Sony KP-48V75 Service Manual page 46

GREEN VERTICAL QUATERNARY DISTORTION
ADJUSTMENT
1. Correct the quaternary distortion of the horizontal lines at
the top and bottom sections of the screen with GV 4PIN.
1) Since there is no 4SBOW for vertical correction, there will
be a slight imbalance, but adjust to eliminate the distortion
from the horizontal line at either the top or the bottom of the
screen.
2) In many cases, the horizontal lines at the top and bottom sec-
tions of the screen are not straight lines after the adjustment.
As long as the secondary distortion is mild enough that it can
be corrected with the PIN adjustment, this is OK.
GV 4PIN
GREEN VERTICAL TRAPEZOIDAL DISTORTION
ADJUSTMENT
1. Adjust with GV SSKW so that the tilt of the horizontal lines
at the top and bottom sections of the screen is symmetrical
about the center position horizontal line.
2. Adjust with GV MKEY so that there is no tilt for the line
sections at both sides of the horizontal lines at the center sec-
tion of the stream.
3. Adjust with GV KEY so that there is no tilt for the horizontal
lines at the top and bottom sections of the screen.
4. While tracking, adjust with GV MKEY and GV KEY so that
there is no tilt for the horizontal lines on the entire screen.
5. If the tilt is unbalanced after the GV MKEY and GV KEY
adjustment, adjust again with GV SSKW.
GV SSKW
MKEY
GV SSKW
GV KEY
KEY
GV MKEY
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GREEN VERTICAL ASYMMETRICAL PIN DISTORTION
(SECONDARY DISTORTION) ADJUSTMENT
1. Correct the asymmetrical pin distortion at the top and bot-
tom sections of the screen with RGV SBOW.
GV SBOW
GREEN VERTICAL ASYMMETRICAL PIN DISTORTION
ADJUSTMENT
1. Adjust the pin distortion for both side sections and the center
of the screen with GV MPIN.
2. Adjust with GV PIN so that the horizontal lines at the top
and bottom sections of the screen are straight lines.
3. Adjust with GV MPIN and GV PIN so that there is no curve
in the horizontal lines on the entire screen.
4. After the adjustments in Items 1-3, adjust the tracking with
GV SBOW, GV MPIN, and GV PIN.
MPIN
GV SBOW
GV MPIN
KP-48V75/53V75/61V75
RM-Y903
RM-Y903 RM-Y903
PIN
GV PIN