Question about Microwave Ovens

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Panasonic dimenion 4/ nna772sbbpq

to robotek
the microwave seems to work but then after about 25 seconds it stops and the time resets and goes back to the clock & the food inside it has not heated it at all  you said that it could be magnotron, diodes, or power supply i have changed the magnotron but it hasn't made any difference could you tell if the diodes are on the inverter board & the supply is on the first board

ps    ill be carefull around the high voltage im a electrican i deal with 500volts every day
thanks dom

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  • Dominic Dance Feb 28, 2008

    n how best to check all of this

  • Dominic Dance Feb 28, 2008

    the grill and oven all still work was normal without cutting out does this mean the inverter board has gone

  • Dominic Dance Feb 28, 2008

    the oven & grill work fine it just seems to be on the microwave side it cuts out & resets it self back to the time

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2 Answers

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  • Microwave Ovens Master
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This can happen due to a bad door switch.

When you are decided to fix it and work on it, there's *critical* safety, disassembly, and troubleshooting info site (as well as a text file which helps in diagnosing and repairing door switch problems) click here.
Some helpful exploded view diagrams and order parts by entering your model number here: Kindly regards

Posted on Feb 28, 2008

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  • Master
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Sounds to me like the electronics are off, not the innards. do any of the presets work any differently than the timer? Try the popcorn setting

Posted on Feb 28, 2008

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1 Answer

I need a user manual for a panasonic dimenion 4


Do you have a model number (It will look something like NN-C803) .....if you do, you might find what you need at http://kitchen.manualsonline.com/manuals/mfg/panasonic/panasonic_microwave_oven_product_list.html

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you will have a failed magnatron, rectifier diodes to same, or a power supply fault.

Feb 14, 2008 | GE JES1851 Microwave Oven

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Microwave runs for 3 seconds and stops


See if this describes what's happening:
  • Put in time, push start and unit runs for 2 seconds, relay clicks, unit goes off. Cook time on display goes off and clock time comes back. Bad upper interlock switch and charred connector
If so, see http://207.234.249.73/mwd/safety.txt , http://207.234.249.73/mwd/disassembly.txt and http://207.234.249.73/mwd/doorsw.txt

Otherwise, if the digital programmer circuit / controller does not get a feedback signal from the inverter for a period of 3 seconds, the controller will stop the cook cycle.

That may be a loose connection in the wiring between the inverter, magnetron, and/or control board, or maybe one of those components has failed.


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

You can find an authorized Panasonic servicer here.

In Canada, you can find an authorized Panasonic servicer here.

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

May 31, 2010 | Panasonic Microwave Ovens

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Power to microwave but does not cook food


You didn't mention your brand or model number, but I'll assume it's a Panasonic since you posted this under a Panasonic category.

See if this describes what's happening:
  • Put in time, push start and unit runs for 2 seconds, relay clicks, unit goes off. Cook time on display goes off and clock time comes back. Bad upper interlock switch and charred connector
If so, see http://207.234.249.73/mwd/safety.txt , http://207.234.249.73/mwd/disassembly.txt and http://207.234.249.73/mwd/doorsw.txt

Otherwise, if the digital programmer circuit / controller does not get a feedback signal from the inverter for a period of 3 seconds, the controller will stop the cook cycle.

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

If it stops at 16 seconds and is a sensor model, it probably has a defective humidity sensor.

If it stops after 22 seconds, that means the controller has detected a problem, usually a problem with the inverter, controller, magnetron, or a bad connection from one or the other.

Display codes H95, H97, H98 or H99 mean that there's a problem with your inverter, magnetron, or digital programming circuit.

That may be a loose connection in the wiring between the inverter, magnetron, and/or control board, or maybe one of those components has failed.

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

You can find an authorized Panasonic servicer here.

In Canada, you can find an authorized Panasonic servicer here.

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

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1 Answer

Microwave shutts off after 2 seconds/


See if this describes what's happening:
  • Put in time, push start and unit runs for 2 seconds, relay clicks, unit goes off. Cook time on display goes off and clock time comes back. Bad upper interlock switch and charred connector
If so, see
http://207.234.249.73/mwd/safety.txt
http://207.234.249.73/mwd/disassembly.txt
http://207.234.249.73/mwd/doorsw.txt


Otherwise, if the digital programmer circuit / controller does not get a feedback signal from the inverter for a period of 3 seconds, the controller will stop the cook cycle.

It may be a loose connection in the wiring between the inverter, magnetron, and/or control board, or maybe one of those components has failed.


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

You can find an authorized Panasonic servicer here.

In Canada, you can find an authorized Panasonic servicer here.

If yours is not a Panasonic, please reply back with your brand and model number so we can help you.

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

May 22, 2010 | Panasonic NN-S592 Microwave Oven

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My sharp microwave just stopped working. It


IT IS POSIBLE TO HAVE A BURNED FUSE ON THEI Main boARD OF THE OVEN

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NN-T774 INVERTER STOPPED WORKING AFTER 4 WEEKS


Check to make sure one of the plastic hooks on the door was not broken off. If both door hook latches are functional then the most likely cause of your problem is one of the latch switches located behind the control panel. These switches will fail if the oven user opens the door frequently BEFORE the cook cycle ends. Always push STOP/RESET before opening any microwave oven door.

Dec 30, 2009 | Panasonic Microwave Ovens

2 Answers

Microwave turns off by itself after being on for 3 seconds


See if this describes what's happening:
  • Put in time, push start and unit runs for 2 seconds, relay clicks, unit goes off. Cook time on display goes off and clock time comes back. Bad upper interlock switch and charred connector
If so, see http://www.microwavedisplay.com/safety.txt and
http://www.microwavedisplay.com/disassembly.txt

Otherwise, if the digital programmer circuit / controller does not get a feedback signal from the inverter for a period of 3 seconds, the controller will stop the cook cycle.

It may be a loose connection in the wiring between the inverter, magnetron, and/or control board, or maybe one of those components has failed.


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

You can find an authorized Panasonic servicer here.

In Canada, you can find an authorized Panasonic servicer here.

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

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The first thing I would suggest is a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

Let us know if the hard reset does not fix it.

If it stops at 16 seconds and is a sensor model, it probably has a defective humidity sensor.

If it stops after 22 seconds, that means the controller has detected a problem, usually a problem with the inverter or a bad magnetron.

If you do indeed have a problem, Since it's less than one year old, it should be fully covered under warranty. I'd suggest contacting the manufacturer to get it fixed free.

I would recommend that you contact your nearest Panasonic-authorized servicer.

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

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