Microwave expert help needed

[centralappliance]

Working in rural areas bites at times. I have little to no experience on microwaves. Anyway I have a Panasonic model NN-SD277SR that shut down after 2 seconds It had a cooked inverter so I replaced it. Now it runs about 10 seconds then starts to short, arcing buzzing sound any chance someone can help?

[LowSL2]

Sounds like a grounded magnetron or burned waveguide.  Remove the magnetron and inspect the wave guide for any burn marks. And check the terminals on the mag for resistance to ground. Should be infinite.

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[RegUS_PatOff]

 

... microwave... Panasonic ... inverter

RUN AWAY !

[JWWebster]

http://appliancejunk.com/forums/index.php?topic=10572.msg54059#msg54059

[Wedgeman55]

Reg, I agree RUN AWAY.    When you factor in cost of new microwave vs. repair,  they almost are always better replacing.   Plus this indicates why right here in this question on this problem - When one major part goes,   it usually means multiple things have fried.   I have replaced boards to find that the mag and waveguide are bad,  then it turns into a repair that exceeds cost of new microwave.    Plus I end up getting stuck with parts or fry new parts and it costs me.

What I do is explain to them that to chase a repair like this might be costly.    I usually suggest that  if they get a new microwave,  then I can install it for them.    They get a new warranty,  and all new parts.  If this is a countertop model,  then for sure get a new one (in my opinion).    Plus if you start on one of these,   by the time you get done it's not worth your time invested.     Better to have them get a new microwave,  I then charge 125 to install one over the stove.    Way less headache.   

It was different when microwaves were in the 600 plus price range.   But now they are so cheap it's a whole different ballgame.   I do occasionally fix real top end microwaves like the convection ones by KA<  but for the most part I don't get involved anymore.   Too Much Headache.   It's also different if you work for big company like sears - you don't buy the parts like I have to so it's less worrysome about the cost of the parts you might ruin.   I have to absorb that myself.   

[Ol' Lonely]

Working in rural areas bites at times. I have little to no experience on microwaves. Anyway I have a Panasonic model NN-SD277SR that shut down after 2 seconds It had a cooked inverter so I replaced it. Now it runs about 10 seconds then starts to short, arcing buzzing sound any chance someone can help?

Did you get a chance to go back and look at it again?
What did you end up doing with it?

[centralappliance]

Its an extended warranty issue so I dont have much choice  It now hwas a new magnatron and runs for about 30 seconds then H9  and stops  This means mag or invertor or board   Wish I could run !!!!!!

[AJ]

Sounds like a tough one for sure. Thanks for the update.
At least it runs a little long each time more parts are added, lol...

Please keep us updated.