JVM1640AB002 mfg Feb 2000, kw= 1.58 SN DZ996205S This failed with a single buzz arcing noise (buuzzzzz-IT-ARC...SNAP! sound) similar to having a piece of metal arcing in the cooking area - but no arcing in the cooking area and no metal. It arced three times, once when it failed heating, twice after a restart, each time, no heat. Now no arcing or heat. No popped circuit breakers, just does not heat. Everything else works, display, fans, lights, turntable. I have tested the door switches, they function correctly. Reseated the connector on the magnetron, checked for broken insulation on wires, tapped the on board relays a few times Where can I get a schematic to locate the HV diode and check it before I locate a new magnetron? Or, is it even worth getting a new Magnetron? I mean, these are running for about $200-$300 retail. Thanks!
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Sorry to answer so late in the game, but in case others have this problem, you can find helpful exploded view diagrams and order parts by entering your model number here: http://tinyurl.com/gv383
Posted on Sep 28, 2007
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Posted on Jan 02, 2017
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Investigate these three areas if your microwave won't heat but you hear a loud buzzing or humming noise:
Power Diode
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.
High Voltage Capacitor
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.
Magnetron
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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I found the diode, and the price for the magnetron with new diode is $150 online.
So I'll test the diode and if bad, look for the part number because that sucker with a piece of shrink wrap, a ring lug and spade lug is $50 ! Crazy ...
Gee, the buzzzzz-IT_ARC ... SNAP was probably the diode that had shorted then opened. If functioning properly, it was acting just like a fuse.
The diode is an HVR-1X3 High Voltage Diode. $0.79 from most electronic dealers, $5.00 with the ring and spade crimped on as Microwave Ovens and TV's commonly use these.
And Appliance dealers charge $50!!
With the help of this site, fixitnow.com and gallawa.com, all tests are complete, HV xfmr is fine, magnetron preliminary checks okay, capacitor okay, door switches all check out.
So it looks like the cost of the repair will be less than $5.00 and an hour of labor on a $300 appliance.
Actually when testing the diode, you need to use a megohm meter. You can not test a HV diode using a standard meter.
The diode was good after testing with a megger, HV Transformer supplied a nice arc and filament voltage, so the last thing in the basket was indeed a bad magnetron.
Magnetrons can be had for about $51 if you simple Google the part number on the Magnetron. This means some appliance stores are marking up parts in some cases 200%, with the more reputable appliance guys only marking up 25% which is a bargan considering they give phone time advice for free.
Magnetron replaced for $69, all is well.
ARCING AND SMOKING WHEN IN USE SOME TIMES LITTLE SPARKS
Two Microwaves at work failed at the same day. The keypad/display works on both units but neither unit will heat food. I took the cover off of one unit and tested the
hv diode, the capacitor, the door switches and the heat sensor on top. All were good. I visually inspected the Magnetron and it appears ok. No cracked magnets or burned insulators.
Anything else I can check?
Thanks
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