Question about Panasonic NN-T990SA Microwave Oven

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Panasonic Inverter Microvave (NN-T990SA) Does Not Operate at Full Power

My Panasonic Inverter has operated great until today. It seems to not be able to heat at full power. It took over 5 minutes to bring a cup of water to a boil. According to the display on the key pad it is operating at full power. I would like to know if this is an easy fix or is it time to go buy a new microwave. I bought it in 2001 so all warranty coverage is gone. Let me know what you think about my situation. Thanks

Ed

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  • 9,098 Answers

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:

http://www2.panasonic.com/webapp/wcs/stores/servlet/vServiceLocator?storeId=15001

We're happy to help and we appreciate your thoughtful rating of our answer.

Posted on Dec 17, 2007

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1 Answer

Panasonic NN-T990SA mfg 2002 Door opens, tray continues to spin-light on-fan on--not cooking.


call the toll free number for the product, service centre might assist, I would not use until fixed

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Jul 01, 2009 | Panasonic NN-T990SA Microwave Oven

1 Answer

Turns off after 3 sec


Usually this indicates failure of the magnetron and/or the inverter. Neither is easy to test without specialised HV equipment. Often the cause is operating the oven without anything in it. If this has happened, it will generally be failure of the magnetron.

Replacement of the magnetron is relatively easy (about 15 minutes) and the inverter a little longer but if you do not have the knowledge/skills please do not do it - there are very dangerous (deadly) voltages associated with magnetrons even after they have been switched off.

Cost of magnetrons ranges upwards from USD25 to USD100 (from Panasonic spare parts) and inverters range upwards from USD125. The cost of parts is often the reason microwave ovens are not repaired.

Doug

Nov 05, 2008 | Panasonic NN-T990SA Microwave Oven

1 Answer

Panasonic microwave 1200


This model uses an inverter to produce high voltage. That symptom is an usually indication of a problem with the inverter or a bad magnetron. I do not recommend that a person without training and experience ever work on these models. You should be able to locate a Panasonic-authorized servicer here: http://www.pasc.panasonic.com/WhereTo/FindServicer.asp?Pass=1 I would mention the exact symptom when you call so the technician can bring a new inverter with him when he comes out to repair it. Might save you having it pulled into the shop. Good luck!

Sep 19, 2007 | Panasonic NN-T990SA Microwave Oven

1 Answer

Microwave stopping working


In this one, the most likely causes are the inverter or magnetron, but it really will need an experienced troubleshooter. Due to the lethal voltages involved, I do not recommend that a person without training and experience ever work on these models. You should be able to locate a Panasonic-authorized servicer here: http://www.pasc.panasonic.com/WhereTo/FindServicer.asp?Pass=1 I would mention the exact symptom when you call so the technician can bring a new inverter with him when he comes out to repair it. Might save you having it pulled into the shop.

Sep 13, 2007 | Panasonic NN-T990SA Microwave Oven

3 Answers

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.

Dec 21, 2006 | Panasonic NN-T990SA Microwave Oven

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