During laser repair/replacement the attention has to be paid on laser flex/ribbon cable which has to go under the arm for tension springs. It seems it is not needed but when you put the ribbon cable above it becames too long and stops laser movement at the end of a disk.

Another cause may be a dried grease on the laser shaft

Thank you Peter for your reply. Did you get my private message?

Unfortunately, I didn't get it 😕

Piotrze, czy zajmujesz się naprawami tych sprzętów?

Jestem szczęśliwym posiadaczem BS9000 i z racji tego, że nie ma w pobliżu serwisu naprawiam sam posiłkując się instrukcją serwisową i wskazówkami z tego forum.

Wspaniały sprzęt. Pozdrawiam :)

I had the same problem with playing CDs which have more than 10 songs despite placing laser ribbon cable under the arm of tension springs. This is because that ribbon cable is a little too long and is bent in a shape of collapsed letter U and the bottom of that U, when laser moves backward, starts to touch the end of plastic chassis of laser mechanism with thick square reinforcement ( empty inside). The ribbon cable should go under that reinforcement but it can’t due to it’s shape. Theoretically we should bent that cable to achieve letter C shape instead collapsed U. In reality it is not possible because the distance between laser and sledge’s bottom is very short so by bending you may obtain U but wider. Such a wider U may go under that reinforcement but  doesn’t have to. Therefore I have dismantled whole laser mechanism, took a file and grinded that reinforcement to be curved. Then for smoothness I glued adhesive tape over that curve. Maybe it is not state of art engineering but I am not an engineer and it was only solution coming to my mind. At least long CDs are now played till their end.