61
HORIZONTAL/VERTICAL IMAGE POSITION, IMAGE AMPLITUDE AND IMAGE DISTORTION ADJUSTMENTS (NTSC/PAL UNDERSCAN 4:3 MODE)
Notes: • Perform the following adjustments after completing the
Reference Mode (NTSL/PAL overscan 4:3 mode) adjust-
ments.
• The data adjusted for the reference mode becomes the
reference value for the NTSC/PAL underscan 4:3 mode
and NTSC/PAL overscan/underscan 16:9 modes. When the
data of the reference mode is changed, it is required to
re-adjust the underscan data and NTSC/PAL overscan/
underscan 16:9 mode data for the same adjustment sig-
nal.
1. Apply the NTSC mono-scope signal to INPUT C (Terminal VIDEO1
on the NTSC/PAL Video 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 DB04 in the Service Menu to set the vertical position of the
image at the center of the CRT screen.
5. Adjust DB02 to set the vertical amplitude of the image to 233mm.
6. Apply the NTSC crosshatch signal to INPUT C.
7. Adjust DB11 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 DB12 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 DB04
again.
10. Adjust DB11, DB12 and DB04 repeatedly until the center position
and vertical linearity are optimized.
11. Adjust DB09 to optimize the trapezoidal distortion (observe the sec-
ond vertical lines from the left and right edges as the reference).
12. Adjust DB08 to optimize the parallelogram distortion (observe the
second vertical lines from the left and right edges as the reference).
13. Adjust DB10 to optimize the horizontal arc distortion.
14. Adjust DB05 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 DB07 to
optimize it (this adjustment is usually unnecessary).
16. If there is an extreme corner W-shape distortion, adjust DB06 to
optimize it (this adjustment is usually unnecessary).
17. Apply the NTSC mono-scope signal to INPUT C.
18. Ensure that the vertical amplitude of the image is 233mm. If it is
not, adjust DB02 again.
19. Adjust DB03 so that the horizontal position of the image comes at
the center of the CRT screen.
20. Adjust DB01 to set the mono-scope signals at 7mm from the es-
cutcheons 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 15).
Measuring Instruments
Signal generator (Mono-scope signal, Crosshatch signal)
Card (Slot)
NTSC/PAL Video Input Card (Slot 2)
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]
Adjustment
Adjustment
Adjustment
Step No.
signal
Data
1
NTSC
DB
2
PAL
DD
Table 15
90
90
80
80
80
7mm
7mm
233mm
90
Make these lines linear.
Scanning size (100%)
Screen size
Summary of Contents for BT-H1700P
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