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 Post subject: Magic chef MCD 1611B microwave diode
PostPosted: May Sun 15, 2022 11:40 pm 
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Joined: Jan Mon 28, 2008 3:19 pm
Posts: 1407
Location: Wilton,IA
Wondering if anyone has replaced the diode with
a generic high [1 KV] voltage unit?
This unit functions except no heat. The diode shows
open both ways, so I suspect it is shot.
Thanks for any input.
Jim


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 Post subject: Re: Magic chef MCD 1611B microwave diode
PostPosted: May Sun 15, 2022 11:54 pm 
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Location: Delavan IL
the couple I have worked on were 12kv. I would double check the specs your looking at. you can buy a pait from amazon for 8 bucks

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 Post subject: Re: Magic chef MCD 1611B microwave diode
PostPosted: May Mon 16, 2022 12:01 am 
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Joined: Jan Mon 28, 2008 3:19 pm
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Location: Wilton,IA
Didn't realize they were rated that high.
Thanks for the heads-up.
Jim


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 Post subject: Re: Magic chef MCD 1611B microwave diode
PostPosted: May Mon 16, 2022 12:08 am 
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Location: Carol Stream, Illinois 60188
If I remember correctly, these are actually layer built diodes and cannot be forward biased using the typical DMM diode test.
You'll need to put it in series with a higher voltage source, like a 9V battery, to check for forward current.

- Jim

EDIT: Also look for open door switches (there are sometimes 2) and open thermal cutouts. Be absolutely certain all testing is done with the unit unplugged -- these things can kill you!!


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 Post subject: Re: Magic chef MCD 1611B microwave diode
PostPosted: May Mon 16, 2022 12:55 am 
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Joined: May Tue 30, 2006 4:46 pm
Posts: 11366
Location: Santa Rosa, CA
Microwave oven rectifiers are usually about 10 KV. You could put 10 or 12 1N4007s in series, but it's better to simply buy a proper replacement with the correct insulation and terminals.

Image

By "layer-built" I think you meant 10 or chips in a series stack. The actual applied voltage is usually only 2 or 3 KV, but the manufacturers use plenty of safety factor to make the application very reliable. Diodes are cheap enough these days.

Rich

If you destroyed a 1 KV diode, I would be surprised if you didn't cause some other damage... or at least blow the fuse (s).


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 Post subject: Re: Magic chef MCD 1611B microwave diode
PostPosted: May Mon 16, 2022 1:03 am 
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Joined: Jan Mon 28, 2008 3:19 pm
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Location: Wilton,IA
Thanks much for the inputs.
All checks out except for the 6 terminal door sw.
Need a schematic to find what's what there.
Have to check the diode with the battery as mentioned.
Jim


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 Post subject: Re: Magic chef MCD 1611B microwave diode
PostPosted: May Mon 16, 2022 3:07 am 
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Location: Detroit, MI USA
Whatever else you do, it's not a good idea to try to measure the HV on a microwave oven with the power applied. If you get 120VAC at the primary of the HV transformer that proves everything up to that point, door switches, relays, etc. is working. If you must measure HV, you need a meter and test leads capable of handling the voltages, which you would connect with the power off and then apply power without touching anything while it's energized.

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 Post subject: Re: Magic chef MCD 1611B microwave diode
PostPosted: May Mon 16, 2022 4:32 am 
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Joined: Oct Thu 27, 2011 8:39 pm
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Location: Houston, texas
You do not have to touch that high voltage to zap you... It can reach out and touch you.


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 Post subject: Re: Magic chef MCD 1611B microwave diode
PostPosted: May Mon 16, 2022 1:27 pm 
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Joined: Jan Mon 28, 2008 3:19 pm
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Location: Wilton,IA
Thanks again, guys.
If checking HV, I'd get out the CRT HV
tester.
Jim


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 Post subject: Re: Magic chef MCD 1611B microwave diode
PostPosted: May Mon 16, 2022 1:32 pm 
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Location: Detroit, MI USA
Brownie45 wrote:
Thanks again, guys.
If checking HV, I'd get out the CRT HV
tester.
Jim



Unfortunately, you can't, as the polarity of the HV in a microwave oven is negative since the anode of the magnetron is grounded and the HV is applied to the filament.

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Experience is what you gain when the results aren't what you were expecting.


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 Post subject: Re: Magic chef MCD 1611B microwave diode
PostPosted: May Mon 16, 2022 1:40 pm 
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Joined: Jan Mon 28, 2008 3:19 pm
Posts: 1407
Location: Wilton,IA
Thanks for that info, Dennis.
Jim


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 Post subject: Re: Magic chef MCD 1611B microwave diode
PostPosted: May Mon 16, 2022 2:20 pm 
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Joined: Mar Tue 03, 2009 11:12 pm
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Location: Great Bend KS
The last microwave I worked on had a magnatron that shorted the filament to ground. No other symptoms other than no heat, no fuse blown, no blown capacitor. Easy check for that with an ohmmeter.


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 Post subject: Re: Magic chef MCD 1611B microwave diode
PostPosted: May Tue 17, 2022 2:07 am 
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Joined: Jan Mon 28, 2008 3:19 pm
Posts: 1407
Location: Wilton,IA
Thanks, Steve for that, as I didn't think to check
that out.
Prices on parts are quite high depending on where
you look. Cap is on the order of $100 at one place,
& other parts are pretty steep.

A new similar unit is on the order of $160, but the
question of how well made they are now looms
fairly large.
Jim


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 Post subject: Re: Magic chef MCD 1611B microwave diode
PostPosted: May Tue 17, 2022 2:42 am 
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Location: Ann Arbor, MI
sawblade54 wrote:
the couple I have worked on were 12kv. I would double check the specs your looking at. you can buy a pait from amazon for 8 bucks

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 Post subject: Re: Magic chef MCD 1611B microwave diode
PostPosted: May Tue 17, 2022 4:08 am 
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Joined: Aug Tue 04, 2009 2:15 pm
Posts: 707
Location: Elmira, NY
Sometimes the spark gap arrestors built into the magnetron or socket go bad causing a short.
Of course, check the 20A fuse first.
As other’s said, the diode is actually multiple junctions (multiple diodes) to increase the PIV,/PRV rating. It can take several volts to bias the rectifier into conduction.
I usually changed both the rectifier and capacitor together.
Good luck


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 Post subject: Re: Magic chef MCD 1611B microwave diode
PostPosted: May Tue 17, 2022 8:07 pm 
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Location: alameda,CA
Anything made in the last 20 years if probably going to be about the same, meaning if you get 10 years out of them then that is about it. You could check your local habitat for humanity "Re-Store" as they tend to have tons of used appliances. I have a early 80's Amana Radarrange and its built like a tank.


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 Post subject: Re: Magic chef MCD 1611B microwave diode
PostPosted: May Tue 17, 2022 8:14 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 29171
Location: Detroit, MI USA
Agree the older stuff is much better than any which were made recently, if you can get the right parts to keep them going that's the way to go. We still use a 1984 Kenmore made by Sanyo.

Saw an older Amana commercial unit at a yard sale recently but it was for 220 volts only, so it wouldn't work in very many home kitchens. I'm sure it would have taken two people to lift it.

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Experience is what you gain when the results aren't what you were expecting.


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