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Adjustment items
Focus adjustment
4. B adjustment
1) Set to the B monochrome by lens cap.
2) Receive the image of Retma pattern.
3) Adjust the B electrical focus.
Adjust by focus volume of the focus block (Z410) so that the screen center will
come to optimum focus (point where the brightness gets minimized)
4) Receive the image of crosshatch pattern.
5) Adjust the B lens focus.
Pay attention to the border of the blue line and the black (background) in the vicin-
ity of the screen center.
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.
– 18 –
Adjusting methods
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