there is not one way to fix a piece of electronics the way you do it is what is best for you and there is nothiner wrong with the way you fix anything as long as the results are the same keep up the great work you are a very skilled and talented and knowledgable person and never chage
@@Bruceanddenise , Although I didn't thumbs down this video, his lack of proper repair protocol does rankle a tad. Frankly low class soldering method (such as no obvious desoldering equipment or use of flux) and other things such as mentioning that the age of the unit indicates a need for total recapping with high quality caps (AND not knowing that ESR does NOT show whether a cap is or is not bad). He needs a proper education in how to fix anything electronic.
Dave, great job as usual, but let me tell my one (OK, two...) "complaint"(s). 1: I would have replaced that transistor on the same stage of the other channel as well, because they're now of different type in the two channels, which can cause channel mismatch (either gain, and/or frequency response, phase shift differences due to different Miller capacitances /if it's in the first stage of the phono preamp, usually this stage rely highly on Miller capacitance to determine the high frequency rolloff/) 2: I don't like spraying Deoxit on board mounted stuff. The oil residue will spread out on the whole board over time and add an oil film to everything. I've never used actual Deoxit (I think it's not available in Europe), but every contact cleaner I tried do this annoying oil creepage stuff. Thats their job, but I don't like it on the PCB surface. I've seen PCBs destroyed by this, as the oil ate up the rubber sealings of the capacitors, and than the leaking electolyte done its corrosive job on the traces and component leads. I used to remove everything I want to clean from the board, and if possible, disassemble them, and do the cleaning part by part. This is extremely labour intensive on huge pin count PCB swithes like these ones, but this way, you can remove the oxide layer, while if you just spaying it with Deoxit, it will dissolve the oxides, but it will stay on the surface as an oily goo. I use contact cleaners, but I wash them away after they done their job of dissolving the oxides, then I use silicone grease to protect the contact surfaces.
Awesome, fantastic, enjoyed you working through and solving the issues, I have crackly sound hopefully I’ll only need D.5 spray otherwise I need to send to an expert like you. All the best.
Very good... Neither I discard a part ( in this case a relay) that is good but with some blemishes... I try to revive them and revive them... A good dedicated work... Post more... I work in much similar way... Some times I improve the components.... On some high end and beautiful systems, I "laser engrave" the front and rear panel....to their original...
Made me nervous when you started cleaning potentiometers and switches. I guess if you have done this type of work as long as you have you don't sweat the small.stuff. excellent video.
I did one of those not that long ago and cleaned the relay contacts as well as all the switches and controls. That relay gets kinda hot. I had a problem with the phono input contacts that took me awhile to fix. Had to take apart the rear boards to get to it.
love your videos!! I have a feeling that maybe you're every day job is a teacher? It definitely seems like it. Your videos have taught me a few things, but they have also given me the wisdom to know when it's time to forward whatever issue I'm having to someone like yourself.. sometimes I don't have the correct tools or knowledge/experience and don't want to break my project further haha. anyways, keep up the good work. I'll always be looking forward to the next video of yours! Much love from Sacramento!
My day job is actually the phone company. Well these days it isn't so much phones, it is internet, TV and fiber optics. I do have an engineering background though.
This is a common way that transistors fail. Heat and cooling is a fast way to pin point. I use just good old duster and invert the can so the propellant sprays out. Cools to -70'C
Assholes give thumbs down due to spite because they know they can't do what you do its jealousy my friend if negativity didn't exist then we as people wouldn't exist misery love company but me I love watching what you do its talent
Hola! Soy andres de Argentina, como puedo porme en contacto con 12voltvids, tengo un problema con un amplificador yamaha y necesito ayuda..Mi correo electrónico es musicologi@hotmail.com.
12voltvids Hola, como podria ponerme en contacto con usted? mi correo electrónico es musicologi@hotmail.com tengo un problema con un amplificador yamaha..
I am not a janitor, and people are not paying me to wipe the dust off the inside. they are paying me to fix the problem, nothing more. A little dust inside isn't going to hurt it.
@@12voltvids l know, it's just me being a weirdo about dust. I have to wipe it off and give it a blow with air. You videos are fantastic, i've learned so much from them.
Dave, ignore the thumbs down people. They are not even worth mentioning. Your work is awesome! You, sir, know your stuff, and I salute you for sharing it. Thank you.
Wow this comment section is pretty negative with the trolls and idiots. Would love to see some of their perfect soldering and more important their diagnostic skills. Cool vid as usual, and don't worry about the thumbs down, in fact invite them to do it more, YT algorithms don't discriminate between thumb up or down, it's all interaction and helps your vids out! ;)
Thumbs down on the abysmal reflow of that relay? I won't give a thumbs down for that. Flux would have helped and a bit more heat. I've been soldering for decades almost daily. The sight of that did make me kind of want to loose my lunch.
Always learning from your videos and always amazed at the work you do. I realize you have years of experience but still, wow. Thanks for the video. Working up the nerv to work on my Pioneer SX-850. Got it for free from a neighbor in mint condition. Controls are scratchy and some caps are bulging but watching you vids are giving me confidence
Thank you! This amp is my favorite in my collection. The sound it produces is unbelievably good to my ears. I use it for my turn table. I have the power / right channel low sound issue with a bit if crackling and i bet you it has to do with a dirty relay as shown here. I have always powered it on and off 2 or 3 times until i get clean sound, listened to my album and have always wondered why it did this. Now i can open this thing up in confidence. Thank you for taking the time to put these videos together.
it is necessary or it will fail again that joint a 6.20 wasn't wetting and more solder was being applied than was necessary and if you are going to take the relay apart at least de solder it from the board
thehappylittlefox is absolutely correct about the soldering this guy does. I have never seen him use liquid, or gel, flux when he reflows connections. This results in excessive heat. Could result in lifted pads and runs, also dead solder. Dead solder will result in cold solder joints. It must be removed, prior to reflowing connections. Use solder wick, solder sucker, or a soldering station with a vacuum pump. The soldering methods he uses may cause more faults to occur. They may not manifest immediately. Excessive heat will cause damage to the board and result in damage to components that may cause them to fail prematurely. There are several good basic soldering technique videos on RUclips. I suggest anyone that intends to do repair work for paying clients learn acceptable, high quality, soldering techniques. Not doing so will result in returned repair jobs, or loss of business. Reputation is everything to a repair shop. No disrespect intended toward this gentleman's troubleshooting ability! I appreciate his videos too. My credentials: US Navy Advanced Electronics Technician, certified to NASA standards for Micro-miniature repairs (2M).
@@Myname549 I like to clean soldering iron tip after every two reflow joints to keep from having too much solder gobs . This if not using solder wick to completely clean the joint.
We all have our way of doing things! I use a single shot desolderer and reflow a joint!.......not a spliff???. My biggest gripe is seeing anyone not using needle nose pliers to shunt heat away from transistors as they solder them in! I also think it's about time we got back to point to point wiring when manufacturing anything, especially valve amps or tubes as you disgusting yanks call 'em! Really?? Printed circuit boards are ok for low power low heat use! Toob sockets should be mounted on the chassis not the PCB! Why do a lot of audio companies do this? Cheers from OZ Andy! XXXXXXX
@@Myname549 I agree, I would have removed the old soldier, cleaned the connection and appalled new soldier to the pins. anytime there are pins like that on a relay, transformer etc. that's what I usually did.
As luck would have it, my 1990s Technics amp has a very similar problem with the R channel (it's usually fine, but at most annoying times can all of a sudden start crackling and go off entirely, and usually i get it back on by switching the input selector knob a few times - there's no doubt the knobs have dirty/oxidized contacts, too), and i've been waiting for a time when i'd have a clue on what to do about it. Never opened up an amp before but this seems like a good time to start. If anyone reading this comment has any other ideas on what else might be wrong with it and if its self-serviceable, please let me know :) Even a long time from now, since might be i won't be able to fix it (likely if it requires anything else than shown in this video.)
Wow thank you very much. This is the best video for repairing amp. I always wonder how they do it but now i am confident i can do it also. This channel will always be my reference and you are the best teacher in the world.
Hi. Thanks for the great videos! I'm an avid viewer. I have this exact amp. I rescued it straight out of the trash. Could you offer some assistance as I have a Yamaha M-60 power amplifier and I trying to connect it to the CA-600 and use that as a pre-amp but when connected it just doesn't seem to transfer the power. Is this because the input voltage is different between them. The CA-600 is 0.775 volts and the M-60 is 1.24 volts? Thanks for any assistance you can offer.
My Yamaha natural sound RX570 is horrible for attracting dust ... the power switch, the controls, the natural sound button, need to be cleaned every couple months ... where as I have a optimus AV system in same room ... never had a problem with dust migration ...never had the cover off of it... can't say that for the high dollar yamaha.....
After watching this video, it's a great argument for bringing back point to point wiring. Primaluna tube amps are point to point with some small pcbs for holding an LED in place. They're total garbage in a beautiful amp like this. PCBs are no ones friend.
Thank you very much for the tips. I fixed my Sony SRT-SE501, I found a lot of cracked soldering, the relays were clicking randomly and left channel had crappy sound, now it's OK.
Hi.. i got a similar one at home... the CA-800... same kind of cleanup to do... but i also got a Photo input problem : no sound from turntable in the Photo1 or Photo2 input... Do you think the problem could be from my Turntable output ??? i aint got a second amp to test the turntable...
C502 (2200uF Electrolytic Capacitor) on the ACC Line at the Input Jack is Bulged on top but not Leaking...measures Infinity. C315 (470uF Electrolytic Capacitor) on the BATT B+ Circuit is also Bulged on top but not Leaking...the bottom is blown out on this one. Both are in Parallel with + & - and are not Shorted . All Solder Joints & Traces look fine as do all Components & Board. The Unit doesn't light up at all.
Nice repair. Yeah, good old JB-Weld has gotten me out of a bind many times too. And as far as the turntables, yes hang on to those legacy turntables. I still have my DUAL and Technics from the mid to late 70's. 👍
I think it dreadful nobody even gave you a single thumbs up as it was a great video well done man, at least you did not do as bad as me, I gave a Romanian lady in the space of 8 months €46,000 and believed everything she told me but it was my own fault, I am trying to repair electronic stereos TV's and hi-fi systems to make some of the money back, I don't know why more do not at least say something about all of your hard work I think it unfair.
Great repair job. I wouldn't worry about the thumbs down. The ones who do are just trying to impress other techs and to make them selves feel better at the end of the day. I been a service tech for over 36 + years and there is one thing I noticed. A true tech will praise another tech on job well done. Your videos are great!
Thanks. Yes I have been a qualified AV tech for at least 36 years too. Started studying electronics when I was knee high to a grass hopper. Built my first Heathkit, in 1976 that was the GC1005 clock. Then built a full stereo receiver (still have that, will be servicing it one of these days) when I got out of high school, I studied electronics with a private instructor, at the first shop I worked at. He had been an electronics engineer in the military, and built RADAR, and radio installations during the war. He knew his stuff, and drilled me with theory. After 4 years of Special High Intensity Training (SHIT) I wrote the challenge exam, and passed with flying colors. Same exam that were used in the technical schools of the day. Covered tube and solid state theory, transmitter and radio design ect. I got a job with the Sony Canada, and worked for a year in their service dept, where I learned Betamax, which was invaluable as VCRs were just coming into the market. Sony wanted to transfer me back east to head office, and I didn't want to re-locate, so I left, and ended up at a large independent authorized service center where I did warranty work for Sony, Panasonic, RCA, Toshiba, JVC, Samsung and LG. Left the industry in 2003 to change to a different line of work, but I just can't leave my past behind. People in the community know me, and I get constant things to repair. It has slowed in the past few years, and I am quite pickey on what I will work on. If has more than 2 channels for example I am likely to pass. Big high power 2 channel amps, and tube amps are my favorite.
From your Experience... why would the ACC Circuit measure Infinity from the ACC Pin to Chassis Ground? Sony CDX 4090? Batt Circuit is in the 1 Meg Ohm range.
Actually it does. By the time one gets here with postage and broker fees it is about 65.00. Yup 65.00 for a 5.00 relay. And no the customer doesnt want to pay for it because it was an amp that he was flogging to some sucker on ebay. So he doesnt care if it breaks in 6 months or a year because he won't be using it.
Hey i have a sony cx333es cd player that has bad rca contacts can this be fixed? A par of rca fixed out dont work as all the others cut in and out if wiggled
Because I wasn't being paid to do that. I was 20.00 to repair the relay. The owner wouldn't even spring for a new part. VERY few and I mean VERY few want anything more than the bare minimum done. I never get people showing up saying check everything and bill me whatever. Evenrone is just concerned with getting something running so they can sell it to someone else. Putting a couple hundred dollars into a total rebuild does not guarantee that they are going to make their money back. My customers buy stuff at estate sales, and from facebook market, and get it fixed as cheap as possible so they can sell it and try to make a profit.
I always give you a thumbs up! I've watched over 100-150 videos of yours, I might be wrong, but maybe you talking about "people giving you a thumbs down", WILL make you end up with more thumbs down than if you would have not said anything about it!
Sounds good, that receiver probably would sound great on big speakers. Watched your TDK was that the brand on your stereo drift. I did an alignment on a Denon , very similar problem, they have a stereo /muting switch. Note: I found that if you are super close to a transmitter you can get wash over or image issues with FM stereo. I am a mile outside Chicago, some times if I go up on actual signal, & this is a Digital readout my stereo /signal light will both fire. It looks very similar to your TDK.I am going to walk up a flight & get model & I'm back. { Model is a Denon -precision audio component / tuner amp DRA -300 it has a stereo muting switch for FM. I did an alignment with DMM , it sounds really good massive heatsink. Finished metal cover in black crackle spray paint. Take care ,Hugh Mc. Chicago , metro PS : The 2SC1345 is a low signal NPN amplifier transistor with a collector to emitter voltage of 50V and collector current of 100mA. Good repair on the Yamaha, yes thumbs up !!!.
@@12voltvids my buddy that does audio in Mantooba has six or seven crest amps in a rack for live/stage stuff. Great amps. He gets lots of, "If you ever want to sell those . . ." comments.
I can actually hear the feditly change as you cleaned it my equipment used optical out from tv to sony str DA4es on 2 infinity sm155 studio monitors nice job 👍
Your patience with some of these modern "throw away" electronics is admirable. and yeah, the hell with the Thumbs down. Obviously jealous. even with the more difficult repairs. simple common problems are (purposely?) so inaccessible, it's barely worth it but for the challenge. Keep up the great work and videos. I enjoy them immensely!! and yeah, i'm jealous... but in a good way.
I won't be giving a thumbs down--it is one's' prerogative to do so however. This is a free country and suggesting anything else is un-American.... I am perplexed by one thing. Apparently the CA600 unit is used in a metal shop or high carbon dust environment. Did you brush off the boards a bit before assembly to alleviate the collected dust? Wouldn't common sense dictate the thought that carbon dust conducts electricity?
Your comment about no sparks reminded me of an old poem that turned me off working with 240 volts forever! "Pair of pliers, electric wires, blue flashes, now ashes". Slow but fascinating video.
Hi, been watching a lot of your videos and I admire your work, im in Brisbane Australia and have a loudspeaker repair business, I need your help with info if possible, I have 2 amplifiers, both Luxman, one a L100 and the other a M2000, both have intermittent problems, one channel has random crackling, its hard to pinpoint as it comes and goes, the L100 has had the channel completely rebuilt, I mean every component...and still has issues, the M2000 has had all capacitors replaced and driver transistors on the main pcb...no change...im at a loss...
Very nice fix, subscribing. I have the same amp and switching it on does nothing. After checking fuses, any advice what to look to first? second? I have the overall schematic, block diagram and internal view copied. Thanks Dave for the teach.
Hi. In what city are you located? I would like to bring you some components to fix if you would take them. Shipping back and forth he's too expensive, so a nearby tech is the only affordable way to fix stuff for me. Thank you
Great job, just came across your channel im fixing a similar one for a client with many issues but these are good receivers. Also great channel just subbed!
I have to find a new stereo because mine had a lose bracket inside it that got on power supply bord and was laying on they rectifier ICs. the bracket got hot enough to melt all six pins on the rectifier ICs and the fell out of the board. after rectifier ICs fell out it allowed AC to go throw stereo killed ever thing in my channel master stereo.
hi there! Great vid , I'm a beginner, still on classes and If you allow me to make a question.. I'm fixing a technics SA DX940. It does power on as soon I plug the AC but the front panel can't turn it on. Fan runs for a bit while and stops. Maybe a protection mode...I also identified that the power transformer is outputting about 20% more voltage it should and It algo has a buzz sound. Is it acceptable? Would this power transformer failing? Really thanks for your time! :)
+curiosidicas - It would be a VERY unusual failure for a power transformer to output more than it's stated voltage. Conceivably some shorted turns in the primary winding could cause it but the shorted turns would also cause overheating/odor/smoke. More likely, if your readings are correct and it actually is putting out excessive voltage, the cause is probably an incorrectly set voltage selector. Some appliances, particularly those intended for international use are equipped with some means to match the device to the line voltage of the location it is going to be used at. Typically the selections will range from 100v to 240v. If the selector is set for a voltage that is less than the input line voltage the transformer *will* output more than it's intended voltage. If the difference is not too great the unit will probably still work but the power supply and other areas will run hotter than they should, which will eventually cause something to fail. So unless your transformer is overheating, look for a misadjusted voltage selector.
If I am happy watching this I am sure the owner will be too :), good job! Btw I think the dislikes are coming from some kind of bots crawling RUclips for victims.
Regarding your reflowing solder ; technique I learned in the military is a final sweep up the leg of the component to pull the solder into a “Hershey s kiss” finish ; less chance of solder bridges . Thoroughly enjoy your videos
Yamaha audio and motorcycles. Honda never made audio devices, did they? That relay reminds me of the voltage regulator in old cars. (Although the ones in cars was much much larger) I guessed it was a transistor.
Love the old Yamaha amplifiers. This definitely looks like a higher end model. Would really love to get one of the new high end A-S1100 amplifiers with the classic style needle VU meters. Excellent sounding amplifiers from what I hear. Great video! 🙂
Curious that phono pre-amp noise. In the last week I've seen that same noise (in person or on YT vids) here, on one of Dr Cassette's videos and a modern 'Sansui' branded integrated amp I bought off eBay. And three different diagnoses -- transistor fault here, b0rked selector switch (DC) and a badly-soldered op-amp on my own unit. All with more or less the same symptom.
Yes a dirty switch can cause it. So can a bad connection. I looked at that first. I cut the part where I re soldered the preamp board because it didn't cure the problem, and the video was already long enough. If you see my watch in the shots you will see how much time was put into this unit, which was about 4 hours.
Absolutely brilliant It has been many years since I have seen such attention to detail within your Component level diagnostics... It was almost serene observing your methodology. Many thanks!
Great video! I have a question though: I have the CA800 but can't get rid of the hum and buzz problems. Do you think that this is a "standard" issue? Is there a way to bypass it? Thanks!
Actually it is a class B amplifier. All push pull amplifiers are class B design. It is biased as a class AB amplifier, which means that the 2 output stages are biased into slight conduction so that neither transistor goes into cut off, as it is the hard cutoff that causes that nasty cross over distortion. You take a standard class B design, and add a resistor in each of the output states to prevent cut off. Same with tube amps. Guitar players would often modify their tube amps so they could go "dirty" which was done a few different ways. One way was to over drive the crap, and the other way to under bias the output.
Thank you - this led me to solve the channel dropping issue in my amp. I popped the cover off and mine wasn't broken like this one - but I cleaned the points with electronics alcohol and a small piece of paper soaked in the same liquid.
there is not one way to fix a piece of electronics the way you do it is what is best for you and there is nothiner wrong with the way you fix anything as long as the results are the same keep up the great work you are a very skilled and talented and knowledgable person and never chage
Don't know why people would thumbs down your vids, they are very interesting and informative. Thanks.
Very nice and straightforward repairing . It seems that no punk dared to give it a thumbs down. Love Yamaha gear by the way. Thanks for sharing.
Thats because I disabled them for this video which I should do for them all.
Why the hell would someone thumbs down this video? Great videos.
Some people are just vehemently opposed to JB Weld. They probably don't laugh at cat videos either.
Broken relay contact and worn contacts= replace the relay.
@@rickclink9196 shipping cost worth more than the amp
@@pvb9964This amp is worth about 300USD. IMO.
@@Bruceanddenise , Although I didn't thumbs down this video, his lack of proper repair protocol does rankle a tad. Frankly low class soldering method (such as no obvious desoldering equipment or use of flux) and other things such as mentioning that the age of the unit indicates a need for total recapping with high quality caps (AND not knowing that ESR does NOT show whether a cap is or is not bad). He needs a proper education in how to fix anything electronic.
Dave, great job as usual, but let me tell my one (OK, two...) "complaint"(s).
1: I would have replaced that transistor on the same stage of the other channel as well, because they're now of different type in the two channels, which can cause channel mismatch (either gain, and/or frequency response, phase shift differences due to different Miller capacitances /if it's in the first stage of the phono preamp, usually this stage rely highly on Miller capacitance to determine the high frequency rolloff/)
2: I don't like spraying Deoxit on board mounted stuff. The oil residue will spread out on the whole board over time and add an oil film to everything. I've never used actual Deoxit (I think it's not available in Europe), but every contact cleaner I tried do this annoying oil creepage stuff. Thats their job, but I don't like it on the PCB surface. I've seen PCBs destroyed by this, as the oil ate up the rubber sealings of the capacitors, and than the leaking electolyte done its corrosive job on the traces and component leads.
I used to remove everything I want to clean from the board, and if possible, disassemble them, and do the cleaning part by part. This is extremely labour intensive on huge pin count PCB swithes like these ones, but this way, you can remove the oxide layer, while if you just spaying it with Deoxit, it will dissolve the oxides, but it will stay on the surface as an oily goo. I use contact cleaners, but I wash them away after they done their job of dissolving the oxides, then I use silicone grease to protect the contact surfaces.
Awesome, fantastic, enjoyed you working through and solving the issues, I have crackly sound hopefully I’ll only need D.5 spray otherwise I need to send to an expert like you. All the best.
outstanding job on fixing that yamaha and super job finding the bad part again super job and i love watching your shows
Very good... Neither I discard a part ( in this case a relay) that is good but with some blemishes... I try to revive them and revive them... A good dedicated work... Post more... I work in much similar way... Some times I improve the components....
On some high end and beautiful systems, I "laser engrave" the front and rear panel....to their original...
Made me nervous when you started cleaning potentiometers and switches. I guess if you have done this type of work as long as you have you don't sweat the small.stuff. excellent video.
I gave you a Thumbs Up..your Videos are Terrific. And The Goal is to make the unit/object operational no matter what. Cheers!
WOW! I haven't seen a chassis like that since 8-track days!
Thumbs down people have pathetic lives. It makes them give a sense of satisfaction to put down others.
I did one of those not that long ago and cleaned the relay contacts as well as all the switches and controls. That relay gets kinda hot. I had a problem with the phono input contacts that took me awhile to fix. Had to take apart the rear boards to get to it.
love your videos!! I have a feeling that maybe you're every day job is a teacher? It definitely seems like it. Your videos have taught me a few things, but they have also given me the wisdom to know when it's time to forward whatever issue I'm having to someone like yourself.. sometimes I don't have the correct tools or knowledge/experience and don't want to break my project further haha. anyways, keep up the good work. I'll always be looking forward to the next video of yours! Much love from Sacramento!
My day job is actually the phone company. Well these days it isn't so much phones, it is internet, TV and fiber optics. I do have an engineering background though.
Such warm sound with this Amplifier
Not even close to a tube amp.
Great video! Gave me quite some pointers for trouble shooting amps.
This was a very good video. Very academic.
So impressed with selection of Python :)
Love your Work how you trouble shoot issues fantastic work🤠
don´t get mad at the thumbs downs, they help your views just as much as an up one
I only watch your videos in 480p. Internet is slow in my country.
More videos please. Great stuff.
You should use a better solder with flux like kester 44.
Next great movie and now i know how to check bad transistors :)
Heating and cooling finds the fault in noisy transistors in many cases.
This is a common way that transistors fail. Heat and cooling is a fast way to pin point. I use just good old duster and invert the can so the propellant sprays out. Cools to -70'C
Assholes give thumbs down due to spite because they know they can't do what you do its jealousy my friend if negativity didn't exist then we as people wouldn't exist misery love company but me I love watching what you do its talent
42 thumbs down. I wouldn't worry about it if I were you. All successful RUclips's get their share of them. Love the Python plug.
so does thumbs down have a negative effect or is it just an ego thing. i think your vids are great but i guess there are all kinds out there
They show up in stats. The view is still counted. It's more of an ego thing for people with nothing better to do. We call them wankers.
Gotta love fixing amps
Maybe because you have placed the pcboard above the panel..this may scratch panel...maybe this could bother people
Carlos Mergulhão
No I didn't scratch anything.
Hola! Soy andres de Argentina, como puedo porme en contacto con 12voltvids, tengo un problema con un amplificador yamaha y necesito ayuda..Mi correo electrónico es musicologi@hotmail.com.
12voltvids Hola, como podria ponerme en contacto con usted? mi correo electrónico es musicologi@hotmail.com tengo un problema con un amplificador yamaha..
I think he did a good job so what he put recorded player in top to test it at least he took the time to record it all and share I
Is it OCD of me to wish you would wipe the dust off before reassembly?
I am not a janitor, and people are not paying me to wipe the dust off the inside. they are paying me to fix the problem, nothing more. A little dust inside isn't going to hurt it.
@@12voltvids l know, it's just me being a weirdo about dust. I have to wipe it off and give it a blow with air. You videos are fantastic, i've learned so much from them.
B.T.O. Yeah!
That phono pre-amp crackle could be used to get me to sleep every night, sounded like a lovely log fire.
Dave, ignore the thumbs down people. They are not even worth mentioning. Your work is awesome! You, sir, know your stuff, and I salute you for sharing it. Thank you.
They are looser's. Jealous loose's is all.
I agree - screw the trolls and haters - 12voltvids knows what he's talking about.
* much respect *
Wow this comment section is pretty negative with the trolls and idiots. Would love to see some of their perfect soldering and more important their diagnostic skills. Cool vid as usual, and don't worry about the thumbs down, in fact invite them to do it more, YT algorithms don't discriminate between thumb up or down, it's all interaction and helps your vids out! ;)
Old video but that is a good looking preamp. Also, I like the build quality and repairability.
Thumbs down on the abysmal reflow of that relay? I won't give a thumbs down for that. Flux would have helped and a bit more heat. I've been soldering for decades almost daily. The sight of that did make me kind of want to loose my lunch.
I love old stuffs!!!!
specially in audio, great sound quality!!!
I really live old amplifiers. The sound quality is Pure and Perfect. I wish I could still fine some of those in Philippines.
Always learning from your videos and always amazed at the work you do. I realize you have years of experience but still, wow. Thanks for the video. Working up the nerv to work on my Pioneer SX-850. Got it for free from a neighbor in mint condition. Controls are scratchy and some caps are bulging but watching you vids are giving me confidence
Thank you! This amp is my favorite in my collection. The sound it produces is unbelievably good to my ears. I use it for my turn table. I have the power / right channel low sound issue with a bit if crackling and i bet you it has to do with a dirty relay as shown here. I have always powered it on and off 2 or 3 times until i get clean sound, listened to my album and have always wondered why it did this. Now i can open this thing up in confidence. Thank you for taking the time to put these videos together.
solder connections aren't too good best to desolder and clean with flux before re soldering
it is necessary or it will fail again that joint a 6.20 wasn't wetting and more solder was being applied than was necessary and if you are going to take the relay apart at least de solder it from the board
thehappylittlefox is absolutely correct about the soldering this guy does. I have never seen him use liquid, or gel, flux when he reflows connections. This results in excessive heat. Could result in lifted pads and runs, also dead solder. Dead solder will result in cold solder joints. It must be removed, prior to reflowing connections. Use solder wick, solder sucker, or a soldering station with a vacuum pump. The soldering methods he uses may cause more faults to occur. They may not manifest immediately. Excessive heat will cause damage to the board and result in damage to components that may cause them to fail prematurely. There are several good basic soldering technique videos on RUclips. I suggest anyone that intends to do repair work for paying clients learn acceptable, high quality, soldering techniques. Not doing so will result in returned repair jobs, or loss of business. Reputation is everything to a repair shop. No disrespect intended toward this gentleman's troubleshooting ability! I appreciate his videos too. My credentials: US Navy Advanced Electronics Technician, certified to NASA standards for Micro-miniature repairs (2M).
@@Myname549 I like to clean soldering iron tip after every two reflow joints to keep from having too much solder gobs . This if not using solder wick to completely clean the joint.
We all have our way of doing things! I use a single shot desolderer and reflow a joint!.......not a spliff???. My biggest gripe is seeing anyone not using needle nose pliers to shunt heat away from transistors as they solder them in! I also think it's about time we got back to point to point wiring when manufacturing anything, especially valve amps or tubes as you disgusting yanks call 'em! Really?? Printed circuit boards are ok for low power low heat use! Toob sockets should be mounted on the chassis not the PCB! Why do a lot of audio companies do this? Cheers from OZ Andy! XXXXXXX
@@Myname549 I agree, I would have removed the old soldier, cleaned the connection and appalled new soldier to the pins. anytime there are pins like that on a relay, transformer etc. that's what I usually did.
A big thumbs up sir, I am waiting for my Yamaha CA-1000 III.
Hopefully not many problems or caps to be replaced.
As luck would have it, my 1990s Technics amp has a very similar problem with the R channel (it's usually fine, but at most annoying times can all of a sudden start crackling and go off entirely, and usually i get it back on by switching the input selector knob a few times - there's no doubt the knobs have dirty/oxidized contacts, too), and i've been waiting for a time when i'd have a clue on what to do about it. Never opened up an amp before but this seems like a good time to start.
If anyone reading this comment has any other ideas on what else might be wrong with it and if its self-serviceable, please let me know :) Even a long time from now, since might be i won't be able to fix it (likely if it requires anything else than shown in this video.)
Wow thank you very much. This is the best video for repairing amp. I always wonder how they do it but now i am confident i can do it also. This channel will always be my reference and you are the best teacher in the world.
Hi. Thanks for the great videos! I'm an avid viewer. I have this exact amp. I rescued it straight out of the trash. Could you offer some assistance as I have a Yamaha M-60 power amplifier and I trying to connect it to the CA-600 and use that as a pre-amp but when connected it just doesn't seem to transfer the power. Is this because the input voltage is different between them. The CA-600 is 0.775 volts and the M-60 is 1.24 volts? Thanks for any assistance you can offer.
My Yamaha natural sound RX570 is horrible for attracting dust ... the power switch, the controls, the natural sound button, need to be cleaned every couple months ... where as I have a optimus AV system in same room ... never had a problem with dust migration ...never had the cover off of it... can't say that for the high dollar yamaha.....
After watching this video, it's a great argument for bringing back point to point wiring. Primaluna tube amps are point to point with some small pcbs for holding an LED in place. They're total garbage in a beautiful amp like this. PCBs are no ones friend.
Why would anybody's thumbs down this guy I find his presentations to be extremely helpful highly informative and easy to understand.
Great stuff. I forgot about using head and cold spray to troubleshoot intermitent problems like this. Cheers :)
Thank you very much for the tips. I fixed my Sony SRT-SE501, I found a lot of cracked soldering, the relays were clicking randomly and left channel had crappy sound, now it's OK.
I subbed because I like your long and detailed videos...great work
Hi.. i got a similar one at home... the CA-800... same kind of cleanup to do... but i also got a Photo input problem : no sound from turntable in the Photo1 or Photo2 input... Do you think the problem could be from my Turntable output ??? i aint got a second amp to test the turntable...
43 people are Yamaha nuthuggers but can't deal with reality. Do you sell the refurbs on FB or Ebay Dave ?
I don't use FB or eBay.
I always upvote your vids before i watch them because they are always good!
C502 (2200uF Electrolytic Capacitor) on the ACC Line at the Input Jack is Bulged on top but not Leaking...measures Infinity. C315 (470uF Electrolytic Capacitor) on the BATT B+ Circuit is also Bulged on top but not Leaking...the bottom is blown out on this one. Both are in Parallel with + & - and are not Shorted . All Solder Joints & Traces look fine as do all Components & Board. The Unit doesn't light up at all.
Nice repair. Yeah, good old JB-Weld has gotten me out of a bind many times too.
And as far as the turntables, yes hang on to those legacy turntables. I still have my DUAL and Technics from the mid to late 70's. 👍
Can't beat an old turntable. The new ones don't compare.
P
Even being in my sixties I'm still picking up stuff
from your videos.really enjoy them, thank you.
Thats called tricks of the trade, and I am sure those that are still attempting to make a living doing this are not to pleased.
I think it dreadful nobody even gave you a single thumbs up as it was a great video well done man, at least you did not do as bad as me, I gave a Romanian lady in the space of 8 months €46,000 and believed everything she told me but it was my own fault, I am trying to repair electronic stereos TV's and hi-fi systems to make some of the money back, I don't know why more do not at least say something about all of your hard work I think it unfair.
I have plenty of thumbs up on this. Over 1000 thumbs up vs down I just didn't have them shown.
INCREDIBLLE!!! My comment was moved down in the list....how can you do that? :)) Or RUclips did it?
I can't
How many watts is the Yamaha thinking of getting a ca 810 cheers
Nice work, Dave! Don't change a thing with your videos. I must say, you had to pull a few tricks out of your bag with this one! : ) Thanks for sharing
Great repair job. I wouldn't worry about the thumbs down. The ones who do are just trying to impress other techs and to make them selves feel better at the end of the day. I been a service tech for over 36 + years and there is one thing I noticed. A true tech will praise another tech on job well done. Your videos are great!
Thanks. Yes I have been a qualified AV tech for at least 36 years too. Started studying electronics when I was knee high to a grass hopper.
Built my first Heathkit, in 1976 that was the GC1005 clock. Then built a full stereo receiver (still have that, will be servicing it one of these days) when I got out of high school, I studied electronics with a private instructor, at the first shop I worked at. He had been an electronics engineer in the military, and built RADAR, and radio installations during the war. He knew his stuff, and drilled me with theory. After 4 years of Special High Intensity Training (SHIT) I wrote the challenge exam, and passed with flying colors. Same exam that were used in the technical schools of the day. Covered tube and solid state theory, transmitter and radio design ect. I got a job with the Sony Canada, and worked for a year in their service dept, where I learned Betamax, which was invaluable as VCRs were just coming into the market. Sony wanted to transfer me back east to head office, and I didn't want to re-locate, so I left, and ended up at a large independent authorized service center where I did warranty work for Sony, Panasonic, RCA, Toshiba, JVC, Samsung and LG.
Left the industry in 2003 to change to a different line of work, but I just can't leave my past behind. People in the community know me, and I get constant things to repair. It has slowed in the past few years, and I am quite pickey on what I will work on. If has more than 2 channels for example I am likely to pass. Big high power 2 channel amps, and tube amps are my favorite.
Very impressive career. That is one thing I wished I would of had. A private Instructor.
Envy is the reason of thumbs down
Right :)
It is a problem that there is no other solution instead of using relais on that point ....
From your Experience... why would the ACC Circuit measure Infinity from the ACC Pin to Chassis Ground? Sony CDX 4090? Batt Circuit is in the 1 Meg Ohm range.
Id suggest to replace a new relay than modifying it because customer gonna pay for it, not like it costs a lot anyway
Actually it does. By the time one gets here with postage and broker fees it is about 65.00. Yup 65.00 for a 5.00 relay. And no the customer doesnt want to pay for it because it was an amp that he was flogging to some sucker on ebay. So he doesnt care if it breaks in 6 months or a year because he won't be using it.
Negative people's whole life is a thumbs down. 👎
Hey i have a sony cx333es cd player that has bad rca contacts can this be fixed? A par of rca fixed out dont work as all the others cut in and out if wiggled
Resolder them to the board.
And NOTHING about BIAS, IDLE ... measuring, adjustments....???
Because I wasn't being paid to do that. I was 20.00 to repair the relay. The owner wouldn't even spring for a new part. VERY few and I mean VERY few want anything more than the bare minimum done.
I never get people showing up saying check everything and bill me whatever. Evenrone is just concerned with getting something running so they can sell it to someone else.
Putting a couple hundred dollars into a total rebuild does not guarantee that they are going to make their money back. My customers buy stuff at estate sales, and from facebook market, and get it fixed as cheap as possible so they can sell it and try to make a profit.
I always give you a thumbs up! I've watched over 100-150 videos of yours, I might be wrong, but maybe you talking about "people giving you a thumbs down", WILL make you end up with more thumbs down than if you would have not said anything about it!
Your the man wish i knew what you know.thanks for the videos
Don't sweat the thumbs down. Look at at all the positives.
your voice reminds me of bob seger sometimes....lol
Sounds good, that receiver probably would sound great on big speakers. Watched your TDK was that the brand on your stereo drift. I did an alignment on a Denon , very similar problem, they have a stereo /muting switch. Note: I found that if you are super close to a transmitter you can get wash over or image issues with FM stereo. I am a mile outside Chicago, some times if I go up on actual signal, & this is a Digital readout my stereo /signal light will both fire. It looks very similar to your TDK.I am going to walk up a flight & get model & I'm back. { Model is a Denon -precision audio component / tuner amp DRA -300 it has a stereo muting switch for FM. I did an alignment with DMM , it sounds really good massive heatsink. Finished metal cover in black crackle spray paint. Take care ,Hugh Mc. Chicago , metro
PS : The 2SC1345 is a low signal NPN amplifier transistor with a collector to emitter voltage of 50V and collector current of 100mA. Good repair on the Yamaha, yes thumbs up !!!.
I tell you what does sound great. My crest audio 900 watt amp.
@@12voltvids my buddy that does audio in Mantooba has six or seven crest amps in a rack for live/stage stuff. Great amps. He gets lots of, "If you ever want to sell those . . ." comments.
@@velixzeen i have a crest vs900. It has balls allright.
I can actually hear the feditly change as you cleaned it my equipment used optical out from tv to sony str DA4es on 2 infinity sm155 studio monitors nice job 👍
Your patience with some of these modern "throw away" electronics is admirable. and yeah, the hell with the Thumbs down. Obviously jealous. even with the more difficult repairs. simple common problems are (purposely?) so inaccessible, it's barely worth it but for the challenge. Keep up the great work and videos. I enjoy them immensely!! and yeah, i'm jealous... but in a good way.
I won't be giving a thumbs down--it is one's' prerogative to do so however. This is a free country and suggesting anything else is un-American....
I am perplexed by one thing. Apparently the CA600 unit is used in a metal shop or high carbon dust environment. Did you brush off the boards a bit before assembly to alleviate the collected dust? Wouldn't common sense dictate the thought that carbon dust conducts electricity?
Your comment about no sparks reminded me of an old poem that turned me off working with 240 volts forever! "Pair of pliers, electric wires, blue flashes, now ashes". Slow but fascinating video.
Hi Mr. 12volts would please tell me the name of the band of the audio you use in this video, it is on 18:43. Thank you.
Hi, been watching a lot of your videos and I admire your work, im in Brisbane Australia and have a loudspeaker repair business, I need your help with info if possible, I have 2 amplifiers, both Luxman, one a L100 and the other a M2000, both have intermittent problems, one channel has random crackling, its hard to pinpoint as it comes and goes, the L100 has had the channel completely rebuilt, I mean every component...and still has issues, the M2000 has had all capacitors replaced and driver transistors on the main pcb...no change...im at a loss...
Very nice fix, subscribing. I have the same amp and switching it on does nothing. After checking fuses, any advice what to look to first? second? I have the overall schematic, block diagram and internal view copied. Thanks Dave for the teach.
Hi. In what city are you located? I would like to bring you some components to fix if you would take them. Shipping back and forth he's too expensive, so a nearby tech is the only affordable way to fix stuff for me. Thank you
I'm in Vancouver Canada.
@@12voltvids Thank you. I'm on the pacific coast as well, only a few thousand kilometers south, in San Diego!
Keep coming the good stuff.
Lovely
Great job, just came across your channel im fixing a similar one for a client with many issues but these are good receivers. Also great channel just subbed!
I love your videos: it's like watching a "documentary" on TV😃
I have to find a new stereo because mine had a lose bracket inside it that got on power supply bord and was laying on they rectifier ICs. the bracket got hot enough to melt all six pins on the rectifier ICs and the fell out of the board. after rectifier ICs fell out it allowed AC to go throw stereo killed ever thing in my channel master stereo.
hi there! Great vid , I'm a beginner, still on classes and If you allow me to make a question..
I'm fixing a technics SA DX940. It does power on as soon I plug the AC but the front panel can't turn it on. Fan runs for a bit while and stops. Maybe a protection mode...I also identified that the power transformer is outputting about 20% more voltage it should and It algo has a buzz sound. Is it acceptable? Would this power transformer failing?
Really thanks for your time! :)
+curiosidicas - It would be a VERY unusual failure for a power transformer to output more than it's stated voltage. Conceivably some shorted turns in the primary winding could cause it but the shorted turns would also cause overheating/odor/smoke. More likely, if your readings are correct and it actually is putting out excessive voltage, the cause is probably an incorrectly set voltage selector. Some appliances, particularly those intended for international use are equipped with some means to match the device to the line voltage of the location it is going to be used at. Typically the selections will range from 100v to 240v. If the selector is set for a voltage that is less than the input line voltage the transformer *will* output more than it's intended voltage. If the difference is not too great the unit will probably still work but the power supply and other areas will run hotter than they should, which will eventually cause something to fail. So unless your transformer is overheating, look for a misadjusted voltage selector.
"Thumbs down Losers" Those who opens things to fix something but can't even put back together.
If I am happy watching this I am sure the owner will be too :), good job! Btw I think the dislikes are coming from some kind of bots crawling RUclips for victims.
Thumbs up. You worked through it in a very methodical way a its fixed!
Regarding your reflowing solder ; technique I learned in the military is a final sweep up the leg of the component to pull the solder into a “Hershey s kiss” finish ; less chance of solder bridges . Thoroughly enjoy your videos
!!! JB Weld !!! You're my hero! I love that stuff.
Great work! Total novice here, learning by watching and listening! Please keep up your good work!
Yamaha audio and motorcycles. Honda never made audio devices, did they?
That relay reminds me of the voltage regulator in old cars. (Although the ones in cars was much much larger)
I guessed it was a transistor.
Honda made cars.
Yamaha also makes musical instruments.
Love the old Yamaha amplifiers. This definitely looks like a higher end model. Would really love to get one of the new high end A-S1100 amplifiers with the classic style needle VU meters. Excellent sounding amplifiers from what I hear. Great video! 🙂
You have a Schematic for a Sony CDX 4090 AM/FM Receiver I could Borrow?
I don't have any. I get what I need usually from HiFi engine.
Nice , I’ve used a pencil eraser on contacts but I like that bottle of solution.
it is safe to use contact cleaner to clean potentiometer? and what if i accidenty sprayed it to nearby transistors will it cause a problem?
Cleaner won't hurt a transistor. Do not spray it on the tuning capacitor of a radio or tuner.
@@12voltvids thank you..subscribed.
Curious that phono pre-amp noise. In the last week I've seen that same noise (in person or on YT vids) here, on one of Dr Cassette's videos and a modern 'Sansui' branded integrated amp I bought off eBay. And three different diagnoses -- transistor fault here, b0rked selector switch (DC) and a badly-soldered op-amp on my own unit. All with more or less the same symptom.
Yes a dirty switch can cause it. So can a bad connection. I looked at that first.
I cut the part where I re soldered the preamp board because it didn't cure the problem, and the video was already long enough.
If you see my watch in the shots you will see how much time was put into this unit, which was about 4 hours.
Absolutely brilliant It has been many years since I have seen such attention to detail within your Component level diagnostics... It was almost serene observing your methodology. Many thanks!
Great video! I have a question though: I have the CA800 but can't get rid of the hum and buzz problems. Do you think that this is a "standard" issue? Is there a way to bypass it? Thanks!
Humm and buzz are Never standard issues....
It is not class B apmlifier nbut a class A/B! Claas B amp does not give good audio do to high distortion.Yamaha makes good amplifiers
Actually it is a class B amplifier. All push pull amplifiers are class B design.
It is biased as a class AB amplifier, which means that the 2 output stages are biased into slight conduction so that neither transistor goes into cut off, as it is the hard cutoff that causes that nasty cross over distortion.
You take a standard class B design, and add a resistor in each of the output states to prevent cut off. Same with tube amps.
Guitar players would often modify their tube amps so they could go "dirty" which was done a few different ways. One way was to over drive the crap, and the other way to under bias the output.
Thank you - this led me to solve the channel dropping issue in my amp. I popped the cover off and mine wasn't broken like this one - but I cleaned the points with electronics alcohol and a small piece of paper soaked in the same liquid.