Christie CP4220 Instruction Sheet page 10

c. Green and Blue should always be perfectly aligned to each-other (to within ¼ pixel total in one
or a combination of directions.)
2. In certain circumstances, there may be further tolerance deficiencies in the prism assembly in
combination with the projection lens that will cause the normal Red over-sizing to become slightly
non-uniform.
a. In practice, this extra increase in size has generally appeared on the lower-right of the image,
causing an apparent clockwise twist in the lower-right corner only – the upper left, right and
lower-left all look OK.
b. The only way to deal with this will be to "Split the difference" pushing the rest of the image
slightly twisted counter-clockwise to minimize the effect on the bottom of the screen, keeping
the subtitle zone as converged as possible.
c. If the problem appears to be more than an extra 1/2 of a pixel out of uniformity, a new lens/
prism assembly may be the only solution.
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Figure 10 Best Possible Convergence
Convergence Instruction Sheet
020-100703-01 Rev. 1 (05-2011)