Microwave oven - how does it work & how to fix it
ฝัง
- เผยแพร่เมื่อ 19 พ.ย. 2019
- Today, let's take a look inside a microwave oven. Let's see how does it work and how to repair it. I show all the components of a microwave oven, explain its schematic and talk about its most common failures.
Magnetron autopsy:
• What's inside a microw...
You can support me on Patreon:
/ diodegonewild
My Instagram:
/ savage_danyk - วิทยาศาสตร์และเทคโนโลยี
“I really like those machines. They are super dodgy, especially when opened”.
Haha, I wonder what comes next. 😂
He probably has the most unique accent in all TH-cam.
Arruu Makinngggaa Funn of maii diod mannn?
It is not unique, it is normal Czech accent with 80% of czech people speaking in English. Maybe his from around Prague there is this funny accent also in native language :D
@@gizmosk2996 I'd say Moravian accents are commonly quite funnier 😄
In his early videos, he was trying to hide or correct his accent, but probably he found that he'll get more views and likes with the accent!
It's a Czech accent but beside of that, you can learn from him a lot of things.. Respect to him
You earned a like for having thoroughly explained the levels of extreme danger which can occur while messing with the internals; very professional of you. I love your videos!
"its not far from electric chair" pokes that transformer casually with screwdriver :D
hahaha
The warnings at the start of the video’s are getting longer with each episode 😁
the more dodgy the appliance the bigger the warnings are
bob
And Micowaves are sure worth a few extra lines.
Conservator they are tailored for each video so sometimes they are longer and sometimes shorter.
Best, most detailed, repair guide on the internet.
🎵We gotta install microwave ovens, custom kitchen deliverieeeees〰🎵
I had a similar microwave oven -- only the front was chrome and the knobs were different. It cost $50 and ran for nearly 14 years. I din't bother pulling it apart to see why it died, but I did buy 2 more of them because I prefer the simplicity and reliability of analog controls. 👍
The really amazing thing is that MWO's are usually so reliable despite being nearly full of various switches and fuses that are supposed to stop them working.
I think a lot are just scrapped because they survive so long that they look old and unfashionable.
Looking forward to the Tesla coil build and Magnetron tear down!
EXCELLENT! this bloke really knows his stuff!
Best microwave oven tutorial I have run across. THANX. Great job as always.
Thanks man. Couldn't get the turntable motor in my panasonic microwave oven to work. Even though it was working when direct power was given. Turns out there were some inside wires disconnected during a previous repair. Figured it out thanks to your schematic. Much love ❤️
I have seen a magnetron fail by an ultra fine crack in one of the ring magnets. All tests indicated it should work but no heat was produced. Swapped it with another an all was well. That's when I was able to give the failed unit the added scrutiny to locate the crack. The failure was following a long run cycle causing heat stresses. Great video
Good day, my friend! Thank you for the content!
if you touch the turntable motor terminals and rotate it manually, it gives you a strong shock!
Yea. I discovered that on accident a while ago.
And it's very painful !!
@RedKing Games wtf you were 8y old that open a microwave 😂
I would also do it if I got my hands on a broken microwave
That's true, but the gearing is such that you'd not turn it with your fingers. You'd want to hold it in one hand, shorting the terminals with your flesh and get a vice-grips on the spindle and give it a turn.... that's Darwin award stuff..
I measured it and it went up to 550 volts sometimes..
I'm repairing a lot of things, but damn, I learned a lot from this video!
The HV capacitor acts more like a DC restorer circuit. Still doubles the voltage.
The filament coils are used to let the filament "float" at high frequency AC (high impedance) and low impedance at mains frequency. This is good for keeping the HF out of the power line, but prevent the HF from being attenuated by finding a "ground", even if that ground is floating at mains voltage.
signs: Danger! Danger! Danger!
diodegonewild: *just hits every danger sign with a melal aka conductive screwdriver multiple times because what could go wrong*
On jest wykwalifikowaną osobą, więc napis danger jego nie dotyczy bo prąd ma respekt przed takimi i się ich nie tyka. xD
Swoją drogą facet mnie rozwalił. Powiedział że nie wolno włączać rozkręconej mikrofali bo można oślepnąć itd., a na filmie wyjebka i włączył rozkręconą. xD
Diode can go wild
@@PiotrK2022 Panie to są internetowe wody między narodowe, nasz rodak pisał po angielsku więc proszę odpisywać po angielsku XD
@@crusaderanimation6967
Who cares. LOL
BRAVO. Thank you very much for the detailed explanation. Once, I've open the timer and cleaned the two contact. After it was very difficult to assemble the timer :) . At the the end, I've successed :)
Congratulations DiodeGoneWild you have managed to bump off everyone else on TH-cam to become the favourite TH-camr in London (SW7 4TZ)
Did he microwave everyone else on TH-cam 😳
@@Mark1024MAK Excellent thought Mark, you could be on the right track.
Always a pleasure to see a new video from you
me : mom the engineering teacher told us to open a microwave and draw a schematic of it.
mom *shows me this video at 4:52 *
me :
*danger*
Electroboom: i see this as a absolute win
Excellent guide to cheap microwaves!
Thank you 🙏
We had the same problem in my office, our microwave would not start. My boss gave me permission to open it and have a look. Obviously, the fuse was blown so I replaced it and I scored bonus points on my boss' appreciation! Blown fuse is such a common problem with these things!
Very good information. Too many videos on TH-cam talk about harvesting a transformer from a microwave without mentioning the danger of the capacitor or how to safely deal with it.
Outstanding. I hope your passing your knowledge and insight on to others besides us, your TH-cam viewers! Great video!
Very good style of speaking English and transferring useful knowledge.
Wonderful episode, Thanks.
very well explained sir .. and basic troubleshoot.
I test the diodes with a Megger meter at my work, if I’m not sure it always works :)
Also it works for the capacitors, sometimes they don’t show short circuit with a multimeter but they will with a Megger. Only thing is to be careful after that because this way of testing charges the capacitor ;)
Wow! Just Wow! Thank you very much, my friend! Very useful video. Thank you!
Thank you. Very complete and clear explanation.
So it unfortunly cant be opened, just kidding xD that joke killed me xD
Good explains. I really appreciate your effort.
Mind blowing... This guys a genius. I take my hat off...
Very funny sense of humour....... love it.
Those mica waveguide covers are cheap, you can remove burned ones, clean the waveguide, replace them and the oven is good as new. Nice video! 👍👍
Thanks for the explanation!
Helpful and useful video 👍
Great video and explanation!!! Thanks!!!💓
I actually took apart a microwave recently, and it was using switchmode power supply technology. It was basically the same as a regular switchmode power supply, but the transformer had only 2 windings, the primary and the high voltage secondary. It also had some 3000v capacitors on the board.
I have this same oven except for the front plastic, and I changed the turntable motor a couple years back by just cutting the little metal bits on the bottom as that seemed way easier than disassembling the whole thing.
Fantastic work :D
Very educational and interesting.
Thanks for the video, very high quality knowledge =)
Thanks for your explanation 👍 👍 👍 👍 👍 👍 👍 you are the best 🌹🌹🌹 keep going 👌👌👌
Excellet tutorial and you have a unique voice and an awesome in depth knowledge thank you brother god bless 👍👍👍🙏❤️
You really know a lot - thanks for sharing! Its always a joy listening! :-)
yes
Nice one .. time to watch something real interesting
Test HV Diodes with 12 or 24 VDC and a light bulb. Great video!
My microwave broke down this morning so I decided to try to fix it. It was working but not heating food. SO I thought it might be the HV capacitor or diode. I went shopping for some spare parts at La Strada (the road) and found one about 400m down the street. It turns out to be almost exactly the same as mine and not very dirty and working fine. Easy. And I don't have to relearn the button menus. Even better.
Good explanation thanks.
This guy is brilliant
PWM on a microwave is a first for me thanks for sharing.
I had to test the diode with a 9v battery and small bulb, i suspected 3 diodes in series or similar was inside.
Sometimes the secondary fuse just pops for no real reason, i think they must fatigue over the lifetime of the microwave.
My 800watt microwave is almost identical, the ping timer does the job :-D
The interconnects are designed to turn fan and light on when it fails, so fan and light on always or when door opened, no magnatron of course. This causes people to unplug and stop using as intended.
Panasonic makes an licenses Inverter microwaves... (there are other brands that do them based on Panasonic patents too) I love them personally. They have been on the market for more than 20 years too, and I recently picked up one that was probably 15 years old.. Made in the UK and works great! They do cost usually over 200€ new.
Wow that is the most amazing accent I have ever heard - The Count vampire from muppet show has nothing on this accent.
He alters the speed of words and I have never heard any of my Slovak friends talk like this very unique - when he says "bloody hell" roflmao!!
Great video though very in depth and comprehensive!
Cannot beat a guy who loves his pizza Hawaii!!!
just replaced the capacitor and now my microwave performing is brand new.. before it used to take 2mins to warm up a cup of water now she does it under 30sec! (it is already 15yo but i took good care of it and it was one of those really high end ones from the times of microwave and fridge craze)
Thanks for the info
I am your big fan and love from India
People use those microwave transformers for woodburning, which is insane! Don't ever do that, the chances of you dying while doing woodburning are very high! Great video really!
Excellent. Finally, someone did a well informed, experience based video on microwave ovens. Good to see the electrical safety from a reasonable view.
The toxicity of Beryllium is not a matter of opinion. Google Beryllium toxicity “risk assessment” and the first paper from 1997 provides the background. To summarize the exposure limit is measured in micrograms per cubic meter. Even war gasses from WWI are in milligrams. It’s not opinion. It’s fact. Beryllium is one of the most toxic elements known.
It’s use was banned many years ago. The risk today is cheap, fake, illegal imports. You rattle on about fake cell phone chargers. Importation of Beryllium insulators is a serious problem.
33:21 the easiest way to test microwave diodes is to connect them to a 9v battery and measure the voltage drop. At
Good to know
Thanks
I have not watched the whole video yet, so I'm sorry if you've already gone over this, but oftentimes, if the fuse is blown, the door switches will be bad as well. The idea behind the three switches is that one or two are normally open and the other one or two are normally closed. If the door is opened forcibly, instead of using the opener latch, the switches will change position in the wrong order, which not only cuts power to the magnetron, but also puts a short circuit directly across the input, which will cause the fuse to quickly blow. However, the switch contacts will also be damaged by the massive arc and by the heating, and often fuse together. I had a bowl explode in the microwave once (yes, it was supposed to be microwave safe, but I think there was a defect in it somewhere) By "exploded," I mean it literally blew into a thousand pieces, blew the door of the microwave open, and ejected bits of ceramic and food all over the kitchen. It was quite dramatic. My wife was the one using it, and I heard a loud bang, followed by my wife freaking out. (She was fine) Anyhow, The microwave did nothing, just like this one. I decided to take a look at it, and I found that the fuse was blown, and 2 of the safety switches were discolored and not working. Upon looking at the servicing instructions that were taped to the inside of the housing (this is typical of appliances in the US) I saw an explanation of how those switches are supposed to operate if something like that happens. I replaced the switches and the fuse, made sure the door and door frame weren't damaged, and the microwave works fine again. I even got the parts out of my dad's old microwave, which he had replaced because the fan had failed, so they didn't cost me anything!
Awesome video!!!!! Ty!!!❤
Interesting video. I would have thought that the reduced current demand shown on your clamp meter on start-up was due to the soft-start resistor being initially in the transformer's primary circuit, the current then reaching its full value when the relay switched it out of the circuit?
The relay turns on way faster than this. The lower current in the first 2-3 seconds is because the magnetron cathode is not yet heated, and so the magnetron draws no current. Only the lamp and motors draw some current and the rest of it is the inductive current of the transformer. Microwave oven transformers (MOTs) have bloody high inductive current with no load.
You are amazing!
hi Diodegonewild, this has been very informative and really love the way you explain how it works. Just one question, i have an old microwave which the membrane button started to fail and I'm trying to find out which part is belongs to start and stop button so i can dedicate a switch button to it. Is there any way i can identity which is start and stop button at the circuit board?
19:36 - I’ve got a microwave oven made by Galanz from 2013 or so, and its still has a schematic diagram inside the casing. Some Chinese washing machines also have a diagram next to the name plate.
3:33
We have already seen your face in your other channel and an old video in this channel
So why hide it now?
And on his website, too.
I’ve been wondering the same thing. The only thing I can think of is that he just wants to reduce the number of people who randomly recognize him in public or something
Yeah, that may be why
Yes
probably because he wants to focus on the subject of his videos and not on his face,
In addition, making videos with this shot allows us to see exactly what he sees and to reduce editing time!
So long
Yes please make a video about your tesla coil.😊🙄
My microwave does heat, but controls and the plate turns fine. My research says it’s the magnetron. Should I open it and test the magnetron as you shown in this video. Thx
Interesting Hahaha😄😄😄 the only problem is fuse...anyway thanks 4 ds video esp. Your beautiful explanation & unusual accent. God bless us all...Ave Maria!
3 wires on the fan motor because it is used to provide a 36VAC supply for the turntable motor, which is often a 36VAC motor these days, saving on the copper coloured CCA wire winding.
most common faults are blown HV fuse because of arcing, and a blown mains fuse, because either the lamp had failed short circuit momentarily before blowing open, or the switches are either faulty, or the plastic housing has warped, or the door is warped.
Thank u for your nice describtion
Can u further describtion about how decreesing voltage to the relay and if there is wiring diagram for resistors and relay
Thanks
For what its worth the mica window is to prevent anything from getting on the aperture, pinch-off, or insulator, which will cause flash-overs. If that happens, your magnetron will look like the Toshiba one he had that was burnt.
I was just watching 1 of your previous videos
@DiodeGoneWild Can you make similar video about UPS (Uninterruptible Power Supply) internals, explain how it works on the schematic and how to fix them?
33:46 gotta love the high voltage Žener
That MW oven is mint.
The power supply large diode is common along with interlock switches.
Hard✌️ I even had a microwave oven defective. Now I'm trying to repair it👍.
Last year my old faithful Bosch died after 23 years of work, I opened it and after following a couple tutorials on how to understand how it worked I found the HV capacitor fried leaking his own oil, after getting a replacement (in Bulgaria of all places) the old beast is still running
There are many 1 uF 2 kv small mica paper or polypropylene capacitor.Are this caps as dangerous as microwave oven cap?
Hi dude, thank you for the video, just a question: What is the brand of your clamp meter. it looks very useful and super handy, regards.
It's Voltcraft VC-330. I've made a video about it. The internals are the same as UNI-T UT210E.
th-cam.com/video/u0vaGpLXLEg/w-d-xo.html
I know that Panasonic has a patent on linear power regulation for microwaves, other manufacturers cycle the power like you explained. Love your videos, I learn a lot.
Remove the warning sticker to remove warning
27:39 Radiation hazard bloody heeeell 😂😂😂💯💯🆒🆒🔥🔥🔥🔥🔥🔥🔥
haha lol
you have a French extension cable, distributors in Germany are missing the pin in the middle, you can insert the plug in everyone properly
Do you think that the old type microwaves are more dangerous than the new ones?
I once found a microwave oven in the trash that had this exact same symptom where it wouldn't power on or do anything. I grabbed all the parts from it and threw it away, but NOW you're telling me that all I had to do was to replace a fuse?
Still, it was dirty and full of cockroaches so I guess it wasn't worth it anyway.
The microwave I am using now stopped working and I fixed it by replacing the input fuse. That was five years ago and it is still going strong.
30% of the time its the fuse, 70% of the time the fuse blew for a reason
the resistor across the HV capacitor is also quite high of a resistance. 1uF * 10M = 10 seconds. For the capacitor to discharge away 99% of its charge it needs to take ~50s or more.
how to repair microwave do not show power supply though i have checked all parts with multi meter and showed continuity. I have GE table top microwave. Please advise. Thanks.
Hello bro!
Can you make a video how to wind a high frequency SMPS transformer?
there are some calculation program's like excellentIT but we dont know how to fix(apply) them!
Thank you again , Caoi!
Some of these ovens have a smart timer dial where the first 10 or 15 minutes would be at finer steps, and then the steps would get coarser, the minutes would be more compressed. This is super useful! But i wonder how that works.
I also like those, but I have never opened one. It's a clever idea because otherwise the steps are too small. I only use about 2 - 3 minutes at most ouf of the 30 minute dial. Sometimes I only need about 30 seconds and it's almost impossible to set it.
Hi sir, may I ask how it is safe when one line of HV transformer connected to core, please help 🙏.
Thank you
Make an episode on a topic - under what conditions can the charger damage the phone.
You can also do a "crash test" as an example ;-)
How does the turntable motor random direction turning works? How the randomization is achieved?
The rotor is a magnet and the stator is just a single winding (single phase), so it creates just a vibrating magnetic field, not rotating. There's no shaded field, no starting windind, no other winding creating a phase shift (eg. using a capacitor). So it starts in a random direction. Some motors (like in timers) have a mechanism that seizes the motor if it starts in the wrong direction, so it bounces off and runs in the right direction, but this motor doesn'T have it. The direction doesn't matter in this application. It randomly starts based on the position of the rotor and the initial polarity of the voltage.