Question about GE JVM1630 Microwave Oven

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Loud humming Two seconds after starting a cooking cycle the microwave begins to hum louder than usual, it seems to be getting louder. I have check the mounting to make sure it is tight. What other options do I have?

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  • Anonymous Oct 06, 2008

    I have the same loud humm problem and the unit does not heat anymore. I believe it is the magnetron.



    I want to replace the magnetron myself, is it an easy repair? Does anyone have instructions (or an online link to them) for taking the unit apart so that I can do it myself?

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Ouch. Magnetron check performed with multi meter.


1) Disconnect power to unit
2)Allow to stand for minimum 5minutes
3)Remove cover
4)Find large insulted screwdriver
5)short terminals of capacitor to dissapate charge. (If no pop or crackle its possbly already bled through resistor.

Right. Magnetron check both terminals for short to casing if shorted, replace. Check reading between terminals low resistance or direct short is not a problem. Open circuit, replace.

For non heating, this is usually barrel fuse, typically HV 5Kv or more, faults in an overcurrent situation.

Check the capacitor for shorts to casing, a short will indicate a failure. Check the diode in the capactior if fitted by reverese continuity check accross the terminals. MUST DISCHARGE FIRST, else you'll blow the meter up and likely recieve a SEVERE burn.

The most common cause would have to be a problem with the capacitor next the transformer for loud humming. Three basic checks for the transformer.

Probe the low voltage side first, open circuit? replace. a low reading is normal, high voltage side is a two part process, take a reading between the two terminals one goes to the magnetron the second to the capacitor directly. this should be approx the same reading as the LV coil. The last and most important coil is to check the coil side ofthe barrel fuse to ground, this will measure between 80 - 150 on a digital meter, around 90 to 100 for a 900w is in the normal range.

Loud humming is created primarily by having a working transformer with no wher to send the voltage out.

It will only be one or more of these three items, which will cause this, the rest is safety and control gear.


Posted on Dec 10, 2008

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I would suspect the high-voltage transformer in this case, but the capacitor may be failing.

The high voltage section uses and generates voltages that can be instantly lethal.

So I don't recommend that anyone work in this area unless he has either a lot of experience or at the minimum, a good understanding of the safety issues and procedures involved.

If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

Also, there should also be a very helpful "mini-manual" hidden inside the unit behind the control panel. It's very helpful when troubleshooting.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

Here are some links you or a friend can use for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/cap_test.html
http://www.gallawa.com/microtech/diode.html
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html

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