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NN-6859 microwave loud drone noise - Panasonic Microwave Ovens

Posted by Anonymous on

3 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

MicrowaveSvc
  • 9047 Answers

SOURCE: panasonic microwave nn-s963bf making grinding noise

The turntable system consists of the motor, the coupler, the turntable support with rollers, and the tray.

You can see and hear a video of how a turntable motor should sound when you rotate it by hand.

If yours is not set to be off via the control panel, and it won't rotate or it sounds like it's grinding, etc., you may have a bad motor or plastic coupler.

To replace either, you need to unplug power, then remove the bottom cover of the oven.

You can
order parts for this brand from Encompass (formerly Tritronics). Or you can call them toll-free at 866-779-5835.

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

Posted on Mar 06, 2009

kel1guy2002
  • 3740 Answers

SOURCE: I have a Natioanl NN-6207

F and Fa could be the problem but.... You must check the power diode and the high voltage capacitor. One of these is most likely the reason the fuse failed in the first place. Ground the HV capacitor by holding an insulated screwdriver well back on the handle. The locate the Power Diode that will have at least ONE terminal that connects to the capacitor. Power doides are either 3'8 inch wide and 2 inches long or round an liik like a bit resistor with no color markings. ' Check the HV capacitor by rading each terminal to the case of the capacitor (no shorts allowed)
Then read across the capacitor terminals with the meter set on R x 10K. Watch for an initital jump in resistance and then it drifts up to infinity. Reverse test lead positions and you must get the same result. Resistance and then drift to infinity. Any other reading.... infinity in both directions, short to the case or short across the 2 terminals = bad Cap.
If after you perform the above tests and you still have the problem ... knowing you might pop another fuse there are 3 door switches. 2 of them will read resistance / continuity across the terminals when the door is close and one of them will read continuity across the terminals when the door is open. One of the 3 switches has 3 wires on it... the 3rd wire shorts the magnetron power when the door is open and the power relay / HV circuit is powered. This is a built in blow the fuse to prevent magnetron operation with the door open.

I think your are going to find that either the power diode or the HV Capacitor has failed.

Thanks for choosing FixYa,
Kelly

Posted on Apr 16, 2011

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Sounds like the magnatron (the bit that creates microwaves) could be goosed. Remove outer cover ( Isolate from the electric supply then remove screws at bottom on the sides).

Find big lump that says on magnatron with model nos etc on, any good electrical supply shop ( Maplins etc) should stock new one.

It is easy to change. It took me about half an hour having never done one before.

Buyer beware the price of the parts could be in excess of a new microwave.

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1 Answer

Panasonic microwave nn-s963bf making grinding noise


The turntable system consists of the motor, the coupler, the turntable support with rollers, and the tray.

You can see and hear a video of how a turntable motor should sound when you rotate it by hand.

If yours is not set to be off via the control panel, and it won't rotate or it sounds like it's grinding, etc., you may have a bad motor or plastic coupler.

To replace either, you need to unplug power, then remove the bottom cover of the oven.

You can
order parts for this brand from Encompass (formerly Tritronics). Or you can call them toll-free at 866-779-5835.

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

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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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Panasonic NN- A712 combination Microwave 1000w - Switches off after 20 seconds


The 22 seconds is the giveaway.

In most cases, this is a problem with the inverter or a bad magnetron.

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

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

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

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