Question about Microwave Ovens

11 Answers

Microwave oven JVM240WL stopped working while in reheating mode. After that it burns a fuse after a couple of seconds of micriwaving creating a spark in a right top hollow space somewhere behind a capacity motor. What is wrong and what part shall be replaced? Thanks,

Posted by on

  • 10 more comments 
  • olegver5 Jul 01, 2009

    Microwave oven JVM240WL stopped working while in reheating mode. After that it burns a fuse after a couple of seconds of micriwaving creating a spark in a right top hollow space somewhere behind a capacity motor. What is wrong and what part shall be replaced? Thanks,

  • olegver5 Jul 01, 2009

    Microwave oven JVM240WL stopped working while in reheating mode. After that it burns a fuse every time after a couple of seconds of micriwaving creating a spark in a right top hollow space somewhere behind a capacity motor. What might be wrong and what part shall be replaced? Thanks,

  • olegver5 Jul 01, 2009

    Microwave oven JVM240WL stopped working while in reheating mode. After that it burns a fuse every time after a couple of seconds of micriwaving creating a spark in a right top hollow space somewhere behind a capacity motor (I removed the front cover above controls to get access to a fuse). What might be wrong and what part shall be replaced? Thanks,

  • olegver5 Jul 01, 2009

    Microwave oven JVM240WL stopped working while in reheating mode. After that it burns a fuse every time after a couple of seconds of micriwaving creating a spark in a right top hollow space somewhere behind a capacity motor (I removed the front cover above controls to get access to a fuse). What might be wrong and what part shall be replaced? Thanks,

  • olegver5 Jul 01, 2009

    Microwave oven JVM240WL stopped working while in reheating mode. After that it burns a fuse every time after a couple of seconds of micriwaving creating a spark in a right top hollow space somewhere behind a capacity motor (I removed the front cover above controls to get access to a fuse). What might be wrong and what part shall be replaced? Thanks,

  • olegver5 Jul 01, 2009

    Microwave oven JVM240WL stopped working while in reheating mode. After that it burns a fuse every time after a couple of seconds of micriwaving creating a spark in a right top hollow space somewhere behind a capacity motor (I removed the front cover above controls to get access to a fuse). What might be wrong and what part shall be replaced?
    Please note that wiring seems OK as well as other components and contacts, at least there is no visible damages or signs of ware. This microwave was perfectly functioning before it stopped working (and blowing a breaker first and then a fuse) during microwaving. Thanks,

  • olegver5 Jul 01, 2009

    Microwave oven JVM240WL stopped working while in reheating mode. After that it burns a fuse every time after a couple of seconds of micriwaving creating a spark in a right top hollow space somewhere behind a capacity motor (I removed the front cover above controls to get access to a fuse). What might be wrong and what part shall be replaced?
    Please note that wiring seems OK as well as other components and contacts, at least there is no visible damages or signs of ware. This microwave was perfectly functioning before it stopped working (and blowing a breaker first and then a fuse) during microwaving. Thanks,

  • olegver5 Jul 01, 2009

    There was no power surge or lightning strikes lately. Micriowave blew a breaker after appr. 2 min of work. It keeps burning fuses (3 so far) without blowing a breaker now. Can this be bad magnetron?

    If your assumption with the main transformer is correct what the next step you would suggest?

  • olegver5 Jul 01, 2009

    Microwave oven JVM240WL stopped working while in reheating mode. After that it burns a fuse every time after a couple of seconds of micriwaving creating a spark in a right top hollow space somewhere behind a capacity motor (I removed the front cover above controls to get access to a fuse). What might be wrong and what part shall be replaced?
    Please note that wiring seems OK as well as other components and contacts, at least there are no visible damages or signs of wear. This microwave was perfectly functioning before it stopped working (and blowing a breaker first and then a fuse) during microwaving.
    There was no power surge or lightning strikes lately. Micriowave blew a breaker after appr. 2 min of work. It keeps burning fuses (3 so far) without blowing a breaker now. Can this be bad magnetron or something else like the main transformer?
    What the next step you would suggest?
    Thanks,

  • olegver5 Jul 01, 2009

    I assume you refer a capacity motor as to capacitor (please confirm). Also clarify what article you mean.

    Thanks,

  • olegver5 Jul 02, 2009

    Please clarify - are there two capacitors, one in the system board and another in the power supply, or you just indicated possible location of one?

  • olegver5 Jul 06, 2009

    Thank you PCmania. Looks like you were correct saying that the problem was with diods. Apparently there is also a burned transitor. I have two questions in this regard:

    1. What coused diod and transitor to burn? If they are replaced whould this problem occur again?

    2. How can I identify diod and transistor?

    Thanks,

×

11 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 790 Answers

Hi

in this case you have defective regulated power supply and we are looking for a shorted spare parts try this method.

1. check the transformer if shorted, if shorted replace a new one.
2. check the rectifier diode maybe this is shorted, if shorted replace a new one
3. check the Capacitor maybe this is shorted,.
4. check the power transistor regulator check if shorted. if shorted replace a new one

this spare parts above is in power section semiconductor spare no other just concentrate at the power section..

Thanks!

Posted on Jul 06, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 813 Answers

Try a slightly higher rating fuse. Check the voltage output from the wall socket - it might be higher than specified.

Posted on Jul 02, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 11,896 Answers

There is a burnt capacitor either on the system board or in the power supply that is sending out to much voltage. THe capcitor will have to be tested and possibly replaced.

Posted on Jul 02, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Genius:

    An expert who has answered 1,000 questions.

  • Master
  • 1,847 Answers

Check the door switch as described above. The capacitor or diode may be bad. Discharge the capacitor as described earlier in the article. Test the capacitor by removing the leads and setting the VOM to RX100. Probe the terminals. The reading should start in the low ohms and increase toward infinity. Reverse the probes and re-test. The reading should do the same thing. If not, it's bad. To test the diode, disconnect the diode from both the appliance and the capacitor. With the VOM set to RX100, probe the wires. Then reverse the probes and read again. You should get infinity for one reading and low ohms for the other reading. If not, replace. Another cause could be a faulty magnetron, but due to the sensitivity of that piece, it's best left to a professional.

Thanks
Kindly rate the answer
Kevin

Posted on Jul 01, 2009

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

    Sergeant:

    An expert that has over 500 points.

  • Expert
  • 353 Answers

Sounds like a short in the main transformer.
had any power surges or lightning strikes lately

Posted on Jul 01, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,952 Answers

Although the carousel is usually driven by a small motor that's unrelated to the heating function of the microwave, the microwave cabinet needs to be opened to repair it. So we recommend that you seek the assistance of a qualified appliance repair technician. Inspect the plastic drive coupling that the tray sits on, as well as the ring-and-roller assembly, to make sure that they're working properly.

I have intermittent cooking problems Many over-the-range microwave ovens suffer from intermittent problems caused by excessive moisture from the range/stove entering the microwave cabinet and collecting on the circuitry. Often the problem is with one or two simple connections that may need tightening or soldering. But, to repair these components, the microwave cabinet needs to be opened. So we recommend that you seek the assistance of a qualified appliance repair technician.

Posted on Jul 01, 2009

  • 1 more comment 
  • mohammed marika thambi
    mohammed marika thambi Jul 01, 2009

    If the wave guide has any burn spots, replace it and clean the unit well.

  • mohammed marika thambi
    mohammed marika thambi Jul 01, 2009

    replace plastic drive coupling that the tray sits on, as well as the ring-and-roller assembly

  • mohammed marika thambi
    mohammed marika thambi Jul 06, 2009


    • Make sure that the microwave is plugged into a grounded outlet. It must be a 3-prong outlet.


    • Make sure the clock is set.


    • Check to see if a programming sequence was entered.
      Sometimes improper programming or a program sequence such as delay
      start can cause the touch panel to be non-responsive. Unplug microwave
      or turn off house circuit breaker for 30 seconds. Plug back in, or
      reset circuit breaker, and try reprogramming unit.


    • Check the house circuit breaker or fuse box. If the microwave is DEAD and there is no display and nothing works- the problem could be a blown fuse or tripped breaker.
    When using a power level other than HIGH or
    10 the magnetron tube cycles on
    and off to obtain the lower power. This cycling of the magnetron tube causes this dull
    thumping, pulsating, or humming noise.
    When combination cooking in microwave/convection models, the cycling of the convection
    element and fan will alternate continuously with the hum of the magnetron and the fan.


×

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 749 Answers

The appliance may not be earthed, open the plug and have a look at the wires, check to see if they are correctly connected especially the top green yellow earth wire.

Posted on Jul 01, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 3,230 Answers

Hi there,

Nothing to change, first of all check all the wires connected properly to the control board and heating element. 
problem occurs due to some short wire in oven.

Please do rate this solution.
Good Luck!!
Thanks

Posted on Jul 01, 2009

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Expert
  • 942 Answers

Hi, maybe the power section is defective like bridge Recifier Diode is shorted,. and the buss motor is defective also because of blunt capacitor, you just try to click the link below

http://www.repairclinic.com/0088_6_1.asp#Level1_6

Goodluck!!!

Regards

PCmania

Posted on Jul 01, 2009

  • Neciforo Llanto Jul 02, 2009

    Hi..

    you have just need to repair and replace the shorted diode you just refer to the site below

    http://www.repairclinic.com/0088_6_1.asp...

    Goodluck!!

    Regards

    PCmania


×

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 10,515 Answers

Hi,

There is an article by an expert ;-

A small amount shouldn't do any harm. But microwaves can not go through metal (including gold and silver). When they hit the metal, they are reflected, just like light off a mirror. If there is only metal inside the microwave, this is even worse than running it with nothing inside, because the microwaves will be reflected right back into the parts of the microwave that will be damaged. Also, if the metal has sharp points or bends or odd things about its shape, you can get sparks or arcs of electricity between two points on the metal. This can cause the microwave to catch on fire.
Needless to say, your food won't be heated in a close metal object either...

WHICH FOUND CONTAINER HAVE YOU USED TO REHEAT?

Sparks can result from left over food particles that got carbonized, and a good cleaning might get rid of it, unless you like looking at the sparks(I heard you shouldn't stare at a microwave while working though, washing machines are safer).

Make sure you unplug it while cleaning or doing anything else, those micros are dangerous as hell.

he job of the waveguide cover is to protect the waveguide (opening) and the magnetron from buildup of food particles and grease.

When the grease and food particles build up on and below the cover, they will carbonize and arc - and maybe even flame up!

The solution is to clean it and keep it clean - but if it's too dirty, it must be replaced.

Sometimes it's necessary to remove the cover to clean both sides of it, and to clean the edges of the opening it covers.

It is held in place with a small plastic rivet (or screw) and once that is removed, the cover will slide over a little then drop down.

Be VERY careful not to get cut on the potentially sharp edges of the opening, and do not spray anything into the opening.

Apply an alcohol-based cleaner (such as the purple kind) and /or gentle scouring powder to a cloth or paper towel and carefully wipe it out, then when it's dry, reinstall the cover and the rivet.

I suggest to my customers that they NEVER use any ammonia-based cleaner (like the blue stuff) on a microwave, since the amonia will crack and distort polycarbonate plastics.

As we are not there,we have already made an intelligent guess what might be the reaosn for spark. I would advise you to call tech to check the hole behind the capacity motor. Life is not more than Money.There might be million of reasons and to be frank you would agree!!!!

Hope i helped you.

DO RATE THE SOLUTION.

Thanks for using "Fixya".

Posted on Jul 01, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,383 Answers

Ok there is your fuse conductor is gone.

But check diode register and transistor on circuit bord.
If you find any blown diode , Transistor or Register then replaced it.

Posted on Jul 01, 2009

  • kishor
    kishor Jul 01, 2009

    change only fuse then check .

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Panasonic NN-H965WF Microwave oven


We recommend the microwave is evaluated by an authorized service center by using www.panasonic.com/repair Welcome to Panasonic Online Repair

Apr 13, 2014 | Panasonic Microwave Ovens

1 Answer

Genius S333 refer to manual error after 3 seconds


If microwave runs only without turn table, I am suggest to check if turntable electric motor has got short circuit. If yes, I have some left.

Nov 13, 2013 | Microwave Ovens

1 Answer

Microwave made a pop noise and just stopped working? itys not respoding at all?


If there is spark please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is leaking and sparking to the ground. As you have mentioned it was stored, it is 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.
So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off.
Now switch the microwave power on and use a cup of water to test.
If you notice any sparks shut off as the magnetron or the main HT capacitor can be faulty. Replace with same type. If not check the waveguides within the cabin for food particles that can burn and spark, check for rust that can corrode and spark when the ceramic paint has worn out.
If there is heating without any issues, you can use the microwave safely

Click on replacing waveguides: http://www.espares.co.uk/advice/microwave/a/5/1146/how-to-replace-a-microwave-guide-cover.html

Feb 12, 2013 | Microwave Ovens

1 Answer

My Panasonic Microwave Stops Shortly after I start it. Why?


If there is spark please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is leaking and sparking to the ground. As you have mentioned it was stored, it is 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.
So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off.
Now switch the microwave power on and use a cup of water to test.
If you notice any sparks shut off as the magnetron or the main HT capacitor can be faulty. Replace with same type. If not check the waveguides within the cabin for food particles that can burn and spark, check for rust that can corrode and spark when the ceramic paint has worn out.
If there is heating without any issues, you can use the microwave safely

Click on replacing waveguides: http://www.espares.co.uk/advice/microwave/a/5/1146/how-to-replace-a-microwave-guide-cover.html

Feb 01, 2013 | Panasonic NN-P295SF Microwave Oven

2 Answers

My sharp microwave just stopped working. It


IT IS POSIBLE TO HAVE A BURNED FUSE ON THEI Main boARD OF THE OVEN

Feb 14, 2010 | Sharp R-1480 Microwave Oven

1 Answer

MY SAMSUNG MW6574W OVEN FUSE BLOWS AFTER 4-5 MINS OF REHEATING-NO SMELL OF BURNING -EVERYTHING ELSE WORKS FINE- NO LOOSE WIRING-ALL BULBS WORK FINE TOO- THE FOOD HEATS UP FINE EXCEPT THAT THE FUSE BLO


the insulation of the wiring has detiorated and with temperatue rising it further deteriorates. thus increasing the current consumption and blowing the fuse

May 21, 2009 | Samsung MW6575G/MW6574W Microwave Oven

1 Answer

Microwave quit working after a few seconds......


check if door is closed tightly those hooks on the door activate switches which close the circuit .if not open cover and check contacts on switches

Mar 07, 2007 | GE JVM1440 Microwave Oven

Not finding what you are looking for?
Microwave Ovens Logo

Related Topics:

259 people viewed this question

Ask a Question

Usually answered in minutes!

Top Microwave Ovens Experts

William Miller
William Miller

Level 3 Expert

9047 Answers

Devabhakthuni...
Devabhakthuni...

Level 2 Expert

225 Answers

yadayada
yadayada

Level 3 Expert

75824 Answers

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

Answer questions

Manuals & User Guides

Loading...