Question about Panasonic Microwave Ovens
Microwave did a funny noise, kind off a spark noise then, went completely dead. No digital display either. Plug has power. Is there an internal fuse? If it is, how to replace it?
A microwave can be dead for many reasons.
It may be the fuse, which is usually located behind the grille or on the floor of the oven behind the control panel or between the door switches.
If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.
If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.
Then when it cools, it closes the circuit and allows power through again.
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.
You should also check the high voltage rectifier diode to be sure it's not shorted too: http://www.gallawa.com/microtech/diode.html (if it is NOT shorted, it's probably fine)
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 it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.
You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.
If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.
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.
You can find an authorized Panasonic servicer here. You can order Panasonic parts from Tritronics, but if you don't find what you're looking for there, try here.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Nov 07, 2008
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