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1-58 (No. 52152)
HORIZONTAL/VERTICAL IMAGE POSITION, IMAGE AMPLITUDE AND IMAGE DISTORTION ADJUSTMENTS (SDTV UNDERSCAN 4:3 MODE)
Note:
•
Perform the following adjustments after completing
the Reference Mode (SDTV overscan 4:3 mode)
adjustments.
(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) Press the UNDER SCAN button on the front panel to set
the scanning size to underscanning.
(4) Adjust
DF04
in the Service Menu to set the vertical position
of the image at the center of the CRT screen.
(5) Adjust
DF02
to set the vertical amplitude of the image to
233mm
.
(6) Apply the 480/60i crosshatch signal to INPUT A.
(7) Adjust
DF11
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
DF12
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
DF04
again.
(10)Adjust
DF11
,
DF12
and
DF04
repeatedly until the center
position and vertical linearity are optimized.
(11) Adjust
DF09
to optimize the trapezoidal distortion (observe
the second vertical lines from the left and right edges as the
reference).
(12)Adjust
DF08
to optimize the parallelogram distortion (observe
the second vertical lines from the left and right edges as the
reference).
(13)Adjust
DF10
to optimize the horizontal arc distortion.
(14)Adjust
DF05
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
DF07
to optimize it (this adjustment is usually unnecessary).
(16)If there is an extreme corner W-shape distortion, adjust
DF06
to optimize it (this adjustment is usually unnecessary).
(17)Apply the 480/60i size adjustment signal to INPUT A.
(18)Ensure that the vertical amplitude of the image is
233mm
. If
it is not, adjust
DF02
again.
(19)Adjust
DF03
so that the horizontal position of the image
comes at the center of the CRT screen.
(20)Adjust
DF01
to set the horizontal amplitude of the image to
311mm
.
(21)Vary the adjustment signal and adjustment data, and re-
perform adjustments in steps 1 to 20 above (see Table 11).
233mm
311mm
Screen size
Make these lines liner.
Escutcheon
Scanning size (100%)
Adjustment
Adjustment
Adjustment
Step No.
signal
Data
1
480/60i
DF
2
480/60p
DJ
3
576/50i
DH
4
576/50p
DL
Table 11
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]