56
HORIZONTAL/VERTICAL IMAGE POSITION, IMAGE AMPLITUDE AND IMAGE DISTORTION ADJUSTMENTS (SDTV OVERSCAN 4:3 MODE)
Note:
• The adjusted data becomes the reference value for the
SDTV underscan 4:3 mode and SDTV overscan/underscan
16:9 modes. When the data is changed, it is required to
re-adjust the underscan data and SDTV overscan/
underscan 16:9 mode data for the same adjustment sig-
nal.
1. Apply the 480/60i 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. Adjust DE04 in the Service Menu to set the vertical position of the
image at the center of the CRT screen.
4. Adjust the horizontal image amplitude with DE02 to match the 95%
line of the size adjustment signal onto the edge of the escutcheon.
5. Apply the 480/60i crosshatch signal to INPUT A.
6. Adjust DE11 to set the sizes of the rectangles at the center of the
image and those at the left and right ends to be identical.
7. Adjust DE12 to set the sizes of the rectangles at the center of the
image and those at the top and bottom to be identical.
8. Ensure that the center position is not deviated. If it is, adjust DE04
again.
9. Adjust DE11, DE12 and DE04 repeatedly until the center position
and vertical linearity are optimized.
10. Adjust DE09 to optimize the trapezoidal distortion (observe the sec-
ond vertical lines from the left and right edges as the reference).
11. Adjust DE08 to optimize the parallelogram distortion (observe the
second vertical lines from the left and right edges as the reference).
12. Adjust DE10 to optimize the horizontal arc distortion.
13. Adjust DE05 so that the second vertical lines from the left and right
edges are linear.
14. If there is an extreme corner S-shape distortion, adjust DE07 to
optimize it (this adjustment is usually unnecessary).
15. If there is an extreme corner W-shape distortion, adjust DE06 to
optimize it (this adjustment is usually unnecessary).
16. Apply the 480/60i size adjustment signal to INPUT A.
17. Observe the vertical amplitude of the image. If it is dislocated, ad-
just DE02 again.
18. Adjust DE03 so that the horizontal position of the image comes at
the center of the CRT screen.
19. Adjust the horizontal image amplitude with DE01 to match the 95%
line of the size adjustment signal onto the edge of the escutcheon.
20. Vary the adjustment signal and adjustment data, and re-perform
adjustments in steps 1 to 19 above (see Table 10).
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]
Make these lines linear.
Escutcheon
Escutcheon
95% line
95% line
Screen size
Adjustment
Adjustment
Adjustment
Step No.
signal
Data
1
480/60i
DE
2
480/60p
DI
3
576/50i
DG
Table 10
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