Ge WB27X10908 Diode Hv Assembly (High-Voltadiode) OEM Part

After testing the power diode and capacitor that drives the magnetron power source, they came up good on the static tests with the multimeter and battery (used for the diode test). And the static test of the magnetron came fine too, ie: passed the ohm resistance test and short to case resistance tests. Still the oven works only heat water to ~137 degrees max even after running for several minutes. I suspected a break in the winding of the magnetron might be opening after it heats up. Try as I might to get it hot, then disconnect the power wire lead (after discharging the power capacitor first) and check it again with the ohmmeter, it always passed. So I swapped the suspect bad magnetron with the new one and ran the water test again, this time the water was boiling on slightly less than 2 minutes. It’s been running fine ever since! My wife couldn’t believe I fixed it. She was ready to buy a replacement monogram microwave but I was able to successfully wave her off. Thank you Appliance Parts Pros!

I tested each switch and component in sequence starting with the door and interlock switches and then went through each high limit switch looking for a short or out of sequence switch. When they all checked out I checked the High Voltage Capacitor and diode assembly which were the next devices likely to cause a blown fuse. Using a Digital VOM set to 20 Meg Ohms, the capacitor read out as shorted. I replaced the capacitor and the diode as a set and it corrected the problem.