55
Adjustment
Adjustment
Adjustment
Step No.
signal
Data
1
1080/60i
DN
2
1080/48i (24pSF)
DT
3
720/60p
DV
HORIZONTAL/VERTICAL IMAGE POSITION, IMAGE AMPLITUDE AND IMAGE DISTORTION ADJUSTMENTS (HDTV UNDERSCAN MODE)
Measuring Instruments
Signal generator (Size adjustment signal, Crosshatch signal)
Card (Slot)
Component/RGB Input Card (Slot 1)
Test Points
Adjustment Points
D*01 (Horizontal Size), D*02 (Vertical Size), D*03 (Horizontal Position), D*04 (Vertical Position), D*05 (Side
Pin Distortion), D*06 (Corner Distortion (W)), D*07 (Corner Distortion (S)), D*08 (Parallelogram Distortion),
D*09 (Trapezoidal Distortion), D*10 (Horizontal Arc Distortion), D*11 (Vertical Linearity (S Correction)), D*12
(Vertical Linearity (C Correction)) [Service Menu]
Notes: • Perform the following adjustments after completing the
Reference Mode (HDTV overscan mode) adjustments.
• The data adjusted for the reference mode becomes the
reference value for the HDTV underscan mode. When the
data of the reference mode is changed, it is required to
re-adjust the underscan data for the same adjustment sig-
nal.
1. Apply the 1080/60i size adjustment signal to INPUT A (Terminal Y
on the Component/RGB Input Card).
2. Set the CONTRAST and BRIGHT potentiometers on the front panel
to the center click positions.
3. Press the UNDER SCAN button on the front panel to set the scan-
ning size to underscanning.
4. Adjust DN04 in the Service Menu to set the vertical position of the
image at the center of the CRT screen.
5. Adjust DN02 to set the vertical amplitude of the image to 175mm.
6. Apply the 1080/60i crosshatch signal to INPUT A.
7. Adjust DN11 to set the sizes of the rectangles at the center of the
image and those at the left and right ends to be identical.
8. Adjust DN12 to set the sizes of the rectangles at the center of the
image and those at the top and bottom to be identical.
9. Ensure that the center position is not deviated. If it is, adjust DN04
again.
10. Adjust DN11, DN12 and DN04 repeatedly until the center position
and vertical linearity are optimized.
11. Adjust DN09 to optimize the trapezoidal distortion (observe the sec-
ond vertical lines from the left and right edges as the reference).
12. Adjust DN08 to optimize the parallelogram distortion (observe the
second vertical lines from the left and right edges as the reference).
13. Adjust DN10 to optimize the horizontal arc distortion.
14. Adjust DN05 so that the second vertical lines from the left and right
edges are linear.
15. If there is an extreme corner S-shape distortion, adjust DN07 to
optimize it (this adjustment is usually unnecessary).
16. If there is an extreme corner W-shape distortion, adjust DN06 to
optimize it (this adjustment is usually unnecessary).
17. Apply the 1080/60i size adjustment signal to INPUT A.
18. Ensure that the vertical amplitude of the image is 175mm. If it is
not, adjust DN02 again.
19. Adjust DN03 so that the horizontal position of the image comes at
the center of the CRT screen.
20. Adjust DN01 to set the size adjustment signals at 7mm from the
escutcheons on the left and right side of the image.
21. Vary the adjustment signal and adjustment data, and re-perform
adjustments in steps 1 to 20 above (see Table 9).
175mm
7mm
Make these lines linear.
Escutcheon
Scanning size (100%)
Screen size
Table 9
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