Kenmore 401 80093700 would not heat tray fan lights display etc all worked normally
Brian S. • Chicago, IL • January 24, 2015
Appliance: Model 401.80093700
My Repair & Advice
I took the microwave apart and visually inspected it, which yielded nothing. I discharged the capacitor with insulated screwdrivers and needle nose pliers. I then unplugged the wires to all the larger components. My microwave had a schematic diagram inside the case so I was able to test with my multimeter all the individual parts against the expected results. I tested the transformer, magnetron, capacitor, and the diode. All parts passed which left me a little discouraged. I removed the magnetron for a closer visual inspection. On inspection I found a hairline crack in the top magnet. My theory was that under electrical load, that crack expanded, which would explain the failure to create heat (and the favorable multimeter tests when cool). I decided to replace the magnetron. I did the diode too since it is only a couple bucks and I already had the case open. I was unable to find the original OM75P10ESGN magnetron so I purchased the substitution, OM75P10ESHL. I put the new magnetron and diode in, cleaned and reassembled all the case pieces, and tested with a glass of water. Water was hot… success!
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