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I have a sharp p-651zs microwave and it does not work I opened the back and found a small switch type thing on top of of the magnetron with two wires ,it is not conected to the magnetron. Can you t

At the begining the electronic numbers were intermitant and then it went out , I opened it and found a small part on top of magnetron which has two wires looks like coming from switch and where left wire is connected it looks like melted and dark a little burned. the thing is not connected to the magnetron but screwed on top with two screws. thank you for your help.

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That is probably a thermal safety. Be glad it did not turn on with the covers removed you can cook your self very quickly unless you are trained in servicing them.

Posted on Dec 06, 2014

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Posted on Jan 02, 2017

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3 Answers

Sharp R-930CS microwave turntable stopped turning and neither convection or microwave are working (ie. not heating). Lights and fan turn on and counter counts down normally.


Look inside for one of many thermal cutouts (button type) test each for continuity (with the unit unplugged of course). Also look for burned wires and repair or replace them. If you get it running and it works fine... we're done. If it still acts up then replace the magnetron and or the capacitor.

Oct 19, 2013 | Sharp Microwave Ovens

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Light bulb has gone, can't see where it is located or how to change the bulb


Do as follows. Do not connect the microwave oven to mains while doing the following activities. Even the accidental switching ON will harm you from the microwaves. Open the top cover by unscrewing side screws & the screws at the back. Lift the top cover by tilting upwards from rear end. Remove the wave guide of magnetron & there you will find the bulb. Wave guide is rectangular small ducting (pipe enclosure) to guide the microwaves from the magnetron.

Sep 17, 2011 | Microwave Ovens

1 Answer

Hi, I have a SHARP Microwave Model R398F. Its less than a year old. The display and timer work fine but does not heat up. Can you please let me know what the problem could be. Thanks Js


If the operation is otherwise normal with the exception of heating food, common causes include; (to diagnose requires discharging of the HV capacitor) if you are inexperienced with working with HV I suggest seeking professional help.

Open thermal protectors or thermal fuses.

Open HV Diode.

Open HV capacitor

Open magnetron filament

Open winding in HV transformer

Defective HV relay

Shorted HV diode

Short or other fault in the magnetron

Short in certain portions of the HV wiring

Replacement Magnetrons (the most likely cause if not charring or defective components are found when troublshooting the small parts, can typically be had for around $45.00 just do a web search for your model number.

Good Luck

Sep 07, 2010 | Sharp Microwave Ovens

2 Answers

Sparp R 930 not heating, turntable not turning


I just repaired mine with the same symptoms. I found that the bottom microswitch on the door (there are 3 switches) was faulty. It started as open, when the door closed, the switch closed (good), but when the door was fully closed the switch was open again. I went to Electronic City with the switch in hand, they found me a duplicate that cost me $2.50. BTW - you must take out the door switch assembly, 3 screws plus wires, in order to work on the switch. Also, put the assembly back in so that the door latches close/open the switches correctly. -jk

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1 Answer

Sharp carousel microwave model # 508ak has power but does not heat food when you press the start button. thanks in advance!


9 times out of 10 this is usually this is a bad magnetron, the other time is sometimes a bad high voltage diode. See components section. Q - My microwave is running and sounds like it is working but will not heat up anything.
A - Many thing can do this but, common things are....loose high voltage wire.....poor solder joint on board.....magnetron.....power relay.....

Q - The microwave display counts down and the inside light is on, but nothing is heating and the fan is not running.
A - This most commonly is a bad door switch, other possible problems are a faulty relay or solder joint on the power module, but a bad door switch is most common.
thanks.

Jul 11, 2009 | Sharp R-510HW Microwave Oven

2 Answers

Sharp r-1481 950 Watt microwave oven problen


Found the answer by calling a Sharp technician and they said it was the magnetron tube, which is not worth fixing :( Thought I'd pass this on to anyone that has yet to find out.

Oct 15, 2008 | Sharp R-1481B Microwave Oven

2 Answers

Not heating intermediately


If you have plug-in type watt meter, you can check the power draw of the oven when it is heating and it isn't. The magnetron is the primary power consumer of the unit, and by comparing the difference of power you can tell if it is the magnetron. Most likely your intuition is correct.

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SHARP R-9H 10


first you check all high voltage section circuit and check magnetron .. check control unit also..

Oct 08, 2007 | Sharp R-1610 Microwave Oven

1 Answer

Microwave stopped working


Chances are the thermal cutout (thermal fuse) on the magnetron opened up. It may or may not also indicate a bad magnetron. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk

Aug 28, 2007 | Sharp R-202EW Microwave Oven

2 Answers

My Sharp R-340D microwave works perfectly but Does NOT HEAT FOOD


Waleed, Since the microwave is going through all its motions we can feel safe that the oven and magnetron thermostats are ok. If they were bad you would not have a display. Just inside the control panel to the left, you have 3 switches which the door activates. A primary (top switch) a secondary (bottom switch) and a monitor switch (middle). If the primary or secondary switch is not closing when the door is shut, you high voltage side will not activate, therefore no heat. If the monitor switch failed or found either the primary or secondary switch closed with the door open, it would blow the main fuse and the oven would be dead. Therefore Im leaning on either the primary or secondary switch not operating correctly. When checking these switches, unplug and discharge the capacitor. This is high voltage. Good luck

Jun 17, 2006 | Sharp R-340 Microwave Oven

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