From age 14 to 31 I worked for my uncle who had a coin-op business from what I recall the Dragon's Lair arcade game used the CED but it may have been a Video Laser Disc player I can't remember but I do know the thing was huge and never worked.
Wikipedia devotes quite a bit to the problems in keeping the games running: https://en.wikipedia.org/wiki/Dragon's_Lair e.g.:
"The life of the original player's gas laser was about 650 hours; although later models had solid state lasers with an estimated life of 50,000 hours, the spindle motor typically failed long before that."