Glass LaserDisc Master & Zenith LDP510 Player Repair
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- čas přidán 14. 07. 2018
- Today is a bit of a journey into a stylish Zenith LDP510 Player from 1991 plus an experiment: Can a glass laserdisc master be played on a traditional laserdisc player? Join me for the answer and tips to repairing this rare-ish Zenith. Plus see my foot/sock if you look closely! (LOL!)
- Věda a technologie
That glass disc is soo cool! would look awesome framed next to a magnetic core memory stack
Even still, I think you'd need some sort of reflective layer to bounce the read bits back.
Won't it not play because it's effectively a negative?
You need to be a bit more positive Andrew, ;P.
It is a master, so was used to make a metal mother to stamp the real disk. Effectively it is a laserdisc, but as it has no aluminium coating sputtered on the surface ( it was photochemically etched to get depth in the glass coating) the laser cannot read it properly. You would need to space the disc off the platter slightly, as the laser unit itself cannot focus on what is effectively the surface of the disk, but is set to focus on the reflective layer inside the stamped disk, seeing through the flat surface. Thus if you space it 1mm high off the platter it might get a focus on the surface, start to run the motor and run the disk up to speed, then attempt the TOC read. You can see the unit stop at points during start to see if it can detect a disk, trying first at laserdisk outer, then smaller diameter for CD/DVD, then finally for minidisk, then after deciding size it moves to the rough position of the leads in and then tries to read a the preamble to get a good data stream. It goes too far in, so it is thinking the disk is a mini CD and not a laserdisk.
It being a negative shouldn't matter too much, as what the laser reads is pretty much the spacing between pits and the reflective surface.
It's an oversimplification but that's how it works.
What's happening here is that the laser just can't get the focus right, and that the reflective surface is not on the same plane as those pits.
Yeah. You need to reverse the dirrection of the motor to read the negative.
And of course, make the glass reflective somehow (spray something on it ? don't know)
Thank you! You covered it.
I like how you work on the floor... I too work on the floor. Don't think it's strange at all; I felt right when I met a popular engineer in Los Angeles, and his desks were full so he was working on the floor. Just like us! :)
I wonder if the glass is too heavy for the motor to spin it up. It seems like it would try to spin up the disk when it goes into seek mode.
It's way too heavy; the motor in most LD players were so puny that they could just barely play a regular 12" LD...
That's crap, maybe in some older ones, but not most. Any 'Both Side Play' player can stop the rotation of the 12" disc, and reverse in a very respectable amount of time.
Also, LD players don't need to spin the disc to try to read it, it looks for reflectivity first. You can see this in this video when he puts in the CD and smaller LD. If it determines there's no reflectivity at outer edge where a laserdisc would go, it tries again closer to the center to see if it's a compact disc. This saves time.
It is a negative flash disc. A high powered xenon arc lamp makes copies flash burning the foil layer in the copies. If he had an old 1 sided laser disc and an arc light and a big lens he could burn the blank side of a disc .some laser disc movies were on 2 or more discs and sometimes the last disc was only flashed on one side.
that glass disc would make a great wall clock.
13:03 That’s some rare footage. If you look, that’s actually the Challenger.
My life HAS changed after watching this.
Now how do I change it back?
id104335409 flip the disc back again.
Play the disc in reverse!
Knuckles the Echidna Lol I see you commenting on beno lifts video
I'm happy when the notification appears on my screen, but at the same time a bit sad because I can not have this beauty in my hands ... But i love your videos, as always, thanks so much for posting them ^^
I'm sorry you are a bit sad. Hopefully the video was therapy for you. :)
it was, certainly, I love the whole video, that's why I keep watching your channel, it's so good and relaxing, and at the same time exciting, because more and more you bring these old but amazing wonders ^^ thank you very much again ^^
Make an epoxy copy from that master. And cover one side with a chemical mirror treatment, that might work.
Exactly. a prototyper youtuber channel should be able to help.....
Yup ! And one big bright flash of light later wala a perfect copy first generation home made laser disc.
I think the bracket that you showed at the end that is designed to push back and lock in the laser cartridge so that the micro switch detects it is in a safe position to eject the disc drawer is in the wrong position. This probably occurred when that _someone_ you spoke of just slammed the drawer back in at some stage. I think if you found a drawing on the mechanics of that model on the web then it may be salvageable as a full working player, which would be fantastic!
I always love your new videos! Thank you for your wonderfully strange experiment videos.
I'm a mad scientist!!! haha
5:34 Nice fan-lamp you have in there .
What movie was this? we want to check our collection to see if you have the master that made our disc???
Cape Girardeau - close to home!
On the Space Archive disc, was that the rollout of the Shuttle Challenger (13:00)?
I was just wondering if some of the problems with the unit were related to the crack in the black plastic linear toothed rail next to the white clip and the metal part you had moved. 14:35
The disc wasn't spinning, that might be a part of the problem!
agreed
If it did play I guess, since the whole signal would be reversed (because the master would need to be reversed to work as a mold) and therefore the video would be inverted upside down? But it would still play forwards since the frames would still be in order center to edge. And the sound would play forward in genefal but backwards for each frame.
The result would probably be even more garbled since the synch signals telling the tv where frames and lines start and end would also be reversed.
Again... That's my guess but it's hard to verify since the player expects the reflectivity to be completely different than what is present on that master glass disc.
I don't think I ever seen a Zenith LD player!
this modifications reminds me how chinese students from Australian university made a "petabyte DVD", still no one knows if that was the scam or not, but they do not released any detailed info except the way to make a nano-scale laser, everything other was the mod of ordinary drive, it was in the news many years ago already
I am guessing the glass master disc was not meant to be played but was just used as a mold to press plastic discs. This was a great demonstration because it shows why it needs the mirror surface. Thanks for making a very enjoyable video !
Electronics Instructor It definitely couldn’t be played. The glass master is used to make metal “stampers” which then are used to press the plastic discs. Those are then sputtered with metal to provide the reflective surface.
Oh shit Cape Girardeau. I used to live there!
This would actually be fairly dangerous if it worked when you think about it. I wouldn't want that glass breaking on me at those RPMs.
What if you try to transfer it to plastic sheet? Then it is positive.
Would make a good replacement microwave plate
Try to make a disk with the master
will it play a dvd?
I noticed that it tilts when it's pushed up.
Those are the types of windows I use on my walls
I suppose you could try using a hole saw to enlarge the hole to the proper size so that it would fit on the spindle and spray painting the back side with highly reflective, silver paint. A galium coat might do better. Even if you got the player to recognize the disc, it would be too heavy for the motor to spin. The platter is a stamper to make a laser disc so it's a negative anyway.
Actually its a positive. A silver stamper was made from these.
Doesn’t it need a reflective background right behind the markings to read it?
That’s probably the problem.
it also wasnt spinning up
Wouldn't the radiation of the laser shine through the glass causing blindness like so many CD and DVD/BLU players warn about? I know it is a analog laser so it could be harmless as opposed to it's digital counterpart
Unless it's a very powerful laser or you're extremely close to the lens, by the time the laser hits your eyes the little power it may have due to it being extremely out of focus, it shouldn't cause any damage, CD players I think use IR lasers though, so you may want to have that in mind.
That being said, if you can actually see the laser light (like in DVD and BluRay) without even trying, I would stay out of the line of sight of the laser.
It is the 1980's... I don't even think electricity itself was that powerful (only a joke, only a joke)
My guess before watching the video is no, it's not playable since it has no reflective layer for the laser to bounce back to the receiver. I will reply if I was right or wrong after watching the video...
I was right.
Wow 666 views great job
Themaster disc is just too heavy & big to be even played on a modded ld player but you did atleast most restored that ld player.
Could try putting something reflective like foil directly on the back side of the glass disc. Not that I would seriously expect that to actually work, but it would have been an idea.
I tried this before making the video, the test just didn't make the cut for video. Great idea tho!
It should read fine but first it has to spin to detect a signal, it is either too heavy locking up the motor or it’s spinning underneath without noticing it .
No, optical disc drives usually start by looking for a reflection to detect the presence of a disc. Then they spin up to read the contents.
Nick Wallette some of them do give the disc a little spin first.
LD players must first determine the size of the disc to know how much power to apply to the motor, therefore, the disc remains stationary while it checks the disc.
Laserdisc players are oddballs. They look to see if there's a laserdisc, then spin if found. The reason for this is because of multiple disc sizes and torque required to spin them as well as speed. A CD is light and spins slow in comparison to a heavy 12 inch laserdisc. The only exception is CDV, where it spins a CD size disc at the same rate as a Laserdisc. It's frightening how fast CDV spins.
Without any kind of reflection this can't work. And puts a reflector in the back will not work either, because the laser is traveling much too far to the glass and every reflection results in pure crap. and as the pits and dots are so near together (in height) and the glass is so thick, it's impossible for the laser to distinguish between high and low signals.
Nice find, but there was never a huge chance to get it running.
Think about the weight and mass of the master and try to image the needed force, to bringt it up to 1500 or 1800 rpm. impossible.
do you know what is on that master? not knowing is going to haunt me!!!
I've had several people ask, maybe the numbers off the center could lead to answers..
Will it brake? That is the question...
Just found this same player for 10$
I just don't see the point of this video. I don't know much about lasers disc but even I know it as too spin plus the disc is made out of glass so it's not going to see the disc.
How is it to read anything when the dang disc isn't spinning?
chadergeist82 An optical drive looks for a disc (optically) BEFORE attempting to spin up the disc. If it sees no disc, it won’t spin.
2:14 Oh god I can’t look
I blame Thor
It’s too heavy, you need to spin it.
I doubt that disc is a laserdisc master. It is clearly designed for the laser to shine through the disc and be detected on the other side.
Ryan Patterson What makes you think that?? Optical discs begin with a glass master, which is used to make metal stampers which are used to press the plastic discs.
Ryan Patterson Moreover, optical disc reading is based on destructive interference due to the pit depth being 1/4 the wavelength of the laser light. There’s no difference in transparency, so shining a laser through would not enable the disc to be read.
click bait video
John Senchak / Internet & Network Security
How is this clickbait? He tries to play the glass LD and it doesn't work, then moves onto the repair of the player. The title couldn't possibly be any clearer lol
Clickbait? How? he had a Glass Laserdisc master and he showed it off and even tryed to play it then fixes the poor zenith LD player which seems to have had a rough life.... shit i was just baited into replying to this guy LOL
I thought at first that it was quite click baity with all the playing of a standard CD first and was wondering if the Glass Master was going to be attempted. But then it did.. and he answered the question in the video. And then I realised that the reason he done all those tests before hand was to make sure it worked. No point trying to play a disc on broken hardware.
I stopped watching after the glass laserdisc as that was the part I was interested in.
If it was real click bait he wouldnt have shown the test until nearer the end?