Replaced fuse
Do you have something plugged in to the same outlet? this can blow the fuse.
SOURCE: Panasonic Dimension 4 microwave model
A microwave can be dead for many reasons.
It may be the fuse, which is usually located 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.
When
checking thermostats, if it has a hood fan thermostat, that should read
open, as opposed to the others, which should read closed.
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.
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.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
SOURCE: Hi, I have a NN-C784MF
Chances are there are other bad parts blowing the diodes, most likely a MOSFET.
Also, the ESR of the electrolytic capacitors should be checked and all board connections must be checked and resoldered if suspect.
If you're not experienced in troubleshooting switched-mode power supplies (inverters) then you can probably save a lot of timer and money by replacing the whole inverter.
You can find the nearest spare parts supplier by selecting your country then the support links at Panasonic.net.
We're
happy to help you with free advice and we'd appreciate your
thoughtful rating of our answer.
SOURCE: Terminal connector to the door switch overheated & fuse blown
Just cleaning is not enought.The terminal is loose and that isusually the problem most of the time.Replace them with new ones and I think you be happy.
SOURCE: Panasonic NNA554W blows 10a fuse when microwave comes on
Possibly the interlock monitor switch is bad or out of adjustment. This switch is designed to create a short circuit across the power line (and then blow the fuse) if you attempt to defeat the door interlock and operate the oven with the door open. A shorted capacitor or diode could also cause the fuse to blow. Because of lethal voltages inside and the possibility of microwave leakage if repairs aren't done correctly, you are best off leaving microwave service to professionals.
SOURCE: Internal ceramic fuse repeatly blown.
If it went dead almost
immediately after pressing the Start pad, that's usually a shorted
high-voltage capacitor.
If it went dead
several seconds after pressing the Start pad, that's usually a
failing
high-voltage transformer.
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. See: http://www.microwavedisplay.com/doorsw.txt in this case.
If this unit has an inverter some parts are difficult for the average do it yourselfer to replace, such as parts which are spot welded, not using removable connectors.
In such cases, it's best to replace the entire inverter.
Due to the lethal
voltages used and produced in inverters, I do not recommend that an
inexperienced person work on them.
You can find an authorized Panasonic servicer here.
In Canada, you can find an authorized Panasonic servicer here.
You can find an authorized Panasonic servicer here.
You can order
Panasonic parts from Encompass or by
calling 866-779-5835.
We're
happy to help you with free advice and we'd appreciate your
thoughtful rating of our answer.
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