I just purchased an old Proxima DP9200 projector and it had a very bad double image. I have aligned all three images and it is much better but it still has a slight double image shadow effect. When I cover the blue and red screens so only the green is being projected I still get the shadow. Any suggestions? The green screen has no horizontal or vertical adjustments only closer or farther away from the light source for focus and moving it either way has no effect on the shadow.