a violation of law

NN-ST342M

Order No. MOD12 0837 8C E

25L

s

Power Requirement

Power Output

Microwave Frequency

Magnetron

Timer

Outside Dimensions

Cavity Dimensions

Net Weight

Shipping weight

Specifications subject to change without notice.

1,270 Watts (5.

Single phase, 3 wire grounded

2,450 MHz

2M219J

Volts AC 50 60Hz

220

800 Watts full microwave power (IEC60705)

0 ~ 99 min. and 50 sec.

1,270 Watts (10.

Single phase, 3 wire grounded

Volts AC 60 Hz

NN-ST342M(RPM)

NN-ST342M(RPH)

9A

)

12.7kg (approx.)

13.7 kg (approx.)

4 (W) x (H) x 400(D) mm

85 287

315(W) x 227(H) x 349 (D) mm

Silver

&

120

3 A)

(50Hz)

/(6.2A(60Hz))

Latin America

Questions and Answers:

V
Valerie SmithAug 8, 2025
Why my Panasonic Microwave Oven does not work?
- B
  Benjamin JohnsonAug 8, 2025
  If your Panasonic Microwave Oven isn't working, it might be due to overloading the outlet by using too many appliances at once. To resolve this, avoid using other electrical appliances while the microwave is in operation. Also, ensure the microwave plug is securely inserted into the outlet. Low AC input voltage can also cause this issue, so ensure you are using the microwave at an adequate line voltage. If the food temperature is too low, it may simply require a longer cooking time.
E
Edwin SampsonAug 14, 2025
What to do if Panasonic Microwave Oven is sparking?
- K
  Katie GriffinAug 14, 2025
  Sparks inside your Panasonic Microwave Oven are often caused by using metallic ware or allowing it to touch the oven wall. Avoid using metallic ware for cooking, unless specifically noted in the cooking guide. Another cause could be ceramic ware trimmed with gold or silver powder. Do not use any cookware with metallic trimming.
S
Sergio WoodAug 20, 2025
Why is the output power low on my Panasonic NN-SG676W CTH Microwave Oven?
- G
  gjohnsonAug 20, 2025
  If your Panasonic Microwave Oven seems to be operating but the output power is low, it could be due to several reasons. If the power source voltage is lower than 90%, you should contact your local electric power utility company or a qualified electrician. Other potential causes include a shorted contact at the primary switch (which would require replacing the primary and monitor switches), a defective P.C.B assembly (requiring replacement), or a defective magnetron (also requiring replacement).
J
Jose OrtizAug 27, 2025
What to do if Panasonic NN-SG676W CTH display works but doesn't start?
- J
  James FarmerAug 27, 2025
  If the display of your Panasonic Microwave Oven shows all figures set, but the oven does not start cooking when the START pad is touched, and the setting time does not count down, the secondary switch may need to be replaced. Also, if the fan motor or oven lamp do not turn on, the fan motor should be replaced.
C
Christopher GarzaSep 1, 2025
How to fix no microwave oscillation in Panasonic NN-SG676W CTH Microwave Oven?
- D
  Debbie CarterSep 1, 2025
  If your Panasonic Microwave Oven's oven lamp and fan motor are running, and the display operates properly, but there's no microwave oscillation, this could be due to a defective P.C.B assembly, a defective high voltage capacitor, a defective high voltage transformer, a defective magnetron, or a defective high voltage diode. Each of these issues would require replacing the respective component.

Panasonic NN-SG676W CTH Specifications

General

Brand	Panasonic
Model	NN-SG676W CTH
Category	Microwave Oven
Language	English

Summary

General Safety Precautions

Precautions for Avoiding Microwave Exposure

Steps to prevent excessive microwave energy exposure during servicing.

Servicing Cautions

High Voltage Hazards

Warning about high voltage and the need to discharge capacitors before servicing.

Microwave Radiation Hazards

Precautions against exposure to microwave radiation during servicing.

Technical Service Information

Microwave Leakage Testing

Detailed steps and precautions for testing microwave leakage.

Microwave Leakage Measurement Procedures

Measurement with Outer Case Removed

Procedure for measuring microwave leakage with the outer case off.

Notes for Measurement Accuracy

Measurement with Fully Assembled Oven

Procedure for measuring microwave leakage on a fully assembled unit.

Microwave Power Output Testing

Component Disassembly and Adjustment

High Voltage Transformer Removal

Procedure for safely removing the high voltage transformer.

High Voltage Capacitor and Diode Removal

Procedure for removing high voltage capacitor and diode.

Magnetron Removal

Detailed procedure for removing the magnetron, including safety notes.

Door Interlock System

Interlock Mechanism Overview

Installation and Adjustment of Latch Board

Interlock Continuity Test

Testing the continuity of primary, secondary, and monitor switches.

Component Resistance and Continuity Testing

High Voltage Transformer Testing

Procedure for measuring resistance of the high voltage transformer.

Magnetron Testing

Procedure for measuring resistance of the magnetron.

High Voltage Capacitor Testing

Procedure for measuring resistance of the high voltage capacitor.

High Voltage Diode Testing

Procedure for testing the continuity of the high voltage diode.

Fuse Testing

Thermal Cut-Out Testing

Appliance Troubleshooting Guide

Common Symptoms and Causes

Lists common issues, their causes, and remedies for the oven.

Trouble 1: Defective Control Circuit

Diagnosing and resolving issues related to the control circuit.

Trouble 2: Oven Does Not Operate

Troubleshooting steps when the oven is completely unresponsive.

Trouble 3: Oven Does Not Start Cooking

Trouble 4: Low Output Power

Troubleshooting low microwave output power during operation.

Trouble 5: No Microwave Oscillation

Diagnosing lack of microwave oscillation when other functions work.

Trouble 6: Improper Cooking Power Level

Parts List for NN-ST342M(RPM)

Parts List for NN-ST342M(RPH)

Printed Circuit Board Schematic

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