4-4
D4K35 Setup Guide
020-100855-02 Rev. 1 (09-2014)
Section 4: Adjust the Image
4.7
Adjust Top and Bottom Boresight
1. Focus the image at the top edge of the screen.
2. Loosen the vertical hold screw.
3. Extend the lens focus completely.
4. Adjust the
Focus
knob
to retract the lens. Watch
the image at the top edge of the screen until it
comes into focus. If the entire screen is in focus,
proceed to step 8.
5. Continue retracting the lens.
a. If the bottom edge of the image comes into focus before the lens
is completely retracted, adjust the vertical boresight bolt to direct
or aim the lens mount UP towards the top of the screen to bal-
ance out the top/bottom edges.
b. If the top edge of the image is not in focus, adjust the vertical
boresight bolt to direct or aim the lens mount toward the bottom
of the screen.
6. When both sides appear equally blurry, adjust the horizontal and/or
vertical offset
to re-center the image on the screen.
7. Repeat Steps 2 - 5 until the top and bottom of the screen are both
well-focused.
8. Re-focus the center of the image. The goal is for good focus at the
center and on all sides.
9. Tighten the vertical hold screw to maintain your adjustments.
10. Check the boresight again.
Focus
Top Center
Focus
Figure 4-5 Focus Top Center of Screen
Adjust
V Boresight
Bolt
Hold
Figure 4-6 Adjust Vertical Bore-
sight Bolt
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