Most microwave ovens contain a heavy transformer that produces a lethally high voltage that is half-wave rectified by a diode, smoothed by a capacitor and drives a magnetron. The transformer also provides a low voltage for the magnetron cathode heater.
There are also lightweight microwaves that use an inverter instead of a transformer...
If everything else is ok and power is being supplied to the transformer then one of the above components has failed but testing them is beyond the scope of the handyman, though with care some ohm meter checks can be carried out in a unit that is disconnected from the supply and if the capacitor isn't fitted with a discharge resistor great care must be taken to ensure it is fully discharged before handling it.
SOURCE: GE Microwave problems after HV capacitor replacement???
The rectifier diode could indeed be bad. But first I would want to know what value (in uF) the old one was and what is the value of the new one? If they're too far off, the difference in the capacitive reactance could throw off the "tuning" of the circuit. The uF value of the capacitor is optimized in relation to the other components used in the system. Of course, you'd also want to be sure your new cap is at or slightly above the working voltage rating of the old one, too.
SOURCE: Makes a loud humming sound and blows fuse behind controll panel
Most likely a shorted capacitor is causing the fuse to blow. Easy and cheap to fix.
Check with www.martinmicrowave.com or call toll free 1-877-894-0035 for parts info
SOURCE: GE Advantium 120 Microwave fan stays on, off only when door open
Looking at the schematic in the service manual here, I would say relay RY6 on the small sub PCB (relay board) has shorted contacts.
That's the relay that runs both the fan and turntable.
It's possible that it may be a bad connection or driving component on that board, but in my experience, it's virtually always a stuck relay.
The part number on the relay as shown in the photo is hard to read, but it looks like "OJ-SH-112LM".
I should have one of these or I can point you to one if you want to contact me with the exact number.
Feel free to contact me directly (and please remind me of your
full model number) for more information & help.
We're
happy to help you with free advice and we'd appreciate your
thoughtful rating of our answer.
William E. Miller
[email protected]
http://www.microwavedisplay.com
SOURCE: control panel "locked" on ge advantium 120
You might have set the child lock. Look in the manual. It is on P.36 in my manual.
SOURCE: GE Advantium oven SCA 2000
The fact that it stopped during cooking, then came back on after several minutes, tells me that the magnetron probably overheated and its thermostat (called the M.G.T. T.C.O. in the service manual here) opened until it cooled back down.
An overheating magnetron
can be due to:
The fact that the oven is now quieter tells me that one of the high voltage components may have failed, or the high voltage section is not getting power.
It may be as simple as a failed top door switch (see this test file) or it may be a failed high voltage component, most likely the high voltage rectifier diode or the magnetron.
Here are some links you
or someone you know can use (in order given) for test help, but read
the safety warnings first:
http://www.gallawa.com/microtech/mag_test.html
(continuity can be good even
though mag is bad!)
http://www.gallawa.com/microtech/diode.html
(if it is NOT shorted or burned looking,
it's probably fine)
http://www.gallawa.com/microtech/xformer.html
You can find
helpful exploded view diagrams and order parts by entering your full
model number from the tag on the oven here.
Note that the magnetron has a five-year warranty. If it's under magnetron warranty, GE will
send you the magnetron to do it yourself.
If the magnetron is bad, call them at 888-239-6832 with the full model number, serial number, and date of manufacture.
We're
happy to help you with free advice and we'd appreciate your
thoughtful rating of our answer.
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