Thanks for the info. I am going to try this first on a laserdisc that is otherwise unusable, so it would be nice to bring it back.
The laserdisc is also warped (down) from sitting too long, I guess. Has anyone tried to bake a laserdisc (heat it up) in an effort to let it relax some and straighten out? I am thinking if I lay it upside (compared to the warp) in the oven that it might soften enough to relax. I would start at something like 110 degrees.
Scott C.
For fixing warped laser disc try this
re: The care and feeding of laser videodiscs Revised: 28 Jul 90
Part 2 of 3: Correcting warps.
re: > .. laserdisc, only it's warped to the extent that my player produces
> video noise when the head is in the outer sections of the disc. I
> would like to fix the warp myself rather than returning it. What's
> the fix for a warped disc,
0. Read these instructions and have all materials handy.
1. Obtain two sheets of optically flat glass, at least 12x12-inches.
1/4-inch plate is ideal, but ordinary window glass will do. Clean them
and place them in an ordinary oven at the lowest possible setting.
2. Select the most wrinkle-free LD inner sleeve from your collection. A
3M-style lined paper type with center hole is ideal. Place the sleeve in
a warm place, like in the sun.
3. Using a soft, slightly damp, lint-free cloth, wipe all debris from the
disc. Wipe radially, from the inside out.
4. Warm the disc up to about 100 degrees F. Playing it for two hours will
accomplish this, but only if, a: the disc is still flat enough to play
without striking player parts and, b: it will actually play, rather than
being rejected by the player.
If the disc cannot be played for two hours, fill a sink full of water at
100F. Insert the disc in a jumbo size zip-lock bag and insert it in the
water up to, but not beyond, the zip closure. Keep it there for five
minutes, dipping up and down to circulate the water. When removing it
from the bag, take care to keep it dry.
5. Quickly insert the disc in the warm wrinkle-free sleeve and place the
sleeve/disc between the warm sheets of glass. Place the sandwich on a
towel on a firm flat surface. Stack a pile of books on top (about 10
pounds). Make sure the bottom book is close to 12x12 itself. Place the
stack away from sources of heat and leave it that way for two days.
6. If that fails, replace the book stack with a large pan or pot full of
water at 100F. Select a vessel with a flat bottom. If no joy, work up
five degrees at a time to higher temperatures, but don't exceed 140F.
> ...and is the fix permanent, or will it slowly return to being warped?
If the disc is a 3M (Imation) casting, made by the non-thermal "2P"
photo-polymer process, it probably will not re-warp. For all other brands...
It depends on why it warped in the first place. If it warped due to
"trauma", such as over-tight shrink-wrap or exposure to bending stress under
high temperature, it may remain flat. On the other hand, if it warped due
to release of inherent manufacturing stresses, then it may very well re-warp
when warmed up by your player. If you have an old gas-tube laser player,
the disc will experience more heat than with a contemporary solid-state
laser player, and will be more likely to re-warp.
If the disc has "cone" warp, and you have a two-sided player, always playing
it in the "cone edge up" configuration may prevent re-warp. Any tendency to
sag should cause the disc to resume being flat.
Disclaimer: Although I have a couple of discs with "cone" warp, I haven't
needed or tried the above techniques personally. These suggestions are
supplied without warranty of any kind. Your disc will probably melt and
catch fire. I would consult other sources before trying anything.
Batteries not included. Your mileage may vary. Simulated TV picture.
This info was taken from this web page
http://www.access-one.com/rjn/laser/legacy/ld13.txt