JVC DT-V1710CG Service Manual page 60

VERTICAL IMAGE POSITION, IMAGE AMPLITUDE AND IMAGE DISTORTION ADJUSTMENTS (SDTV UNDERSCAN 16:9 MODE)
Measuring Instruments
Card (Slot)
Test Points
Adjustment Points
Notes:
•
Perform the following adjustments after completing the Reference Mode (SDTV overscan 4:3 mode) and SDTV underscan
4:3 mode adjustments.
•
The corner distortions (W) & (S), parallelogram distortion, trapezoidal distortion and horizontal arc distortion adjustment
data for this adjustment are common to those in the SDTV overscan 16:9 mode and the SDTV underscan 16:9 mode
adjustments. This adjustment data needs to be adjusted in either mode.
•
The corner distortions (W) & (S), parallelogram distortion, trapezoidal distortion and horizontal arc distortion adjustment
data for this adjustment are common to those in the 480/60i and NTSC signal or 576/50i and PAL signal adjustments.
This adjustment data needs to be adjusted with either signal.
(1) Apply the 480/60i size adjustment signal to INPUT A
(Terminal Y on the Component/RGB Input Card).
(2) Press the ASPECT and UNDER SCAN buttons on the front
panel to set the scanning size to underscanning for the 16:9
ratio.
(3) Set the CONTRAST and BRIGHT potentiometers on the
front panel to the center click positions.
(4) Adjust DY17 in the Service Menu to set the vertical position
of the image at the center of the CRT screen.
(5) Adjust DY16 to set the vertical amplitude of the image to
175mm.
(6) Apply the 480/60i crosshatch signal to INPUT A.
(7) Adjust CE08 to optimize the trapezoidal distortion (observe
the second vertical lines from the left and right edges as the
reference).
(8) Adjust CE07 to optimize the parallelogram distortion (observe
the second vertical lines from the left and right edges as the
reference).
(9) Adjust CE09 to optimize the horizontal arc distortion.
(10) Adjust DY18 so that the second vertical lines from the left
and right edges are linear.
(11) If there is an extreme corner S-shape distortion, adjust CE06
to optimize it (this adjustment is usually unnecessary).
(12) If there is an extreme corner W-shape distortion, adjust CE05
to optimize it (this adjustment is usually unnecessary).
(13) Apply the 480/60i size adjustment signal to INPUT A.
(14) Ensure that the vertical amplitude of the image is 175mm. If
it is not, adjust DY16 again.
(15) Adjust DY17 so that the vertical position of the image comes
at the center of the CRT screen.
(16) Vary the adjustment signal and adjustment data, and re-
perform adjustments in steps 1 to 15 above (see Table 13).
Adjustment Adjustment
Step No. Signal
1 480/60i
2 480/60p
3 576/50i
4 576/50p
1-60 (No. 52152)
Signal generator (Size adjustment signal, Crosshatch signal)
Component/RGB Input Card (Slot 1)
DY** (Vertical Size), DY** (Vertical Position), DY** (Side Pin Distortion), CE** (Corner Distortion
(W)), CE** (Corner Distortion (S)), CE** (Parallelogram Distortion), CE** (Trapezoidal Distortion),
CE** (Horizontal Arc Distortion) [Service Menu]
Vertical Vertical Side Pin
Position size Distortion Distortion (W) Distortion (S)
DY17 DY16
DY29 DY28
DY23 DY22
DY35 DY34
Adjustment Data
Corner Corner
DY18 CE05 CE06
DY30 CE15 CE16
DY24 CE10 CE11
DY36 CE20 CE21
Table 13
Scanning size (100%)
175mm
Screen size
Make these lines linear.
Parallelogram Trapezoidal
Distortion Distortion
CE07 CE08
CE17 CE18
CE12 CE13
CE22 CE23
Horizontal
Arc Distortion
CE09
CE19
CE14
CE24