Audio amplifier repair
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- Опубликовано: 24 сен 2019
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I feel these repairing lessons are like stories, if I may. Sure, you can read the first page and the last one, and get what was all about, but the journey is the one that gives you all the fun. Thank you Sorin.
ps: more of audio is welcomed!
Am invatat mult de la postarile dvs. Va multumesc.
Just because it brought back memories. I fixed an old Sony 5.1 receiver amplifier that the relay got stuck cause someone crossed all of the speaker wires together at once. They got lucky, fusses blew, an only one relay shorted out (got stuck.) Part wasn't made anymore. Took it apart and flipped the lead on to other side, Sanded contact smooth. It fired up. Sounded great
I ran into the same issue on a rack mounted stereo power amp a few months ago. Symptoms were a bit different but it ended up being a faulty protection relay shutting the amp down when you brought the volume up to a certain level. I thought it was the driver transistors but replacement didn’t help. Had to order a new relay from China but that was the issue. I work mostly on tube gear but try to work on anything to learn. Your videos have taught me a lot of good troubleshooting methods. Thank you for sharing your knowledge Sorin ! I just dig your laid back demeanor. You never get upset or frustrated when most of us would trash it. I am tenacious though, I will keep trying until I get working. The only thing that I threw in the towel on recently was some Peavey class H design power amp/mixer that burned the bridge rectifier on the low power supply of the output, that high and low power supply of that class H was pretty confusing to understand. They only used that design for two years and went with a class D switching power amp. Obviously it had issues and was expensive. I did salvage a nice multi tapped toroidal transformer out of it.
The dodgyness meter went out of scale!
hi everyone ,if anyone else wants to learn about
electronic repair manuals
try Saankramer Electronic Magazine System ( search on google ) ? Ive heard some pretty good things about it and my buddy got excellent success with it.
Awesome. Love your videos. PLEASE more videos like this. Repairing subwoofer amplifier. Golden regards...
Nice job Sorin
I think it’s a practical solution not a dodgy job
Thank you
BANG !!!! :) i learnt the hard way about cut out relays ! picked up a marantz pm50 amp from a bootsale with a denon cassette and a graphic all for a fiver !!! one channel wasnt working on the marantz as the relay wasnt clicking, so i shorted it ???.........which then passed DC thru my pioneer speaker !!!!............wont do that again ! lol.
Excellent repair and exciting to watch! Thanks
As I already wrote on another video I like this new kind of videos (Power supply , Amplifier, Building things)I can't wait for all this new challenges
Hello from Albania from my Romanian wife Anamaria. I am actually Slovakian living here in Albania. I am big fan of yours too and subscriber (only few days :)). Love how you show your repairs. I wish I was there to learn from you as I am starting with electronics. Id love to do what you do in the near future :) All the best and cant wait for more videos.
Congratulations teacher, once again, the ability, knowledge and ingenuity of man; they have triumphed.
I watched 'Chernobyl' TV series three times. Its probably the best TV series of all time.
"ah, the sound of a working amplifier"...I was dying to see your colleague come up behind you and shout BANG !
Hahaha! You create a 'dodgy solution' and the conclusion is: "perfect, absolutely perfect!" 🙂
Very interesting to hear story from a board.....this worth a like n thump up..thank sorin job
Want to have fun? Insert a couple of 100 microfarad electrolytic capacitors in an UNPOWERED mains socket for your work bench, hidden if possible, don't want to hurt anyone. Ask you co-worker to turn on the bench power. Make sure your standing back.
Good job repairing the amp. I repaired many amps years ago, brought back good memories.
Thanks.
Helpful repair video 👍
Always have some whiskey around for some liquid courage. The bangs are something you never get used to
Yes those are input an output speaker terminals the board does the processing those Sansui blue relay are abundant
1:12:18 Is this a toothbrush? YES.... I've felt of the chair... This is so funny.
Nice. I'm all for Mc-Gyvering a relay contact as long as it will run reliably. And I think it will. The relay may last longer with a cover though.
That’s crazy. I was super amazed by how the Chernobyl reactor exploded lol. I was 14 when it happened .
lol, "let's get someone to power up" :)
1:12:00 That's why I watch every video of this channel. Learning, while having a massive fun... Good job, Sorin.
Do you know a good reason why I like the video before I hit play?
Good approach, who would doubt a discrete relay?
Never thought I'll see so much action on this channel, that was more nerve racking than the last James bond movie :D looool
first story in the book is very hard . Great book at all :)
Absolutely amazing. You are so knowledgeable in the way you can visualise a basic schematic in your mind. That comes only from decades of study, dedication and a solid understanding of electronics. Well done!!!
I repaired my first ever switch mode power supply when I did my work experience. It was part of the course at RMIT where students would have to do work experience in a professionally established repair centre. The techs would fix CRT monitors, camera's, computers and more. The day, I said to them "I'm ready and I'm about switch it on to test" one of they technicians went and stood by the buildings mains power meter box - ready to reset the circuit breaker. They were all expecting a huge bang. No bang, no smoke just the joy in knowing that it worked. Challenge successful that day. :)
It's his birthday today, let's power on! Made me laugh :D
Nice work :-)
WOW ! I never thought someone would go as far as to fix a RELAY ! :))))
hello bro i have xpria z2 its fall in sea water do u think it will work again?
Hi Sorin good night from Mexico ....
I Like all your video's, and notice that you lose a few screws along the way. Time to get a dedicated screw dish to put them in.
wow humming say what the power this old amplifier
nice sorin
Very Good, Would you know where I can get a Schematic or service manual for a NEC AV-350E?
Thanks
Hi Sorin Magician !
Really interesting. Looking back you actually reproduced the fault when you added only one voltage supply the transistor and resistor got hot as it probably had during the original fault. I must admit I am wondering if it would have been better to source a new relay. Do you think the contacts on the relay maybe not closing at the same time ( assuming different contact distances ) may put a bit of strain on the output pairs. Was that effect over time the original cause of the failure. Time will tell. Nice to think about though.
It’s a birthday... on/off....... brilliant :-)
thats a prety nice present
Nice book 👍 good friend
sir to be sure the device is not going to explode after working on it
u can simply test with diode mode the input (Ac input) for short
if it reads mean it definitely going to spark or explode, if it doesn't read you free to turn on the switch😁
Mono/sub amp often has auto turn on function when voltage at rca input reach a specific level, thats when the relay turn on
probably u r right
Well this is a notebook repair store.. so you should expect a repair "solution" like this .. This one was good i like it
Nice vidéo. It would be better for electronics students to know that during soldering, flux is highly toxic on the long term and that it would be a good idea to have a flow of air. Air vacuum, something like that.
Great Geekax Not the flux this guy uses, it's totally natural! Watch his vbid about it...
Depending what flux you are using and from where you know it ;) The flux (natural pine rosin) is not toxic at all, however it can carry with the fumes microscopic particles of lead from the solder and any burnt debris from the board (including plastic and any substances accumulated on the board over the time). In any case, you would probably have to do it for some 50 years everyday, for it to kill you. I don't worry about it (I will die way before it ;) from different causes.)
LOL... I'm still shaking my head! Still finding great entertainment though- Thankyou
Hi, can you please tell me what microphone you' re using in your videos. I like how it isolates the background noises. Thank you.
Awesome
Hi frend
Watch my channel
Good luck 🙏🙏🙏🙏🙏
🔉🔉🔉🔉🔉🔉🔉🔉🔉🔉
🎛️🎛️🎛️🎛️🎛️🎛️🎛️🎛️🎛️🎛️
apply 24v dc directly to the coil of the relay
Hey Why do you take the red Strip to gnd?
Sorin Build's his own Air Cooled Relay...lol
I like what you did 😍 you repair the relay 👍perfect job. Crazy mind 🚩🚩🚩
that relay is for protecting your house fuse not to go off. Because you have a huge capacitor which makes short for a second and that burn your house fuse. So first resistors power up capacitors and than relay turn on.
You should put wreck and repair on the titule
Holy smokes, i can't see what do you did to that relay. Absolutely crazy. This type of relay is very common in upses. Its cheap, about 4-5 bucks, not wearth the risk
my eyes are bleeding now. I don't believe he make this
read the video description ,
@@CraZyButRich Can you say that you watched the video all the way through, and then believe that? I find Sorin very entertaining - he comes across as a lovely guy, he's obviously got an exceptionally good grasp of how electronic circuits works, and how to make them function again. It's obvious that his employer offers fast cheap(ish?) repairs, and Sorin needs to use the methods that he does to make that work. But would you take any of your devices there to be repaired? Would customers be happy if they saw how their devices have been made to work? I have little experience of carrying out electronic repairs - extensive experience of electro-mechanical repairs though - and some of the repairs shown in many videos make me wince...
@@will_doherty if you see what surgeons do to repair the human body, you wouldnt go anywhere near the operating room either lol. And even surgeons need to know their field well enough to make do in a pinch, like in a 3rd world setting, for example. QOS does go a long way, but hands-on fixes with sheer logic and common sense? Priceless, especially for us learners! I've never seen the inside of a relay before, yet after this i will never forget.
@@faizelosman3462 How could you never have seen the inside of a relay? There are many, many relays that have clear covers......
I love when you had Christian power it up. What a fun moment! Hahahah....
I keep thinking Sorin saying F......d and not stuck lol
Sir please put the AV receiver trouble shootings if possible
You can not ask 60 ponds for that but for emergency repair it’s nice
Attention!!! You SHOULD say, that the capacitors need to be shortet, to prevent an electrical damage on u, if u touch them.
Men long run. Nobody electrocuted 😂blowing up
that was another nice entertaining video...
that " sound of a working amplifier" he said at the end may have ruined it a bit?; i do not know for sure,i am just an hobbyist,not a pro like he is,,
also,no BIAS ajustment there?
but i was just reading on a SAE Mark III amplifier "repair hints ",they call it, they have a WARNING not to do that,never to do those thumps;
their amps are of extreme bandwidth, they say, and our body being an antenna to RF ,the Amp can easily be ruined by doing that; i have noticed that danger over the years and many Amps, that sound SCARES me...
and i seem to have noticed that by the 3rd time,the sound was weaker
audio repair is a delicate business,you need a lot of test gear by what i have seen on utube, i am trying to repair a 1998 Yamaha 125+125 watt amp and i know less than 1/10th of what i should know, but i will fix it
Ooh - that's the book the Chernobyl series was based on - should be good!
Hello Sorin! Come to Besiktas... We drank alot of radioactive tea in Turkey...Chernobly times....It's just sad.and I need some help for iphone 5s..
Salut Sorin,din ce oras din Romania esti?....Multe salutari din Timisoara...te urmaresc cu mare drag...
Hello, I have 5.1 surround sound system here is the problem
Couple of months ago it stopped working, as in it doesn't amplify the input sound to the speakers.
But just yesterday, accidentally I plugged it to 110v source(normal 220v) and it worked, of course there is a buzz sound coming out it(I guess that's because of low power), on 220v it's still not working.
What could possibly have gone wrong?
a input serial lamp and no explosion :)
on and booom or not :P lucky guy
Hahahaha poor Christian, sooooo funny
sir you are gate. i like your videos
Apreciez munca si cunostintele dar nu as face o reparatie de genul, as cumpara un releu nou si l-as inlocui, ma gandesc ca exista un magazin de electronice de la care sa cumpar sau in cel mai rau caz comanda online. Doar ptr urgenta maxima as face asemenea reparatie. Salutari din Romania :)
:D Dude you should put the relay in to the bin and just put a new one.. They are cheap and this one is may be the most common on the market. I tryed to fix many relays and never work as they should. Once is overheated the mechanical properties on the contacts are gone, and it is easy to stuck again, even with a very small loads. If it work, it is for few times and soon fails again.
like sir
if you want lots of cheap transformer ....go to scrap yard...and you will buy the scrap transformers by weight...so is like 1 pound for transformer like in that unit....just be careful that they have not been torn to bits by the person who scrapped them...you will definitely find some good one.
First,you have a chaotic workbench. Buy a silicon map
Ok, this fix was on McGyver level !
Hi, do you need a trailer, screen saver, design for the channel?
That's repair work for you.
Buna ziua,
Ce sursa aveți pe birou? Va mulțumesc in avans pentru răspuns! Salutari din Germania!
92v cricut worth to check with 100w bulb series.
it,s safe
Tap on relay too see if it sticks lol
common nc/no contacts.. since u found out what was the faulty part, u should had replaced the relay. if the contacts are dirty, u just clean them gently. but other than that u just replace the relay. since the relay is using the NC contacts, means the contacts must be able to handle all the current. means if the contacts are not in perfect condition, they will get hot. getting hot, means melted plastic........
Those burned resisters should be raised further off the pcb and I would increase thier wattage.
Is that relay for in rush current protection. I doubt its for input detection.
Mr. Carlsons lab would find the cause of the relay failure and redesign it. Watch his videos!
Yes, you are right. Mr Carlson would - but again Paul is not in a shopping center repair booth and he doesn't work fast/cheap to survive. I'm sure that Sorin, given time and money for a real solution, would do it, but he is NOT an inventor or radio/amplifier specialist. Sorin is a technician working with what he has available (very little) and fixing things successfully. This is his great ability. Look at Mr Carlson's workshop (or rather a laboratory - like he calls it) and all the fancy and top class equipment he has at his disposal and compare to the (work)SHOP of Sorin. Yet Sorin is very successful.
I Would Of Wrapped 1/2" Piece Of Kaptan Tape Around Relay, Maybe? LOL I Know You Replaced w/New Relay. Butt Great Trouble-Shoot Video! Thanks Teach... PS I Suggest A Magnet On Desk To Hold Screws Soo You Don't Loose Them Anymore? Hmmm... LMAO
how i can join u
The screw missing at 1:03:45 fell of the desk at 16:25 :)
why not get a solder sucker 2 pounds on ebay...and most people just use a small container to put screws.....i mean after many years...why are you still losing screws.....its not rocket science to use a small container when disassembling stuff.
I wouldn’t want this guy repairing my electronics. He is an amateur. If you enjoyed this video, watch Mr Carlson’s Lab, Glassslinger or Xraytonyb. These are the Professionals when it comes to electronics troubleshooting and repair. You’re Welcome!
Replace the relay with 3phase contactor with overload rated with 10amp. 😂
If it me I will replace the relay with MOSFET to switch negative side and FET to switch positive side. And use voltage divider to knock down 24 volt to 12 volt for controlling the base pin
Sorin, you lose a lot of screws :)
If you don't like the idea of pressing them onto butyl tape on your bench you could cut up a flexible magnetic sign magnet into small pieces. Example ebay item 332945032106.
Or cut up an old fridge door magnet into six inch strips.
They're very weak magnets but plenty strong enough to keep the screws from rolling around.
Thanks for another good video :)
Audio AMP doubles as magic smoke generator.
PETROL PETROL PETROL PETROL.
Times like this you wish maplins were still about it would of cost a fortune but it would of been done.....
1:12:20 the sound of a working amplifier..
I'm so late today class
Greetings from Romania. Ask your colleague about palinca.
"There is no way can be more than an half hour" cit.
Be back soon the large capacitor was bulgy looking and looked leaky on the tracts, that really didn't melt because it was tired.