Microsoft Xbox Repair Manual page 40

Now the laser assembly is exposed from the bottom of the drive.
As well as the top
If you wanted to try cleaning the lens and mirror this would be as far as you need to go. Blast the
optics with compressed air attempting to direct the dust away from the lens (top) and mirror
(bottom) Use a clean Q-tip and lens cleaner to clean the optics, you want to achieve a streak free
surface.
The next step is to dislodge four dampeners that hold the laser assembly in place
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