[Niels Nielsen]

Sitting here with my 3 manuals, and a lot of kind peoples advice I have adjusted patterns and image on, more or less, the center of the tube faces. This required I lifted the projector 2 cm more from the floor, so that the green hatch came in the center of the screen.

Went through a rough alignment again, and re-located the blue and red gun so that their hatch matched the green and everything was fine.

Checking the red focus though yielded trouble, it is impossible to get it focused in the corners, and its quite a large area we talk about here. Green and blue are fine. If one side is more or less in focus the other side is way off, and flapping cant fix it.

Can it be that I should lower it the 2 cm. again ?

 

[techman707]

Did you properly center the Red and Blue rasters BEFORE you adjusted the "toe-in" of the red and Blue tubes? If it wasn't for the hours on your unit I would say it's the tubes, but, either your rasters are "too large", which can affect corner focus, or you're just not getting the flapping right.


Look at the center and edge focus knobs on the lenses, they should be in the same position as the other two, if not, something is wrong.

 

[Niels Nielsen]

Thanks. Well, I moved it back where it was and stopped "obsessing". Anyway, I am totally at a loss here : using Guy´s directions, putting the test pattern in the middle of the tube, and measuring that the projector is square to the screen, then the green doesnt match up to screen center vertically !! Getting the patterns centered is a bit of a guessing game also I think....

I have read Guy´s manual 100 times and I just dont get it, better leave it then...

 

[techman707]

It's not guessing to get the rasters centered. You should enlarge the rasters horizontally and vertically to their "maximum" size then look into the lens and it should be very easy to see if it's centered. NOTE: On the D50, when you hit 126 on the horizontal and vertical setting, in order to make the raster larger, you need to increase it "one click at a time" until it says "MAX", which is right after 254.