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Galaxy 721.80002401 microwave has no power

This is 2 years old. We dont hear a power surge sound and although the power is on high it seem like its running at 20% power. Everything else works except the power is very low. Can I replace the PCB or another part or just trash it.

Thanks Mike

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  • Microwave Ovens Master
  • 9,011 Answers

Galaxy, eh? I wonder if that is the same as the Kenmore model 721.80002401...

Low cooking power usually means you have a bad magnetron.

It should have a warranty of 5-9 years on the magnetron itself. That means that you'll have to pay for labor, but the manufacturer will cover the cost of the magnetron.

Labor might be $75 for a home visit and $75-90 to do the work.

You can save a lot by taking to the manufacturer-authorized service shop yourself. They may charge a $25 diagnosis fee to check it out, and apply that to the labor if you proceed with the repairs.

The first step is to grab your manual and contact the manufacturer.

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

Posted on Jun 11, 2008

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Microwave turns itself off after a couple of seconds


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Microwave won't work. The time is frozen, buttons dont work.


I have over 20 years experience with microwaves and over 25 with all other electronics, and I'll have to say it sounds to me also like some kind of power surge "scrambling" its "brains".

Or possibly its power is being interrupted for a fraction of a second and having the same effect.

A microwave should really be on its own circuit breaker.

Microwave ovens, refrigerators, toasters, and electric ovens are very high current devices.

There are power line (mains) surges created when they cycle on and off.

If the microwave can't be on its own breaker, then maybe you can try a power strip with a surge suppressor, or better yet, a power strip with a surge suppressor and a built-in noise filter.

Or it may be that there is a subtle bad connection on the circuit board or at the fuse holder.

These kinds of problems are difficult to diagnose, and even harder to do remotely. Especially since I'm in the US! *grin*

I would strongly suggest that if you can't cure this with a surge strip or similar, please carefully document when and how it fails, then while it is in a failed state, open the door (to keep it from starting on its own) and call Sharp customer service at 1300 13 50 22.

Or you could visit here and click on Service Centre Location search.

You should have a one year warranty, so you should get in touch with a Sharp-authorized repair center.

An over the range type will include home visits in the warranty, but not if it's a counter top model.

You'd have to take that type to the shop yourself, and of course that would mean unplugging it, which would reset it, and the repairman may never see if fail.

If you wait too long, your warranty will be expired, so I'd get in touch with the shop.

Good luck.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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Power surge


The high-voltage transformer being overloaded by something shorting it out. Either the magnatron or the high-voltage capacitor and diode. Replace the capacitor and diode then if still not working, replace the magnatron. The magnatron is only affordable to do it yourself - buy the part on EBAY - lookup "universal magnatron"
Hope ya fix it!

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Magnatron is suspect. Need to put a voltmeter and see if the input (primary) side to the high-voltage transformer (big heavy iron thing in there) is getting 120Vac. Don't touch the other (high voltage) side of this transformer. If the power is there, you are looking at replacing the magnatron. Its affordable if you do it yourself - buy the part on EBAY - lookup "universal magnatron"

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Check this website:

http://www.partselect.com/microwave+no-heat+repair.htm

It sounds like it is either the power diode, the high voltage capacitor or the magnetron. If it is the magnetron, it may not be worth fixing as these can cost well over $100.

Do you hear a buzzing sound?

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