Question about Panasonic Microwave Ovens

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Panasonic NN-A574S microwave trips power when plugged in, earth to neutral short at 134ohm with earth disconnected micorwave wil not power up, case is not live, was cooking poataoes when it failed, internal boards do not show signs of blown components and when removing case earth bonds internally I cannot fine one that removes the earth leak? any ideas where to look, what to replace first?

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You may have a faulty door switch. 1 of 3 switches is a direct short switch which protects the user from an open door scenario.You could also have a shorted H.V. capacitor. Use caution as a severe shock injury could occur.

Posted on May 24, 2008

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

Door switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

Earth and neutral are tied together in your breaker box, so they should read virtually zero anyway.

The 134 ohms you're reading is probably from line (hot) to neutral and it's probably the normal resistance of the primary low voltage transformer on the control board. Unplugging the power connector to the board then measuring again would tell you that.

We have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

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

Posted on May 24, 2008

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