Question about GE Spacemaker JVM1640SJ Microwave Oven
This is typical of a failed magnetron: the part which actually supplies the microwaves.
By their very nature magnetrons can fail without warning from the day of manufacture but the vast majority do last longer than the manufacturer's warranty. I have noticed a trend towards more frequent premature failure with increasingly powerful ovens.
If the magnetron has failed then there is nothing you can do to fix this as it must be replaced (along with a new mesh collar). It's also typically the most expensive single component in most ovens so is rarely an economic repair. On your oven it's part number 56324A.
Your appliance might still be within the manufacturer's warranty so you should follow their advice regarding getting the oven repaired.
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Posted on Nov 12, 2009
If it lights up and the fan blows (you hear noise), then you most likely have trouble in the magnetron or it's power supply. UNPLUG unit, remove case and check to see if there is a separate fuse for the magnetron. If not, or if it is okay, is there evidence of parts burned (smell or visual)? With an ohmmeter, test the diode, capacitor and magnetron. With the magnetron disconnected, you should see very low resistance pin to pin (the filament), and very high resistance either pin to ground (the "tube"). If the magnetron is bad, replacements are available online (search using numbers off the magnetron). I hope this is helpful to you.
Posted on Nov 12, 2009
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Posted on Jan 02, 2017
Tips for a great answer:
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Investigate these three areas if your microwave won't heat but you hear a loud buzzing or humming noise:
A diode is an electronic component that readily
passes current in one direction only and blocks the flow of current in
the opposing direction. If your microwave's diode has become defective,
your microwave will not heat and you will hear a buzzing noise. Test the
diode to determine if this is the cause of your problem. Replace it if
it is defective.
A capacitor is an electrical device which stores
electricity. A defective capacitor may be why your microwave is not
heating but you are hearing a buzzing or humming noise. The capacitor
will have to be tested to determine if this is the cause of your
problem. A defective capacitor will have to be replaced before your
microwave will work again. Make sure you discharge the capacitor before you test it, though.
A defective magnetron is the third possible cause of
why your microwave is not heating, but you can hear a buzzing noise.
Test your microwave's magnetron. Replace it if it is defective.
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