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Focus Adjustment (1/2)
Adjustment items
Focus adjustment
Adjustment methods
(Conditions)
- User adjustment: Dynamic mode
- To be performed after centering magnet adjustment.
- Signal:
Lens focus: R ..... Dotcross (PAL)
Electric focus:
(Adjustment)
1. Common item
1) Make coarse adjustments in advance on the lens focus and electrical focus of
each R, G, and B tube.
2. G adjustment
1) Set to the G monochrome by lens cap.
2) Receive the image of crosshatch.
3) Adjust the G electric focus.
Adjust the G electric focus by the focus volume of focus block (Z410) so that the
screen center will come to optimum focus. (Although the G electric focus is to be
adjusted to allow the scanning lines in the center of the screen to be seen most
clealy, if G alignment and astigmatism are inferior with the appearance of verti-
cal and horizontal flares in the center of and around the screen and if the lines
become thicker, adjust to the best point observing the entire screen.)
4) Adjust the G lens focus.
Keep an eye on the center of the crosshatch pattern and adjust so that the
screen center will become clear.
As a rough guide to decrease unevenness, adjust so that red flares on both
sides of the crosshatch line will come to 1mm in thickness.
5) Repeat 3, 4, and attempt to further improve the focus quality.
– 19 –
G ..... Dotcross (PAL)
B ..... Dotcross (PAL)
R ..... Dotcross (PAL)
G ..... Dotcross (PAL)
B ..... Dotcross (PAL)
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