Dreamcast Laser potentiometer default position

Hey guys, I need some help...
My Dreamcast plays original games very well, without any problems, but when I try a burned game, sometimes the game stars, sometimes it don't.
So I messed around with the potentiometer a bit, and the burned games started working, but it seems that original games are spinning too fast. Is it possible or it's just my impression?

Anyway, now I'm a bit afraid that my laser will burn, because I don't know the original position of the potentiometer or the original resistance with ohmmeter...

I have a PAL E Dreamcast HKT-3030 Model 1

Can someone with a Dreamcast like mine tell me the default position of the potentiometer or the original resistance with ohmmeter?

Please help me and give me some advice, because I don't want to damage my Dreamcast... :wink-new: