Just as a matter of record, its worth publishing the proceedure for this...
To centre the scanners in x and y axis
1/ with power to the projector off disconnect the x & y signal inputs to the scanner drivers.
2/ loosen the bolts in the scanblock that pinch the housing around the scanner - do this for whichever axis needs adjustment - the scanner should move smoothly & easily but not be too sloppy in the mount. For DT scanners a 3mm allen key will be needed.
3/ power up the projector - the scanners will find thier 'home' centred position
4/ output some content at low power so the laser(s) light up
5/ gently rotate the scanner - avoiding touching the electrical connections on the pcb - until the beam is exiting square to the case in the required axis
6/hold the scanner while tightening up the bolt
7/power off and re-connect the signal inputs
Done!
Rob