I recently picked up a used 20000 and am having a focus problem with it. The focus problem is linear top to bottom or bottom to top depending on which area I focus on. I have found that by focusing on the middle of the picture the top and bottom are only slightly defocused, which I can live with. However, it certainly makes sense to spend some money on a fix if it is possible as the picture this thing puts out is fantastic.
Some possible settings that could be affecting this problem are the following:
1. The lens vertical shift is set right in the middle with the projector lens in just about the middle of the screen. Curiously, the manual says this is the highest setting even though the diagram shows the picture being projected equally above and below the lens. When I raise the picture to max using the lens shift dial the bottom of the picture comes in at about the middle of the screen.
2. The picture is zoomed out to around 85-90%. The manual says range is 14'3" for minimum with about 19'8" for max. The projector lens sits at about 14'6" thus the high zoom %.
3. When I shift focus to top of screen and display the menu some projector text at the bottom develops a pretty dramatic gray ghost of the text or what you might call left offset gray text.
I love this projector and would like to fix this. Any suggestions would be appreciated.