Question about Sharp R-1405 / R-140 Microwave Oven

3 Answers

Display shows nothing, microwave cuts off

I've had this microwave since late 2005 and in the last 6 months or so it has started switching off after 3, 5 or 10 seconds of the heating cycle. It has even  tripped the breaker (15 amp) a couple of times recently. This followed after the display started showing digits only partially. Now the display shows nothing and there is a click, click sound coming from the control panel every time I hit START and the micro switches off. I hit STOP, open then close the door and the micro starts "blowing" for 10-20 seconds (but it does not warm up the food) and then stops. Please help. Thank you for your time.

Posted by on

3 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer
Re: display shows nothing, microwave cuts off

Same switch problem with my R-1851A but it appears the switch was damaged by the door latch. The lower door latch is bent inward slightly and only hits half of the switch, eventually wearing off a corner of the switch's plunger. This prevents the the switch from getting fully closed without several hits on the open button. Only the lower switch needed replacing.

Posted on Aug 04, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Sharp Master
  • 8,795 Answers
Re: display shows nothing, microwave cuts off

We repair these control units for $39.95 nationwide. Usually a new one is not needed.

We have info on our service, plus critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, linked here on Fixya:

Posted on Nov 22, 2007

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has answered 20 questions.

  • Expert
  • 100 Answers
Re: display shows nothing, microwave cuts off

You need a couple of cheap microswithes that the door latches hit when you close the door and a new control for your display problem which sharp has had a problem with

Posted on Oct 31, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

I have a NNSD297 Panasonic over the range microwave oven. First the unit had power, clock , timer, fan was working; except after hit the start button, maybe 2 secs looked like working then stops operating....

Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if the switch contact are not good then it will not trigger the processor to switch on the waveguides. If the lights or fan work without any display or action of program being triggered to start then it can be a possible fault on the main board or the processor. Sometimes insect secretion can short the board and display panel and so the processor can work in such an erratic manner. If so clean, solder and reset the board. Now identify the parts by clicking this link:

If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron. Check this link to know how a microwave works:

Feb 11, 2013 | Panasonic Microwave Ovens

1 Answer

Samsung microwave displays press 1-4...

The SE indicates a short in the keypad membrane, but to cure this! the whole keypad control board should be changed if effort to resolve is decided, I would also suggest checking the pricing.

Apr 16, 2012 | Samsung SMH9187ST Microwave Oven

1 Answer

Panasonic micro steams excessivily

My NEW Panasonic microwave fills with steam then cuts out. It is (or should I say was) ventilated properly and clean, as Panasonic have had it for nearly 3 months now and I've heard nothing. My husband (who is in safety testing) so knows what he's talking about says the design is **** as there is not enough ventilation in the design. I'm waiting - still - to hear what Panasonic have to say about it

Apr 05, 2012 | Panasonic Microwave Ovens

1 Answer

Was working perfectly fine- just started buzzing when turned on and is not heating

Hello :
It could possibly be a fuse. as cheap as they are nowadays, I would recommend to replace it rather than risk taking it apart .
If it's not the fuse :
Did you switch it while there was nothing inside it lately ? Is there any error code displayed ?
good luck .
please rate !

Mar 28, 2010 | GE JVM1440 Microwave Oven

1 Answer

Switching off the sound of my Samsung Microwave

1 Press the Sound button. The display shows "ON".
("START" will flash)
2 Press the Sound button to turn the volume off. The display shows:
"OFF".("START" will flash)
3 Press Start. The display returns to the time of day.
Lastly, you can find a copy of the manual here:[GB].pdf

Sep 01, 2009 | Samsung MW1030WA Microwave Oven

2 Answers

Kenmore 721 microwave fan turns on by itself

I have the exact same problem with my Kenmore Microwave model 721 that we bought in October of 2005. The Fan will just randomly turn itself on even when we are not cooking. It has been doing this for the last few months and is starting to become more frequent. There is no way to turn it off except to unplug it for several hours.
Was there a recall for this defect ?

Apr 25, 2009 | Kenmore Microwave Ovens

1 Answer

Microwave runs fine - heats nothing

The most common causes for a lack of heating are a bad door switch, a loose connection on the magnetron, a bad magnetron, bad connection on the control circuit board, a bad relay on the board, bad high voltage diode, or bad high voltage transformer. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: We are the ones who repair the displays and control boards, by the way.

Sep 10, 2007 | Sharp R-530ES Microwave Oven

Not finding what you are looking for?
Sharp R-1405 / R-140 Microwave Oven Logo

550 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sharp Microwave Ovens Experts

William Miller
William Miller

Level 3 Expert

8795 Answers


Level 2 Expert

224 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Are you a Sharp Microwave Oven Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides