60
HORIZONTAL/VERTICAL IMAGE POSITION, IMAGE AMPLITUDE AND IMAGE DISTORTION ADJUSTMENTS (NTSC/PAL OVERSCAN 4:3 MODE)
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]
Notes: • Perform the following adjustments after completing the
Reference value for the vertical linearity adjustments.
• The adjusted data becomes the reference value for the
NTSC/PAL underscan 4:3 mode and NTSC/PAL overscan/
underscan 16:9 modes. When the data is changed, it is
required to re-adjust the underscan data and NTSC/PAL
overscan/underscan 16:9 mode data for the same adjust-
ment signal.
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. Adjust DA04 in the Service Menu to set the vertical position of the
image at the center of the CRT screen.
4. Adjust DA02 to match the 95% line of the vertical image amplitude
onto the edge of the escutcheon.
5. Apply the NTSC crosshatch signal to INPUT C.
6. Adjust DA11 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 DA12 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 DA04
again.
9. Adjust DA11, DA12 and DA04 repeatedly until the center position
and vertical linearity are optimized.
10. Adjust DA09 to optimize the trapezoidal distortion (observe the sec-
ond vertical lines from the left and right edges as the reference).
11. Adjust DA08 to optimize the parallelogram distortion (observe the
second vertical lines from the left and right edges as the reference).
12. Adjust DA10 to optimize the horizontal arc distortion.
13. Adjust DA05 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 DA07 to
optimize it (this adjustment is usually unnecessary).
15. If there is an extreme corner W-shape distortion, adjust DA06 to
optimize it (this adjustment is usually unnecessary).
16. Apply the NTSC mono-scope signal to INPUT C.
17. Observe the vertical amplitude of the image. If it is dislocated, ad-
just DA02 again.
18. Adjust DA03 so that the horizontal position of the image comes at
the center of the CRT screen.
19. Adjust DA01 to match the 95% line of the vertical the image ampli-
tude 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 14).
90
90
90
80
80
80
Make these lines linear.
Escutcheon
Escutcheon
95% line
95% line
Screen size
Adjustment
Adjustment
Adjustment
Step No.
signal
Data
1
NTSC
DA
2
PAL
DC
Table 14
Summary of Contents for BT-H1700P
Page 5: ......
Page 121: ...Printed in Japan FCD0111BAOK89P E414P E415P ...