Christie DLV1280 DX User Manual page 11

INSTALLATION AND SETUP
Vertical & Horizontal
Position
2-8
DLV1280 DX User's Manual
Throw distance is roughly equal
to the horizontal width of the
screen multiplied by the type of
lens you are using. For example,
if you are using a 1.2:1 lens,
proper throw distance will be
x
approximately 1.2
width. Once you know your
screen size and lens, you can
estimate throw distance needed
(see example in Figure 2.8).
IMPORTANT:
For proper
placement in an installation,
always refer to the throw distance formula and/or graph for your lens type as listed
in Appendix E. Keep in mind that due to lens manufacturing tolerances for lens
focal length, actual throw distance can vary ±5% or more between lenses described
as having the same throw ratio.
'
THE VERTICAL AND HORIZONTAL POSITION
also depends on the size of the screen and the lens type. Correct position helps ensure
that images will be rectangular in shape rather than keystoned (having non-parallel
sides) and that image focus and brightness both remain optimized. Ideally, the
lens should be centered with the screen.
DLV1280 DX
If necessary, the image can then be manually offset—that is, moved up/down or
left/right—by making a slight mechanical adjustment to the lens mount (essentially
repositioning the lens within the projector).
To offset the image (Figure 2.9):
1. Center the lens with the screen as well as possible—refer to dimensions on
page 5-3 if necessary. To shift image position slightly, continue with the
remaining steps.
2. Remove the front bezel (6 screws).
3. Loosen 4 mounting screws (½ turn only) around the front perimeter of the lens
mount. Do not loosen more than ½ turn, or you will create too much "play".
4. With a flat screwdriver, pry in the adjustment slots as necessary to slide the
lens mount in the direction desired (maximum amount of movement in any
direction is approximately 1/8").
•
To move the image up or down, pry at side slots (gives ±70 pixels
movement maximum).
•
To move left or right, pry at the top slot (gives ±50 pixels movement
maximum)
5. When the image is correctly positioned, secure the 4 mounting screws (15-18
in.lb.) and replace the front bezel.
the screen
Figure 2.8. Estimating Throw Distance
WARNING
Qualified service technician required.
(SEE APPENDIX E)
of the projector in relation to the screen