First about calibration I think it just possible with osciloscope, right?
Second hou can I get the right position of the lens, if I have the azimuth screw in the lens and two white wheels one for each support of the lens'kart?
My lens is completly desaligned.

Hi, I don't currently own an osciloscope, however aligning the laser pick up is straight forward.

The 2 white cogs get dropped to their lowest position. Collect a CD, a PS1 game, PS2 blue disc, PS2 DVDrom disc and a standard DVD. Start by putting a CD in, turn the cogs a touch until they pick up the CD. Once the CD has been picked up, then move on to the DVD. I know some people suggest going in sequence, but if the easier disc (CD) gets picked up then there's no point with PS1 games and it will read anyway and if you move directly to DVD, which is the hardest, then everything in between normally reads anyway.

It is a bit fiddly without an osciloscope, but I have repaired and aligned roughly 80% of the Sony PS2 units I was recently given using this method, including the SCPH-50004. I hate the two cog version as it is a lot harder (twice as hard effectively), but once you get the hang of it it's rather rewarding.

I really MUST buy an osciloscope however as I am certain I could repair atleast another 10%! I am always amazed by how many apparent 'laser faults', which come to me are actually something else. The disc error messages don't end up being terribly fatal in the majority of cases and I tend to think that Sony got a bit of a raw deal when it came to this.

Ultimately I think the set-up is fragile and prone to problems, but rarely is it a blown or dead laser. The new PS2 on the other hand.....

Hi,
I have a Disc Error Message with my PS2 V9 (SCHP 50004), But I have not found a way to repair it with an oscilloscope.
Where can I find a guide telling me with this version where to find the test point and the procedure to repair it ?
Thanks you for any answer !