Overfill; Overfilled Image - Christie CP2210 Service Manual

Appendix B: Overfill
B.1 Overfill
on the wall or area being projected onto.
Overfill is the size of the light path from the IOS compared to the DMD active mirror array. The goal is
to have approximately 5-10 pixels of overfill on each side (maximum 15 pixels). Overfill is caused by
the light path being magnified too much by the lenses in the IOS. This is not visible on the projection-
screen because the DMD aperture absorbs the light causing the DMD to heat up. NOTE: The
following procedure must be completed every time the integrator is replaced. For details, refer to
5.6.10 Integrator Assembly, on page
B.1.1 Overfilled Image
WARNING! Overfill should be adjusted to a maximum of 15 pixels on each side.
If there is no shadow on the
wall the amount of overfill
will need to be measured to
ensure that the DMDs are
not overheated.
1. Using the vertical
adjustment screw on
the fold mirror adjust
the image until a
defined edge of the
integrator output beam
(at the bottom of the
light footprint) is
aligned with the
horizontal black line
on the test pattern.
NOTE: The line may
be difficult to see after
this step is completed.
2. Turn the screw on the
fold mirror 1/4" of a
turn clockwise.
3. Use a ruler to measure how many centimeters the light beam moved (measure the distance from
where the line was in Step 1 to where the line is in Step 2). See Figure B-1. This measurement
indicates how many centimeters the light moves with every 1/4" turn.
4. Turn the screws on the fold mirror to re-adjust the integrator down until there is no more visible
shadow at the bottom of the image.
CP2210 Service Manual
020-100556-04 Rev. 1 (01-2012)
DO NOT look directly into the projector. This procedure must be viewed
5-46.
Figure B-1 Measuring Overfill
B-1