JVC DT-V1710CG Service Manual page 57

HORIZONTAL/VERTICAL IMAGE POSITION, IMAGE AMPLITUDE AND IMAGE DISTORTION ADJUSTMENTS (SDTV OVERSCAN 4:3 MODE)
Measuring Instruments
Card (Slot)
Test Points
Adjustment Points
(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 vertical 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 second 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,
adjust 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).
Signal generator (Size adjustment signal, Crosshatch signal)
Component/RGB Input Card (Slot 1)
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]
Escutcheon 95% line
Screen size
Make these lines linear.
Adjustment Adjustment
Step No. signal
1 480/60i
2 480/60p
3 576/50i
4 576/50p
Table 10
95% line
Escutcheon
Adjustment
Data
DE
DI
DG
DK
(No. 52152) 1-57