First question, where did you get this monitor?? Is it fro ALS- is so, you are in for a lot of problems, wrong tube, wrong yoke.....
Please check the part number and manufacturer of the tube shoud be A63...
Check the Yoke DAJ....
Now if possible post the picture of the chassis, should be a CH288 switchable.
What resolution, Standard or Mid res are you using?
I use the same board in some of our monitors and know it very well. Good board, but we add numerous mods to improve it.
Worst case I can sell youa brand new board.
Rick Nieman
Nieman Video Displays
Rick@Niemandisplays.com