Deflection System Adjustments; Horizontal/Vertical Image Position/ Amplitude, Distortion Adjustments - JVC DT-V1710CG Service Manual

4.10.10 DEFLECTION SYSTEM ADJUSTMENTS

HORIZONTAL/VERTICAL IMAGE POSITION, IMAGE AMPLITUDE AND IMAGE DISTORTION ADJUSTMENTS (HDTV OVERSCAN MODE)
Measuring Instruments
Card (Slot)
Test Points
Adjustment Points
(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 second 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 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]
Screen size
193mm
Make these lines linear.
Adjustment Adjustment
Step No. signal
1 1080/60i
2 1080/50i
3 1080/24psF
4 720/60p
5 720/50p
Table 8
95% line
Escutcheon
Adjustment
Data
DM
DQ
DS
DU
DW
(No. 52152) 1-55