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John, Home Appliance Technician
Category: Appliance
Satisfied Customers: 13453
Experience:  Appliance repair business owner for over 43 years.
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I have a microwave Jenn Air (JMC8100ADB) that is blowing

Customer Question

I have a microwave Jenn Air (JMC8100ADB) that is blowing fuses. The repairman I took it to told me the transformer was bad and it was obsolete, so he tried to sell me a new one. Its a oven/Microwave combo so didn't really want to do that, so I orderd a recertified transformer online and tried it and the fuses still blow.
Submitted: 1 year ago.
Category: Appliance
Expert:  Whrlp Master Tech replied 1 year ago.

Hello from JA
My name is Woody.
I will be glad to assist you today.
I have been servicing ALL Major Brands of Appliances for 35 Years,
and have over 100,000 in home repairs and over 80,000 internet repairs under my belt.

Do you have a Volt-Ohm meter and know how to use it? to be able to do any testing .

Customer: replied 1 year ago.
No, I can get one. I'm not at home right now. I did try a few things and can get the microwave to run throught a time cycle with 20amp fuse installed, but it won't heat.
Customer: replied 1 year ago.
Can I send you a picture description of what I tried? I think what I did wouldn't let the magnetron run, but want your opinion. everything functioned I think except the magnetron. The timer, turntable, fan, all worked, it timed out as normal and then stopped with the ring at the end like normal.
Customer: replied 1 year ago.
The unit is a oven combo so I would like to get a couple more years out of it before we do kitchen remodel
Customer: replied 1 year ago.
The thermal sensor wire, plugs into the control module, I unplugged that and it worked as normal without blowing a fuse, did as I described, but wouldn't heat, since suspect the magnetron wasn't functioning.
Expert:  Whrlp Master Tech replied 1 year ago.

ok so then you will need to get a meter and test the magnetron to see if it or the capacitor and diode are shorted to ground those three things are the magnetron circuit

Expert:  Whrlp Master Tech replied 1 year ago.

and yes a picture and description of what you have done would be great!

Customer: replied 1 year ago.
I can't past into this window. Can I email it?
Expert:  Whrlp Master Tech replied 1 year ago.

just use the attachment icon and send it in the post.

Customer: replied 1 year ago.
Please view the PDF attached
Expert:  Whrlp Master Tech replied 1 year ago.

ok your thermal sensor is the magnetron thermostat if it was bad or the wires removed the transformer will not get power to produce the high voltage needed for the magnetron to fire.

So we are still on the high voltage side.

And you will need a meter to ohm out the magnetron to see if it has continuity or not and then the diode and the capacitor also.

Customer: replied 1 year ago.
Ok. Then that looks like next steps for me. I will get a ohm meter to check out the items you have outlined. This won't happen until later, so not sure how we keep this issue open until I can contact you with results and further assistance.
Expert:  Whrlp Master Tech replied 1 year ago.

Just copy This conversations URL and paste it into your favorites and get back to me when you can!

Customer: replied 1 year ago.
Can we pick this conversation up if I log back into my acct? The URL won't save?? has the symbols in it that aren't acceptable to save to in favorites??
Expert:  Whrlp Master Tech replied 1 year ago.

copy and past it somewhere the just past it into your URL address !

Customer: replied 1 year ago.
Ok thank you.
Expert:  Whrlp Master Tech replied 1 year ago.

no problem!