Adjust the Image
CP42LH Service Manual
37
020-101686-03 Rev. 1 (08-2016)
c. Green and blue must always be perfectly aligned to each-other (to within 1/4 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 causes 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 fine.
b. To “Split the difference” push the rest of the image slightly twisted counter-clockwise to
minimize the effect on the bottom of the screen, keep 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.
Obtain the white point and brightness
Create a white point laser setting file for 3D and 2D channels. You may also need to create one for
scope and flat features.
1. In the laser bank control application under Screens, click System.
2. Under Color Levels, move the System Green control (CTL) slider to 100%.
3. Wait approximately 30 seconds for the green lasers to respond.
Every time you adjust the green lasers, wait for the lasers to move to the new value.
4. Using a spectroradiometer, such as Photo Research PR-655 SpectraScan® measure the
brightness and color of the screen.
