Keep going until you have a range of positions (probably less than half a turn) where the boot is best. Once you have found the position where boot will not happen, go the other way and find the other 'no go' end of the range. See how good the 'boot' is.Įject the disc, remove the cover and move the screw clockwise a little. Put the drive's cover back on, no need to fit the screws, a small coffee mug stood on top will suffice. Tightened up so that the sled cannot move.) (This 'play' is deliberate, the screw must NOT be You can feel how 'loose' the screw setting is by holding that side of the sled and seeing how much play there is. Put a tiny drop of white correction fluid (or similar) on the screw to keep track of its position. Don't look into the laser lens, infra red is invisible and can cause retinal damage (it's probably safer to switch off when the cover is off the drive). Proceed as follows, with the PS2 already open - at your own risk of course:Ĭarefully remove the top of the CR-ROM drive, four small screws. Now that we are using CD-R and DVD-R, this adjustment is much more critical. When Sony set the machine up originally, the setting was probably made with a 'standard' DVD because this (and CD) was all the machine was ever going to play. DVD-R is most critical due to its much shorter wavelength. However, DVD-Rs and CD-Rs exhibit a very different range of adjustment. Experiment shows that the potential range of adjustment is very large normal CDs and DVDs will read reliably over several turns of this screw. The azimuth adjuster screw - the one on the left side of the assembly) will tilt the assembly slightly by lifting one side off its rail. The laser assembly is mounted on a sled which runs on two round steel runners.

With DVD there are four diodes that examine the pahse difference of the reflected light so that much tighter adjustment can be made as the groove is followed.

With CDs it is far less critical and a single collecting diode is used to measure this deviation. So the laser 'floats' - that is to say as it follows the minutely wobbling and pitching groove, it reads the reflected light coming back, merging part of it with it's own beam and measuring the phase difference, the result being applied to an algorithm that tells the laser to adjust in either plane. The deviation will always be more than a DVD wavelength. No CD/DVD is manufactured so that the centre hole is exactly in the centre and that the CD/VD is exactly flat. The light wavelengths involved with CD/DVD are in nano-metres.

Cd rom reader lens part