Question about GE Spacemaker JVM1640SJ Microwave Oven

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Micro wave oven dead no power is there an nternal fuse or breaker?

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  • GE Master
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It is seldom that easy, In all likelihood the mangnetron has failed, or perhaps even the Power Supply. You need to have it serviced by a reputable service centre/man. Ensure you get a firm "Quote" before proceeding, and remember these days the cost of repair can equal or exceed the price of a new one.

Posted on Feb 01, 2010

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  • GE Master
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See my detailed post here.


Posted on Feb 12, 2010

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1 Answer

Why would my kenmore micro wave model 721.66463500 just go dead, no power


There may be a weakened connection around the main power supply 'Transformer'. Sometimes the connections can overheat but if they are removed and replaced it may again make contact. I've had a similar problem and found parts from similar brands to replace the connecting/wiring parts. I soon realized that I could have removed the extra pieces around the wires without causing any electrical problems. That is the minor repair. The major repair would be to replace one of the main features (large or small) which assist the transformer in power functions. Take your time examining the tiniest parts and pieces.

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Where are the fuses in my microwave oven,?


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The circuit breaker to the micro wave was tripped and when reset the microwave did not work it just hums also the lights and fan does not work. What's up with that?


the hi voltage transformer is still operating, but the rest is dead, you could remove outer cover and see if there are 2 fuses, most only have 1 fuse, sounds like new microwave time

Oct 09, 2009 | Microwave Ovens

1 Answer

No power. but it is pluged in and checked breaker


Try plugging a lamp intothe same socket and see if it comes on if it does the fuse in the micro wave has blown but there are up to 5 fuses on some models so I need a model and serial number to help you fix the problem.

Sep 28, 2009 | Sharp Microwave Ovens

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Model #MMV5100AAB built 01/2002 no power


Check the back panel for a breaker reset. If none, remove the case cover (pull the plug) and look for any blown fuses. If look ok, then check the interlock switch(es) for function when the door is closed. They are micro-switches and should make a distinct 'click' when operated. If you find a blown fuse, replace the high voltage diode in the magnetron power supply and replace the 'stirrer' (a fan-like device located under the sheet metal wave guide where the microwave energy enters the cooking cavity). It has a plastic bearing that can arc across inside it and short the energy out.

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This oven does not operate any longer.


TAKE OFF THE CABINET AND LOOK FOR A FUSE THAT IS MORE LIKELY GREY AND MADE OF CERAMIC IT IS SHAPED LIKE THE OLD GLASS AUTO FUSES. NO VISUAL (GOOD OR BAD) MUST BE TESTED WITH OHMMETER FOR CONTINUITY

Apr 28, 2009 | Whirlpool MH2155XP Microwave Oven

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We had a bad power surge during a storm last week which fried my Panasonic NN-T990saf. My question is it worth trying to get it repaired or should I just buy a new micro wave?


Although lightning damage is normally fatal to anything with electronics inside, you might remove the back panel and look for fuse holders. If you find one (minimum) or two (likely), replace them (if you have a cheap multimeter you can check for continuity) and see  if it will turn on. You may have to do a little telephone work to locate the high current fuse which is probably 30 amps.  
If you live in an area of frequent lightning strikes, investing in a 'whole house' surge arrester makes sense. These are installed in the main breaker box and any brand I've seen comes with a $10-25,000 insurance policy to replace any dead appliances that fail despite the surge protector. They cost $150-250 US plus installation which you can save if you are afraid to DIY.     

Feb 23, 2009 | Panasonic NN-T990SA Microwave Oven

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Sunbeam SMW5500 micro/convection oven shorted out when opening door


You are decribing a typical Door Safety Switch problem. The Door Safety Switches has Failed.The Door Safety Switch is designed to shut down the Micro in the event the Micro is still cooking when the door is being opened. The first "Click" of the switch cuts off the "Cook". If it does not cut off the "Cook", the second "Click" blows the power. Otherwise it would "Cook" with the door open, and I need not to tell you how DANGEROUS that could be. It first Tripped the Circuit Breaker which supplies power to the Microwave. After Re-Setting the Breaker the same thing happened except this time the Micro is DEAD- not even a light working. Yes, there is a line FUSE inside the Micro. You however need to address the Door Switch SHORT before replacing the fuse. If not, it will just Blow The Fuse Again, and Again, until the Short is corrected.
Call around, ask How much to replace a Door Safety Switch.
Good Luck!

Feb 15, 2008 | Microwave Ovens

2 Answers

Dead micro


It could be a bad in-line circit breaker fuse. Unplug the microwave and take the outside cover off. Look for the in-line circuit breaker fuse. Use a plastic fuse puller (not your hands or a metal tool as there is still voltage stored in the microwave even when it is unplugged). Look at the fuse and see if it is blown. (The metal wire running length of tube will be broken. If you have one, test with an Ohmmeter.

Jun 03, 2007 | GE Spacemaker JVM1640SJ Microwave Oven

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