Our microwave was purchased in May 2000 and was working well until 2 days ago when we noticed that the food was heating a lot slower than usual. Something that used to cook in 9-10 minutes at 100% power is now taking 40-45 minutes and more. We tried changing the power levels, but there was no noticeble change. There's a new buzzing noise when the owen is working. The turntable, light, etc are all working. We've not had any other problems with it before. Since the unit is less than 7 years old, we're disppointed that we may need to replace such an expensive product so soon. Is there an economical solution for this? I find that comparative size owens from other manufacturers cost between $100-130, in which case it doesn't seem worth it to get this repaired. Does this model of Panasonic m.wave owen have severe problems? Any help/advice would be appreciated. Thanks.
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Re: Panasonic NN- S760BA heating problems
Chances are it has a bad magnetron.
If you decide to have it serviced, I would definitely recommend that you contact a servicer who is authorized by Panasonic.
You can find them here: http://www2.panasonic.com/webapp/wcs/stores/servlet/vServiceLocator?storeId=15001
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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.
your magnetron is the heating element. it sends out microwaves that jiggle the water molecules inside the food causing them to heat. this is whats malfunctioning causing your problem. youll have to have a technician replace it
check the thermostat mounted on the side of the magnetron,it has 2 wires on it and opens the circuit to the magnetron if it overheats,they can get weak and open too soon so the mag can't operate long enough to properly heat the food,to test it just bypass it bo tying the 2 wires together,then if it cycles properly just replace the part,don't leave it bypassed though because it is for fire safety
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.
If you described this to Panasonic very carefully, and they said it's normal, then I would say keep using it until such time that you get other symptoms.
The inverter has some parts mounted on a large chunk of aluminum called a heat sink. It draws the heat out of the parts and the heat radiates and/or convects away. This keeps the circuit parts from overheating.
As long as you have good air flow through the vents, it sounds okay.