Question about Panasonic NN-S954WF Microwave Oven

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Panasonic nn-sn667b 1300w dead

Microwave used inverter circuit.the high voltage output transistor one of them burned one zenor diode shorted and one diode burned out.Ican't recognise the parts no or nothing.somebody could help me please

Abraham

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You might consider just replacing the inverter assembly itself.

It will cost more than replacing the bad discrete components of course, but you would be avoiding the time and money involved in parts research, trial and error, and possible destruction of any newly installed parts if there remain other undiscovered defective components.

The inverter assembly (part # F606Y8M00AP) can be had for $79.12 here.

Otherwise, you would need to order the service manual, which is not listed by the major Panasonic distributors.

The service manual should be # SM-NNSN667.

The best place to order Sharp parts is Tritronics. Or you can call them toll-free at 866-779-5835.

In this case, call might be more productive to track down the service manual.

Good luck, and be safe.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Dec 25, 2008

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Panasonic Dimension 4 Microwave- Model NN D801. Whilst microwaving for 2 mins on high - heard a zapping noise. Didnt heat food. Front operating panel works. turntable still works. Any suggestions?


A "zapping noise" usually indicates a problem in the high voltage circuit. If it's an inverter oven, it should have provided you with a fault code. If a non-inverter, the most likely causes are a shorted high voltage rectifier or bad magnetron. But there are many other possible causes.

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I have panasonic nn-gs597m microwave its working normal but not heating, I opened the cover magnetron is hot the fan is working. Any help?


follow the next steps , use the VOM and fix it. God bless you

Diode

The high voltage diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron which emits the energy that cooks the food. If the diode burns out, a lower A/C voltage reaches the magnetron, which is not sufficient to power the magnetron. When the diode fails it is often visibly burned out. If it appears to be good, it can be tested with a volt-Ohm meter capable of testing diodes. High voltage diodes frequently fail and are one of the most common points of failure in a microwave oven. A regular meter with a diode checker will not work to check these diodes. You have to use a meter with a 9 volt battery or put a 9 volt battery in series with the diode to check it.


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Door Switch

If the microwave does not heat, one of the door switches might be defective. Microwave ovens normally have three door switches, if any of them fail the microwave does not turn on and does not heat. Check the switches for continuity with an Ohm meter.





Magnetron

If the microwave oven doesn't heat the magnetron tube might have burned out. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the microwave oven is turned on when it is empty this can cause the magnetron to burn out. Once it is burned out it has to be replaced, it's not repairable.





High Voltage Capacitor

If the microwave doesn't heat the high voltage capacitor might be defective. The high voltage capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. If the capacitor is burned out the entire high voltage circuit stops working properly. The high voltage capacitor can be checked with a special VOM meter which has a capacitance testing capability. Be aware that the high voltage capacitor can retain a charge of more than 3,000 volts and can injure or kill a person if not handled properly. Only trained technicians should perform this type of testing.





High Voltage Transformer

If the microwave does not heat, the high voltage transformer might be burned out. Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food. When a high voltage transformer fails it will usually arch and have a burning smell.





Thermal Fuse

If the microwave doesn't heat the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.





Thermoprotector

If the microwave doesn't heat the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.





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If the microwave doesn't heat the main control board may be defective. This is not common. When a microwave doesn't heat the problem is usually a faulty door switch or within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.

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1 Answer

[Identical to earlier posting by stefeckstein]


Check for a circuit breaker on the back. If nothing, pull the plug and remove the case. Look for a blown fuse. If so, look for a shorted high voltage diode in the magnetron power supply or a shorted stirrer bearing located above or beside the cavity area where the microwaves enter. The stirrer is a metal fan-like device with a plastic bearing that often arcs internally. That shorts the microwaves out and blows a fuse. Replace the stirrer.

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All:
I have a 2003 Sears Ultra Wave microwave 721.63682300 with a similar problem. A few months ago it started giving off short buzzes when turned on. That stopped but then I noticed that everything took twice as long to heat up. After quite a bit of teardown&inspection I found a circuit break in the inverter board leading to ZD704 diode (pictured). I will now try to find a replacement diode to see if replacing will fix it. Thanks for your postings.

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NNC2000P - Microwave does not work but convection works


An IGBT is an insulated gate bipolar transistor - sort of a hybird between a bipolar transistor and a MOSFET.

These are the final output driver transistors in the high-voltage inverter.

If it stops after 7 seconds, it still has a problem with the inverter.

It's likely a bad transistor, an electrolytic capacitor with an internal short or bad ESR or altered value, bad connection on the inverter board, a shorted diode or blown resistor, or a bad connection in the wiring.

Reputable service centers will have a repair warranty, but it may only be 30-90 days.

Due to the lethal voltages used and produced in inverters, I do not recommend that an inexperienced person work on these.

You should use a Panasonic-authorized service center so they'll have the service manual and (hopefully) experience and training to repair inverters.

In the US, you can find an authorized Panasonic servicer here.

This sounds like a non-US model. If so, visit panasonic.net, find your home country, then find the service / support links.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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Microwave causes GFCI on another circuit to trip


You may have a shorted High voltage component. Possibly a recttifier,aka, diode. This should only be replaced by an experienced repairman as an extremely high voltage shock potential exists.

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When the microwave sounds okay, but there's no heat, one of the internal door switches, the high voltage circuitry, or the circuit board may have a problem. To resolve this problem, you need the assistance of a qualified appliance repair technician.
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Wattage is based upon voltage & current. I would think that on the 1300W unit, either the voltage or the current is higher than that which is used on the 1200W unit.

Perhaps the magnetron in the 1300W unit is being driven harder. Are the fans the same size?, The magnetron in the 1300W could be running harder and they have a larger fan in it.

In any event, if the part numbers are the same, you should have no trouble using one units parts to fix the other.

Good luck!

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