I had to be about 4 years old when my dad bought this Yamaha RX-V870 receiver (if it was bought in 1992), as time went on he bought other receivers and put this one in another room. Then when I grew up and got my own house, I was looking around his house and asked if I could have this Yamaha RX-V870 Receiver and he said yes, but when I went to power it on it was dead in the water, No power to the unit what-so-ever. I took it home anyway, but could not get it to work, so it went on the Bulk-Pick-Up pile in the garage, ready to be thrown away later. When the time came to put the Bulk-Pick-Up trash outside, I couldn't part with this great looking receiver and so for the last time . . . I plugged it into an outlet in the garage and it powered ON - It was an audiophile miracle - and you could imagine my excitement ;) That was like 5 years ago and it's still rocking on today - I have it hooked up to my flat screen tv with surround sound speakers and everything works great, even the remote. I remember looking at the remote as a child and thinking how complicated it looked with all the buttons and my dad saying: "Don't touch the remote!" :)
I ended up with my vintage receiver the same way. My dad bought it and then didn't use it and it ended up in the crawl space for me to find years later. Mine a little more prestigious however, it is a Macintosh 1600. No I have never shown it on the channel. Some day I will overhaul it.
This was a really good 5.1 Yamaha receiver. It was the 3rd best Yamaha Receiver in 1993. The model above it was the Yamaha RX-V1070. The top of the line Yamaha receiver in 1993 was the Yamaha RX-V2090. It was really built. This is when pro logic was popular for 5 channel receivers
Yes I recently purchased a 1070 off of eBay in what turns out to be mint condition. Before and since I've studied the the reviews and comments of people who have actually owned and used the product. I know the one I bought was supposedly one of the last receivers versus AV receiver designation made by Yamaha while they were still manufacturing in Japan at that time. The reason I say receiver versus AV receiver is because of the great emphasis on the front two channels and the labeling on the front of the model. When I went to check mine indeed it said Yamaha natural sound receiver not not Yamaha natural sounds AV receiver. These mothers boasted 0.015% total harmonic distortion and mine features two decibels of dynamic headroom which is a lot for a receiver. It is 110 watts per channel pushing 8 ohms and 135 watts per channel pushing 6 ohms with dynamic power ratings of of 160 and 190 respectively. I know the top of the line Yamaha Adventege AV models do no better than 0.6% total harmonic distortion. I've read that the manufacturers had become so focused on features and marketability that the engineers or left with insufficient resources to put into the actual performance of the amplifier.
I found this to be an excellent TH-cam instructional video. I have an RX-A820 which although old isn't old enough to have a removable bottom panel I had pretty much zeroed in on a bad speaker relay switch. This video showed me how it could be repaired. I used to trouble shoot circuit boards but don't have the stamina or the eyesight for it anymore. I would have needed schematics to take this on, but this guy seems to know where everything is already. Although I won't be attempting to repair my Yami, found the video very informative and really it only confirms my own conclusion about what just started AILING my 7 year old A820 which is absolutely Maxed out--every input and has never given me any problems till now. I'm going to buy a replacement unit on Ebay and hope these relay problems aren't just inevitable for all these Yamaha.
Thanks for the vid. I just googled this because my Yamaha rx v870 started buzzing. my left channel was always slightly weaker at low volume, but when the unit all the sudden started buzzing today, left channel cut out completely. i tapped the bass extension and tone bypass buttons a couple of times and it came back. now the buzzing also seems to have stopped so i guess its intermittent for now. time to have mine looked at. i use this regularly over my Marantz 7.2 which sits on a shelf. the Yamaha sounds great with my Klipsch.
Nice ! Just got inspirated to take a look at my good old trusty Denon AVR-950RD. Before it could take selveral power on attempts (exercising the relays) to get a prober sound. Cleaned the relay and hopefully this can gain many more years ;) Also a big thanks for the many repair videos, I really learned a lot watching these.
I've loved every Yamaha surround receiver I've ever owned. Both were free and required very simple repairs. I cheated once and got an Onkyo and learned my lesson. NEVER AGAIN.
1993 model. I bought one for $20 - the owner said one channel was dead. Turns out it was corrosion/crust across the output transistors' solder pads on the board, shorting them out. Cleaned them and it worked perfect. Sold it for $160.
Audioquest56 There will be a new video for this unit soon, as the owner just contacted me to say that"1 channel has gone dead" and he will be bring it back to get serviced again in a few weeks.
Thank you so much for the amazing video. I was able to find the relay problem on rx-v870. I do moderate repair work but this was so intermittent that without this I would have not ever figured it out. Mine would go hours or days without a issue. Liked subscribed and thanks a million
Thanks so much for the video upload! I am working on a Yamaha from the late 1990's and not only does the circuit board layout and output transistors look identical, but the relay circuit which i suspected, looks exactly identical. And guess what the symptom is
An excellent video. I really like the detail you showed on how to service/clean the relay contacts. I've got an old mid 70's Sherwood amp that would lose a channel occasionally. I don't think it has a relay like the Yamaha does, but maybe I can find a cold solder connection. Sherwood's service department kept it long enough, but never completely solved the problem. Regards, Tom
I can't DIY and I recently bought a beautiful 110 watt version of that unit RX v1070. It have been bench tested before I bought it and was playing fall asleep The more recently it started losing volume and sound quality and I figured maybe it needed to be recapped so I talked to a service person and I just happened to notice when I was boxing it up that the transformer and what I believe he called the standby transformer have this copper colored solidified liquid coming out of them which I know has got to be bad news. My unit actually looks like it may have been recapped, perhaps before it was bench tested. I feel absolutely sick as I would imagine it cost a lot to repair a transformer in the possible damage could have occurred downline as well. But excellent video in terms of helping me understand to work up of one of these units.
@@12voltvids so it sounds like you're saying that there may not be a problem with the transformer. I know I have not experienced any difficulty with it powering on... I guess that idea in my head because it does sound like the audio quality has diminished and I've noticed that I have to turn the volumes knob up from 9 o clock to roughly 10 o clock to get the same volume using the same source and maintaining all other variables. Over all the unit arrived in immaculate cosmetic condition and sounded as good as one could hope for a receiver to sound following my purchase back in April. I think I got the idea of leaking some kind of substance from my discussion on the phone with the technician I've been talking to with regards to service and restoration with regards to replacing capacitators. I'd shared with him that my 1987 adcom power amp which I played in the same configuration with the RX v1070 had been experiencing a gradual decline in fidelity and power for over a month and that I've received it as a gift from my brotherhood only used it for about 2 years after purchasing it new in 1987. The topic of capacitator seems to be a big determinant with regards to fidelity and power. From what I've read it would appeary understanding is that age and heat cause them to degrade. My brother also revealed that he had stored the adcom during all those years of non-use in a outbuilding which while dry was subject to getting very hot in the warmer weather. Neither of us have any idea whether or not that can age or degree to pass theaters in a manner similar to the temperatures they experience over thousands of hours of use. The fact that both amplifiers started demonstrating similar problems at around the same time maybe telling in itself. I hope it is not something that I have done in my setup that has damaged them. My living situation limits me to well below the optimum 80 decimal range a lot of people like to listen to their music yet so I haven't overdriven them. My understanding of how capacitators alter and store power and my reading of descriptions of what type symptoms accompany their need to be replaced are the only clues I have as to what needs to be done. But I greatly appreciate your communication as I really love both these components and particularly with the Yamaha was on the verge of just abandoning it and purchasing something else. And I still face the dilemma of the cost of even routine refurbishment of both units and a wait time of a couple months without music. I wish I had had more time to possibly learn how to do some of this myself. I feel much more encouraged knowing that most likely the problem is not with the transformer although I guess it will take a diagnosis. So I really appreciate your feedback as it was my hope to keep both of these units in good working condition and use them indefinitely. When both amplifiers were at their best I had managed to assemble a Hi-Fi system with as much fidelity and power anybody could ever want at least with my budget. So once again thanks and I will be following you on TH-cam.
I'm sorry that response was all messed up I'm tired and was trying to proof it. Anyway I do greatly appreciate the information because I hope to keep my system together and at least it sounds like this might be more of a possibility. I did download a GFA 535 service manual but have nowhere near the understanding or the skills or the equipment to embark on such a project on either of these. Perhaps after watching a lot more episodes of your TH-cam presentation and more study I'll be more capable of doing this. Thanks once again
As you can tell I'm real to you to computers too do not complete that last comment regarding me programming 870 and my my 1070 in my power amplifier. It was brought to my attention that it was very unlikely that that was liquid coming out of my transformers but rather some type of adhesive technicians use when they're working inside of these units. I also went back and crossed checks the appearance of my units 2 large capacitators, I believe they're called the power capacitators. I noticed that they had been replaced. This made sense since just prior to my purchasing this model it had been bench tested by a technician with 30 years of experience. To make a long story short and I feel really foolish... I use both the power amplifier and the Yamaha RX-V1070 simultaneously to provide a surround sound type configuration hi-fi listening experience. My front speakers have four terminals for bi amplification or bi wiring. And I had experimented around with using either the 1070 or the power amp in a bi wire configuration. The whole problem turned out to be easily solvable and had nothing to do with either amplifiers performance. Encouraged by the information acquired by this program I had unboxed my Yamaha and my adcom just to double-check to see if the problem might be with the speakers. I was so focused on the concept of age and the need for renewal or new capacitators on vintage stuff that I neglected to look for something more simple. As you may have already guessed I had forgotten or missed my replacement of one of the shortings on one of my front ( left )speakers pair of terminals which is necessary when you are only using a basic single terminal input. The shorting was over one but then off to the side and just barely touching the bottom rightportion of the tournament was supposed to be connected over. Since these are mud best speakers anytime I get a lesson satisfactory audio performance from something having to do with the system whether it be the Yamaha or the adcom I would hook the suspected unit up to them. But apparently this was a systemic problem too as the rear speakers a demonstrate substantial loss of fidelity and power. I'm not sure how the front amplifier connected to a configuration involving a split source was able to backtrack up through my digital to analog converter and into the RCA y connectors and go back into the other amplifier impacting it sound performance. But that indeed was the case and as it turned out after correcting that shorting problem both amplifiers / preamp or receiver along with all four speakers are back to their original fidelity and power. I had boxed both the 1070 and the 535 up in the original boxes and had planned on taking them on about a hour drive to a technician I had talked to to have them diagnosed. Something he was going to charge $80 each for and then apply it to whatever repairs he would have recommended. And he was 2 to 3 months behind so I would have been without music for all that time and out hundreds of dollars. I take great pride in my wiring and my connections and I'm baffled as to how I could have made such a stupid mistake except that it is dark in that corner of the room behind the speaker and I usually have to use a flashlight to see clearly. Lessons learned. Never assume or make rush judgments based on insufficient information. And since that incident I have downloaded a service manual for the GFA 535. It is my hope that by the time it actually does need new capacitators or any other type of work I can learn enough and watch enough of these programs, and acquired the necessary tools to do this myself perhaps with a little coaching. I had a RXV 2500 which must have shorted out and would no longer power on after generating white smoke consistent with some type of combustion. Being really new to all this that point I just took the loss and wrote that one off. I disassembled it out of curiosity and it indeed had had some kind of issue with the power transformer is the copper band around the outside it melted in the back. Had to know more into could have probably been repaired. I saved very circuit boards including the ones on which the two main or largest capacitators on that model. I also have an amplifier board off of a b i c subwoofer therefore would have two things to practice my soldering skills on. I'm not sure how I would test for current but since the subwoofer amplifier board is intact I imagine there's a way to supply it with enough power to check the transistors and the capacitators. The reason I have it is because it was on my original subwoofer and sent out for repairs and came back with the original symptoms. It's inside it just purchased the subwoofer and BIC has excellent product support and warranty coverage at that point they mailed me a brand new amplifier for the subwoofer. Although I know very little about an electronics with regards to the technical inner workings I save this type of stuff because it fascinates me and I always think I might have a use for it in the future. Well now I have a use for the stuff I saved. When I got into vintage I had looked at a couple articles where people purchased vintage equipment in order to get high quality sound on a budget. And then they described how they were disappointed with the sounds but were then motivated to go out and do their first do-it-yourself recap job or whatever which let them to have the confidence to go on and do numerous repairs on their own equipment. But since that time I have learned that it is simply not that simple if you don't have a technical background. But I also have the motivation of wanting to have access to the best sounding equipment possible within my financial
I think I'm going to lay off the public comments for a while. I start rambling and then I end up sending an unedited response before I have a chance to edit it so it's rather embarrassing. And I don't currently have access to a laptop or a desktop so it is weather hard to compose one this small screen smartphone
I'm more awake today so hopefully I can offer my appreciation to this program for helping me not disregard my Yamaha RX v 1070 which is the big brother of the one on this video. I did something really stupid followed by making me uneducated observation about the appearance of my transformers with regards to thinking of damaged and causing the Lost to the audio quality in power associated with this receiver. I also thought that I additional problems in that my adcom GFA 535 power amp and finally reached a level of usage based on its age to where it needed to be recapped. Then I noticed a comment made during the program about the likelihood of two separate things occurring at the same time such as this. 535 will at some point need new capacitators as it came out in 1987.however it was very likely used by my brother before
I used to work in a repair shop, some of recievers not so easy to work on, I don't know why they designed them so poorly. This one appears to be high quality & easy to take apart and fix.
Relay was the problem on my RX-396 stereo receiver. You don't hear any sound until you push volume up, then works normally until you switch it off and on again. Cleaning relays contacts inside solve the problem. Now i have to took apart the second, RX-V420 surround receiver with the same (but not so often) problem.
think cleaning those contacts on the right channel relay helped me out, no contact cleaner atm so have to do that later. thanx a ton! err i got rx-v890 but the boards inside look older than the blue ones u working on, mine are like brown/tan kinda and the relay was kinda tucked away under another small board (forgot to look which). also relay cover was kinda T shaped. had to use solder wick instead since i dont have desoldering iron...that was quite annoying lol but thanx again!. also got that samsung x-main kit otw as i was given a 43 in recently rofl...there was quite the burn spot behind the MOV (varistor) so i duno if it did its job or blown. took out and diagnosed xmain issue...blah i should prolly be posting this on the other vid...should have the parts monday so we'll see
+Donald Ellett I replaced failed components only.If I am doing an overhaul on a very old piece of gear, and the client has requested that I recap the unit, they I will change all the capacitors. Of course those clients know how much they are in for. Those ones are the audiophools as I call them. Have no problem dropping 400.00 to recap their amplifier.
ebaysnipa The people that would spend $400 (4 years ago) just to have all the capacitors replaced probably don’t try to fix their equipment so they aren’t watching these videos.
Nice. great explain. I have a problem with same amp get in to protection mode as soon as power on. By disconnecting the rear amp section same results. All the solder joints and relays looks good to me. can you please help me out? thank you
@@danedwards4406 When yamaha amps said "natural sound" they certainly were, their phono preamps built into them are incredible too, japanese speakers are a BIG NO NO but japanese amps are the best.
I have an RX-V595a receiver that I bought new. It's a 5.1 surround sound AV receiver. Works great and love the sound, but I'm having trouble with the volume control. I tried cleaning it from the outside with some deoxit, but it only helps a bit. I guess I'll have to take it apart as well to clean it properly. Any thoughts?
I have the same receiver. No display and no sound, however it does power up as i can hear the transformer energize, there's a light on the volume knob and input button. No sound from any input/on any speaker output. It also "clicks" like a soft turn on after a few seconds of powering it up
Thank you for sharing this video. I bought one of these units new in 1993. It moved to the basement storage after a few months of usage. It sat there for most of its life till I recently decided to hear it again. What a sound, I love it when it is working well. But I have an issue with the left channel. It starts scratchy when the amp is cold. In one occasion, there was no sound from the left channel for a few minutes. So I opened the cover the cleaned everything that I could reach, however; the problem persists. When the amp is cold, the left channel has a scratchy sound and it gets better as it warms up by plaing 2 or 3 songs. I am looking for any advice that I could use to solve the problem, thank you.
Very nice video and u are so smart can fig out the problem by ur own, I have a Yamaha RX-V2095 almost same as Yamaha DSP-A2, now having issues when I switched the unit on and I turn the Vol up to 10% no sound out but if I increase the vol more than 30% the sound come out from all speakers it happens randomly, one thing I've noticed about when sound restored I can hear the sound come out a bit weak start with and come back to normal peak after 2secs , is anything I can do about it? I love this AMP I wish I can keep it forever.
My rx-v870 is starting to cut out on the right side. I really hope it is nothing serious. I inherited this from my dad its got sentimental value to me.
Most likely the speaker relay or bad solder. Open it up and give the relay a slight tap while on and see if sound cuts out or comes back. Good change that's the problem. Yamaha used shitty relays.
A nail file is WAY over-doing it on relay contacts. Once that precious contact material is gone - it's gone. There's lots of more gentle ways, but replacement relays are 5.00 or less on eBay. Nothing beats new.
+Mark Zacharias OK so a relay on ebay is 5.00 , then to ship ship to canada they want 45.00 then the broader firm because the shipper sent it fed ex instead of post wants another 40.00. Been down that road. Ordered a 23.00 item that ended Costing over120.Also you are forgetting the fact that many of the parts that you buy off ebay are parts that salvagers have pulled out of scrap units. Just look at the fun I went through ordering a board from shopjimmy for my free plasma. Sure they made good and shipped me a replacement, but that took another 2 weeks to get, and I had it shipped to a receiving depot in the US to avoid shipping to Canada costs, which added the inconvenience of 2 trips across the boarder, and extra fees to receive it. That 15.00 board ended up costing me 55.00 plus my time.So in light of that, the file on the contacts fixed it, and the owner of the unit is happy.
I used to use a "relay burnishing tool". There are better ways. Relays I often buy NEW from China for less than 5.00 each (Omron 24V DPDT) with free freight in qty or 1.50 freight for two. You have to cut off two pins and they drop right in. Been doing this 40 years. You do nice work though.
+Mark Zacharias I too have been servicing electronics for many years. I first got my CET ticket back in 1983 when I was working for the Sony corporation. I retired from that line of work in 2003 as I could see the writing on the wall. These days it is just a hobby to help people get things going. Most of the stuff I repair here is mine, and is donated after it is done, so I am not making money from the repair, other than the advertising revenue from youtube. So I am not going to spend even 5.00 on a unit that I am giving away. If it breaks down 6 months later, so be it. I use recycled parts as often as I can. Only if it is a unit I intend to keep, like the 3 PlasmaTVs I did. Those are keepers, so I spent some money fixing those. The Bose system too, that was a paid job, so new parts went in it. The rest of the stuff people give to me to take to the recyclers. I fix what is repairable, and then either sell it off cheap, or in many cases give the unit away.
excellent video . i also have a rxv870 that when i plug the power cord on the ac outlet the stanby relay starts clicking and the unit does not turn on. any idea where to start from?
Interesting video. My V870 cuts out (shuts off) after turning on. I understand the protection circuit is engaging. I've solved the problem that caused it to trip, but can't get the circuit to reset. (Unplugged the unit, pressed and held ON button.) I hope the circuit doesn't need replacing, as I wouldn't know what to do. Any suggestion?
this is happend to me now, and thanks for this video, sometimes relay did not make a contact, same type too (DEC DH2TU) and this relay hard to find in my country. Bad news my Yamaha type case design did not allow to open from the bottom, so i have to totally tear down circuit to release those relay, is there any other way or special tool to open relay without dissasembly from circuit board?
Hello, need help!! it’s been more than 3 years last time I turned ON my RX-V, surprised that front right main channel isn’t working at all, no signal from the receiver (LFE) arriving to the sub, another issue that I noticed, when I touch the main couplers, the lower one “main-in, pre-out” at backside I hear a loud hum from the channel that isn’t even working which is front right, our local authorized dealer doesn’t help, they said due to its age, they doesn’t have its service manual, I’m sure they will get that online, so they didn’t do anything!!! Appreciate any recommendations!! RX-V 2095 (1999-2000) year. Thank you in advance!! Wondering if the problem is from that relay as what you mentioned is a common issue for that receiver in that era Edited
Hey, I know it's been 7 years, but I have one of these when I power it on, the screen is frozen and dim. There in no change at all on the screen ( but it IS on). And no sound comes through. Do you have any tips?
I have the exact receiver. I had to replace the display bulb, according to the sm the power to the display bulb is 14.5 volts 110ma. It burnt out the new bulb fairly quick. I checked the voltage myself and it's 14.5 volts ac? Is this normal for this? I had to add a rectifier and a resistor with a 12v bulb and now it's working fine. I just thought it would be dc volts. Thanks for your videos.
Hi 12voltvids. I have a Yamaha RX V659 that immediately goes into protection mode. The error code is dc prt 026 hi. There is no short found on the output transistors. Any suggestions? Thank you.
Hello guys. I have a yamaha rx-v771 av receiver and just recently there is no more sound coming out. Any idea whats the issue and how ro aolve it. Thanks. 🙏
I just picked up a RX-V850 in great cosmetic shape...but the input buttons don't work. It's stuck in tuner mode. Any thoughts on a possible fix for that? Also, is there a way to reset this unit? I've looked thru the owner and service manual but see nothing about a reset. Thought I'd try that first...if I could figure out how!
I'm having trouble with Sony str-d965 going into protection. upon checking I found two transistors shorted so I replaced them but still going into protection. Only getting .8 volt on protect circuit when it should be 5.2v. I can send schematic if needed and any and all help would be appreciated. ps I've learned a lot from your videos. thanks in advance
I Hope that you help me, I have a Yamaha vr x665 when turn on three seconds and goes off without speakers I disconected the three stk power amplifiers without succes, thank you very much
Hey 12voltvids, I have this model I bought new in 1994, it has started turning off/ shutting down after I crank it for several minutes. Running old Klipsch KG5.2 loudspeakers. What can I check or clean to repair, I love this thing, it rocks hard!!! Thanks...Tony in NC
Often tungsten bulbs are not designed to work for many hours. Could also be the voltage on them is a little high. i would try replacing them with a white LED with an appropriate dropping resistor.
@@DadYouNeverHad That's a little surprising. Did You look at the schematic? Where does the supply come from? Used to be incandescent supplies were often a 6.3 or 12 volt winding. The new LEDs can be lit quite brightly from a 5 volt supply even with a 10-20K dropping resistor. Maybe yours is operating from a 15 volt regulated supply that is no longer regulated? I Really i have no idea without looking at the schematic. Did You match the original lamp number?
Hi. I have a old pioneer stereo amplifier, which sounds terrible on the right side when volume is increased. could it be the transistors controlling that channel be bad, as a speaker that was not meant to be on there was powered on that channel. Thanks
Never use an abrasive in relay contacts! If anything, use a burnishing tool, or stiff paper to "polish" the points. Once you damage the plating on the points, they will not last and the problem will return sooner than later. Sure, it is "fixed" for now. A brand new Omron relay is inexpensive and will last for years.
Hi 12voltvids, i have RX-V567 without any sound on any inputs. I don't have indicators on display (L,R,C,SW...etc). I have last firmware. I reset receiver, no result. Do you have any ideas, what can try.
Bad dolby sound decoder cpu. Just search the model number + no sound for a fix. I also have a rx sytem and my fix was heating it up with a heat gun but its not a perm fix. There is a recall on that chip and on the documet provided by texas instruments with recalled chips are also direct replacements listed that dont have the same issue
They can be cleaned up and will last a long time. Replacing them is an expansive option. Ordering from companies like digikey or mouser will cost 50 or so dollars by the time it gets here. Customers have limits on what they will pay. I made 40 on this. If I told the customer it would be 90 to repair it he is saying forget it I don't want to spend the money. The majority of the units I fix for people are selling them on ebay so they don't want to spend much. Just get them running so they can sell.
They sure are. Not everyone has a need for, or wants 5.1, or 7.1 channels. To many people pro logic is just fine. It all works just as well today as it did when new.
12voltvids I've Been running mine in stereo which has sounded good.. but I might hookup the rears and a centre to see what effect it has. I thought pro logic had to have the extra information mixed into the stereo channels for it t work correctly. I wasn't sure if it was obsolete now or not. I'll try it. Thanks man.
@@switch96551 Pro logic works by subtraction and addition. The left and right channels are added to produce your center channel and subtracted to produce the rear. In a stereo mix there will always be information decoded due to phase differences between the left and right channels. There information is there.
Could be a few things. Could be a dirty volume control if it is a linear control.. Another thing is a problem in the biasing circuit and the output transistors are going into cutoff. This is most noticeable at lower listening levels. In a class B amplifier (push pull)one transistor (or tube) conducts for the positive swing of the waveform, and another for the negative half. At that point where they switch crossover distortion (IMD) is generated. To minimize this class B amplifiers are biased into what is known as class AB. A small bias current is introduced into the outputs to keep the transistors from going into complete cutoff at zero status. This greatly reduces crossover distortion.If one of the resistors that provides this bias goes open then the transistors go into cutoff, and distortion is introduces, and this is most noticeable at very low levels.
WestSideJooo 22 years is considered pretty old for electronics.I would have thought it was older than that as it has no S-Video or component switching, and s-video was around back then. Oh well, still a good piece.
Speaker relays are there to delay connecting the speakers until the amp has settled down, and there is no DC voltage on the output. It also cuts the speakers off as soon as the power is cut so the gradual discharge of the power supply caps will not cause a DC voltage to appear on the speaker terminals and potentially damage the speaker. Only a fool would bypass them.
+Donald Ellett No I work on modern stuff too. Old gear makes me more money though, because people with the classic gear don't want to part with it. Can't blame them. I won't be parting with my Sansui 9090, or McIntosh 1600 any time soon.
@@12voltvids Those Sansui Receivers in the late 7os and integrated amps were amazing. They were built and made with metal parts. My friend has the Sansui G9000 and that receiver is as good as it gets. The tuner is very impressive on the G9000
@@danlivni2097 Worth big bucks today. Recently a sansui 9090 sold for 1500 at the vintage audio store. Mine is in good bit not perfect condition. I should overhaul it some day as it needs service but I dont use it. In storage.
I had to be about 4 years old when my dad bought this Yamaha RX-V870 receiver (if it was bought in 1992), as time went on he bought other receivers and put this one in another room.
Then when I grew up and got my own house, I was looking around his house and asked if I could have this Yamaha RX-V870 Receiver and he said yes, but when I went to power it on it was dead in the water, No power to the unit what-so-ever.
I took it home anyway, but could not get it to work, so it went on the Bulk-Pick-Up pile in the garage, ready to be thrown away later.
When the time came to put the Bulk-Pick-Up trash outside, I couldn't part with this great looking receiver and so for the last time . . . I plugged it into an outlet in the garage and it powered ON - It was an audiophile miracle - and you could imagine my excitement ;)
That was like 5 years ago and it's still rocking on today - I have it hooked up to my flat screen tv with surround sound speakers and everything works great, even the remote.
I remember looking at the remote as a child and thinking how complicated it looked with all the buttons and my dad saying: "Don't touch the remote!" :)
I ended up with my vintage receiver the same way. My dad bought it and then didn't use it and it ended up in the crawl space for me to find years later. Mine a little more prestigious however, it is a Macintosh 1600. No I have never shown it on the channel. Some day I will overhaul it.
This was a really good 5.1 Yamaha receiver. It was the 3rd best Yamaha Receiver in 1993.
The model above it was the Yamaha
RX-V1070.
The top of the line Yamaha receiver in 1993 was the Yamaha RX-V2090. It was really built.
This is when pro logic was popular for 5 channel receivers
Yes I recently purchased a 1070 off of eBay in what turns out to be mint condition. Before and since I've studied the the reviews and comments of people who have actually owned and used the product. I know the one I bought was supposedly one of the last receivers versus AV receiver designation made by Yamaha while they were still manufacturing in Japan at that time. The reason I say receiver versus AV receiver is because of the great emphasis on the front two channels and the labeling on the front of the model. When I went to check mine indeed it said Yamaha natural sound receiver not not Yamaha natural sounds AV receiver. These mothers boasted 0.015% total harmonic distortion and mine features two decibels of dynamic headroom which is a lot for a receiver. It is 110 watts per channel pushing 8 ohms and 135 watts per channel pushing 6 ohms with dynamic power ratings of of 160 and 190 respectively. I know the top of the line Yamaha Adventege AV models do no better than 0.6% total harmonic distortion. I've read that the manufacturers had become so focused on features and marketability that the engineers or left with insufficient resources to put into the actual performance of the amplifier.
I found this to be an excellent TH-cam instructional video. I have an RX-A820 which although old isn't old enough to have a removable bottom panel I had pretty much zeroed in on a bad speaker relay switch. This video showed me how it could be repaired. I used to trouble shoot circuit boards but don't have the stamina or the eyesight for it anymore. I would have needed schematics to take this on, but this guy seems to know where everything is already.
Although I won't be attempting to repair my Yami, found the video very informative and really it only confirms my own conclusion about what just started AILING my 7 year old A820 which is absolutely Maxed out--every input and has never given me any problems till now. I'm going to buy a replacement unit on Ebay and hope these relay problems aren't just inevitable for all these Yamaha.
Thanks for the vid. I just googled this because my Yamaha rx v870 started buzzing. my left channel was always slightly weaker at low volume, but when the unit all the sudden started buzzing today, left channel cut out completely. i tapped the bass extension and tone bypass buttons a couple of times and it came back. now the buzzing also seems to have stopped so i guess its intermittent for now. time to have mine looked at. i use this regularly over my Marantz 7.2 which sits on a shelf. the Yamaha sounds great with my Klipsch.
Nice ! Just got inspirated to take a look at my good old trusty Denon AVR-950RD. Before it could take selveral power on attempts (exercising the relays) to get a prober sound. Cleaned the relay and hopefully this can gain many more years ;) Also a big thanks for the many repair videos, I really learned a lot watching these.
I have been using this receiver as a preamplifier,Flawless! 👍👍
I've loved every Yamaha surround receiver I've ever owned. Both were free and required very simple repairs. I cheated once and got an Onkyo and learned my lesson. NEVER AGAIN.
Yup Onkyo blows, and by that I mean they suck.
1993 model. I bought one for $20 - the owner said one channel was dead. Turns out it was corrosion/crust across the output transistors' solder pads on the board, shorting them out. Cleaned them and it worked perfect. Sold it for $160.
Audioquest56 There will be a new video for this unit soon, as the owner just contacted me to say that"1 channel has gone dead" and he will be bring it back to get serviced again in a few weeks.
You just saved my receiver from the landfill... and probably my marriage if I bought any more audio equipment. Thank you.
LOL I know that last one, about buying more audio gear all too well!
wonderful diagnostics and fault rectification.
Mak.
Thank you so much for the amazing video. I was able to find the relay problem on rx-v870. I do moderate repair work but this was so intermittent that without this I would have not ever figured it out. Mine would go hours or days without a issue. Liked subscribed and thanks a million
That a nice amp and in good condition for its age.
Thanks so much for the video upload! I am working on a Yamaha from the late 1990's and not only does the circuit board layout and output transistors look identical, but the relay circuit which i suspected, looks exactly identical. And guess what the symptom is
An excellent video. I really like the detail you showed on how to service/clean the relay contacts. I've got an old mid 70's Sherwood amp that would lose a channel occasionally. I don't think it has a relay like the Yamaha does, but maybe I can find a cold solder connection. Sherwood's service department kept it long enough, but never completely solved the problem.
Regards, Tom
I can't DIY and I recently bought a beautiful 110 watt version of that unit RX v1070. It have been bench tested before I bought it and was playing fall asleep The more recently it started losing volume and sound quality and I figured maybe it needed to be recapped so I talked to a service person and I just happened to notice when I was boxing it up that the transformer and what I believe he called the standby transformer have this copper colored solidified liquid coming out of them which I know has got to be bad news. My unit actually looks like it may have been recapped, perhaps before it was bench tested. I feel absolutely sick as I would imagine it cost a lot to repair a transformer in the possible damage could have occurred downline as well. But excellent video in terms of helping me understand to work up of one of these units.
Well transformers don't have liquid in them for starters. Capacitors do. Sometimes they spray transformers with laquor to deaden vibrations.
@@12voltvids so it sounds like you're saying that there may not be a problem with the transformer. I know I have not experienced any difficulty with it powering on... I guess that idea in my head because it does sound like the audio quality has diminished and I've noticed that I have to turn the volumes knob up from 9 o clock to roughly 10 o clock to get the same volume using the same source and maintaining all other variables. Over all the unit arrived in immaculate cosmetic condition and sounded as good as one could hope for a receiver to sound following my purchase back in April.
I think I got the idea of leaking some kind of substance from my discussion on the phone with the technician I've been talking to with regards to service and restoration with regards to replacing capacitators. I'd shared with him that my 1987 adcom power amp which I played in the same configuration with the RX v1070 had been experiencing a gradual decline in fidelity and power for over a month and that I've received it as a gift from my brotherhood only used it for about 2 years after purchasing it new in 1987. The topic of capacitator seems to be a big determinant with regards to fidelity and power. From what I've read it would appeary understanding is that age and heat cause them to degrade. My brother also revealed that he had stored the adcom during all those years of non-use in a outbuilding which while dry was subject to getting very hot in the warmer weather. Neither of us have any idea whether or not that can age or degree to pass theaters in a manner similar to the temperatures they experience over thousands of hours of use. The fact that both amplifiers started demonstrating similar problems at around the same time maybe telling in itself. I hope it is not something that I have done in my setup that has damaged them. My living situation limits me to well below the optimum 80 decimal range a lot of people like to listen to their music yet so I haven't overdriven them.
My understanding of how capacitators alter and store power and my reading of descriptions of what type symptoms accompany their need to be replaced are the only clues I have as to what needs to be done. But I greatly appreciate your communication as I really love both these components and particularly with the Yamaha was on the verge of just abandoning it and purchasing something else. And I still face the dilemma of the cost of even routine refurbishment of both units and a wait time of a couple months without music. I wish I had had more time to possibly learn how to do some of this myself.
I feel much more encouraged knowing that most likely the problem is not with the transformer although I guess it will take a diagnosis. So I really appreciate your feedback as it was my hope to keep both of these units in good working condition and use them indefinitely. When both amplifiers were at their best I had managed to assemble a Hi-Fi system with as much fidelity and power anybody could ever want at least with my budget. So once again thanks and I will be following you on TH-cam.
I'm sorry that response was all messed up I'm tired and was trying to proof it. Anyway I do greatly appreciate the information because I hope to keep my system together and at least it sounds like this might be more of a possibility. I did download a GFA 535 service manual but have nowhere near the understanding or the skills or the equipment to embark on such a project on either of these. Perhaps after watching a lot more episodes of your TH-cam presentation and more study I'll be more capable of doing this. Thanks once again
As you can tell I'm real to you to computers too do not complete that last comment regarding me programming 870 and my my 1070 in my power amplifier. It was brought to my attention that it was very unlikely that that was liquid coming out of my transformers but rather some type of adhesive technicians use when they're working inside of these units. I also went back and crossed checks the appearance of my units 2 large capacitators, I believe they're called the power capacitators. I noticed that they had been replaced. This made sense since just prior to my purchasing this model it had been bench tested by a technician with 30 years of experience. To make a long story short and I feel really foolish... I use both the power amplifier and the Yamaha RX-V1070 simultaneously to provide a surround sound type configuration hi-fi listening experience. My front speakers have four terminals for bi amplification or bi wiring. And I had experimented around with using either the 1070 or the power amp in a bi wire configuration. The whole problem turned out to be easily solvable and had nothing to do with either amplifiers performance. Encouraged by the information acquired by this program I had unboxed my Yamaha and my adcom just to double-check to see if the problem might be with the speakers. I was so focused on the concept of age and the need for renewal or new capacitators on vintage stuff that I neglected to look for something more simple. As you may have already guessed I had forgotten or missed my replacement of one of the shortings on one of my front ( left )speakers pair of terminals which is necessary when you are only using a basic single terminal input. The shorting was over one but then off to the side and just barely touching the bottom rightportion of the tournament was supposed to be connected over. Since these are mud best speakers anytime I get a lesson satisfactory audio performance from something having to do with the system whether it be the Yamaha or the adcom I would hook the suspected unit up to them. But apparently this was a systemic problem too as the rear speakers a demonstrate substantial loss of fidelity and power. I'm not sure how the front amplifier connected to a configuration involving a split source was able to backtrack up through my digital to analog converter and into the RCA y connectors and go back into the other amplifier impacting it sound performance. But that indeed was the case and as it turned out after correcting that shorting problem both amplifiers / preamp or receiver along with all four speakers are back to their original fidelity and power. I had boxed both the 1070 and the 535 up in the original boxes and had planned on taking them on about a hour drive to a technician I had talked to to have them diagnosed. Something he was going to charge $80 each for and then apply it to whatever repairs he would have recommended. And he was 2 to 3 months behind so I would have been without music for all that time and out hundreds of dollars.
I take great pride in my wiring and my connections and I'm baffled as to how I could have made such a stupid mistake except that it is dark in that corner of the room behind the speaker and I usually have to use a flashlight to see clearly.
Lessons learned. Never assume or make rush judgments based on insufficient information. And since that incident I have downloaded a service manual for the GFA 535. It is my hope that by the time it actually does need new capacitators or any other type of work I can learn enough and watch enough of these programs, and acquired the necessary tools to do this myself perhaps with a little coaching.
I had a RXV 2500 which must have shorted out and would no longer power on after generating white smoke consistent with some type of combustion. Being really new to all this that point I just took the loss and wrote that one off. I disassembled it out of curiosity and it indeed had had some kind of issue with the power transformer is the copper band around the outside it melted in the back. Had to know more into could have probably been repaired. I saved very circuit boards including the ones on which the two main or largest capacitators on that model. I also have an amplifier board off of a b i c subwoofer therefore would have two things to practice my soldering skills on. I'm not sure how I would test for current but since the subwoofer amplifier board is intact I imagine there's a way to supply it with enough power to check the transistors and the capacitators. The reason I have it is because it was on my original subwoofer and sent out for repairs and came back with the original symptoms. It's inside it just purchased the subwoofer and BIC has excellent product support and warranty coverage at that point they mailed me a brand new amplifier for the subwoofer.
Although I know very little about an electronics with regards to the technical inner workings I save this type of stuff because it fascinates me and I always think I might have a use for it in the future. Well now I have a use for the stuff I saved. When I got into vintage I had looked at a couple articles where people purchased vintage equipment in order to get high quality sound on a budget. And then they described how they were disappointed with the sounds but were then motivated to go out and do their first do-it-yourself recap job or whatever which let them to have the confidence to go on and do numerous repairs on their own equipment. But since that time I have learned that it is simply not that simple if you don't have a technical background.
But I also have the motivation of wanting to have access to the best sounding equipment possible within my financial
I think I'm going to lay off the public comments for a while. I start rambling and then I end up sending an unedited response before I have a chance to edit it so it's rather embarrassing. And I don't currently have access to a laptop or a desktop so it is weather hard to compose one this small screen smartphone
I'm more awake today so hopefully I can offer my appreciation to this program for helping me not disregard my Yamaha RX v 1070 which is the big brother of the one on this video. I did something really stupid followed by making me uneducated observation about the appearance of my transformers with regards to thinking of damaged and causing the Lost to the audio quality in power associated with this receiver. I also thought that I additional problems in that my adcom GFA 535 power amp and finally reached a level of usage based on its age to where it needed to be recapped. Then I noticed a comment made during the program about the likelihood of two separate things occurring at the same time such as this.
535 will at some point need new capacitators as it came out in 1987.however it was very likely used by my brother before
I used to work in a repair shop, some of recievers not so easy to work on, I don't know why they designed them so poorly. This one appears to be high quality & easy to take apart and fix.
whiskeyify And Yamaha had some of the poorest designs of the all. Harmon Kardon isn't much better.
Great channel this. I have a Yamaha a595a Dolby Digital amplifier and the right channel works intermittently. Thanks 12vVids.
Good save. Beautiful classic Yamaha
Relay was the problem on my RX-396 stereo receiver. You don't hear any sound until you push volume up, then works normally until you switch it off and on again. Cleaning relays contacts inside solve the problem. Now i have to took apart the second, RX-V420 surround receiver with the same (but not so often) problem.
think cleaning those contacts on the right channel relay helped me out, no contact cleaner atm so have to do that later. thanx a ton! err i got rx-v890 but the boards inside look older than the blue ones u working on, mine are like brown/tan kinda and the relay was kinda tucked away under another small board (forgot to look which). also relay cover was kinda T shaped. had to use solder wick instead since i dont have desoldering iron...that was quite annoying lol but thanx again!. also got that samsung x-main kit otw as i was given a 43 in recently rofl...there was quite the burn spot behind the MOV (varistor) so i duno if it did its job or blown. took out and diagnosed xmain issue...blah i should prolly be posting this on the other vid...should have the parts monday so we'll see
From Sydney, I say a great presentation - Ta
You don't replace to many components do you - repair - or fix - I like that !!!!!
+Donald Ellett I replaced failed components only.If I am doing an overhaul on a very old piece of gear, and the client has requested that I recap the unit, they I will change all the capacitors. Of course those clients know how much they are in for. Those ones are the audiophools as I call them. Have no problem dropping 400.00 to recap their amplifier.
12voltvids Not very smart of you calling potential customers fools.
ebaysnipa The people that would spend $400 (4 years ago) just to have all the capacitors replaced probably don’t try to fix their equipment so they aren’t watching these videos.
Nice. great explain. I have a problem with same amp get in to protection mode as soon as power on. By disconnecting the rear amp section same results. All the solder joints and relays looks good to me. can you please help me out? thank you
These yamaha pro logic amps are one of the best sounding for stereo music i shit you not!
Yamahaha made some good amps.
Yes the specifications were incredible on those models. They just don't seem to make it like that anymore.
@@danedwards4406 When yamaha amps said "natural sound" they certainly were, their phono preamps built into them are incredible too, japanese speakers are a BIG NO NO but japanese amps are the best.
I have an RX-V595a receiver that I bought new. It's a 5.1 surround sound AV receiver. Works great and love the sound, but I'm having trouble with the volume control. I tried cleaning it from the outside with some deoxit, but it only helps a bit. I guess I'll have to take it apart as well to clean it properly. Any thoughts?
I have the same receiver. No display and no sound, however it does power up as i can hear the transformer energize, there's a light on the volume knob and input button. No sound from any input/on any speaker output. It also "clicks" like a soft turn on after a few seconds of powering it up
Thank you for sharing this video. I bought one of these units new in 1993. It moved to the basement storage after a few months of usage. It sat there for most of its life till I recently decided to hear it again. What a sound, I love it when it is working well. But I have an issue with the left channel. It starts scratchy when the amp is cold. In one occasion, there was no sound from the left channel for a few minutes. So I opened the cover the cleaned everything that I could reach, however; the problem persists. When the amp is cold, the left channel has a scratchy sound and it gets better as it warms up by plaing 2 or 3 songs. I am looking for any advice that I could use to solve the problem, thank you.
Thanks for the help!
Very nice video and u are so smart can fig out the problem by ur own, I have a Yamaha RX-V2095 almost same as Yamaha DSP-A2, now having issues when I switched the unit on and I turn the Vol up to 10% no sound out but if I increase the vol more than 30% the sound come out from all speakers it happens randomly, one thing I've noticed about when sound restored I can hear the sound come out a bit weak start with and come back to normal peak after 2secs , is anything I can do about it? I love this AMP I wish I can keep it forever.
I had that exact same model. Gave it to my dad and it had some problem with display and he got rid of it.
My rx-v870 is starting to cut out on the right side. I really hope it is nothing serious. I inherited this from my dad its got sentimental value to me.
Most likely the speaker relay or bad solder. Open it up and give the relay a slight tap while on and see if sound cuts out or comes back. Good change that's the problem. Yamaha used shitty relays.
A nail file is WAY over-doing it on relay contacts. Once that precious contact material is gone - it's gone. There's lots of more gentle ways, but replacement relays are 5.00 or less on eBay. Nothing beats new.
+Mark Zacharias OK so a relay on ebay is 5.00 , then to ship ship to canada they want 45.00 then the broader firm because the shipper sent it fed ex instead of post wants another 40.00. Been down that road. Ordered a 23.00 item that ended
Costing over120.Also you are forgetting the fact that many of the parts that you buy off ebay are parts that salvagers have pulled out of scrap units. Just look at the fun I went through ordering a board from shopjimmy for my free plasma. Sure they made good and shipped me a replacement, but that took another 2 weeks to get, and I had it shipped to a receiving depot in the US to avoid shipping to Canada costs, which added the inconvenience of 2 trips across the boarder, and extra fees to receive it. That 15.00 board ended up costing me 55.00 plus my time.So in light of that, the file on the contacts fixed it, and the owner of the unit is happy.
I used to use a "relay burnishing tool". There are better ways. Relays I often buy NEW from China for less than 5.00 each (Omron 24V DPDT) with free freight in qty or 1.50 freight for two. You have to cut off two pins and they drop right in. Been doing this 40 years. You do nice work though.
+Mark Zacharias I too have been servicing electronics for many years. I first got my CET ticket back in 1983 when I was working for the Sony corporation. I retired from that line of work in 2003 as I could see the writing on the wall. These days it is just a hobby to help people get things going. Most of the stuff I repair here is mine, and is donated after it is done, so I am not making money from the repair, other than the advertising revenue from youtube. So I am not going to spend even 5.00 on a unit that I am giving away. If it breaks down 6 months later, so be it. I use recycled parts as often as I can. Only if it is a unit I intend to keep, like the 3 PlasmaTVs I did. Those are keepers, so I spent some money fixing those. The Bose system too, that was a paid job, so new parts went in it. The rest of the stuff people give to me to take to the recyclers. I fix what is repairable, and then either sell it off cheap, or in many cases give the unit away.
yeah,i use some 2000 grit sandpaper,just enough to get it working again and some deox spray
excellent video . i also have a rxv870 that when i plug the power cord on the ac outlet the stanby relay starts clicking and the unit does not turn on. any idea where to start from?
Interesting video. My V870 cuts out (shuts off) after turning on. I understand the protection circuit is engaging. I've solved the problem that caused it to trip, but can't get the circuit to reset. (Unplugged the unit, pressed and held ON button.) I hope the circuit doesn't need replacing, as I wouldn't know what to do. Any suggestion?
this is happend to me now, and thanks for this video, sometimes relay did not make a contact, same type too (DEC DH2TU) and this relay hard to find in my country. Bad news my Yamaha type case design did not allow to open from the bottom, so i have to totally tear down circuit to release those relay, is there any other way or special tool to open relay without dissasembly from circuit board?
My light on volume knob tends to fade in and out. I'm assuming it's a power problem?
well done .
The inside if that unit is really dust free and clean, especially for its age. Did you blow out any dust before you filmed this video?
Hello, need help!! it’s been more than 3 years last time I turned ON my RX-V, surprised that front right main channel isn’t working at all, no signal from the receiver (LFE) arriving to the sub, another issue that I noticed, when I touch the main couplers, the lower one “main-in, pre-out” at backside I hear a loud hum from the channel that isn’t even working which is front right, our local authorized dealer doesn’t help, they said due to its age, they doesn’t have its service manual, I’m sure they will get that online, so they didn’t do anything!!!
Appreciate any recommendations!!
RX-V 2095 (1999-2000) year.
Thank you in advance!!
Wondering if the problem is from that relay as what you mentioned is a common issue for that receiver in that era
Edited
Help 😥
What would cause a popping/crackling / tickkkkk sound in one of my stereo speakers?
I'm using #Yamaha rxv 1900
Hey, I know it's been 7 years, but I have one of these when I power it on, the screen is frozen and dim. There in no change at all on the screen ( but it IS on). And no sound comes through. Do you have any tips?
I have the exact receiver. I had to replace the display bulb, according to the sm the power to the display bulb is 14.5 volts 110ma. It burnt out the new bulb fairly quick. I checked the voltage myself and it's 14.5 volts ac? Is this normal for this? I had to add a rectifier and a resistor with a 12v bulb and now it's working fine. I just thought it would be dc volts. Thanks for your videos.
HAVE THIS ONE AND VERY DECENT GEAR
WEIGHT 15 KG
if you have any repair job for denon avr 2000g i would love to see that video
Hi 12voltvids. I have a Yamaha RX V659 that immediately goes into protection mode. The error code is dc prt 026 hi. There is no short found on the output transistors. Any suggestions? Thank you.
My Yamaha RX v 350 remote sensor not responding,remote ok with new batteries,light blinking when see through mobile camera. Can U plz help.
Hello guys. I have a yamaha rx-v771 av receiver and just recently there is no more sound coming out. Any idea whats the issue and how ro aolve it. Thanks. 🙏
I just picked up a RX-V850 in great cosmetic shape...but the input buttons don't work. It's stuck in tuner mode. Any thoughts on a possible fix for that? Also, is there a way to reset this unit? I've looked thru the owner and service manual but see nothing about a reset. Thought I'd try that first...if I could figure out how!
yamaha good,from indonesia like
My yamaha av amplifier dsp a592 VFD display is too dim.please give any solution for that
Likely the display tube if its s vfd. They do get tired as they are a vacuum tube and all vacuum tubes wear out
Love this♥
I'm having trouble with Sony str-d965 going into protection. upon checking I found two transistors shorted so I replaced them but still going into protection. Only getting .8 volt on protect circuit when it should be 5.2v. I can send schematic if needed and any and all help would be appreciated. ps I've learned a lot from your videos. thanks in advance
I Hope that you help me, I have a Yamaha vr x665 when turn on three seconds and goes off without speakers I disconected the three stk power amplifiers without succes, thank you very much
My volume shoots to 100% on the right speaker if you so much as look at it.
I have a pioneer vsx d620s and the surround speakers don't work any advice
Profesionalist !
I have an iwal but I turn it on and it lasts for a few seconds and it goes out just what will it be? help
Hey 12voltvids, I have this model I bought new in 1994, it has started turning off/ shutting down after I crank it for several minutes. Running old Klipsch KG5.2 loudspeakers. What can I check or clean to repair, I love this thing, it rocks hard!!! Thanks...Tony in NC
Yes that's right probably no S-video until early 1990's . i was guessing exactly 1994 !
You showed us a loose contact but you never fixed it! ... Did you forget? :)
Of course I fixed it. Ever heard of "editing"
I have this exact amp, but I haven't used it in years because the display kept blowing the backlight bulbs, and I never figured out why.
Often tungsten bulbs are not designed to work for many hours. Could also be the voltage on them is a little high. i would try replacing them with a white LED with an appropriate dropping resistor.
@@Geopholus i actually tried that, and they blew as well. Something is causing a voltage spike to the backlighting circuit.
@@DadYouNeverHad That's a little surprising. Did You look at the schematic? Where does the supply come from? Used to be incandescent supplies were often a 6.3 or 12 volt winding. The new LEDs can be lit quite brightly from a 5 volt supply even with a 10-20K dropping resistor. Maybe yours is operating from a 15 volt regulated supply that is no longer regulated? I Really i have no idea without looking at the schematic. Did You match the original lamp number?
Hi. I have a old pioneer stereo amplifier, which sounds terrible on the right side when volume is increased. could it be the transistors controlling that channel be bad, as a speaker that was not meant to be on there was powered on that channel. Thanks
It could have popped a transistor fpr sure. Need to check them with a meter.
How Many watts are the Yamaha
Never use an abrasive in relay contacts! If anything, use a burnishing tool, or stiff paper to "polish" the points. Once you damage the plating on the points, they will not last and the problem will return sooner than later. Sure, it is "fixed" for now. A brand new Omron relay is inexpensive and will last for years.
Still working after all these years.
Hi 12voltvids, i have RX-V567 without any sound on any inputs. I don't have indicators on display (L,R,C,SW...etc). I have last firmware. I reset receiver, no result. Do you have any ideas, what can try.
Bad dolby sound decoder cpu. Just search the model number + no sound for a fix. I also have a rx sytem and my fix was heating it up with a heat gun but its not a perm fix. There is a recall on that chip and on the documet provided by texas instruments with recalled chips are also direct replacements listed that dont have the same issue
Hola, soy Andrés de Argentina, tengo un Yamaha RX V 1070 muy similar, dejo de recibir FM pero si en AM como puedo ponerme en contacto con usted? Sds
good lord man...straighten up your bench. dont want it looking like mine
Wouldn't you replace these relays if they're out?
They can be cleaned up and will last a long time. Replacing them is an expansive option. Ordering from companies like digikey or mouser will cost 50 or so dollars by the time it gets here. Customers have limits on what they will pay. I made 40 on this. If I told the customer it would be 90 to repair it he is saying forget it I don't want to spend the money. The majority of the units I fix for people are selling them on ebay so they don't want to spend much. Just get them running so they can sell.
Thank God it doesn't have those Sanyo block amps that died and killed my Yamaha R-100 receiver.
nail file are good for this job
Too coarse, aluminium paper is better
600 grit sandpaper also works good
can i send you my pioneer for fixing ?
Is anybody still using these old prologic receivers for surround sound on a modern setup?
They sure are. Not everyone has a need for, or wants 5.1, or 7.1 channels. To many people pro logic is just fine. It all works just as well today as it did when new.
12voltvids I've Been running mine in stereo which has sounded good.. but I might hookup the rears and a centre to see what effect it has. I thought pro logic had to have the extra information mixed into the stereo channels for it t work correctly. I wasn't sure if it was obsolete now or not. I'll try it. Thanks man.
@@switch96551
Pro logic works by subtraction and addition. The left and right channels are added to produce your center channel and subtracted to produce the rear. In a stereo mix there will always be information decoded due to phase differences between the left and right channels. There information is there.
So what would cause my yamaha it's from the late 90's to sound like crap in one speaker but I increase the volume a little and the problem goes away?
Could be a few things. Could be a dirty volume control if it is a linear control.. Another thing is a problem in the biasing circuit and the output transistors are going into cutoff. This is most noticeable at lower listening levels. In a class B amplifier (push pull)one transistor (or tube) conducts for the positive swing of the waveform, and another for the negative half. At that point where they switch crossover distortion (IMD) is generated. To minimize this class B amplifiers are biased into what is known as class AB. A small bias current is introduced into the outputs to keep the transistors from going into complete cutoff at zero status. This greatly reduces crossover distortion.If one of the resistors that provides this bias goes open then the transistors go into cutoff, and distortion is introduces, and this is most noticeable at very low levels.
So would cleaning the replays possibly fix my issue?
Aaron bilger
yes sometimes the speaker relays go bad.
Tengo uno iwal pero cuando lo prendo dura como 3 segundos y se apaga a qe se deve ? Espero respuesta gracias 👍
You have to write in inglish men ... Escribe en inglés
get those pliers out of there. I would never pull on the solder tabs like that. you are lucky that the solder and pad didn't rip off the board.
That model in from 1994/95
That's from 1993, so not too old.
WestSideJooo 22 years is considered pretty old for electronics.I would have thought it was older than that as it has no S-Video or component switching, and s-video was around back then. Oh well, still a good piece.
Speaker relay's? What do you even need those for? Other amps don't have them, just bypass them!
Speaker relays are there to delay connecting the speakers until the amp has settled down, and there is no DC voltage on the output. It also cuts the speakers off as soon as the power is cut so the gradual discharge of the power supply caps will not cause a DC voltage to appear on the speaker terminals and potentially damage the speaker. Only a fool would bypass them.
You only work on the old electronics!!! I would guess not!!
+Donald Ellett No I work on modern stuff too. Old gear makes me more money though, because people with the classic gear don't want to part with it. Can't blame them. I won't be parting with my Sansui 9090, or McIntosh 1600 any time soon.
@@12voltvids Whats the best receiver you've heard?
I know those late 70s receivers like Sansui, Pioneer, Kenwood were built like tanks.
@@danlivni2097
My old sansui 9090db sounds pretty good.
@@12voltvids Those Sansui Receivers in the late 7os and integrated amps were amazing. They were built and made with metal parts.
My friend has the Sansui G9000 and that receiver is as good as it gets. The tuner is very impressive on the G9000
@@danlivni2097
Worth big bucks today. Recently a sansui 9090 sold for 1500 at the vintage audio store.
Mine is in good bit not perfect condition. I should overhaul it some day as it needs service but I dont use it. In storage.
Bahasa indonesia
saul-der
I have the similar problem with RX-V393 hear here: th-cam.com/video/SAo671gBZZw/w-d-xo.html