Follow the next steps , use the VOM and fix it. God bless you
Diode
The high voltage diode converts the A/C power
output of the transformer to D/C, doubling the voltage to nearly 5,000
volts. This high voltage powers the magnetron which emits the energy
that cooks the food. If the diode burns out, a lower A/C voltage reaches
the magnetron, which is not sufficient to power the magnetron. When the
diode fails it is often visibly burned out. If it appears to be good,
it can be tested with a volt-Ohm meter capable of testing diodes. High
voltage diodes frequently fail and are one of the most common points of
failure in a microwave oven. A regular meter with a diode checker will
not work to check these diodes. You have to use a meter with a 9 volt
battery or put a 9 volt battery in series with the diode to check it.
Door Switch
If the microwave does not heat, one of the
door switches might be defective. Microwave ovens normally have three
door switches, if any of them fail the microwave does not turn on and
does not heat. Check the switches for continuity with an Ohm meter.
Magnetron
If the microwave oven doesn't heat the
magnetron tube might have burned out. The magnetron uses high voltage,
high current DC power to generate the microwave frequency that cooks the
food. If the microwave oven is turned on when it is empty this can
cause the magnetron to burn out. Once it is burned out it has to be
replaced, it's not repairable.
High Voltage Capacitor
If the microwave doesn't heat the high
voltage capacitor might be defective. The high voltage capacitor works
with the high voltage diode to convert the output of the transformer to
DC voltage and to double the output voltage. If the capacitor is burned
out the entire high voltage circuit stops working properly. The high
voltage capacitor can be checked with a special VOM meter which has a
capacitance testing capability. Be aware that the high voltage capacitor
can retain a charge of more than 3,000 volts and can injure or kill a
person if not handled properly. Only trained technicians should perform
this type of testing.
High Voltage Transformer
If the microwave does not heat, the high
voltage transformer might be burned out. Microwave ovens produce a very
high voltage in order to power the magnetron antenna, which emits the
energy that cooks the food. When a high voltage transformer fails it
will usually arch and have a burning smell.
Thermal Fuse
If the microwave doesn't heat the thermal
fuse may have blown. It can be tested for continuity. Watch our fuse
testing video for more information.
Thermoprotector
If the microwave doesn't heat the
thermoprotector may have tripped. This is a safety device to prevent the
microwave from overheating. It can be tested for continuity to see if
it's blown.
Main Control Board
If the microwave doesn't heat the main
control board may be defective. This is not common. When a microwave
doesn't heat the problem is usually a faulty door switch or within the
high voltage circuit; either the high voltage capacitor, diode,
transformer or magnetron.
SOURCE: Panasonic Microwave Turn table rotates when door is open
Found this Panasonic post in the Samsung section!
If it moves just a tiny bit when the door opens and then stops, that's normal.
If it keeps running when the door is open, that's usually due to a bad door switch or broken / loose door switch mount.
If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and
disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk
Any Panasonic parts not available locally can be had here: http://www.pasc.panasonic.com/epartr
We appreciate your thoughtful rating of our answer.
SOURCE: Door shut off malfunction
I have the same problem starting yesterday April 19. Have you gotten any answers.
SOURCE: Panasonic NN- A712 combination Microwave 1000w - Switches off after 20 seconds
The 22 seconds is the giveaway.
In most cases, this is a problem with the inverter or a bad magnetron.
Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these.
I would recommend that you contact your nearest Panasonic-authorized servicer.
We're happy to help you and we'd appreciate your
thoughtful rating of our answer.
SOURCE: Microwave -- Panasonic NN-S543BFR
I would say either the high voltage transformer or a component on the inverter board has failed.
Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these.
I would recommend that you contact your nearest Panasonic-authorized servicer.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
SOURCE: top of over-the-range microwave hot to touch; normal?
A little over 100F is hotter than most folks can stand to touch, so it may not be seriously hot.
But if you're concerned, you might see if your dealer will let you test another one or a similar model at the store to see if it also gets that hot.
Otherwise, you can return it to be safe or you can contact Panasonic consumer electronics support here or at 1-800-211-7262 to ask them about it.
We're
happy to help you with free advice and we'd appreciate your
thoughtful rating of our answer.
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