Sony XV-C900 analog video multi color corrector repairs
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- Опубліковано 3 лип 2021
- This 1990 Sony XV-C900 video multi color corrector had its back panel smashed in, so some mechanical repairs were needed. But then I also found a problem in the electronics...
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Oh, wow, there's got to be a follow up episode with this machine. We need to see more of it in operation and know what it can do!
Love ya DR Cassette !! It is one of THE BEST CHANNEL You Tube !!!
Thank you :)
Seems it is an aera provided to bodge componants for custom modifications or tuning, I believe I have already seen it into Sony broadcast VCRs also.
I had a similar thought.
Probably so. A service manual might give hints, if anyone's curious enough to try tracking one down online :)
Eventhough Sony’s industrial designers created a clever service friendly product, they did goof up the mechanical engineering on that sagging circuit board. As a structural engineer it hurts my eyes😖. If that was a concrete slab it would have failed catastrophically. On the other hand, it’s a nice demonstration of the flexture in a slab. A few extra standoffs wouldn’t have hurt I guess.
But then when the frame the boards were mounted to got bent, this was an advantage. Had the boards been mounted more rigidly, there would have been lots and lots of cracks from the impact...
really interesting device... I would really appreciate a more in-depth demonstration.
I will have a look at the schematics. I'm too young for knowing more than the basics about analog video circuitry, but it should be fascinating to see which clever tricks they used to generate the effects.
Whaaaat! No full recap? Are you kidding me hahahaha ROFL yeah right!
That thing would be just as bad to replace capacitors as an audio mixer! But if it's worth it, it's worth being done right!
You can blame Mr Carlson's Lab and XRayTonyB's channels for making us all aware of capacitor failure modes LoL, we have been ruined and now expect nothing short of excellence LoL...
Just this morning I had another comment telling me I needed to replace all capacitors. I am sick of people talking about things they don't understand. Last week someone told me about their friend who tried to repair a preamplifier that had a hum in the audio output by recapping it. Guess what? Recapping didn't fix the hum. So what did that person do? He recapped it AGAIN! Still didn't help of course, and when he finally passed it on to the person who told me the story, it turned out to be a shorted diode in a bridge rectifier. The people who recap everything regardless of the device or the problem are the ones who ruin this hobby for everyone. They do a totally braindead job that in most cases won't even fix any problems, but feel like they were experts. You can't do any proper repairs anymore these days without some self declared expert telling you that you need to replace all capacitors. I am sorry for all the beginners in this hobby who get a totally wrong idea of what they need to do to repair equipment by all this capacitor-mania.
@@DrCassette LoL you do realise that I was stirring you up!!!
I have been watching you long enough to know how you feel about the subject LoL...
Some of your viewers know you better than you realize LoL...
I have a very good understanding of capacitors, and I agree with you that just simply replacing all the capacitors won't always fix the issue!
But what I feel is going on here is on one side, you have the "replace all the capacitors people" and on the other side you have the "I have checked all the capacitors and they look all fine people", but what exactly does that mean? Were they just visually inspected? Were they ESR checked in circuit? Or were they pulled out of circuit and also checked for capacity and DC leakage?
It's definitely a touchy topic for a lot of people, there once was a time when someone else used to repair my equipment for me! They get it to work, maybe for a few months and it's dead again! Why couldn't they just fix it properly so that it can run for another 30 years? So I basically decided to take matters into my own hands a fix things myself! I don't have that problem anymore!
There are UA-cam channels that make repair videos that in my opinion should never be working on someone else's equipment!
Yeah, they found the problem fast! But a proper technician will check everything else as well, not just the leaky and burnt components! Some times you are going to need to pull components to test them, some times there's just no other way around it!
Imagine taking your car for a service and the mechanic finds a problem that is unrelated to the service and doesn't tell you about it! Oh! It's just a leaky shock absorber! It's no problem, the car can and possibly has been driving like that for a long time! But leaving the mechanical workshop you have to break hard because of some idiot and because you have a leaky shock absorber, you loose control of your vehicle and crash! But the shock absorber looked fine!
I'm sure that you understand what I mean, all the equipment that I have seen you work on is yours! And if you don't want to replace all the capacitors, I'm okay with that! It's your choice at the end of the day, but!!! If you appreciate your equipment, and you want to keep it operational for another 30 years!
Then as one of my favourite UA-cam content providers, I'm going to try and help you to get it that way, as much as I know about Electronics and repairs, there's probably that much more that I don't know and that's why I'm here! But if I feel that I can offer you something, I'm going to try and help, even if I have no idea what I'm talking about! But sometimes, I just might!
I replace all capacitors! The equipment is mine and I want it to be reliable. That's my choice! I test every single capacitor against a new one to see the condition of the original one, and they aren't all bad, a lot of them can be put right back into service... But as I said earlier, I choose to replace them all, and I always try to replace with a higher voltage version of the same capacity to get a longer service life out of my equipment!
Your probably thinking Yeah that's fine for your own equipment, but I have over 500 Amplifiers of all classes, I feel like I'm working on customers equipment! 30 and possibly 50 years from now, they will all be still working!
But it's still my choice at the end of the day, but when you say that you checked and it's fine, I'm thinking that perhaps you want this thing to keep working for a long time like me! And generally when people on UA-cam say that it's fine, it usually means that they used their in circuit ESR tester and found nothing! Which is usually the case, and me! Trying to be helpful, I go straight to the comments and start posting! Like a lot of people do! Some of us are not good at getting across what we want to say sometimes and it comes out wrong!
So believe me when I say, I really appreciate what you do, I enjoyed all your videos! I just wanted to be apart of what you do and at least be helpful!..
I know you were joking, my reply was more of a general comment, I'm sorry it came across wrong.
@@DrCassette no no, I understood perfectly well!
I don't have my own channel so I can't really say that I know exactly what you have to deal with when it comes to people in the comments section... But I believe that I have a good idea... It was a general comment in my eyes, and that's exactly how I took it. All is good, greetings from Australia.
Imagine actually trying to do that. I'm even too lazy to try to count how many there are, but, don't know, maybe over 200 caps?
I saw one of these still new In the box, It was old new stock, someone had ordered It, and never came back, and It sat on a Shelf for years. Wish I had picked It up now, It was for free just to get rid of It.
This weird area on the board with nothing connected looks like a prototyping area. More often than not, these machines which are complicated and expensive and not produced in great quantities have some bugs or an engineer has an idea for a spectacular effect that requires minimal hardware, so that would go into the prototyping area.
I recently got two Time Base Correctors, one of which appears to work (I couldn't find any of the problems I was told about, but I found that my monitor has trouble syncing the color frequency), the other was said to produce no signal. Turns out, using an old CRT instead of a modern LCD revealed that the signal looked... odd. There was mains hum on the picture. Like mad. So I scoped the power supply and it has terrible ripple. And then I saw it was doused in electrolyte. I'll have to completely depopulate the PSU to be able to mop that up.
What brand and model are your time base correctors? Indeed the old CRT monitors can display problems and imperfections in the analog video signal a lot better than the modern LCD monitors. You should be able to give the PSU a bath in isopropyl alcohol once all the leaky capacitors are gone. Isopropyl alcohol does a really good job at dissolving electrolyte. No need to completely depopulate the board...
@@DrCassette Thanks for the tip, that'll save a few hours (and a few headscratches from components I'll almost certainly put back incorrectly)
The working one is a ForA, the other is a Panasonic and both are virtually identical except for the paint job on the case.
Ah okay... I have a JVC KM-F250 time base corrector, and I have read online that those have bad capacitors in the power supply too, but in mine all the capacitors seem to be fine.
Great video and cool device., I was thinking that maybe the 'strange array of holes' in the circuit boards are for convection. Likely to help heat escape.
wow i just realized they filled the holes with solder? weird.
Sony's first DVD player, the DVP-S7000, also has multiple holders and "claws" inside its case to prop its boards up on. Its drive cover even has a special cut-out so the drive can be tilted in place to make connecting its ribbon cables easier. Oddly none of their subsequent DVD models have anything like that to make servicing easier.
Also if you ever see one of these for a good price grab it, they're very interesting technically and still produce a very fine "reference" CRT picture.
good job & nice explained
Thank you :)
hopefully you now or someone else will get much more use of it.
I will keep this device as part of my collection :)
Nice info
Nice video and an interesting device. I also have a lot of PAL equipment, but in these days of increasing resolutions they all tend to become obsolete. Are you going to really use this device or is it just for the purpose of collecting? Besides this all I like your choice of using the V.A.G. typeface. I've used it extensively in the 90's for its proper use, making signs for Volkswagen dealers, but would never use it again I suppose. Keep up making videos, all the best.
The colour corrector may come in handy for transferring analog video to digital. So it may get some use.
You are the first one commenting on the VAG font I use these days. I use it not because of its connection to Volkswagen, but because it is somewhat close to the font the German TV station ZDF used in the 80s and 90s. It's nice and simple, and looks good on video, much better than the BBC-inspired Gill Sans font I used before which is much too complex.
@@DrCassette Yes, for transferring old tapes it may certainly come in handy. That is the reason why I still have my equipment too.
I think Gill Sans is fine for screen too, but one should use a bolder variant. What makes V.A.G. ideal is the fact that it's very geometrical. I personally find it too round and makes me think of a brand for children's toys... If you allow me to suggest a - in my opinion - suitable font it would be DIN Mittelschrift. It's obviously also very German but has a more serious and scientific feeling to it. I do remember the old ZDF logo as well, and if that is just what you are looking for, ignore my opinion and happily continue making your interesting videos! Guten Abend!
Really interesting. Does it work also as a Time Base Corrector ?
No, this device does not have a time base corrector.
sony is world best in electronics,,,
..was, it was!
@@lucid272 , not was..its forever. amount of electronic devices they have been making since beginning is beyond count.you think apple? samsung?.im laughing