I also have a nec xg751 and It drifts constantly Temp, has alot to do with the drift. what projector do you have?
CRT front projectors
I own an NEC front projector.I have the service manuel and the service remote.While I concider myself to be a pro installer of my own video room,I can't tweak my own projector.Is there a book to teach me how to do this.I have messed the picture up before and need help.I am tired of hiring someone to calibrate and correct drifting problems.Help,help,help!