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edp2000
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Post subject: Re: anybody have issues with warped discs Posted: 17 Aug 2018, 05:11 |
Third post and above |
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Joined: 12 Jan 2018, 05:14 Posts: 4 Location: United States Has thanked: 1 time Been thanked: 0 time
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I had just received my "Big Girls Don't Cry... They Get Even" laserdisc in the mail today, and upon watching it, I had discovered that the disc was warped. The warping seems to show at the 41 minute mark on side 1, and 43 minutes in, the digital audio starts to pop and click. But the analog stereo track seems to be intact. The same thing on side 2 in the last 20 minutes also, but not as bad. The disc hasn't locked, which I'm thankful for at least. Overall, the disc is still watchable, but the warped picture can be very distracting.
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muzer
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Post subject: Re: anybody have issues with warped discs Posted: 11 Jan 2020, 00:04 |
Serious fan |
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Joined: 02 Sep 2015, 00:03 Posts: 173 Location: United Kingdom Has thanked: 3 times Been thanked: 24 times
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On going through my collection i've found that Disc 1 of Midnight Cowboy (a Criterion CAV version) has a problem which I believe to be warping. Side A plays fine but Side B has severe video and audio problems seemingly throughout— but this is regardless of which way around I insert the disc, ie side 1 plays fine but not side 2 if I insert the disc normally, and side 2 plays fine but not side 1 if I insert it upside down.
The exact nature of the problem is that the bottom fifth-to-half of the picture is distorted and wobbly, with the colours also being wrong. The digital audio also sounds bad; dropping out frequently. There are no actual picture drop-outs however. The player also locks and skips a lot, and has trouble seeking. Finally, if I switch to side B from side A sometimes the player will give up completely and quite abruptly, which makes me wonder if the disc was actually hitting something and this was being detected somehow. The disc didn't physically look very warped at all but I thought this is likely the problem, so I've currently got it squashed, in its inner sleeve, between a table and a metal board with loads of books piled on top. I'm going to hope this suffices to undo the warping, even though it's not very warm at the moment — maybe I'll try and move the whole lot to near a radiator if this doesn't work?
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rein-o
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Post subject: Re: anybody have issues with warped discs Posted: 12 Jan 2020, 00:53 |
Jedi Master |
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Joined: 03 May 2004, 19:05 Posts: 8108 Location: Dullaware Has thanked: 1221 times Been thanked: 846 times
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muzer wrote: After having another look at the disc this doesn't actually seem to be warping at all. I've noticed now that the top and bottom halves have actually "slipped" in relation to each other!!! That is, there's a "ridge" of maybe half a millimetre between one and the other on the inner hole. So this explains why my player can play "side A" perfectly fine (it must be aligning itself with the bottom disc and not the top one), and also why the player has such difficulty tracking "side B"!
Any ideas of how to fix this or should I write off this disc?
My idea: Heat the disc, and apply outward pressure (using some sort of inverse-clamp, which I assume must exist?) on the inner hole where the misalignment is worst. I won't try it until I hear back from others on this forum of course! That sounds like it would mess it up more, but since the title isn't rare or that expensive you could try. But before you try anything can you post a picture, is the inner ring hole off???
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muzer
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Post subject: Re: anybody have issues with warped discs Posted: 12 Jan 2020, 01:05 |
Serious fan |
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Joined: 02 Sep 2015, 00:03 Posts: 173 Location: United Kingdom Has thanked: 3 times Been thanked: 24 times
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Will do. I definitely wasn't going to try anything without advice! It's the Criterion version though it's still listed for not too much money on LDDB; I can always buy another. It's one of the 3M pressings with the super sticky glue so I imagine this is what made it more prone to this strange slippage than a normal disc would be. I'll post a photo — it's a subtle but unmistakeable misalignment of the two halves. It's of course tempting to just leave it as it's still playable right now, just not using both sides play. EDIT: photos here: http://tim32.org/~muzer/mc-slip . It's much harder to see in the photos than it is in person.
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jd213
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Post subject: Re: anybody have issues with warped discs Posted: 16 Jan 2020, 10:40 |
Serious fan |
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Joined: 13 Jul 2012, 10:29 Posts: 162 Location: Japan Has thanked: 28 times Been thanked: 35 times
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lizardkingjr wrote: rein-o wrote: wanted to hear what others have to say about them, if they have fixed them etc.
never had any before but i just picked up 2 and wanted to hear others stories.
1 seems to have flattened out in my shelf and plays fine so far, going to give it some more time. other gives issues at the end of the disc, last 5-10 minutes of each side. From our own publius: https://groups.google.com/d/msg/alt.vid ... WqGnO_YSQJTLK I've also been having problems with what I assume are warped discs, thankfully only a small handful at this point ( thread here). But reading the above Usenet thread, it would seem that my problems might just be a symptom of a misaligned laser? Guess I'll need to try adjusting the pots one of these days (will be sure to mark the original positions) using a test disc and maybe a scope. Anyone have recommendations for what I should look for in a scope? Was considering getting one anyway in case I need one for retro gaming hardware or my CRTs.
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rein-o
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Post subject: Re: anybody have issues with warped discs Posted: 16 Jan 2020, 16:12 |
Jedi Master |
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Joined: 03 May 2004, 19:05 Posts: 8108 Location: Dullaware Has thanked: 1221 times Been thanked: 846 times
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jd213 wrote: Guess I'll need to try adjusting the pots one of these days (will be sure to mark the original positions) using a test disc and maybe a scope. Anyone have recommendations for what I should look for in a scope? Was considering getting one anyway in case I need one for retro gaming hardware or my CRTs.
Just remember you are adjusting to play 1 or 2 junk discs and then could potentially destroy your player. Good luck.
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cplusplus
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Post subject: Re: anybody have issues with warped discs Posted: 17 Jan 2020, 04:02 |
Hardcore fan |
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Joined: 13 Aug 2018, 03:18 Posts: 1520 Has thanked: 449 times Been thanked: 588 times
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jd213 wrote: Anyone have recommendations for what I should look for in a scope? It needs to be dual-trace. I think Kurtis has recommended a TDS 210 before. I have a newer Tektronix DSO, but if you have the space for an analog one it will save you money. rein-o wrote: Just remember you are adjusting to play 1 or 2 junk discs and then could potentially destroy your player. Very much so.
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je280
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Post subject: Re: anybody have issues with warped discs Posted: 17 Jan 2020, 16:50 |
Hardcore fan |
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Joined: 13 Sep 2012, 23:14 Posts: 1199 Location: United Kingdom Has thanked: 265 times Been thanked: 259 times
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jd213 wrote: Thanks for the recommendation. Won't be doing any actual adjusting until it's much more than "1 or 2 junk discs" (actually 4 at this point) that my player can't play, but I appreciate the concern. Hi jd213, rather than adjusting what appears to be a perfectly good player would it not be better to try to flatten the discs if they are indeed warped? There are a few threads here on how others have done this. Had a few, 3 or 4-ish, very badly warped LDs years ago & using heat & pressure got them to play again, they had been poorly stored for many years before they fell into my hands. Don't overdo the heat though as some binding glue is quite soft on some LDs, the warped ones I had were a couple of PDO pressed discs & I cannot remember who pressed the other badly warped LDs. Hope you get them sorted but they may just be poor discs & adjusting your player may not help at all. Cheers .
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jd213
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Post subject: Re: anybody have issues with warped discs Posted: 20 Jan 2020, 04:53 |
Serious fan |
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Joined: 13 Jul 2012, 10:29 Posts: 162 Location: Japan Has thanked: 28 times Been thanked: 35 times
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je280 wrote: Hi jd213,
rather than adjusting what appears to be a perfectly good player would it not be better to try to flatten the discs if they are indeed warped?
That was originally the plan, but as I read through the Usenet (Google Groups) thread linked earlier, some experts seem to think that problems with warped discs is just a sign that the laser is going out of alignment. If it gets worse and my player stops playing discs, then I'll have little choice but to try adjusting the pots, as even Pioneer Japan has stopped servicing the X9. If most discs keep working, then I obviously won't need to do any adjusting. Haven't had too much luck in flattening out any warped discs though, guess I'll try leaving them between the two layers of glass +some dumbbells for a couple months instead of a couple weeks.
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je280
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Post subject: Re: anybody have issues with warped discs Posted: 20 Jan 2020, 12:05 |
Hardcore fan |
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Joined: 13 Sep 2012, 23:14 Posts: 1199 Location: United Kingdom Has thanked: 265 times Been thanked: 259 times
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jd213 wrote: je280 wrote: Hi jd213,
rather than adjusting what appears to be a perfectly good player would it not be better to try to flatten the discs if they are indeed warped?
That was originally the plan, but as I read through the Usenet (Google Groups) thread linked earlier, some experts seem to think that problems with warped discs is just a sign that the laser is going out of alignment. If it gets worse and my player stops playing discs, then I'll have little choice but to try adjusting the pots, as even Pioneer Japan has stopped servicing the X9. If most discs keep working, then I obviously won't need to do any adjusting. Haven't had too much luck in flattening out any warped discs though, guess I'll try leaving them between the two layers of glass +some dumbbells for a couple months instead of a couple weeks. I had got very badly warped discs flattened enough to play years ago but it did take time, had a couple between fairly thick glass sheets for around six months or so. They were lightly heated & the glass was also lightly heated before pressing the discs. The only reason for the heat thing was they were severely warped due to poor storage for many years before I got them, still got a one of them & it was playing well the last time I popped it into the player. Good luck. Cheers .
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