Question about Microwave Ovens
Microwave is loud when operating , is that the inverter making the noise , is it normal
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Posted on Jan 02, 2017
Almost certainly, the component called the "magnetron" has died. This is the valve (tube in the US) which actually generates the microwaves. The loud humming is the transformer that supplies the magnetron being overloaded and/or the magnetron itself. If the rest of the appliance is OK and not too old, the magnetron can be replaced. If you aren't familiar with these appliances, you *must* get this done by someone who understands the dangers of messing with them - if you get it wrong, they can bite! In some countries, only qualified engineers can buy the spare parts. In the UK, the part costs around £40 - £80, depending on the model. If the appliance is more than around three years old, it may be a false economy to repair it as other parts may fail soon after the repair.
Posted on Sep 24, 2007
Found this Panasonic post in the Samsung section!
If it moves just a tiny bit when the door opens and then stops, that's normal.
If it keeps running when the door is open, that's usually due to a bad door switch or broken / loose door switch mount.
If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and
disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk
Any Panasonic parts not available locally can be had here: http://www.pasc.panasonic.com/epartr
We appreciate your thoughtful rating of our answer.
Posted on Nov 17, 2007
Yes, this is usually a shorted high voltage rectifier diode.
It is usually located behind the high voltage transformer and it attaches to the magnetron and to the chassis.
For ciritical safety links how to test the diode, see: http://www.gallawa.com/microtech/diode.html
Panasonic replacement parts can be found here: http://www.pasc.panasonic.com/epartr
Posted on Dec 06, 2007
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:
We're happy to help and we appreciate your thoughtful rating of our answer.
Posted on Dec 17, 2007
SOURCE: Hi, I have a NN-C784MF
Chances are there are other bad parts blowing the diodes, most likely a MOSFET.
Also, the ESR of the electrolytic capacitors should be checked and all board connections must be checked and resoldered if suspect.
If you're not experienced in troubleshooting switched-mode power supplies (inverters) then you can probably save a lot of timer and money by replacing the whole inverter.
You can find the nearest spare parts supplier by selecting your country then the support links at Panasonic.net.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Jan 02, 2009
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