12. Convergence
Image 12-6
Convergence test pattern
Work Instructions:
• GREEN and RED DMD’s are to be adjusted with reference to the BLUE dmd.
• Each adjustment allows for approximately 10 pixels (fo
r 2K projectors) or 20 pixels (for 4K projectors) m axim um displacement
to either side of the nominal BLUE position
• Rotation is limited to approximately +/- 5pixels on the left screen flank and +/- 5 pixels on the right screen flank
• One turn of an adjustment screw relates to an approx. 5-pixel displacement on the screen.
• Let the projector warming up for 30 minutes, while projecting the conv ergence test pattern, before starting to adjust the conver-
gence.
Take Care:
• In rare cases it can happen that the nominal dmd position falls within a dead zone, wh ere the mechanism changes from a
pushing to a pulling function. This dead zone is due to inherent tolerances within the mec hanism . A pproxim ately 2 turns a re
required to get out of the dead zone. If it so happens that the nominal position of an adjustment falls within this dead zone,
it is preferable to c ontinue screwing through the dead zone for an other 2 turns. Then return to the required nominal position.
The dead zone should now be displaced away from the required end position. The DMD is now securely held in the nominal
position.
• Each adjustm ent is limited to approxim ately 1 0 pixels (for 2K projectors) or 20 pixels (for 4K projectors) displacement. DO NO T
try to force the adjustment beyond this point. The system has an end of travel in both directions, but with excessive force one
could cause damage.
162
R5905963 PROMETHEUS SERIES 09/03/2015
To Next Page
Loading...
Need help?
General
