Almost all laserdisc players use the 780nm semiconductor laser, the same of any compact disc player; it could be difficult to play a laserdisc through scratches.

A way to play it flawlessy (maybe) is to use a laserdisc player with a red laser; any MUSE player should be able to do it, as they have a 670nm laser.

In the rare occasion a MUSE laserdisc player can't play a scratched disc, the only way to go is to use an "ancient" player, like the Pioneer PR 7820 or LD-600, as they use the He-Ne laser tube at 628nm.

Hope this help; again, my Pioneer HLD-X9 will be "glad" to play it for you! (^^,)