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Chapter 4—Setup Adjustments
4-14 Hughes-JVC Technology Corporation
Horizontal bowing (vertical centerline off). Use left/right arrow keys to correct.
Vertical bowing (horizontal centerline off). Use up/down arrow keys to correct.
Figure 4.0-5 Bow Distortion
4.3.4. Skew/Rotate (G)
Skew and Rotate are corrected in the same procedure using the same
screen patterns. Skew distortion “leans” horizontally like a trapezoidal
pattern. This means the vertical centerline is skewed in one (1) direction
or another causing the entire pattern to lean in the same direction (see
Figure 4.0-7 on page 4-15). Rotation distortion is where the entire pattern
is rotated vertically or horizontally (refer to Figure 4.0-6 on page 4-15).
Use the Standard Crosshatch test pattern (shown in Figure 4.0-4 on
page 4-13) to spot Skew or Rotation distortion. If the vertical centerline is
vertical and the horizontal centerline is horizontal, the Skew setting is
correct (as described in Section 4.3.7 on page 4-18) and should not be
changed.
Perform the Rotate procedure first to make the horizontal lines horizontal.
If the pattern leans left or right (as illustrated in Figure 4.0-7 on page 4-
15) proceed with the Skew procedure to correct.