I have a lot of respect for JVC gear of that era.. Wasn't keen on the looks, but they were literally "sell it and forget it".. they never came back through the workshop.. 38 years on.. a couple of caps.. superb
My JS401 is still cranking tunes. I bought it brand new 1978. At that time, Pioneer was the chit. My friends gave me crap about the looks, until it was cranked up.....
I'm a tech my self 30yrs plus in the repair trade of amplifier, tv, and video stuff and seen many many faults that drive us nuts..it's good to see step by step fault finding done.
It's amazing to see (and learn) the way you narrowed down the problem area so quickly. You made picking a needle from a haystack look so easy. Thank you! I'll contribute.
Great video. You're really inspiring me to get back into Repairs again. I love the troubleshooting steps, the patience to keep digging and mostly just inspect visually. I remember fixing so many little things by just simple observation.
I just bought on of these from Goodwill on line. I like the retro space ship look. I hope it works when it arrives. It was tested to power on. This is a great video!!! Update it works. I recapped power supply, Eq board and installed new lamps all is well.
All the newbies out there see “Darlington Power Pack” on a receiver like this, and scatter. Yes, I replaced mine. But my SX-780 is going on 40 years old. If they were discreet transistors, they would likely need replacing as well. Never was a big fan of JVC receivers, but this one does look and sounds quite nice.
Troubleshooting is fun. There are times when I will throw my hands in the air and not proceed. Digital stuff is far more difficult to bit bash and I will generally walk away. I have done a few TVs where I did component level repairs of the boards, but I was doing this just to prove to a troll that I could do it.
Thanks so much for this, helped me troubleshoot the same problem on the same amp I bought recently, your a star! Great explanations and fault diagnosis.
Awesome Repair your video's Teach me so much, You don't recap a whole entire board, like you did Isolate the problem you got to the root of the problem and fix it,
Hobbiests typically just shotgun the entire board because they don't understand or have the experience or knowledge to diagnose the component that failed.. There are exceptions, such as in critical applications such as life support equipment or critical equipment such as in nuclear power plants where a failure can not occur so they will swap out the board, and the old board will be totally rebuilt, but in non life support or mission critical devices, any engineer worthy of being called an engineer will troubleshoot and find the root cause and replace just the part that caused the failure.In consumer electronics, entire boards were not available, and had to be repaired to component level, as the cost of a replacement board was more than the cost of a new unit. That continues to this day.
At around 7 minutes you show a feed on your oscilloscope of the tuner input and output. Is that what those metal prongs sticking out of the board are typically for? I see those sometimes in older gear but never knew what they were for. I'm assuming if they are exactly for that purpose that they were put there specifically for technicians to help with repairs?
Nope. Wire wrapping was popular for awhile. It was fast, and quite reliable. Telephone industry used wire wrapping for years to make connections at the central office. Still in use in many switching offices.
im working on same prob on a 301 recaped everything on main boards now im working on the eq board looks like same prob u got i seen on mine the bottom trace is shot plus the caps are not looking so good. will revisit the prob monday till then ill drink my probs away!!! thanks for the vid
Smashing repair :-D, an old unit but very nicely layed out pcbs, symetrical parts grouping is always nice to see, makes comparison easy. it's so obvious what does what :-D i've not seen too many of that brand of crapacitor go wrong, but most were in audio coupling. Elna made pcbs, hand drawn but they worked fine :-)
My brother bought this receiver in the late 70s if I remember correctly. My brother told me that it was the first receiver with an equalizer build-in but I do know if it's true. Anyway his receiver got a broken relay years after. Sorry for my bad English
Looking at the board at 20:00 min, the caps look bad (heat-shrink is uneven around the top). Check ESR. It's likely $2 worth of caps to replace these. Surely the client wouldn't mind.
Nice unusual looking and nice sounding receiver, just wondering your take on cleaning slide pots. Not sure if it was yourself or another channel (possibly either Shango or Jordan Pier) who mentioned that slide pots have a tendency to degrade badly if over-cleaned? (As in drowned in cleaner rather than a shot like the D100 can gives you) I've learned this myself, the hard way, and just wondering if you've seen this or what you think might cause it on sliding over rotary controls as I wouldn't have thought it until I noticed sliders getting worse the more effort I went to & then hearing the comment that the cleaner was killing them.
I use Servisol Super 10 (easier to get in the UK and works well generally. I keep saying I should treat myself and try some deoxit just never seem to be able to justify the price without having tried it first) but something about the sliders they just don't seem to like it.
@@12voltvids Good to know, I have a few things to be serviced eventually and I think you do great work. I'll contact you when I am ready. Hopefully you are in the lower mainland or not too far away. Cheers.
Hi, my Proton 300 has no sound. I'd be willing to ship to you for repair due to your knowledge. How much would that cost me? I'm in new jersey are. Thanks
Then Darlington power pack is just that. A pair of Darlington transistors and bias resistors. The rest of the drive circuit is in a seperate voltage amplifier. The STK power pack put the voltage amplifier and outputs in one package. They were supposed to increase reliability. That wasn't the case.
I Had A Couple Of Those That Done That Before I Could Get The Noisy EQ Control Over The Main Amp Bu No Sound When I Turned up The Volume Cintrol Till I Cleaned The EQ Control.
Great video and repair on the JVC classic receiver!. You are a master tech! Thanks for posting. I'm just a hobbyist and will be working on one of these JVC units. Problem is "No Power" I have the service manual. I'm going to start with the power supply and stand by power supply. Any suggestions would be appreciated. I don't have any specialty equipment, just multi meter. I'm determined to fix it. I had one years ago and it sounded great. Cheers!
Hello i have a Jvc Rx-662v when i turn it on it clicks. But it doesn't produce any noise at all, and the red light on the volume knob isn't on. What could be the problem?
Hello again . Please help . Like I said I picked up the jvc jr s201 and is exactly the same problem as the one that you repair online . When you operate the eq scrash sound on the speakers all the fuse are ok. Now on the sound board in the back those 4 caps the two big one have plack point on the top . Like paint or leaking?? I have a pic . Please help
@@nodieskysgonzales these were made around the time of the capacitor cancer era. With those double sided crap boards this one has a close inspection is really needed as when caps leak they can corrode the board and cause either an open or a short. It's been so long since i have looked at one of these. Over 4 years.
I am gonna try to fix it locally. I just paid 60 can for the unit and really good shape . I love this old amps . I have jr 301 and 401 as well and they sound so powerful way better that other one made this days . Thank you very much again . Much appreciated
Nice job, I really love these videos. This unit, wow is it it grungy and dirty looking inside. I'm sure it hasn't gotten all that much love in the last few years. These units also seem pretty popular, always on the bay and even on CL. Kinda fugly IMO.
I have a receiver that turns on and does not emit sound, if I increase the volume with the control it makes pac at each touch. I have no idea about electronics, but I was researching and it has transistors 2SB1429 first in green and 2SD2155 in black, I'm afraid they are burnt and are no longer available.
ugh i don't miss that cellular noise that comes thru radios. if i remember right, its mostly bands like 3G and older that gave off that noise. if it buzzed a couple of times, it was likely a network reconnect or a text message but if it was a constant buzz, you were getting a phone call. hated it!
This thing is a IoT (internet of things) device. It does have a sim card in it, but I have no idea what band it is transmitting on, or what it is doing. Actually I do know what it is doing, I am just not permitted to say due to a NDA I had to sign. I can only say it is a scientific research device and nothing more.
What did you mean by you can't sell it when it isn't working or was that just a slip of the tongue? Because I and I'm sure you also have bought many nonfunctional devices. It's the challenge of getting them working that is the fun part.
Like I care. All capacitors will eventually fail. A wise man once said. "The reliability of any electronic device is inversely proportional to the number of electrolytic capacitors it contains." When another one fails I guess if it is still in service I will see it again. If the owner wants to pay to change them all then that is what is done but I have yet to have anyone bring in anything, in the 35 years I have been servicing electronics and say "recap it, change em all, dont worry about they cost, I want em all done" not once in 35 years.
I miss nothing. I did exactly what the client wanted. Got it working. No more. If I was told spare no expense then that is a different story but I had a 40.00 limit to fix this so that is exactly what I did. Showed the fault. There is a difference between a repair and a rebuild. Don't get many that want a rebuild on anything. Everyone wants stuff fixed as cheap as possible so they can flip it on ebay. Sorry if you don't understand the way business works.
@@12voltvids excuse my stupid comment ...i love your videos im learning a few things too..thanks sorry if i sounded like a ass take care. i collect reels to reels and most are easy fixes solder joints etc.
I have a lot of respect for JVC gear of that era.. Wasn't keen on the looks, but they were literally "sell it and forget it".. they never came back through the workshop.. 38 years on.. a couple of caps.. superb
My JS401 is still cranking tunes. I bought it brand new 1978. At that time, Pioneer was the chit. My friends gave me crap about the looks, until it was cranked up.....
That's a cool old receiver. Nice non typical appearance. Thanks for explaining each step and keeping the camera running! Nice job.
The trolls don't like this.
That is ok, because we know what trolls are.
@@12voltvids 44mins of my life well spent
I'm a tech my self 30yrs plus in the repair trade of amplifier, tv, and video stuff and seen many many faults that drive us nuts..it's good to see step by step fault finding done.
It's amazing to see (and learn) the way you narrowed down the problem area so quickly. You made picking a needle from a haystack look so easy. Thank you! I'll contribute.
Inspiring! The amp was thanking you by playing beautifully while you were putting it back together. Even the leaf blower cooperated.
Thanks for a great repair. I love watching audio repairs with a scope.
This is a very very common problem on these JVCs, especially on the 401 and 501. Very nice to see a video was made on troubleshooting this issue.
We used to have a sign that hung in the shop that did not list JVC as the Japan Victor Company.
My first guess if both channels are out, it would seem like a supply voltage problem. That was some damn good troubleshooting.
One of the best walkthroughs of troubleshooting and repair I’ve seen. Thanks so very much!
Excellent sounding vintage amp
One of JVC best
Great video. You're really inspiring me to get back into Repairs again. I love the troubleshooting steps, the patience to keep digging and mostly just inspect visually. I remember fixing so many little things by just simple observation.
I just bought on of these from Goodwill on line. I like the retro space ship look. I hope it works when it arrives. It was tested to power on. This is a great video!!!
Update it works. I recapped power supply, Eq board and installed new lamps all is well.
Another awesome fix!
That was my first new receiver. I bought it because I like the Marantz flywheel tuning. I sold it and now have 6 Marantz receivers.
that IS a good sounding receiver
Impressive diagnosis , fault was a elusive one
Love the videos love the explanations a pleasure to watch
Yet another fine video, thank you, I am learning a lot from your channel.
All the newbies out there see “Darlington Power Pack” on a receiver like this, and scatter. Yes, I replaced mine. But my SX-780 is going on 40 years old. If they were discreet transistors, they would likely need replacing as well. Never was a big fan of JVC receivers, but this one does look and sounds quite nice.
The darlington power packs were far more reliable than what came later where they put the complete amp inside a IPM. (IPM=integrated power module)
A classic early 80s JVC
less than one hour repair, perhaps 100$
back then, I'd pay that to repair it, well worth it.
I wish I could get 100 for it. I will be lucky to get 50.
it is so much critical circuit board . you are best technician ,that is why you solve the problem .
Troubleshooting is fun. There are times when I will throw my hands in the air and not proceed. Digital stuff is far more difficult to bit bash and I will generally walk away. I have done a few TVs where I did component level repairs of the boards, but I was doing this just to prove to a troll that I could do it.
Thanks so much for this, helped me troubleshoot the same problem on the same amp I bought recently, your a star! Great explanations and fault diagnosis.
Awesome Repair your video's Teach me so much, You don't recap a whole entire board, like you did Isolate the problem you got to the root of the problem and fix it,
Hobbiests typically just shotgun the entire board because they don't understand or have the experience or knowledge to diagnose the component that failed.. There are exceptions, such as in critical applications such as life support equipment or critical equipment such as in nuclear power plants where a failure can not occur so they will swap out the board, and the old board will be totally rebuilt, but in non life support or mission critical devices, any engineer worthy of being called an engineer will troubleshoot and find the root cause and replace just the part that caused the failure.In consumer electronics, entire boards were not available, and had to be repaired to component level, as the cost of a replacement board was more than the cost of a new unit. That continues to this day.
At around 7 minutes you show a feed on your oscilloscope of the tuner input and output. Is that what those metal prongs sticking out of the board are typically for? I see those sometimes in older gear but never knew what they were for.
I'm assuming if they are exactly for that purpose that they were put there specifically for technicians to help with repairs?
Those are wire wrap stakes where the connection is made.
12voltvids So they aren't specifically put there to help diagnose problems but you use them to check out signals, gotcha.
Nope. Wire wrapping was popular for awhile. It was fast, and quite reliable. Telephone industry used wire wrapping for years to make connections at the central office. Still in use in many switching offices.
im working on same prob on a 301 recaped everything on main boards now im working on the eq board looks like same prob u got i seen on mine the bottom trace is shot plus the caps are not looking so good. will revisit the prob monday till then ill drink my probs away!!! thanks for the vid
This is a very cool unit.interesting.
Smashing repair :-D, an old unit but very nicely layed out pcbs, symetrical parts grouping is always nice to see, makes comparison easy.
it's so obvious what does what :-D
i've not seen too many of that brand of crapacitor go wrong, but most were in audio coupling.
Elna made pcbs, hand drawn but they worked fine :-)
My brother bought this receiver in the late 70s if I remember correctly. My brother told me that it was the first receiver with an equalizer build-in but I do know if it's true.
Anyway his receiver got a broken relay years after.
Sorry for my bad English
Do you charge extra for chassis dust removal?.Not trying to be picky,reminds me of my days as an audio tech in n.y.c.Good video.
LOL!
Thanks, very educational and entertaining.
Looking at the board at 20:00 min, the caps look bad (heat-shrink is uneven around the top). Check ESR. It's likely $2 worth of caps to replace these. Surely the client wouldn't mind.
Nice unusual looking and nice sounding receiver, just wondering your take on cleaning slide pots. Not sure if it was yourself or another channel (possibly either Shango or Jordan Pier) who mentioned that slide pots have a tendency to degrade badly if over-cleaned? (As in drowned in cleaner rather than a shot like the D100 can gives you) I've learned this myself, the hard way, and just wondering if you've seen this or what you think might cause it on sliding over rotary controls as I wouldn't have thought it until I noticed sliders getting worse the more effort I went to & then hearing the comment that the cleaner was killing them.
I use Servisol Super 10 (easier to get in the UK and works well generally. I keep saying I should treat myself and try some deoxit just never seem to be able to justify the price without having tried it first) but something about the sliders they just don't seem to like it.
Great diag and fix! They still use the GTD-5 switch in your COs?
Is the d100 the best for faders?
They actually have one specifically for faders but this is all I have and it works good.
another great video
Hi, nice work, just wondering are you in British Columbia?
Yes in BC
@@12voltvids Good to know, I have a few things to be serviced eventually and I think you do great work. I'll contact you when I am ready. Hopefully you are in the lower mainland or not too far away. Cheers.
@@crushingalldeceivers
I am in the south.
Hi, my Proton 300 has no sound. I'd be willing to ship to you for repair due to your knowledge. How much would that cost me? I'm in new jersey are. Thanks
Nice trouble shooting! Thanks.
about the darlington power pack what is your opinion compare with stk.
say hello to your cats from indonesia.
Then Darlington power pack is just that. A pair of Darlington transistors and bias resistors. The rest of the drive circuit is in a seperate voltage amplifier. The STK power pack put the voltage amplifier and outputs in one package. They were supposed to increase reliability. That wasn't the case.
Excellent!
I Had A Couple Of Those That Done That Before
I Could Get The Noisy EQ Control
Over The Main Amp Bu No Sound When I Turned up The Volume Cintrol Till
I Cleaned The EQ Control.
Great video and repair on the JVC classic receiver!. You are a master tech! Thanks for posting. I'm just a hobbyist and will be working on one of these JVC units. Problem is "No Power" I have the service manual. I'm going to start with the power supply and stand by power supply. Any suggestions would be appreciated. I don't have any specialty equipment, just multi meter. I'm determined to fix it. I had one years ago and it sounded great. Cheers!
How can anyone with an interest in vintage Hifi not find this inspiring. Ignore the Trolls they get fed only from a reaction.
The only reaction they get from me is the mute button.
Nice Heirloom....i like it..you are the master..thanks for taking us along.. JVC.. Does that stand for japan victor corporation ??
Interesting repair, thumbed up! :)
Hello i have a Jvc Rx-662v when i turn it on it clicks. But it doesn't produce any noise at all, and the red light on the volume knob isn't on. What could be the problem?
Great Video Great Figuring out !
Hello sr . Great video . I will pick up the same unit tomorrow with the same issue. Where are you located ?? GtA by any chance??
Gva
Yes all the way to the west coast. Man is to bad . Keep on going with the great work with electronics. Thank you
Hello again . Please help . Like I said I picked up the jvc jr s201 and is exactly the same problem as the one that you repair online . When you operate the eq scrash sound on the speakers all the fuse are ok. Now on the sound board in the back those 4 caps the two big one have plack point on the top . Like paint or leaking?? I have a pic . Please help
@@nodieskysgonzales these were made around the time of the capacitor cancer era. With those double sided crap boards this one has a close inspection is really needed as when caps leak they can corrode the board and cause either an open or a short. It's been so long since i have looked at one of these. Over 4 years.
I am gonna try to fix it locally. I just paid 60 can for the unit and really good shape . I love this old amps . I have jr 301 and 401 as well and they sound so powerful way better that other one made this days . Thank you very much again . Much appreciated
Nice job, I really love these videos. This unit, wow is it it grungy and dirty looking inside. I'm sure it hasn't gotten all that much love in the last few years. These units also seem pretty popular, always on the bay and even on CL. Kinda fugly IMO.
I have a receiver that turns on and does not emit sound, if I increase the volume with the control it makes pac at each touch.
I have no idea about electronics, but I was researching and it has transistors 2SB1429 first in green and 2SD2155 in black, I'm afraid they are burnt and are no longer available.
Are these old receivers worth buying ? I'm loking at one with same problem.
Nice job.
ugh i don't miss that cellular noise that comes thru radios. if i remember right, its mostly bands like 3G and older that gave off that noise. if it buzzed a couple of times, it was likely a network reconnect or a text message but if it was a constant buzz, you were getting a phone call. hated it!
This thing is a IoT (internet of things) device. It does have a sim card in it, but I have no idea what band it is transmitting on, or what it is doing. Actually I do know what it is doing, I am just not permitted to say due to a NDA I had to sign. I can only say it is a scientific research device and nothing more.
yupr same two green caps ,right now I am listing to unit through rca outputs thanx again so very much I don`t have a signal gen or ossiliscope .
Great to look over your shoulder. 12voltvids at its best!
What did you mean by you can't sell it when it isn't working or was that just a slip of the tongue? Because I and I'm sure you also have bought many nonfunctional devices. It's the challenge of getting them working that is the fun part.
I don't buy non functional devices. People give them to me. If they can be made to work I sell or give away. More gets given away.
Thanx so very much i have same unit with same issue
Probably the same damage as well. Capacitor piss is relatively corrosive.
@@12voltvids don't have a good smell either
Your best video dave, love these old hifis, as basic as this unit is, id rather have it than any of todays modern black plastic shite
Yes the old stuff is cool compared to the modern black plastic crap.
@@12voltvids Those pcbs solid soldered
Weird that my slightly newer JVC has normal transistors for the amplifiers instead of the power packs.
Even If The Tracer Is Green
Instesd Of Using A Jumper Wire You Can Always Use Some 1000
Gritt Sandpaper To That Green
Tracer Then Install The New
That funny I had the same receiver with the same issue easy fix this receivers sounds very good
Never mind the bullocks!
You forgot to solder the lead of the first capacitor but it seems to be making contact.
He probably fixed after!
All those blue caps will go bad. Those are the same caps in Technics reel to reel decks.
Like I care. All capacitors will eventually fail. A wise man once said. "The reliability of any electronic device is inversely proportional to the number of electrolytic capacitors it contains." When another one fails I guess if it is still in service I will see it again. If the owner wants to pay to change them all then that is what is done but I have yet to have anyone bring in anything, in the 35 years I have been servicing electronics and say "recap it, change em all, dont worry about they cost, I want em all done" not once in 35 years.
Real time ha I thought most the videos were real time
I bet the esr of all those blue lyrics is sky high
No big deal. They are not in a switching power supply.
Lyrics are NOT for audio coupling
Leaky cap jizz, elna board, no JVC branding there
Now i think i know why my Magnavox receiver has an fm problem
Casecase
electrolytic s are on the neg rail in this car anyway
Why not solder all those other pins? Cause if the damn thing is working don't f*ck with it. (smile)
Casecarcasecsr
your videos are ok but i notice you miss stuff.
I miss nothing. I did exactly what the client wanted. Got it working. No more. If I was told spare no expense then that is a different story but I had a 40.00 limit to fix this so that is exactly what I did. Showed the fault. There is a difference between a repair and a rebuild. Don't get many that want a rebuild on anything. Everyone wants stuff fixed as cheap as possible so they can flip it on ebay.
Sorry if you don't understand the way business works.
@@12voltvids excuse my stupid comment ...i love your videos im learning a few things too..thanks sorry if i sounded like a ass take care. i collect reels to reels and most are easy fixes solder joints etc.
naprosté dno opravy.
Yall mfs so insecure with yall sexuality. Just bc he around dude dont make him gay also. Focus more on your life than others then youll be happy
WTF?
hate this auto spell and can not turn off for shite