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magnetron replacement - Need help

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I believe I need to replace the magnetron. Can someone direct me to some directions on how to get at

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Old 06-18-2012, 07:19 PM
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Default magnetron replacement - Need help
Model Number: GMC305PDQ2   Brand: Whirlpool   Age: 5 - 10 years   

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I believe I need to replace the magnetron. Can someone direct me to some directions on how to get at it. I need some directions before I purchase a new one.

The microwave shuts down in 3 sec , but if I put it a 0 power it will run forever. I read here that it may be RF leakage from the magnetron

Thanks for your help
MikeB.


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  #2 (permalink)  
Old 06-19-2012, 06:27 PM
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Default

Hi Mike,

You have to remove the microwave from the oven cabinet first. The instructions are attached to the reply.

- The magnetron Part number: 4375072

Part number: 4375072



Here are the breakdown diagrams and Replacement parts for Whirlpool GMC305PDQ2 ELECTRIC OVEN/MW COMBO | AppliancePartsPros.com

Gene.
Attached Files
File Type: doc Removing the microwave.doc (1.11 MB, 24 views)
File Type: doc Removing the magnetron.doc (906.5 KB, 27 views)
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Old 07-23-2012, 06:28 PM
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Default Still not fixed

OK, so the symptoms are: microware runs and heats for 3 sec and then shuts off as if the door was opened. If the microwave is on 0 power, it will run forever. It is only when the magnetron kicks in that the unit will turn off

I replaced all 3 door switches and the magnetron. I checked the magnetron thermal switch and it is good. I am tired of throwing parts at this thng, but what else could it be. Next I was going for the capacitor. Any help would be appreciated.

Thanks

MikeB.
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Old 07-24-2012, 10:22 AM
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Hi.

Did you check if the magnetron fan is working?

Also, check the cavity and magnetron thermal fuses when the microwave stops working.
If everything check out OK - then most likely it's the relay in the control board.

Thank you.

Simon.
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Old 07-24-2012, 11:07 AM
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Simon - Thanks for the reply. Yes, the blower motor is working. I did verify the magnetron thermal cut-off is working (actually cuts off at about 170F - 180F Vs the 145F per spec). I did not verify the cavity thermal cut-off.

What would cause the relay to cut out? Most relays will fail to pick or fail to release. In this case, it will pick for 3 sec and then release.

Also, it seems that after I have worked on the unit, when I first power it up, all is good. I have run the unit for 10 mins w/o any issues (I put a few cups of water water in the microwave and it heats up just fine) It is the next day that it starts acting up again.

Thanks
MikeB.
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