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Question about Sharp R-1200 Microwave Oven

2 Answers

No Power & No Lights

I have power at my 110 outlet, disply not working, no power and no lights. Can this be a dead fuse inside?

Posted by Anonymous on

  • Anonymous Mar 01, 2007

    20 amp fuse ok and there were no power surges. I was reheating some food and went to check it resttarted cooking time and nothing happened, it has no lights and the display is dead. Any ideas?

  • Anonymous Mar 29, 2007

    Thanx MicrowaveSVC, it was the powerboard. I will keep you in my favorites!



2 Answers


Thanx, it was the power board! Will keep you in mind.........

Posted on Mar 19, 2007


William Miller

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  • 9,179 Answers

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:

Posted on Feb 28, 2007

  • William Miller
    William Miller Mar 01, 2007

    Sure. It may have a blown thermal fuse on the magnetron. If so, you can replace that.

    Also check the varistor on the power board. If it's bad, replace it.

    Lastly, check the fusible trace on the power board. If it's blown, then either install a wire jumper or an RF choke, whichever you prefer.

    The first one could be bad due to overheating.

    The last two could be blown due to a tiny surge you don't know about that may not have affected any other devices.

    It's all covered in the service manuals I mentioned.



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Related Questions:


The control panel of microwave dead. No lights on the panel. There is power to the outlet

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.

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Blown fuse inside of unit. Must find out why fuse blew, something shorted or bad connections.

No power... No lights or Fan. The 110 outlet has power. I tested it. The display is blank. I have unplugged the microwave but I had the same results. Is there a fuse in the microwave?

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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 . 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


Thanks for using FixYa

RCA Model RMW700 micorwave 1 yr old stopped working. No power, yet the outlet is live. No power to the display, no light inside, just dead. Stopped working when heating cold cup of coffee.

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HI, there is a inline fuse located inside the microwave ion the power supply board. check for continuity. replace the fuse if necessary. if the fuse is OK, replace the power supply board.

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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.

Sharp Carosel R-1481 (no B) & 950 Watts

All MW has a fuse inside to protect the circuit board
Try to replace the fuse

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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.
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