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!
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 ...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!!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.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.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.
AnonymousMar 26, 2014
ARCING AND SMOKING WHEN IN USE SOME TIMES LITTLE SPARKSARCING AND SMOKING WHEN IN USE SOME TIMES LITTLE SPARKS
AnonymousApr 01, 2014
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?
ThanksTwo 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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9,179 Answers
Re: No heat - where is the diode
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
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You may have failing magnetron or shorted high voltage diode, but on some models, it is a failing capacitor on the controller.
We would need to know the full model number from the tag in the cooking cavity or elsewhere on the microwave, such as the door frame, controller frame, etc.
Please post a new help request with that and more detailed symptoms.
The magnetron is getting to hot and will eventually fail, especially when it is arcing, "a safety issue convern" the cause is the part mentioned above, or there is exposed metal on the inside cavity.
Sounds like a problem in the high voltage side. Need to check the diode and if good the voltage at the magnetron. Should be 3.5 volts across mag and 4500 dc volts at mag. If you do not have a meter to check replace both mag and diode aprox $150.00 from GE. Pat
hELLO THERE when a microwave quits heating but every thing else is ok normally investigate these 4 areas
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.
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.
When the micro starts arcing it is reasonably serious. One or more of the components are broken down. What needs to be done is firstly, "pull the plug out" The cover needs to be unscrewed and removed. You will then see the electrical components on the R.H.Side. There is a magnatron (creates the heat).and a capacitor (discharge voltage) and a HV diode. (DCcurrent to charge the cap). The magnatron needs to be replaced, and the HV diode. Please do not do it yourself as there are lethel voltages sitting there waiting for a wrong move. A technician needs to do the repairs as he has the appropriate tools to discharge the cap and do relative tests.
You should have no arcing within the unit. Assuming you have adequate food/water in the cavity, it should not arc. You NEVER run the unit without something to be heated in it!!!
You might check the stirrer fan which is often in the roof of the unit to see if contamination might be in the area causing arcing. The electric fields in th area are very high and arcs can jump.
If the insulating window is charred or has charred grease, it should bbe replaced.
could be several possible components at fault. how old is it ? does the unit heat ? if so, could be a hi voltage diode, or a hi voltage tranformer. (older frigidaire m'w's had trans. that would crackle and "arc" when bad) it is not the mag though, it wouldn't heat if so.
Hey,
Try this
Probably a high voltage diode popped because contaminated grease eventually built up and made a path for a high voltsge arc to occur.. To confirm,take the outer cover off the microwave and discharge the high voltage capacitor by shorting its terminals.Then pull the plug off the magnetron side and place it near the magnetron socket. Now turn the microwave on and push the connector on the magnetron with a chopstick or a long insulated screwdriver. If no arc when you do this this confirms a bad diode.
Your problem is due to the "magnetron" arcing to the wave guide within the microwave. Picture someone arc-welding stuff together inside the microwave casing, that's essentially what's happening. It is a fire hazard and you should stop using the microwave immediately. As far as I know, there isn't a recall on that particular model (though there was on another similar Kenmore/Whirlpool model) so if it's out of warranty, you're out of luck.
The magnatron is shorting and overloading the high voltage transformer
which is complaining with a load noise. Worth fixing if you do it
your self. Magnatrons cast about $40 wholesale. There are
just a few varieties of them that fit almos all brands. Try
www.partstap.com
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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