Question about Microwave Ovens
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Posted on Jan 02, 2017
Hi,It is most likely the magnetron and diode that has to be replaced. This job should be done by a tech, High voltage. Magnetron's normally have a five year warranty, check your owners manual.
Posted on Mar 20, 2009
Sounds like you just fried your magnetron. Normally when they go bad, they make a very loud noise like what you described. The smell concerns me because you may have ruined the waveguide as well. If the magnetron burns through the protective painted surface of the waveguide, the waveguide is ruined. In most microwave ovens this means replacing the entire unit because the waveguide is not replaceable. Putting a new magnetron in a damaged waveguide will result in the same arcing and eventual failure. In addition to the magnetron, the following components are part of the same high voltage network: HV Transformer HV Diode HV Capacitor Magnetron Thermal Cut-Out Any one of these components could have also been damaged. I DO NOT recommend taking any voltage measurements inside the HV network. Potentials of over 4000 volts can be reached and make it very dangerous for the do-it-yourselfer. Taking resistance readings with the unit unplugged is strongly encouraged. If you decide to pursue a repair, inspect the magnetron tip and inside of the waveguide first. If the magnetron is melted and/or there are burn marks inside the waveguide, a new microwave may be a in order. This actually may be a better option than an expensive repair. I hope you find this advice helpful.
Posted on Jul 31, 2007
SOURCE: GE SPACEMAKER JVM1650
When door open the microwave should not work at all, if the turntable and light come on with the door open , if they do , then this is an additional problem with door switch and must be fixed.
Regarding humming noise and no heath, Test the high voltage capacitor, the rectifier diode.or the magnetron.
If it additionally does not spin and no light, then check also the door switch.
The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.
All locations, and description of this parts can be located using the diagram here: Counter top.
Parts must be tested to find out what is wrong.
Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.
Regarding parts, contact the seller here to purchase parts. (here in UK).
Posted on Apr 27, 2009
Microwave ovens have a diode stack, usually made up of HV Diodes sometimes only 1, if there is 2 one will sit between the 2 connections on the hIgh Voltage Capacitor which sits at the back usually right hand side to the right of the transformer, WARNING: before doing anything, the Oven must be unplugged and the capacitor shorted to earth, unplug one side of the diode and using a multimeter check for short, it should read virtually open circuit, if there is a problem with it it will show a low reading regardless of the polarity of the probes, there is another diode that sits between the HV Capacitor and the oven case (earth) do the same with that, if either read low, replace, then using the multimeter and test between the two connections of the HV capacitor, if reading id low, replace, then check the connections on the Magnatron to earth, not to each other, read should be open circuit any reading, it needs tro be replaced. Hope that helps...Phil
Posted on May 19, 2009
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Hello kjerickson22 - I am happy to assist you. However, what exactly is your concern or issue the microwave is experiencing? What is the model number? Will the light not turn on or off? With this information I can better address the issue at hand. Thank you.
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