If yr gonna tinker with the laser don't dive straight for adjusting the pots!!
Great results can be achieved by adjusting the white cog (or cogs depending on yr ps2 model) which brings the laser slightly closer to the disc. Too many people dive straight on the pots and blow the laser when its not necessary.
The method I use is get an original dvd, Take off the ps2 lid and the dvd drive lid but keep the white magnetic disk off of the lid handy.
Pop a dvd on the drive and put the magnetic holder on and adjust the cog/ cogs onto their lowest setting/settings.
Turn ps2 on and see if it boots, if not turn off and adjust cog/cogs two clicks up and turn on and boot again and repeat process until dvd boots.
Keep a track of the number of clicks u have made from lower most setting.
when it boots keep on going, two clicks at a time until the dvd fails to boot again, you will have a bracket of about 12 clicks where a dvd boots ok.
Now go back to the topmost click where a dvd boots and replace the dvd for a dvd-r and again adjust down 2 clicks at a time until the dvd-r boots. Keep on going after it boots and you'll get a bracket of about 6 clicks where a dvd-r boots ok. Set it into the middle of the bracket and then check that CD/CDr still boot ok at that setting. Ifd it does problem solved. If it doesn't you have 3 clicks each way to get both cdr and dvd-r to boot.
If you cant get dvd-r to boot with any adjsutment of height then its time to look at VERY MINOR adjustments to the dvd pot.
Basically make the smallest adjustment that you possibly can with an Ohmeter monitoring the pot resistance. Try not to adjust it more than 5% of the original setting. On completion of the adjustment go back the the height adjusting proceedure and start again.
Hope this helps and all of this is done at your own risk.
Regards
