Mechanically Adjusting Dmd Convergence - Christie Cinema 4K-RGB Service Manual

Mechanically adjusting DMD convergence

A convergence problem can be identified when one or more projected colors (red, green, and blue)
appears misaligned when examined with a convergence test pattern.
The three colors should overlap to form pure white lines throughout the image and one or more poorly
converged individual colors may appear adjacent to some or all of the lines.
When adjusting the convergence, you are adjusting red and green to blue.
If you wear glasses with corrective lenses when performing this adjustment, ensure you are viewing the
test pattern on a straight angle through the optical axis of your glasses and not from a tilted or angled
perspective. This avoids a prismatic effect that can appear to shift convergence when viewing at an
angle.
1. Before adjusting DMD convergence, make sure the projector has reached a steady operational
state.
If switching from a white or bright test pattern to a dark convergence test pattern or if
warming up the projector after a shutdown, allow 15 minutes for stabilization so the optics can
reach a steady state.
2. Make sure the electronic convergence (ECC) is defaulted before doing mechanical convergence.
3. In the right toolbar, select Test Patterns.
4. Select the RGB-4K-Convergence test pattern and display it full screen.
Make sure the Uncorrected Color Box option is selected.
5. Open the Service door on the side of the projector.
6. To adjust the convergence knobs, use the 3 mm driver included with the projector.
If adjusting by hand without using the tool, pull out the convergence adjustment knobs to
engage them.
Cinema 4K-RGB Service Guide–CP4315-RGB, CP4320-RGB, CP4325-RGB, CP4330-RGB
020-102713-06 Rev. 1 (08-2022)
Copyright © 2022 Christie Digital Systems USA, Inc. All rights reserved.
If printed, please recycle this document after use.
Service setups
25