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Re: No Power & No Lights
It may be a bad fuse inside or it could be blown circuit protection on the control board caused by a power surge.
The former you or a friend can fix, the latter we repair nationwide for only $39.95.
We have free service manuals available for download on our site for the Sharp R370 and R630 models which are similar types.
If you or a friend decide to work on it, we have *critical* safety and disassembly info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk
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If it worked after unplugging and reinserting, it is possible that there is a wiring problem with the plug and wiggling the wires "re-made" a connection. Try plugging in to another outlet to eliminate a dodgy outlet problem.
Most microwave ovens do have a line fuse. I can't be completely sure if your does, since you did not supply a model number. If the cover is removed, the fuse should be close to the power cord. Hope this helps you.
Your unit is dead, mains are good, tried in other receptacles, still no power. You have a bad fuse inside the unit. Unplug. Remove the cover. Generally this requires removing all the screws on the back perimeter and lifting the cover up. Sometimes they stick due to old grease, etc. Somewhere in the area of where the power cord comes in or near the transformer there should be a small fuse in a holder. It is not a glass fuse and should be replaced with the same kind (ceramic) and value. This is important for future protection. You can get the fuse at www.mcmelectronics.com . Get a box of five for future problems. If this was the only problem your microwave should work. If it blows the new fuse you could have a shorted power transformer, bad high voltage diode, or a bad magnatron in that order. There could also be a short in the board with the display but that would be unusual. Let me know if you need anymore helpl
There is a fuse inside the cover of the microwave. You will need to remove the outer shell and follow the power cord you will see an inline fuse. This fuse can be purchased at any appliance parts house.
If you have a multimeter and are comfortable with testing "live" circuits, measure to see if there is voltage from chassis ground, to both ends of the fuse, or to each wire connection on the fuse holder.If no voltage, then the problem is very likely the wall plug does not have power (could be a wire broke inside the wall box.).
If there is power, chances are there is a controller board problem. You should have seen a wiring diagram/schematic when you disassembled to replace the fuse.
Generally, you get something unless the fuse inside is blown. There is generally a fuse inside the unit when you remove the button package. First, make sure that the outlet you have is good. Plug something else into it and see that it works.