Does anyone really Know

[Adders]

Hello there
Can anyone please help me.
Is there a site that gives technical info on calibrating lasers on a Version 7 PS2 39003.

I have a scope and all the tools.

I tried setting the pots with a multimeter and found this worked perfect, all my backup discs DVD+r & CDr played perfect.
I went through my entire collection one by one they all worked.

Came home from work and found some games would not work again. The PS2 is ony a few weeks old and the laser is not dirty.

Any Ideas

PS I have a PS2 PAL 39009 and have fitted a magic 2 mod.
I use a sony DVD+r/DVD+RW

Thanks Adders