Comments on: A shorted microwave oven repaired. Model: Universal Uni-2040

By: Rick Smith

Rick Smith — Wed, 10 Jan 2018 05:54:40 +0000

Nice and informative article. Thanks for sharing the information with us. Although I am not sure if the process can be performed by non-professionals. But it was worth reading.

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By: Amir Mukhtar Ashrafi

Amir Mukhtar Ashrafi — Wed, 23 Aug 2017 04:37:11 +0000

In reply to Waleed Rishmawi.

thanks you Sir Waleed
Keep Sharing yours Expertise with us .

A Student of Electronics
Amir Mukhtar AShrafi

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By: Waleed Rishmawi

Waleed Rishmawi — Mon, 21 Aug 2017 08:51:25 +0000

In reply to Albert.

Albert: most heads are almost the same. the only thing is the size. they come in different sizes but the operation is almost the same.
about testing the microwave one with metal part on is a very good advice. even with metal off though, it will not harm you in any way unless the body of the microwave oven is old and torn then I would not do it that way. in this case it was in good shape and based on this I did what I did. thanks for your comments.

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By: Waleed Rishmawi

Waleed Rishmawi — Mon, 21 Aug 2017 08:48:27 +0000

In reply to Anthony Paterson.

Anthony: thanks for your comments about this article. yes, you are right I should have mentioned something regarding safety first but I have written about this safety procedures very often and i am sure many people who read my articles before know I have spoken about it before. thanks.

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By: Waleed Rishmawi

Waleed Rishmawi — Mon, 21 Aug 2017 08:43:49 +0000

In reply to Bibhas.

during testing it was fine but when it has a load on it, it causes the earth leakage to trip. very normal in microwave oven repairs.

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By: Bibhas

Bibhas — Sun, 20 Aug 2017 21:59:56 +0000

hallo waleed sir, why you change the magnetron? as you tell your artical that "I unplugged the two pins coil connecter on the top of the magnetron and tested for shorts on the head; there was none".So plz discuss what is the reason for change a new one magnetron. there was nothing to short. ------------ fake artical

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By: Albert

Albert — Sat, 19 Aug 2017 07:55:31 +0000

Finding the exact same microwave head is always a problem but luckily you had one at hand that matched with the HV capacitor circuit. I myself never try turning on any microwave oven without putting the metal cover back first. It after all could be a bit unsafe in case the oven leaks radiation which is invisible to the human eye. (an old colleague had looked into a IR laser head of a DVD or CD player thinking it was not working and now has to live with some eye damage eversince). And the lightbulb test always easily can be done on the outside AC mains plug too anyway. Thanks for the good article Waleed.

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By: Parasuraman S

Parasuraman S — Fri, 18 Aug 2017 15:00:59 +0000

Very good and informative article! Thanks!

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By: Justice

Justice — Fri, 18 Aug 2017 12:38:54 +0000

Thanks Waleed, I gained a lot of technical information on this article.

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By: Anthony Paterson

Anthony Paterson — Fri, 18 Aug 2017 08:44:26 +0000

Any microwave repair should always begin by highlight the fatal voltage that can exist in an unplugged microwave and the imperitive to safely discharge that voltage before doing anything.

See: http://www.microtechfactoryservice.com/safety.html#dischg

Furthermore your partial tests of the Magnetron didn't find anything wrong?

1. On 'high ohms' check between each terminal and chassis and it should be infinity.

2. On 'low ohms' check continiuty between terminals and expect a reading.

Overall, a poor article with glaring ommisions regarding safety.

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