Microsoft Xbox Repair Manual page 31

Next we remove the four screws circled in green above. These are in there tight, it is ESSENTIAL
to use a good Phillips #0 screw driver and use plenty of down force to see that they do not strip
out (if a cheap or well used screw driver is used with not enough down force it is likely to skip
and hole out the inside of the screw where the driver grips, so use a good driver and be careful).
Also if you lose one if these screws you will have a terrible time finding a replacement so think
about working on a flat surface and have a magnet or something to put them on. (They get lost in
carpets instantly)
Note: when the tray is opened the laser is not meant to move freely along the rails if you slide it
back and fourth you will hear a gears grinding awful sound, it is actually a little wheel with slots
in it, part of an optical motion sensing system for the laser position. Regardless this is normal and
you shouldn't get too worried. Try not to slide it around too much.
Now that the screws have been removed, take out the upper rail in this photo. There is still a gear
that is holding the laser in place so it cannot be lifted straight up, 1 raise the laser slightly and then
2 move it away from the bottom rail and it should come right out.
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