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SOURCE: Panasonic microwave buzzing noise
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
SOURCE: Microwave won't heat/Makes buzzing noise.
The symptoms you are describing are typical of a magnetron that has gone bad. Continuing to attempt to use the oven in its current condition can cause further damage. So, I would recommend not using it. Microwave ovens are considered dangerous and repairs should not be attempted by anyone that is not electronic saavy. The High Voltage Network inside the oven has voltage potentials of 14,000 volts and higher. If you feel this is something you wish to attempt, the Magnetron part number is 1156751 and costs approx. $158. Keep in mind, if the magnetron has been arcing and making a burning smell you may have burned the protective coating that lines the walls of the waveguide. If the waveguide is damaged it is not repairable. I do not know if this is a replaceable item on your model microwave. Double check your warranty information and/or owner's manual. In many cases the magnetron is warranted for several years beyond the limited warranty that comes with most appliances. Post back with comments and let me know if you want me to assist you further. In addition, if you provide me with your EXACT model number (located along the door opening) I can narrow down parts a little better. I know this all sounds discouraging, but I do hope I have been able to help you.
SOURCE: Kitchenaid builtin microwave buzzing
I would recommend changing the diodes as well. This will usually take care of the problem.
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.
SOURCE: whirlpool microwave makes loud buzzing noise
When your microwave oven won't cook your food, and, you hear a loud buzzing sound, it’s normally caused by a faulty (a) diode (b) high-voltage capacitor (b) magnetron.
The diode would be the most likely culprit of the three components. It’s also by far the cheapest!
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