Question about Panasonic NN-T655SF Microwave Oven

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Sparking behind the wave guide in model NN-T664

After going about 10-15 seconds, there is a loud, kind of grinding sound and when you look inside, you can see a "spark" or light behind the wave panel. It is the sound that a microwave makes when there is metal on something heating in the unit. It doesn't happen every time but is happening more and more frequently.

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The antenna on the magnetron is wearing out becuase it is damaged. Replacing the antenna from another magnetron normally solves his problem.

Posted on May 13, 2009

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Posted on Jan 02, 2017

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The top plate inside the microwave sparks while cooking. We checked the dish we were cooking with, the papertowel that covered the dish. What could be causing this?


The wave guide could be dirty or damaged. Dirty oven interior can also cause sparking. The wave guide is probably not dirty if it's not on the interior of the oven . Some are behind the interior wall .

Mar 28, 2010 | Whirlpool MH7140XF Microwave Oven

1 Answer

GE Profie JE1860SH 04 microwave sparks


Our JE1860SH was also sparking after a few seconds. The GE tech pulled the upper round disk and found the problem. The plastic was burned and the round metal which is behind the plastic dome was arching with the frame. Lasted seven years expected more especially from a GE product. So my suggestion is to remove the dome and check it out.

Jan 03, 2010 | GE Profile Spacemaker Over-the-Range...

1 Answer

Our microwave continually arcs when you start it up, so we quickly turn it off.


on the inside of the oven on the right you will find a small square of mica this is the wave guide cover have a look and see if it burnt or out of shape if it is then unplug the unit and remove and replace it make sure u clean the area where it sits as food can get behind the cover hope this helps

Oct 15, 2009 | Panasonic NN-H264 Microwave Oven

1 Answer

Arcing and noise when turn it on


I cleaned the microwave really well. I used a screwdriver to pull the plastic cover out enough to clean behind the edges with a soft toothbrush. Seems to have corrected the problem.

Oct 15, 2009 | Whirlpool MT4155SP Microwave Oven

1 Answer

I have a Panasonic Inverter Model NN-T664.It acts


This is usually caused by either a bad door switch or a loose door switch mount, which are pretty simple problems to fix.

Even though a door switch clicks, it may still be bad inside.


Door switch or mount trouble is usually caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

If the switch mount is broken, it's usually more economical and safer to add a dab or two of hot glue to the mount to secure the switch. Let it cool for about 30 minutes before using.

One test that sometimes helps is to gently lift up (and/or push down) on the door or handle as you try to start it. If it works or tries to work, then it's a door switch mount or door alignment issue.

If you only need a switch, you can order a universal type here for $5 postpaid.

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

Oct 11, 2009 | Panasonic Microwave Ovens

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.

Mar 04, 2009 | Panasonic NN-S963BF Microwave Oven

1 Answer

Micro Wave shuts down


If it stops after 22 seconds, that means the controller has detected a problem, usually 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.

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.

Nov 19, 2008 | Panasonic NN-S443WF / NN-S443BF 1200 Watts...

1 Answer

Loud grinding sound and mechanical odor


Quite often this is due to grease or food particles stuck to the inside of the oven or stuck on or behind the waveguide cover.

The waveguide cover is usually about the size of a playing card and often held in place by a plastic rivet.

In some models it is a larger stirrer cover type made of thicker plastic in the ceiling of the oven.

It can be fragile, and the metal edges of the oven behind it can be sharp, so be careful!

The cover and the metal behind it should be cleaned with a mild, non-ammonia cleaner.

If the cavity metal of the oven is chipped or charred, it will have to be sanded smooth and clean and dried thoroughly.

Then you can apply some high-temperature appliance paint, available from places like Wal-Mart, Lowe's or Builder's Square.

If your waveguide cover is burned, it will need to be replaced. It provides important protection for the magnetron.

Please reply back with more details if this does not solve your problem.

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

Aug 10, 2008 | Kenmore 62622 Microwave Oven

5 Answers

Popping and shooting sparks


Hi There!
Check behind the "Wave Guide Cover" on the inside cavity. There may be moisture or food residue behind it. Should be a cover that is plastic or Mica. Really strange that it's sparking being new. Also check that you use plates without gold or silver trimmings (Crockery or porcelein). This will also cause sparking. Remember that microwaves will always go to the first organic source in its path. The wave guide cover, if soiled, is very close to the tip of the Magnetron and will therefor result in arcing. Good Luck, JUS004

Feb 26, 2008 | Frigidaire PLMV169DC Microwave Oven

2 Answers

Microwave oven problem


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. You can find one here:

http://www.panasonic.co.in/

Oct 16, 2007 | Panasonic NN-C980 Convection/Microwave...

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