54
HORIZONTAL/VERTICAL IMAGE POSITION, IMAGE AMPLITUDE AND IMAGE DISTORTION ADJUSTMENTS (HDTV OVERSCAN 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 value of the vertical linearity adjustments.
• The adjusted data becomes the reference value for the
HDTV underscan mode. When the data is changed, it is
required to re-adjust the underscan data for the same
adjustment signal.
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. Adjust DM04 in the Service Menu to set the vertical position of the
image at the center of the CRT screen.
4. Adjust DM02 to set the vertical amplitude of the image to 193mm.
5. Apply the 1080/60i crosshatch signal to INPUT A.
6. Adjust DM11 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 DM12 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 DM04
again.
9. Adjust DM11, DM12 and DM04 repeatedly until the center position
and vertical linearity are optimized.
10. Adjust DM09 to optimize the trapezoidal distortion (observe the sec-
ond vertical lines from the left and right edges as the reference).
11. Adjust DM08 to optimize the parallelogram distortion (observe the
second vertical lines from the left and right edges as the reference).
12. Adjust DM10 to optimize the horizontal arc distortion.
13. Adjust DM05 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 DM07 to
optimize it (this adjustment is usually unnecessary).
15. If there is an extreme corner W-shape distortion, adjust DM06 to
optimize it (this adjustment is usually unnecessary).
16. Apply the 1080/60i size adjustment signal to INPUT A.
17. Ensure that the vertical amplitude of the image is 193mm. If it is
not, adjust DM02 again.
18. Adjust DM03 so that the horizontal position of the image comes at
the center of the CRT screen.
19. Adjust the horizontal image amplitude with DM01 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 8).
SIGNAL DEFLECTION SYSTEM ADJUSTMENTS
193mm
Escutcheon
95% line
Make these lines linear.
Screen size
Adjustment
Adjustment
Adjustment
Step No.
signal
Data
1
1080/60i
DM
2
1080/48i (24pSF)
DS
3
720/60p
DU
Table 8
Summary of Contents for BT-H1700P
Page 5: ......
Page 121: ...Printed in Japan FCD0111BAOK89P E414P E415P ...