Question about Microwave Ovens

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Bought Panasonic NN-S766 microwave in 1997. Been great. Has begun to run 2-4seconds, blows fuse. Also makes a louder(different) hum while running. All switches look good, magnatron magnets look good. Need some help.

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With the prices of microwave's & since you've had it since '97 that's almost 18 yrs. don't you think you can put it out of it's misery & get a new one? Check Craig's list, the penny saver or yard sales, you'd be surprised how inexpensive they are now. I use to sell Panasonic when they first came out, so many yrs. ago,. I've always had great results with Panasonic microwaves.

Posted on Nov 09, 2014

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6 Suggested Answers

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Posted on Jan 02, 2017

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MicrowaveSvc
  • 9047 Answers

SOURCE: NN-T990SA Panasonic Microwave Stopped Heating

This model uses an inverter to produce high voltage instead of a convential transformer system. While an inverter (switched-mode power supply) is more efficient from a power consumption standpoint, it is more complex, thus more statistically prone to fail. These should only be examined and worked on by someone who has the necessary technical qualifications. Seriously. Often the machine-soldered connections in a microwave inverter are too weak, so they eventually fail, especially if heat is high in the area. They sometimes fail catastrophically. When not catastrophically damaged, you may hear clicking or squealing and may smell an electrical odor, which is sometimes obscured by the cooling fan. Some manufacturers do not encourage or assist technicians to repair microwave inverters. Most offer the inverter as a whole assembly. But sometimes that is actually cheaper than the time and labor required to fix the old one. If a technician is willing and able to troubleshoot and repair the inverter to component level, it will may be expensive, but may be worth it, especially if he or she will resolder and reinforce connections as needed as part of a thorough repair. That could easily make your inverter beter than a new one! You might be able to get some verbal estimates if you call Panasonic-authorized repair shops and ask then specifically about inverter repair and inverter replacement costs for your model number.

Posted on Dec 23, 2006

jsrock516
  • 5911 Answers

SOURCE: Panasonic Microwave

The fuse is usually a 250V 15 or 20 AMP and can be found at any hardware store. As for those screws...those are special tamper proof screws made to keep the average consumer out of dangerous appliances. There's about 4000 volts inside a microwave oven when it is energized. That's why the manufacturers don't want the average Joe tampering with it. You can, however, buy the tool required to get inside the unit for a reasonable price. I think it's less than $30 and I know Craftsman makes it. The line fuse is located on or near the input line filter board. Just follow the input power cord and you will find it. Just keep in mind, that if the fuse is blown, it usually blows for a reason. You may have other problems. Let me know if this helps you.

Posted on Jun 23, 2007

ukvacfan
  • 328 Answers

SOURCE: Panasonic Inverter NN-V673S microwave- shuts off after 2-30 secs

If the screen is showing a fault number or a number you havent seen before then its probably a program fault which can't be fixed. Check that the vent holes on the back of the oven aren't dirty and ensure that the whole oven is clean inside. Sadly it sounds like a program fault which cant usually be fixed by the owner though.
Finding a Panasonic oven repairer in the UK shouldnt be a problem though. My parents had a simlar problem wth their Panasonic Inverter oven, called the UK customer services and Panasonic contacted an authorised repairer in Scotland to visit them. Call customer services on 0844 844 3868.
If the call out charge exceeds £80 then you're probably better off buying a new oven. 



Posted on Apr 19, 2008

SOURCE: Ge jvm1650wb005

weve had our fixed before and it's the heating element $75-$100 to fix.

Posted on Sep 01, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: Panasonic nn-p295 blows buss fuse when turned on for cooking

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer. But this is likely an inverter model, so it wouldn't have one and would be some other component in the inverter I'd say.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:

http://www.microwavedisplay.com/safety.txt

http://www.microwavedisplay.com/disassembly.txt

http://www.microwavedisplay.com/doorsw.txt

http://www.gallawa.com/microtech/cap_test.html

http://www.gallawa.com/microtech/xformer.html

http://www.gallawa.com/microtech/mag_test.html

The best place to order Sharp parts is 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.

Posted on Dec 26, 2008

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HI,

Just visit this link HERE and your whole problem will be solved.
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