Author Topic: Kitchenaid microwave/hood , magnetrons burn out  (Read 3645 times)

Offline AJ

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Re: Kitchenaid microwave/hood , magnetrons burn out
« Reply #10 on: September 29, 2012, 10:01:32 AM »
Here is the tech sheet. It has a schematic.
Hope that helps.

Let us know what you find.
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Offline Bailey

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Re: Kitchenaid microwave/hood , magnetrons burn out
« Reply #11 on: September 29, 2012, 10:26:27 AM »
Inverter technology. All that means is they found a way to make them cheaper!

Offline RegUS_PatOff

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Re: Kitchenaid microwave/hood , magnetrons burn out
« Reply #12 on: September 29, 2012, 10:48:15 AM »
... I can't throw this one away, its an $800 microwave.
yes, you can ..
here's an excerpt from a similar Panasonic Inverter M/W repair info

With the cover off the microwave oven and CRO connected,
the control and status signals were measured with the oven operating.
The Control signal turns out to be a TTL-level 220Hz square wave
where the duty cycle determines the “Power” from the Magnetron.
The Status signal from the PSU is a 110Hz square wave with a fixed 50% duty cycle.
 This signal seems to be present when there is a current drain,
probably to signal that the Magnetron is warm and operating.
The Control and Status signals are synchronised to each other,
but bear no relationship to AC mains frequency or phase.
Here’s a picture of the CRO trace showing the control signal (top)
and the status signal (bottom).
 
2-channel oscilloscope waveforms:
« Last Edit: September 29, 2012, 10:54:19 AM by RegUS_PatOff »
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Offline QFMaint

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Re: Kitchenaid microwave/hood , magnetrons burn out
« Reply #13 on: September 30, 2012, 09:45:16 AM »
AJ ,  Can't open file .  Small window shows " File is damaged and cannot be repaired"   Can you try again ?  Thanks

Offline AJ

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Re: Kitchenaid microwave/hood , magnetrons burn out
« Reply #14 on: September 30, 2012, 09:47:50 AM »
AJ ,  Can't open file .  Small window shows " File is damaged and cannot be repaired"   Can you try again ?  Thanks


That's strange, just tried it again and it still works fine for me.
Anyway here is another copy.
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Offline QFMaint

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Re: Kitchenaid microwave/hood , magnetrons burn out
« Reply #15 on: September 30, 2012, 10:32:13 AM »
Thanks , I got it that time.   Well , it doesn't show the detail I was looking for.  The 2 red wires that connect from the inverter board to the magnetron, I may have switched connections. Does this make a difference?  I see the mag marked F & FA , but the inverter is not marked.  The Schematic does not show the marks.
 I've been away from it for awhile and forgot to mark wires so here's what i did so far;
Replaced the mag, inverter ,capacitor & thermostat sw. above the mag.  I put a cup of water inside and turned it on 1 min. and the water was luke warm. Put back in for 2 min. , luke warm again .  Also heard no hum from mag when it was running. Thought I reversed red wires to mag so I switched them. Turned it on again and mag burned up , along with thermo sw.  I also tried switching the wires to the capacitor before I tried the mag wires, but it didn't make any difference.
 Your thoughts please . . .  thanks

Offline AJ

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Re: Kitchenaid microwave/hood , magnetrons burn out
« Reply #16 on: September 30, 2012, 10:44:32 AM »
Quote
The 2 red wires that connect from the inverter board to the magnetron, I may have switched connections. Does this make a difference?  I see the mag marked F & FA , but the inverter is not marked.

I don't do microwave repair like I use to and have never fixed one of these with a inverter.
On a standard microwave it does make a difference with the F & FA.

Back when I started doing appliance repair 1988 I mostly worked in the shop and the other tech did service calls.
Back then a lot of people would bring things in to get repaired. I remember having days were all I did was microwave repairs.

Things sure have changed in the last few years for microwave repair.




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Offline niobrara

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Re: Kitchenaid microwave/hood , magnetrons burn out
« Reply #17 on: September 30, 2012, 11:22:45 AM »
Sounds like bad wave guide.

Offline Wedgeman55

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Re: Kitchenaid microwave/hood , magnetrons burn out
« Reply #18 on: October 16, 2012, 11:01:21 PM »
Fact is - you get one or two parts burnt out in a microwave, not worth repairing.    You can get a brand new one for almost the same price.     It's not the like the days in the past where you had to spend big bucks on a microwave.     Unless its a switch or something simple,  not worth it in my opinion.   
Commercial Laundry repair Tech and Installer  1973 to 1980
Service Manager / Technician Commercial Laundry repair company 1980 to 2002
Refrigeration - HVAC - Boiler School 1974-1976
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