Sony KP-51DS1U Service Manual page 44

KP-51DS1U
RM-892
GREEN VERTICAL 4TH ORDER DISTORTION
ADJUSTMENT
1. Receive the Internal pattern (crosshatch) signal.
2. By using GV 4PIN, 4th-Order distortion of the horizontal
lines at the top & bottom can be corrected.
Since there is no 4SBO for vertical correction, there will be a
slight imbalance, but adjust the registration to eliminate any
distortion.
GV 4PIN
GREEN VERTICAL TRAPEZOIDAL DISTORTION
ADJUSTMENT
1. Receive the Internal pattern (crosshatch) signal.
2. Adjust GV SSKW so that the tilt of the horizontal lines at the
top and bottom of the screen are symmetrical.
3. Adjust GV MKEY so that there is no tilt for the middle sec-
tion.
4. Adjust GV KEY so that there is no tilt at the top and bottom
of the screen.
5. While tracking adjust GV MKEY and GV KEY, so that there
is no tilt over the entire screen.
6. If the tilt is unbalanced after GV MKEY and GV KEY
have been adjusted, readjust GV SSKW.
GV SSKW
MKEY
GV KEY
KEY
GV SSKW
GV MKEY
GREEN VERTICAL ASYMMETRICAL PIN DISTORTION
(2ND-ORDER DISTORTION) ADJUSTMENT
1. Receive the Internal pattern (crosshatch) signal.
2. Correct the asymmetrical pin distortion at the top and bot-
tom of the screen with GV SBOW.
GV SBOW
GREEN VERTICAL ASYMMETRICAL PIN DISTORTION
ADJUSTMENT
1. Receive the Internal pattern (crosshatch) signal.
2. Using GV MPIN adjust the pin distortion at both edges of
the screen and at the centre.
3. Using GV PIN, adjust, so that the horizontal lines at the top
& bottom of the screen are straight lines.
4. Adjust GV MPIN & GV PIN so that there is no curve in the
horizontal lines on the entire screen.
5. After adjusting the items above, using tracking with GV
SBOW. GV MPIN, and GV PIN to correct the entire screen.
MPIN
GV MPIN
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PIN
GV SBOW
GV PIN