Panasonic NN-S960WA 1300w Inverter Microwave heats items but does not get them hot. There was a pop or crackling and a brief burned smell of an electrical component. After removing the cover, no obvious damage can be seen, except for load buzzing coming from the Hi-voltage microwave cage. All else is working fine. Just guessing here: I think...that the magnatron and inverter are both contained in this protective housing. The magatron is worth replacing but the inverter... cost more than the unit when new.
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And oven may have an inverter and it may have a sensor (usually either a heat sensor or humidity sensor).
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Mine did this once and it was the magnetron. Once replaced, it worked fine. Repair is an option if it is still under warranty or someone will do it on the cheap. Otherwise, just get a new microwave, since this is the main part.
Sounds like the magnetron has failed. This is the component that produces the microwaves that heats the food.
The cost of the magnetron is about 95% of the cost of a microwave oven.
Most people don't, for this reason, replace the magnetron, they replace
the whole oven which is probably what you will end up doing.
There is a possibility that the circuit that provides power to the
magnetron is faulty and you need to take it apart, find the proper
electrical leads and test them with a volt meter. To do this you have
to remove it from its mounting and take it apart. It is a fairly
lengthy process however.
No sorry the issue will be with eiher the inverter, the magnetron or the main timer board. There is a tracer signal that comunicates through these components and if it doesnt get to where it is supposed to go it wil just shut off, the big hint at that is the time interval. It is not something like a sensor heating up and causing a fault. it is not running long enough to get any thing hot it is in the electroincs. Too expoensive to repair, im sorry better to get a new one. Good Luck
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.
It's usually located on the floor of the oven behind the control panel, or with the door switches.
If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk
Feel free to contact me directly if you have further questions.
I appreciate your thoughtful rating of my reply.