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Microwave trouble  Rate Topic 
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 Posted: Sat Apr 23rd, 2005 02:19 am
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Edtv
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Hello, Oh Wise Ones.

Once again I humbly seek your advice. This time its my microwave oven.

Kenmore

model #565.8844781

My wife went to use it this evening and as she was pressing buttons on the panel the thing went dark. No clock, no light inside and no panel beeps.

I checked the electrical panel and have found no blown breakers.

Otherwise I have gotten no further in troubleshooting than the initial stage of looking at it and saying "Huh!"

Any words of wisdom?

tia,

Ed

 

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 Posted: Sat Apr 23rd, 2005 04:27 am
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Samurai Appliance Repair Man
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Start with the microwave diagnostic page.  Also, this table of microwave component tests will help. 

 



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 Posted: Sat Apr 23rd, 2005 04:52 pm
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Edtv
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Thanks for the advice and for a great web site. The resources here have again helped me achieve victory!

I found the in-line fuse bad when I opened it up. Bought fuses, put one in and I'm back in business.

:banana:

I also bought a new fuse holder just in case but I'll wait and see if it blows again.

Thanks again.

Ed

 

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 Posted: Sat Apr 23rd, 2005 05:01 pm
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Samurai Appliance Repair Man
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Thanks for the follow-up report!  :rocker:



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 Posted: Tue May 18th, 2010 06:23 pm
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Edtv
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Here I am again...same microwave as before.

Its blowing the fuse again.

This time it seems to blow consistently as soon as I start it.

I've replaced the fuse twice this morning and it blows within a second or two.

Once again I seek your wise counsel.

Should I try to fix it or just punt ??

Thanks again.

Ed


Edtv wrote:
Hello, Oh Wise Ones.

Once again I humbly seek your advice. This time its my microwave oven.

Kenmore

model #565.8844781

My wife went to use it this evening and as she was pressing buttons on the panel the thing went dark. No clock, no light inside and no panel beeps.

I checked the electrical panel and have found no blown breakers.

Otherwise I have gotten no further in troubleshooting than the initial stage of looking at it and saying "Huh!"

Any words of wisdom?

tia,

Ed

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 Posted: Tue May 18th, 2010 07:29 pm
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Samurai Appliance Repair Man
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Lots of times, a blown HV rectumflyer will cause the fuse to blow. Check it out along with the capacitor and transformer. Be sure to discharge the capacitor when you get the control panel open.



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 Posted: Wed May 19th, 2010 02:25 am
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Edtv
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Have you a handy link to show me where the 'HV rectumflyer' may be and how to test it?

Thanks.




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 Posted: Wed May 19th, 2010 03:34 am
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click on Microwave diagram:

Sanyo Kenmore 565.8844781 Parts Lists & Diagrams

to test HV Diode, you would need a OHM Meter that uses a 9v Battery,

using the highest OHM scale, (2 Meg) youd should read "something" on "forward" and "infinite" when reversed



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 Posted: Wed May 19th, 2010 05:00 pm
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Edtv
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Wow!! Ask and ye shall receive!

Thanks very much...you guys are awesome.



Well the HV cap reads as shorted. The needle on the meter goes all the way to the right and stays there.

I got no reading at all on the diode attached to to the capacitor.

What do y'all recommend??

Thanks again for all the help.

Ed
 





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 Posted: Wed May 19th, 2010 08:23 pm
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RegUS_PatOff
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A shorted Cap is common ..

The HV Diode is actually *many* Diodes in series and sometimes needs more voltage than an OHM meter uses...

You could try using a 9v Battery in series with the Diode and read with a Voltmeter


Some equivalent replacement Diodes are cheaper than others ..



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 Posted: Wed May 19th, 2010 11:17 pm
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Samurai Appliance Repair Man
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I'd replace both. The rectumflyer isn't usually a lot of money anyway. The OEM rectumflyer for your m/w is NLA. But a generic will probably do-- they're all about the same.

Part link for rectumflyer==> Click

You'll want to match the capacitator as close as you can to the existing capacitance.

Part link for capacitator==> Click



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 Posted: Sat May 22nd, 2010 10:07 pm
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Edtv
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Picked up the hv capacitor locally, put it in there and...


all appears to be well. Its run for a couple of minutes with no problem.

Previously it wold run for about a second before it crapped out.


Thanks again for all the advice.

Ed


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