ELE-52
VERTICAL IMAGE POSITION, IMAGE AMPLITUDE AND IMAGE DISTORTION ADJUSTMENTS (NTSC/PAL UNDERSCAN 16:9 MODE)
Measuring Instruments
Signal generator (Mono-scope signal, Crosshatch signal)
Card (Slot)
NTSC/PAL Video Input Card (Slot 2)
Test Points
Adjustment Points
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]
(1) Apply the NTSC mono-scope signal to INPUT C (Terminal
VIDEO1 on the NTSC/PAL Video 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
DY05
in the Service Menu to set the vertical position
of the image at the center of the CRT screen.
(5) Adjust
DY04
to set the vertical amplitude of the image to
175mm
.
(6) Apply the NTSC crosshatch signal to INPUT C.
(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
DY06
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 NTSC mono-scope signal to INPUT C.
(14) Ensure that the vertical amplitude of the image is
175mm
. If
it is not, adjust
DY04
again.
(15) Adjust
DY05
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 17 ).
90
90
80
80
80
175mm
90
Make these lines linear.
Scanning size (100%)
Screen size
Adjustment
Adjustment
Adjustment Data
Step No.
Signal
Vertical
Vertical
Side Pin
Corner
Corner
Parallelogram Trapezoidal
Horizontal
Position
size
Distortion
Distortion (W) Distortion (S)
Distortion
Distortion
Arc Distortion
1
NTSC
DY05
DY04
DY06
CE05
CE06
CE07
CE08
CE09
2
PAL
DY11
DY10
DY12
CE10
CE11
CE12
CE13
CE14
Table 17
Notes:
•
Perform the following adjustments after completing the Reference Mode (NTSL/PAL overscan 4:3 mode) and NTSC/
PAL 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 NTSC/PAL overscan 16:9 mode and the NTSC/PAL 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.
Summary of Contents for BT-H1700BMC
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