When you get No Disc, it normally occurs for one of two reasons. Either dust has built up on the lens of the laser mechanism, or the operating voltage of the laser has drifted off slightly due to heat and age. Of course, occasionally there are actual failures of components, which cause this, but these are the main two reasons.
Tools required by this guide are (not all are required for all parts however):
1) A normal sizes star (Phillips) screwdriver.
2) A very small Phillips screwdriver.
3) A small, flat screwdriver.
4) Some isopropanol alcohol (IPA)
5) A few cotton buds
6) A little mechanical grease. (I've used Vaseline before)
7) A can of compressed air.
8) An oscilloscope.
Cleaning the laser lens
1) Remove any CDs from the unit and unplug all leads and memory cards. Turn the unit upside down and use the small, flat screwdriver to pop out all the little plastic and rubber screw covers.
2) Take your normal sized Phillips screwdriver and unscrew all the screws.
After removing them the step is to clean the laser lens
Take a cotton bud and careful place some of the alcohol on it (but not so much that it is dripping everywhere). This alcohol is the same (or similar) to the small bottle of alcohol which is in audio and video cassette cleaning kits. This is probably the best way to locate a source. Locate the lens (the circular glass part) and very gently rub the cotton bud around the lens in circular motions for about 30 seconds, being very gentle. Once done, flip the cotton bud over and dry the lens with the other end for about 10 seconds.
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