Question about Panasonic NN-H764 Microwave Oven
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Posted on Jan 02, 2017
SOURCE: microwave oven problem
My microwave oven makes my cups and dishes so hot they can't be touched . The dish is much hotter than the food or beverage inside .
Do I have a defective microwave ?
Posted on Sep 17, 2008
An IGBT is an insulated gate bipolar transistor - sort of a hybird between a bipolar transistor and a MOSFET.
These are the final output driver transistors in the high-voltage inverter.
If it stops after 7 seconds, it still has a problem with the inverter.
It's likely a bad transistor, an electrolytic capacitor with an internal short or bad ESR or altered value, bad connection on the inverter board, a shorted diode or blown resistor, or a bad connection in the wiring.
Reputable service centers will have a repair warranty, but it may only be 30-90 days.
Due to the lethal voltages used and produced in inverters, I do not recommend that an inexperienced person work on these.
You should use a Panasonic-authorized service center so they'll have the service manual and (hopefully) experience and training to repair inverters.
In the US, you can find an authorized Panasonic servicer here.
This sounds like a non-US model. If so, visit panasonic.net, find your home country, then find the service / support links.
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Posted on Feb 15, 2009
SOURCE: Tripping circuit
You don't say how long this has been going on; I'm going to presume it's a recent development.
Several possible scenarios come to mind. I'd first look around and see if any other appliances have been connected to that circuit. In my area (Minnesota), the electrical code requires that microwaves have their own dedicated circuit and breaker; if this is not the case, you need to see what else is competing with your microwave for that breaker's power supply.
One other possible cheap fix - in case the breaker is defective, try swapping out the breaker in-question for another of the same rating (DO NOT, repeat, DO NOT put in a bigger/higher-rated breaker without having a qualified electrician OK it). If this isn't the problem, it never hurts to have a spare circuit breaker on-hand. Might even be able to switch around with another of the same rating, just understand that you'll lose power to both circuits for the duration of the test.
If it's on it's own dedicated circuit, then it's likely the oven itself with an internal short of some kind. Because I don't know your level of skill in dealing with 110V AC electricity, my recommendation is that you have someone qualified open it up and start checking short-circuits with a multi-meter, observing all safety precautions.
If you've isolated the problem to being the oven, and it's going to cost more to troubleshoot than replace, you might be able to cut a deal by trading-in your old oven against the new one - - if the shop you buy from has quailfied repair people on-staff, they might be able to refurb and re-sell it used.
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Posted on Feb 21, 2009
In all likelihood the mangnetron has failed, or perhaps even the Power Supply. or a fault that is shutting the system down for safety reasons You need to have it serviced by a reputable service centre/man. Ensure you get a firm "Quote" before proceeding, and remember these days the cost of repair can equal or exceed the price of a new one.
Service manual below, troubleshoot with that. http://www.eserviceinfo.com/downloadsm/5734/PANASONIC_NN-K652.html
Posted on May 04, 2010
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