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Focus Adjustment (2/2)
Adjustment items
Focus adjustment
3. R adjustment
1) Set to the R monochrome by lens cap.
2) Receive the image of the crosshatched pattern.
3) Adjust the R electric focus.
Adjust by focus volume of the focus block (Z410) so that the screen center will
come to optimum focus.
4) Adjust the R lens focus.
Adjust so that the screen center will become the best.
5) Repeat 3, 4, and attempt to further improve the focus quality.
4. B adjustment
1) Set to the B monochrome by lens cap.
2) Receive the image of the crosshatch pattern.
3) Adjust the B electric focus.
Adjust the B electric focus by using the focus
VR on the focus block (Z410) so that the scanning line is the most distinct at the
point of 2/3L left side from the screen center.
At this time, the focus volume should be adjusted by turning the focus VR slightly
right after finding the best focus point, then turning left and stopping at the best
focus point.
4) Adjust the B lens focus.
Pay attention to the vicinity of the screen center of the crosshatch.
First of all, make coarse adjustments of the lens, and move the lens adjusting
screw to the right at the point being considered as the best focus. Then, the lines
of the border become clear. Check and confirm under the circumstance that a
flare appears. On the contrary, if the lens adjusting screw is moved to the left
from the situation, the flare will disappear, and at this point you will find a point
from which the borderline itself begins to go out of focus. Adjust to the very point
where the focus begins to go out.
– 20 –
Adjustment methods
2/3L
L
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