Toshiba 43S7DE Service Manual page 18

Adjustment items
Focus adjustment
(Conditions)
• User adjustment :
• To be performed after centering magnet adjustment.
• Signal :
Lens : R .... Internal-house Dot-Cross Pattern (PAL) G
G .... Internal-house Dot-Cross Pattern (PAL)
B .... Internal-house Dot-Cross Pattern (PAL)
Electrical focus : R .... Internal-house Dot-Cross Pattern (PAL)
G .... Internal-house Dot-Cross Pattern (PAL)
B .... Internal-house Dot-Cross Pattern (PAL)
(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 internal-house dot-cross.
3) Adjust the G electric focus.
Adjust the G electrical focus by the focus volume of focus block (Z410) so
that the screen center will come to optimum focus.
(Although the G electrical focus is to be adjusted to allow the scanning
lines in the center of the screen to be seen most clearly, if G alignment
and astigmatism are inferior with the appearance of vertical and horizon-
tal 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 dot-cross 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.
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Adjusting methods
Dynamic mode