JVC JR S200 Random Blast of Noise
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- เผยแพร่เมื่อ 1 ต.ค. 2024
- This receiver would play music, but occasionally would emit random blasts of noise, sometimes extreme enough to throw it into protect mode. This video outlines the steps taken to clear that issue, as well as other noise issues.
#electronic #electronicrepair #vintageaudio
Ray ... Thank you and your correspondent for "Terminal Fretting" ... it's going to be a very interesting read.
Way back in my early experience days an advanced co-worker asked me "Did you jiggle all the cables and tap all the sockets?" ... The explanation was that even if it wasn't evident in the air conditioned repair shop, bad connections can show up in the field and it's wise to always test the quality of every cable and socket before sending equipment back.
Since then I've made it a regular practice and it's surprising how many good quality cables and connectors are actually on the brink of failure.
Douglas, it's alternately exhilarating or daunting how much stuff there is to learn. No matter how far along the road you're on, there's always more.
@@raygianelli3612
What do computers and electronics (my two main fields) have in common?
They both take the pride right out of you as you have no choice but to realize just how much you do not know.
If I ever absorbed it all, I'd expect my head to explode.
@@Douglas_Blake_579 You're spot on as usual, Douglas. I had a sig file once that said "anyone who believes the definition of insanity is doing the same thing twice and expecting different results has never used a computer".
@@raygianelli3612
LOL... an Einstein rip off ... and very true!
Fun fact ... there are over 30,000 settings in a windows computer.
I've probably worked with less than 150 of them.
Thank God, there is the community and Ray for giving us explanations !
Roro, I'm passing on an explanation from one of the many fine viewers of this channel. Just one more reason I read all the comments!
i have always loved jvc gear but i just can not get past sliders for volume. balance is fine. eq is fine but volume? nope. i won't do it. i wont do buttons either. i gotta have a knob, the bigger, the better.
God, I love it when you talk dirty. 😝
But seriously, there is a tactile feel to spinning a heavy machined volume knob. It gives the impression of quality.
I agree with everything you said and yes it's important to switch to something else when stuck on a problem. When I have a problem that I'm not solving I will sleep on it if possible. I've literally woke up out of a dead sleep with the solution on several occasions.
Boy, isn't that the truth? I remember waking up out of a dead sleep with the solution when I was younger. Now when I wake up out of a dead sleep it just means I have to pee!
@@raygianelli3612 😂 Me too! I forgot to mention, I appreciate you and others mentioning your struggles with equipment. We all do struggle and anyone who doesn't it's because they don't do anything.
@@ohmbug10 While I didn't make a conscious decision to leave in all the wrong diagnoses and other errors I make, I soon received feedback that it gave others with less experience the sense that it's OK to make mistakes, because as you so correctly point out, the only sure way to avoid errors is to not do anything.
@@raygianelli3612 🤣 ditto
@@raygianelli3612
LOL... I never make the same mistake twice... Because I'm too busy making new ones.
Hi Ray, I have never seen a JVC unit with such beautiful gauges. Yes, connectors, that trained me too - see the email I wrote you. I have such a rhyme - you expect a problem from the river and it will come from the forest.
But as always RAY : Fault - 1 : 0 👍
Nice day 🙂 Tom
Thanks Tom, always nice to hear from you!
As I say, my only superpower is that I refuse to give up. 😁
@@raygianelli3612 Well, we have the same thing, it has one disadvantage - sometimes it doesn't pay off financially, but the feeling ...........🤣
@@Edisson. Yeah, it does feel good when you stop beating your head against the wall. 😝
@@raygianelli3612 🤪 .......... 🤣
Whew I dodged a bullet on one of these I guess. I took one of these in as the second paid repair I ever did. Thankfully the power amps are an absolute breeze to remove and rework, one of the easiest I’ve done thanks to the card design! sure am glad it didn’t have this sort of issue. Great receiver though, and extremely powerful (I forget 160-180wpc?)
110 watts/channel. Yeah, some of those boards would be a nightmare to remove. OTOH, somehow my dentist works on teeth in the back of my mouth. At least the receiver wasn't drooling uncontrollably or had to be asked to open wider repeatedly. 😝
You started off saying something about some people's poor impression of JVC products. Watching what you went through on disassembly and the challenging schematics makes me want to avoid them. Having said that, you did an excellent job explaining the diagnosis and blind alleys. Thanks for taking the time to clarify.
When you described the symptom, I thought the same as you did - noisy transistors/semiconductors. But this video makes me wonder if some of the noise from old transistors is actually being caused by wirebonds that come loose from years of thermal cycling.
Jeff, I've wondered about that too. Was it a bad part, or bad solder joints on the replaced part? Bad IC or just bad contact with the socket?
I guess I should just be happy it's fixed, but I really like to know root cause, if only for my own benefit.
Dear Ray,
Thanks for sharing this repairing video. The quality of the video was poor.
Uri! Nice to hear from you.
I don't know if you watched it right after it came out or recently. I know when first published the resolution is low, and improves after TH-cam finishing checking the content. Other than that, I have no idea why the video quality would be poor.
Ray, thank you again for your excellent work! I too have this same receiver. very understated to say the least. Keep up the good work!
Thanks Rob. Good to hear from you!
What a mess. I now have zero motivation to work on anything JVC. Glad you got it done without pulling out all your hair.
JVC made some really nice but underappreciated stuff. And receivers in general are more of a pain than integrated amps of separates. But yeah, it was no fun to work on.
Wow, talk about "service friendly", I'm not so sure about that! I'm glad you were able to get a schematic since I never have much luck finding them. Another great video Ray!!!
Alfonso, I'm able to get many of them from Hi-Fi Engine. I understand that for whatever reason they are no longer accepting new members. Let me know if there's something you need and I'll see if I can help you out.
@@raygianelli3612 Thank you so much Ray! Very kind of you! I will keep you posted! See you on the next video! Take care and be safe!
Cheers Ray !
Thanks to you, Ray. I know the contact problem very well. My very first experience with it was in my recording studio (a real pro one, I mean). It was with one of my analog multitrack machines, the MCI JH24. It was a nightmare. It has IC sockets everywere, and all of them was of a "normal" type, which make a chemical reaction between IC legs and socket contacts (lately, I knew this was endemic to this machine). So I embarked myself in the loooong task of changing all of them by a rounded-type ones (literally hundreds!). Really, since then I had no issues (30+ years). But in fact, there's always a chemical reaction, as you say, due to thermal stress, difference between materials, etc. The good thing about rounded pin sockets is a little bit like if you have a wire wrapped wire also soldered. You have almost 2 ways of connection: the wire wrap and the solder. In the round sockets, you have the rounded contact and the IC leg inserted and "nailed" to the socket hole. Excellent video, BTW. As always, thanks for sharing!.
You must have the patience of a saint to change all those sockets. But the results have certainly proven it was time well spent!
@@raygianelli3612 you can be very sure about that! 😅
@@raygianelli3612
As I used to tell my technicians ... "That's what the apprentices are for..."
Ray whats your turnaround time for repairs thanks
Anywhere from half an hour to half a year.