How to test a microwave oven diode high voltage CL01-12 / como probar un diodo de microondas HV 

YES! Excellent video! Short and to the point.

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Thanks George! ...there is a new video about it. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-F1mTElvwcBg.html

Thanks! :-)

Diode has a very high resistance about 20m ohm, shouldn't explode. Weird.

Charles Freeman yes it is good

+davecc0000 That video will be soon in the other chapters of how to test an ATX switching power supplies. (There are 3 more videos on the way. PWM, transistors, diodes, and maybe I will add a 4th one too about some of the resistors in it). Thanks by asking! :-)

The emission of an old magnetron might increase with a bit more filament voltage but it does not take much overvoltage to hugely reduce the life.

It is showing the diode is functioning correctly, a diode will only allow current to flow in one direction!

Yes. A diode is a diode. Nothing more or less. High resistance in one direction & low in the opposite = Good Diode. Low resistance in both directions = Bad diode. (short circuit) High resistance in both directions = Bad Diode. (Open circuit) ( It's basically a halfwave rectifier.)

Mine’s the same, so was it broken?

@@bl1tzk1213g A diode only allows current to go one way!

Non-high voltage diodes

Hi! Yes it is bad. Diodes conducts in one way, and a "no way diode" is a bad diode.

Thanks Bob, I was searching for such simple testing technique from long time. Thanks for sharing such valuable informative video....keep posting

Everywhere. eBay, Amazon, Google shopping, appliance repair stores on line, local service shop but beware: price variation is staggering.

even i got the same what is that suppose to mean?

NSIKAK UDOH it not a good one

no, that's a shorted diode. = bad.

Nope. It's become, literally, a piece of wire!

When I test my diode am getting the same amount of voltage in the both ways...it's bad ?

@@anthonydos7506 It is bad.

@MESSEXVIBRANT and was it bad or not?

Hi! The problem with Mega-Ohms is we are not sure what are we reading about. It is better to give enough polarization voltaje and make sure if the diode conduces or no.

@@bob.kalpon1398 Your test is exactly correct based on my microwaves repair instruction and for the reason you state. You're right on the money as far as the diode testing procedure is concerned my friend. My included microwave repair testing/specs has in addition to the 9v battery test, testing the resistance of the diode itself. No other repair video or instructions I've found anywhere details a resistance test of the diode itself EXCEPT mine from what I can tell and a lot of folks don't have meters that go that high, it's extremely sensitive for a cheap Chinese model, but works well. :) LOL So, I thought I'd see if you has seen that. My Kenmore Elite model 721.66462500 expanded servicing instructions I just happened to find online. Page 23 detail my diode testing procedure: www.appliancefactoryparts.com/content/pdfs/142308-2.pdf It's ashamed YT doesn't allow small file or picture attachments, pretty stupid actually, it would be very helpful in dialogs such as this. I think YT (Google) is missing the boat on this one. If they were smart they would add that capability to keep people from logging off Google product to search forums that allow file attachments in conversations. I guess Google's maturing and turning into another "old boy" company.

@@ThePreyMantas The 40MOhm test is just to ensure we got infinite resistance. It means if 20 Mega Ohms was the maximum scale, then 20 Meg is the infinite... The reason why I said we can get confused is because we can get readings from hands, table, even inductance around. The main idea should be to find out if there was current linkage, but that test must be more specific. (I am glad I passed your test! ...I made a newest video about the microwave diode tes and it is between my las videos uploads).

@@bob.kalpon1398 Hi Bob, That's what I figured and I noticed it was so sensitive that even getting hands in close proximity of the probe tips cause minute variations. When I first got the meter (mainly for capacitance and uF measurement) I was concerned because it was unbelievable inexpensive I thought maybe it wasn't going to be keeper tool, but I was wrong and it turns out it has much lower measuring ability than my Fluke! As you could see in my service manual, there are somethings that are vague and some things that can be confusing for the uninitiated like myself. I'm a nuts and bolts guy (Journeyman Machinist/Programmer by trade) so I'm great with computers, programming and making trick high quality, very tight tolerance, complex machined parts. Electronics... Ahhhh, not so much. I'm just starting to get into it (out of necessity as you can see), so I suspect I'll pick it up if I stick to looking at schematics and using the hell out of Google. I inherited a vintage 57' Gibson Les Paul Jr tube amp I would to refurb. Have you ever seen Uncle Doug's channel? Check him out, he's a master. Til next time!

Just a follow up. I confirmed that indeed new, unused Mag terminals to housing should be OPEN, so I'm glad for your help and everyone else who's posted vids on troubleshooting microwaves. Some folks touch on that, but most don't which strikes me as unusual, since everyone tests out the Trans for shorts to casing on primary winding. Unfortunately I know them by heart now, but I can't let anyone know that. I have enough on my plate... :) Thanks again!

They are the same. RG is the manufacturer code. 203.609.706.903 must refer to the lot and date of manufacture.

​@@evandrocarvalho4692 is RG804 same as RG203, RG609, RG706 and RG903?

+davecc0000 That is a good question. When we try to test devices, this diode, another devices, like leds, "mosfets transistors"... We don't want to explore the highest voltages. We want to go for the lowest or minimum voltage we can use to perform the test. Remember some devices are low current, or low reverse voltage case sensibility. I will say this kind of test, is an "abusive" way to make a practical test with low resources. (But effective!) ;-)

+Bob. Kalpon -- Oven diode runs on high voltage, yes? Components (diodes, caps, etc.) can test good at low voltage but some may leak at high voltage. That is why it is good to test at high voltage that is used in the circuit.

+davecc0000 Hi Dave! We use Special Components Analyzers for it. Most of that equipment are missing in Universities Labs and our workshops. I am working in home made PROFESSIONAL electronics equipment, and I will make videos for you guys, about how to make your own equipment with the same standards than the branded ones. Believe me! If you know to bake cakes, no good bread is better in the bakery than from your oven. I got your answer. But we will see it ahead, with our professional equipment in our workbench. (Dave, all the big youtube guys, make videos about "unboxing" expensive equipment that 98% of the viewers can't buy even used. I am a designing engineer. I will show you guys, professional equipment is not hard to make. I told you in the Channel I will make an electronics Lab from zero to up. I don't want fame. I just want to show to the world, that all old those discontinued engineers from the 40's to the 60's, are good for the talent's marked).

so no, we cannot use your method, as most of us do not have an AC power supply, an oscilloscope and so on

A wall socket is an AC source 😏 A light bulb is an indicator.. The bulb should be dimmer than normal. PS. Playing with mains electricity is unwise 😉

I know you posted a long time ago but these are not suitable for high current applications.

I guess it depends on internal resistance on your volt meter.

Hi! In the 0:28 I said the original diode was in short circuit. In the video I showed a good diode's test. It means anything different will be a bad diode.

Bob. Kalpon Thank You!

@@bob.kalpon1398 Hey Bob I just did the same test and I got 4.54 V.Does that mean the diode good or bad?

@@Grenplen hi, I am getting 3,64V is that ok or the diode is bad? Thx @bob. kalpon

short-circuited

That won't work correctly on these, there are a number of junctions in series within the package, the average Fluke cannot forward bias them

Sounds like it is in defrost mode

You are missing the point, microwave oven diodes are actually a number of junctions in series, the average multimeter cannot provide enough voltage to forward bias them.