Bd Input; Digital Convergence - Sony KP-43T70 Training Manual

Overview
The BD Input circuit is used to control the waveforms that will be output by
the BD Output circuit. It also controls the Auto Focus by generating an
OSD signal and receiving the sensor's input while adjusting the conver-
gence data to vary the output waveforms. This circuit determines what
the convergence data was when the optimal signal is received from the
sensors.

Digital Convergence

This set uses Sony's new digital convergence system. This system con-
tains two types of adjustments. They are classified as rough and fine
adjustments. These adjustments are done in the PJED mode of the Ser-
vice Mode. This mode uses a built in pattern generator so the servicer
does not need to carry one.
Rough Adjustments
The rough adjustments are just like some of the adjustments used in the
previous Sony projection sets. It uses the major adjustments in the old
system. The table below shows which adjustments are available for each
color in the rough mode.
SUB DEFLECTION ADJUSTMENT ITEM
Adjustment O : Yes
Display Adjustment item
CENT CENT
SKEW SKEW
SIZE SIZE
LIN LIN
KEY KEY
PIN PIN

BD Input

– : No
Adjustment type
GH GV RH RV BH BV
O O O O O
O – O O O
O O O O O
– – O – O
– – – O –
– O – O –
xxxi
Centering - Changing the centering control causes all of the horizontal
lines to move away from the center at the same rate. It is the first adjust-
ment that should be made when aligning convergence.
Skew – Changing the skew data tilts the picture on its vertical or horizon-
tal axis.
Size - The effect of the horizontal size control is to change the box width
from the center outwards.
Linearity - The linearity control changes the linearity or the width of the
boxes on the left side of center as compared to the right. While changing
the linearity control, if the box width on the right side were getting smaller
the box width on the left side would be getting larger.
Key – The key control is used to adjust keystone distortion. It works by
tilting the left side of the line towards the top while tilting the lines on the
right side towards the bottom.
Pin – The pincushion control is used to adjust pincushion distortion out of
the picture. Pincushion causes the top and bottom of the picture to bow in
opposite directions.
Fine Adjustments
Once you have gotten the best picture you can by using the rough mode,
you can adjust the rest of the picture using the fine mode. When the fine
mode is selected a cursor appears on the screen. This cursor can be
moved to anyone of 81 different points. These points are reached by
moving the cursor in steps around in the vortex pattern shown below. All
the points are at intersections of the horizontal and vertical lines of the
self-generated crosshatch pattern.
O
O
O
–
O
The cursor color can be changed to any of the three colors. When you
O
adjust a point you select the point and the color of the cursor. Then by
using the joystick on the remote you can move the point inside the cursor
up, down, left or right. You repeat this process for all the points that need
to be adjusted.