Question about GE XL1800 1100 Watts Microwave Oven

2 Answers

Burned magnetron antenna

I have an XL1800 manufactured in 2004. About a year after we had it, during a cook cycle it would make a terrible, loud buzzing noise (like it was going to blow up) - like a shorting transformer. I replaced the magnetron and the same thing happens. I tested the diode (read inf in both directions with a fresh 9V battery in my multimeter) so I ordered another. However, this new diode from GE also reads inf in both directions - anyone have a solution for that one? But my main quetsion is that I noticed on both magnetrons that I pulled out, there is charring on the dome - or antenna (I assume that's what it is - the brass-colored portion that goes into the waveguide).

Is something more serious happening here than the magnetron simply shorting out? How could the dome get burned?!

Thanks a lot for any help.

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I just purchased a replacement diode and wanted to test it before I installed it and found my meter didn't have the power either. I did some google searches and found that it is more common that if the diode fails it will be shorted and will have continuity in both directions. If you want to test a hv diode get a dc power supply between 12v and 15v ( I used a auto trickle charger ...but a dc wall adapter will work) . Connect a 1 watt resistor to the positive lead on the diode, then connect the pos side of the power supply to the other end of the resistor. Connect the negitive side of the power supply to the neg end of the diode. connect your meter to the diode pos and neg leads. This will determine proper behavior, at least at low voltages.

The following is the schematic of a simple HV diode tester:

240 ohms, 1 W
+ o-----------/\/\---------+------------o +
|
__|__ HV Good: 6 to 10 V
15 VDC _\_/_ diode Shorted: 0 to 2 V
| Open or reversed: 15 V
|
- o------------------------+------------o -

The voltage drop in the forward direction should be at least 6 V with a few
mA of current but may be somewhat higher (8 V or more) with a few hundred mA.
If your DMM or VOM has a resistance scale operated off a battery of at least
6 V, you may get a reading in one direction (but only one) without the need
for an external power supply.

Posted on Jan 02, 2009

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  • GE Master
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The average multimeter does not output enough voltage to forward bias a high voltage diode, so it will seem to read open. This is normal.

It still may need a new high-voltage diode and stirrer, and the cavity may be affected.

GE had a campaign (but not a recall, mind you!) covering several models.

Details are in their bulletin at http://207.234.249.73/mwd/ge_mw_mag_kit_bulletin.pdf

The parts kit (that GE used to pay for) is part # WB27X10489 and is shown in the photo below.

If you or a friend decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

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

Chances are GE won't cover any of this, but just in case you want to contact them, GE Customer Service is at http://www.geappliances.com/service_and_support/contact/

We're happy to help and we appreciate your thoughtful rating of our answer.

burned magnetron antenna - ed6ad0e.jpg

Posted on Jan 20, 2008

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MicrowaveSvc
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SOURCE: Buzzing noise and burned magnetron antenna

Seems you've posted on this several times, and I've answered them all, but I'll cover this one, too.

GE had a campaign (but not a recall, mind you!) covering several models.

Details are in their bulletin at http://207.234.249.73/mwd/ge_mw_mag_kit_bulletin.pdf

Even if your model is not on the list, the same problem can occur, requiring a kit. I just think the difference is that GE has stopped paying for the repairs.

The parts kit (that GE used to pay for) is part # WB27X10489 and is shown in the photo below.

We're happy to help and we appreciate your thoughtful rating of our answer.

0b775ab.jpg

Posted on Jan 20, 2008

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We're happy to help and we appreciate your thoughtful rating of our answer.

0b775ab.jpg

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