Warped Laserdisc - how do I fix?

[Bob Niland]

re: > on 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,

Dimly recalled instructions...

1. Place the clean naked disc between two very clean sheets of glass, each
at least 12x12 inches in size, and 1/4-inch plate if you can find some.
Place the sandwich on a firm flat surface. Stack a pile of books on top,
with a large "coffee table" book on the bottom. Leave it that way for
two weeks.

2. If that doesn't do it, place the sandwich in a conventional (thermal,
not microwave) oven, place heavy and uncookable objects (like bricks)
on top, and bake at 120 degrees F for 4 hours. If this doesn't help,
work up slowly to higher temperatures.

> ...and is the fix permanent, or will it slowly return to being warped?

That 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.

Disclaimer: Although I have a couple of discs with "dish" 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 wait 7 days for further net input before trying
anything. Batteries not included. Your mileage may vary. Simulated TV
picture.

Regards, Hewlett-Packard
Bob Niland rjn%hpf...@hplabs.HP.COM 3404 East Harmony Road
UUCP: [hplabs|hpfcse]!hpfcla!rjn Ft Collins CO 80525-9599